Ethereum jobs

...verified. • Administrators: role-based panel to inspect deeds, titles, permits, then press a single “verify” action that triggers smart-contract interaction and permanently records the proof. Technical expectations • Modern stack—React or similar front end, Node/TypeScript or comparable back end, Solidity (or Rust) smart contract, IPFS/S3 for file storage, and a mainstream chain such as Ethereum or Polygon. • Secure authentication, GDPR-compliant data handling, and audit logging baked in from day one. • Clean API so mobile apps can be added later, plus automated tests and CI/CD pipeline. Deliverables 1. Functional web application with separate owner, buyer, and admin roles. 2. Smart contract(s) with source, migration scripts...

...Hash). Confirm availability to complete within 5 days. Reality Check: This is a $175 grant for a research-grade MVP phase only. Deliverable is an auditable prototype with documented attack surface, not a production-ready system. Ready to build sovereignty-enforcing smart contracts on Proof-of-Work? Apply now. More information about the above project: EVM Chains with Atomic Swap Implementations: Ethereum: HTLC contracts, AirSwap, CometSwap Polygon: ZK-enabled atomic swaps Arbitrum/Optimism: Via DEX aggregators and cross-chain bridges Avalanche C-Chain: Native HTLC support Binance Smart Chain: Multiple atomic swap protocols Fantom, Cronos, Base: All support standard HTLC contracts Key Distinction for Sovereign V2: While atomic swaps are common, your spec adds unique layers: ZK...

...did for privacy and what Bitcoin Cash sought for utility, but at a "Groundfloor" level on a Sovereign EVM. As a lead architect, you will not just be coding; you will be officially improving the Bitnet Money blockchain's privacy infrastructure, establishing a reference standard for trustless OTC exchange before the ecosystem scales. Introduction: Polygon proved that you could take the standard Ethereum Virtual Machine and wrap it in a zero-knowledge proof layer to achieve instruction-level compatibility with cryptographic finality. By referencing their success, we ground this project in proven computer science while applying it to a unique Proof of Work environment. Launched in 2023, this Sovereign PoW ecosystem requires a high-security, non-custodial environment f...

...productionize the entire system. Platform & Tech Stack Mobile App Android Kotlin Android Studio MVVM Architecture Material Design UI Blockchain Integration Ethereum Binance Smart Chain (BSC) Polygon Bitcoin APIs CoinGecko CoinMarketCap Backend Node.js + Express or Laravel (PHP) Database MySQL or MongoDB Core Wallet Features Required The wallet must function as a complete crypto wallet application. Wallet Management Create new wallet Import wallet via: Seed phrase Private key Secure seed phrase storage AES encrypted wallet data Transactions Send crypto Receive crypto QR code wallet address QR scanner Transaction history Multi-Chain Support Must support: Ethereum network Binance Smart Chain Polygon Bitcoin Token Support Import custom tokens Automatic token detection Toke...

...governance proposals in that quarter. Turnout_Avg Average voter participation in governance proposals (if available). Active_Quarter_Dummy Dummy variable equal to 1 if governance proposals occurred in that quarter. BLOCK D — Control Variables Token_Return Return of the DAO governance token during the quarter. Market_Return Return of the overall crypto market during the quarter (Bitcoin or Ethereum benchmark). Data Sources Reliable sources may include: DeepDAO Dune Analytics DefiLlama Messari Snapshot governance data DAO governance dashboards or official documentation Output Format The dataset should be delivered as an Excel or CSV file. Each row must represent one DAO observation per quarter. Example structure: DAO_ID | Year | Quarter | Treasury_USD | NativeTok...

I am looking for a developer to build a simple web-based cryptocurrency transaction tracker that allows users to check recent transactions of a cryptocurrency wallet address. The application should focus on tracking transactions for Bitcoin by using a public blockchain API. The goal of this project is to create a lightweight web tool where users can enter a Bitcoin wallet address and view recent transaction activity in an organized dashboard. The system should connect to a reliable public blockchain API service such as Blockchain or BlockCypher to retrieve transaction data. When a user enters a wallet address, the system should fetch the latest transaction details and store them in a MySQL database. The application should then display the retrieved information in a simple and readable for...

...and I’m starting from a beginner’s standpoint in technical analysis. I can read basic candlestick charts but that’s where my confidence ends. I need a seasoned trader who can walk me through the core concepts of technical analysis—interpreting price action, spotting reliable patterns, and understanding indicators such as moving averages, RSI, MACD, and Fibonacci levels in the context of Bitcoin, Ethereum, and the major alt pairs I follow on Binance and Bybit. My goal is to progress from theory to practical application, so live screen-share sessions on TradingView (or a comparable charting platform you prefer) are essential. I’d like you to demonstrate how you build a trade thesis, set entries and exits, size positions, and manage risk in real time. ...

...Subscriptions must be processed using: CCBill Plans supported: VIP Plan Premium Plan These subscriptions must support automatic recurring payments. Wallet Recharge Payments Users must be able to recharge their wallet balance using: PayPal Coinbase Commerce (crypto payments) Example recharge amounts: 10 € 20 € 50 € Crypto Payments Crypto payments using Coinbase Commerce must support: Bitcoin Ethereum USDT Litecoin Crypto can be used for: wallet recharge optional subscription payments. Wallet System Each user must have an internal wallet. Wallet functions: store balance purchase private content unlock media. Micro-Payments Example pricing: Private photo → 0.50 € Private video → 1 € Photo pack → 3 € Premium vi...

...and further developed. ________________________________________ Platforms We Are Interested In We are open to reviewing solutions such as: • Crypto wallet tracking tools • On-chain analytics dashboards • Smart money tracking platforms • DEX trading analytics dashboards • Crypto signals dashboards • Token analytics platforms • Blockchain monitoring tools Platforms connected to chains such as: • Ethereum • Solana • Base • Arbitrum are especially interesting. ________________________________________ Key Features We Are Looking For Ideally the platform should already include some of the following: • Blockchain wallet tracking • Transaction history parsing • Token analytics • Profit and loss tracking • On-...

I need a full-featured crypto casino built from the ground up with a modern and sleek interface. The core of the platform must include slot machines, poker and blackjack that run smoothly on desktop and mobile, with provably-fair logic and real-time game analytics. All monetary flows should be on-chain. Players must be able to deposit, wager and withdraw in Bitcoin, Ethereum and Litecoin, with automatic rate conversion and transparent transaction histories. A secure wallet system, KYC hooks and anti-fraud measures have to be in place from day one. The UI should feel crisp, animated and intuitive—think dark mode by default, lightweight micro-interactions and fast page transitions, all responsive down to phone portrait. I will provide brand colours and typography; you handle F...

I need a seasoned blockchain developer to create a full-featured NFT marketplace that runs on Ethereum, Binance Smart Chain, and Polygon. The core flow is straightforward: mint, list, buy, or sell NFTs across the supported chains without leaving the platform. What I expect: • Smart contracts for minting and trading on each network, written in Solidity (or the most efficient language for that chain) and fully verified. • A web interface where users can:  – Create an account via email/password,  – Connect their preferred wallet when they’re ready to transact,  – Mint new NFTs with custom metadata,  – Instantly list or purchase items at fixed price. • Clean, well-documented code plus a brief deployment guid...

I’m ready to acquire a turnkey web3 social marketplace built for Ethereum. The single-most important piece for me is a robust social layer: users need to create profiles, follow one another, post content, react, and see everything update in real time. If you already have a codebase that does this—or can deliver it fast—I’d like to review it. All on-chain actions (profile creation, posts, reactions, reputation points, etc.) should settle on Ethereum using well-known ERC-20/721/1155 patterns so ownership is clear and portable. Wallet-based sign-in through MetaMask or WalletConnect must be smooth and gas usage optimised. Peer-to-peer trading or full decentralised identity can stay modular for later; my immediate focus is a polished, scalable social expe...

I’m ready to wrap up the next milestone of my app by completing the payment feature. The focus is clear: • Finish the Payment Integration module with Cryptocurrency support. • Connect to a reputable crypto gateway or direct wallet API so users can pay seamlessly. • Handle transaction creation, con...callbacks, and error states. • Implement secure key storage and basic fraud-prevention checks. • Provide environment-specific configs (testnet and mainnet) along with concise setup docs. I’ll review the work against functional tests that prove a user can initiate, confirm, and see their crypto payment reflected in the app’s order status screen. If you have recent experience integrating Bitcoin, Ethereum, or similar coins using common libraries...

I need an experienced Solidity developer to design, test, and deploy production-ready smart contracts on the Ethereum mainnet. The core requirement is clean, secure contract logic that follows current best practices and is ready for public verification on Etherscan. Your work will cover the full contract lifecycle: architecture discussion with me, coding in Solidity, unit testing with Hardhat or Truffle, gas optimisation, and final deployment through a verified address. Clear, commented code and a brief deployment guide are essential so the contracts can be maintained or upgraded later without confusion. Deliverables: • Audited, optimised Solidity source files • Comprehensive unit tests with passing results • Deployment scripts and step-by-step instructions &b...

...blockchain, DeFi, NFTs, and Web3 Cover breaking news and trending topics in the crypto space Conduct research and verify information from reliable sources Produce opinion pieces, explainers, and long-form analysis Maintain a consistent publishing schedule Optimize content for SEO Requirements Proven experience writing about / blockchain Strong understanding of: Bitcoin & Ethereum ecosystems DeFi protocols Layer 2 solutions Tokenomics Market analysis Ability to explain technical topics clearly Excellent English writing skills Fast turnaround time for news-based content Familiarity with SEO best practices Nice to Have Journalism background Experience working with crypto media outlets Understanding of on-cha...

More details: What type of wallets does the drainer need to support? Cryptocurrency wallets Which cryptocurrency wallets do you need the drainer to work with? Bitcoin wallets, Ethereum wallets, Multiple cryptocurrency wallets What functionalities do you need in the wallet drainer? Fund transfer

I’m launching a decentralized investment platform on Ethereum where users purchase one of five licences that immediately spin up an autonomous AI-powered trading agent. The agent trades their locked capital for 90 days, credits daily profit on-chain, and makes those profits withdrawable at any moment while the principal remains locked. All portfolio data, trade history and licence status must be visible in real-time through a clean, minimalistic dashboard with licence management at its core. What I need built: • Solidity smart-contracts that mint and manage the five licence types, lock user capital, distribute daily profit, and expose transparent on-chain metrics. • A lightweight Web3 front-end (React, or similar) that follows a minimalistic design language yet ...

I want to launch a web-based platform that applies artificial intelligence to cryptocurrency analysis, delivering clear, real-time insights for Bitcoin, Ethereum and Ripple. The core of the job is to build three complementary analytics engines—technical, fundamental and sentiment—and surface their combined signals through a clean dashboard and API. Here is what I need from you: • Technical analysis module that streams market data, runs indicator-based models and highlights trends or break-outs. • Fundamental analysis module that ingests on-chain metrics, macro news, project updates and scores long-term value. • Sentiment analysis module that mines social channels, news headlines and forums to gauge crowd mood. • Unified scoring layer so users...

...patients). Implement authentication using a smart contract on a blockchain network. Store authentication hashes or validation logs on blockchain (no medical data on-chain). Store medical records exclusively in Microsoft SQL Server. Validate authentication via blockchain before granting access to SQL Server. Log authentication events for traceability. Technical Requirements Blockchain platform (Ethereum or similar test network) Smart contract implementation Backend (Node.js or Python preferred) Microsoft SQL Server integration Clear architecture diagram Documentation explaining authentication flow and integration strategy Deliverables Full source code Functional smart contract SQL Server database schema Architecture diagram Installation guide Technical documenta...

...(e.g., sell before expiry or if loss >10%). Basic interface: A Python or JS script that runs on cloud (AWS or similar), with logs in Telegram or email for notifications. Security: Use environment variables for keys, no hardcoding. Testing: Backtesting with historical data and dry-run before live. Required skills: Programming in Python (preferred) or JavaScript/Node.js. Blockchain experience (Ethereum/Polygon, or ). APIs and trading bots (e.g., Polymarket SDK, websockets for realtime). Knowledge of crypto and prediction markets (Polymarket specific is a plus). Cloud deployment (AWS, Heroku or similar for 24/7). Looking forward to serious proposals In addition to the payment for the development work, the selected programmer will receive a stake in the funded account generat...

...minimum viable product therefore revolves around three pillars: 1. Real-time market data – tight latency on price feeds, order book depth and recent trades is essential. Whether you hook into existing exchange APIs, aggregate several sources, or build your own feed handler, the ticker and order book must update instantly without page refreshes. 2. Multi-currency support – at launch I want Bitcoin, Ethereum and at least three additional top-tier coins live, with the system architected so that adding new pairs later is straightforward. 3. Seamless order execution – limit, market and stop-limit orders with immediate feedback on fill status. A matching engine of your own design or a proven open-source core is fine as long as it can scale and pass a basic stress t...

...blockchain, DeFi, NFTs, and Web3 Cover breaking news and trending topics in the crypto space Conduct research and verify information from reliable sources Produce opinion pieces, explainers, and long-form analysis Maintain a consistent publishing schedule Optimize content for SEO Requirements Proven experience writing about / blockchain Strong understanding of: Bitcoin & Ethereum ecosystems DeFi protocols Layer 2 solutions Tokenomics Market analysis Ability to explain technical topics clearly Excellent English writing skills Fast turnaround time for news-based content Familiarity with SEO best practices Nice to Have Journalism background Experience working with crypto media outlets Understanding of on-cha...

... OKX Oracles: Pyth Network, CoinGecko (free tier), Chainlink feeds if accessible DEX/Aggregators: Uniswap (via DexScreener or subgraph), DeFi Llama API Bridge/Wrapped Tokens: WBTC (Ethereum), cbBTC (Base), BTC.b (Avalanche), tBTC, etc. — fetch via DeFi Llama or direct contract reads if possible Price Deviation & Latency Scanner Calculate percentage spreads/deviations between every pair of sources Measure and display API response latency for each source Highlight anomalies (e.g., >0.5% spread, high latency spikes) Pairwise comparison matrix/table (spread %, direction, suggested action like "Buy WBTC on Ethereum") Live Dashboard UI Modern, responsive, dark/light mode support (Tailwind CSS or similar preferred) Sections: CEX Prices, Oracle Prices, DE...

.../leaderboard Top 10 ranked by Views or Earnings Admin configurable ranking method /campaigns Lists all active campaigns. /earnings Shows: Pending earnings Eligible earnings Paid earnings 8. USDT Wallet Collection (Manual Payout Only) The bot does NOT need to track blockchain payments. It only needs to store wallet addresses. Command /add-usdt <wallet_address> Requirements Validate Ethereum format: Starts with 0x 42 characters Allow users to update anytime Store wallet address linked to Discord ID Confirm: “USDT wallet saved successfully.” Admin Access Admin must be able to: View wallet of a user Export wallets in Excel Export must include: Username Discord ID Total Earnings Wallet Address Payments will be handled manually outside t...

I’m planning to launch a new blockchain-based product and I need an experienced developer who can guide me from concept to main-net deployment. At this stage I’m flexible about the exact stack—Ethereum, Binance Smart Chain, Solana or another network—so I value someone who can weigh the trade-offs and recommend the best fit for scalability, fees, security, and time-to-market. The broad vision includes designing the core smart contracts, creating a native token, integrating a secure wallet flow, and building out any web or mobile front-end required for users to interact with the chain. I also want clear documentation and the test coverage needed for a smooth audit. Deliverables I’d like to see: • Technical roadmap outlining the chosen architecture,...

I already have a draft smart contract, but it needs a careful review and a few modifications before going live. Once the code is solid, I want it deployed on Ethereum (that is my first choice, though I’m open to discussing BSC or Polygon if you feel they offer clear advantages). After deployment, the contract must be fully integrated into my website so users can interact with it through MetaMask. A smooth, reliable Web3 flow is essential—wallet connection, transaction signing, on-chain confirmations, and any UI feedback should feel seamless and secure. The job breaks down into three main parts: • Audit, adjust, and finalise the existing contract code, then compile, test, and verify it on the chosen network. • Deploy the verified contract and wire it up t...

I need a brand-new ERC-20 smart contract built from scratch, then deployed to the Ethereum network. The token must include minting, burning, and pausable functionality, implemented with clean, upgrade-friendly Solidity code that follows current best practices (OpenZeppelin libraries, Hardhat or Foundry for testing). Please create, test, and deploy the contract, then hand over everything required for future maintenance. Deliverables • Verified Solidity source code with mint, burn, and pause modules • Full test suite covering core logic and edge cases • Deployment scripts and step-by-step notes (addresses, gas used, etherscan verification) • Final token address on Ethereum mainnet or a clearly documented test deployment if mainnet is postponed Accep...

I am in the middle of financial-remedy proceedings and have been appointed to instruct a single joint expert. My ex-partner has disclosed a series of public keys and wallet addresses; however, I still need a clear, defensible picture of exactly how much cryptocurrency he currently holds and through how many wallets. The work centres on three core blockchains—Bitcoin, Ethereum and Ripple—but there may be additional tokens mixed in, so flexibility to widen the net is essential. I can supply every public key and wallet address already disclosed, and I can request anything else you identify as relevant. Your task is to trace those identifiers on-chain, calculate the present balances, and compile a concise report that can stand up to court scrutiny. Chain-analysis platform...

...Complete source code with clear installation/compilation instructions • Brief technical documentation outlining architecture, key-management method, and backup/restore logic • A short demo video or walkthrough proving send/receive, history display, and backup/restore work on mainnet or testnet Acceptance criteria • Wallet sends and receives transactions successfully on at least one EVM chain (Ethereum testnet is fine). • Transaction history populates within 10 sec of login on a typical 4G connection. • Backup restores the identical account and transaction list on a fresh install without data loss. • Code passes basic static analysis (no hard-coded private keys, secrets, or fatal vulnerabilities). Once these points are met, I’m rea...

...I do know is that the end product will rely on smart contracts, a dApp front end, and secure wallet interaction, so familiarity with Solidity or similar contract languages, , and modern front-end frameworks is essential. Here’s how I’d like to structure our collaboration: – First, a short technical workshop where you assess my concept, recommend an appropriate blockchain (Ethereum, BSC, Polkadot, or another you feel fits), outline the contract architecture, and flag any compliance or security considerations. – Once we lock the specs, you’ll build the smart contracts, write thorough unit and integration tests, and deploy to a testnet. – Finally, we’ll connect the contracts to a simple but polished front end, run a security review,...

...straightforward: a student signs up, uploads a certificate, and immediately receives an on-chain validation record that anyone can later cross-check online. I have half work done and pages are created Core functionality • Secure user registration and login with email or social auth • Certificate upload, automatic hashing, and immutably storing the hash on a blockchain network (Ethereum or any suitable L2 you recommend) • Instant on-screen validation result plus a shareable verification link • Admin dashboard where I can review submissions, view analytics, and revoke or re-issue hashes when needed Tech notes I’m open to React, , or similar for the front-end, and Node.js, Python (FastAPI), or comparable for the back-end. What matters most is ...

I want to launch a simple USDT Stable Coin and I want it live on any of the three major networks: BEP20 (Binance Smart Chain), ERC20 (Ethereum), and TRC20 (Tron). The token only needs the core Tether behaviour—holders must be able to transfer tokens and see their main & asset balance with standard calls, original Logo. If you already have experience shipping tokens on any of these networks and can complete the third quickly, let me know—speed and reliability matter more than extra features.

...straightforward: a student signs up, uploads a certificate, and immediately receives an on-chain validation record that anyone can later cross-check online. I have half work done and pages are created Core functionality • Secure user registration and login with email or social auth • Certificate upload, automatic hashing, and immutably storing the hash on a blockchain network (Ethereum or any suitable L2 you recommend) • Instant on-screen validation result plus a shareable verification link • Admin dashboard where I can review submissions, view analytics, and revoke or re-issue hashes when needed Tech notes I’m open to React, , or similar for the front-end, and Node.js, Python (FastAPI), or comparable for the back-end. What matters most is ...

I’m putting together a consumer-to-business payment gateway that runs entirely on Ethereum. The goal is for any online shop or SaaS platform to accept on-chain payments in ETH or ERC-20 tokens and receive instant confirmation through a simple API or Web3 hook, with built-in fraud checks before funds reach the merchant. Here’s the flow I have in mind: a shopper clicks “Pay with Crypto,” the gateway spins up a one-time smart-contract address, watches the chain for the deposit, runs fraud-detection logic (velocity limits, address reputation, basic AML heuristics), and then notifies the merchant’s backend via webhook or GraphQL subscription. Successful transactions should settle directly to the merchant’s wallet; failed or flagged payments must trigg...

I am building a service that must accept one-time customer payments directly on a public blockchain. My preferred rail is Ethereum, so the core of the job is a production-ready smart-contract–plus–API stack that lets me generate unique payment addresses, confirm the transfer, and surface the confirmation back to my app in real time. Here’s what I need the finished package to do: • Solidity smart contract deployed on Ethereum mainnet (initially Kovan/Goerli for testing) that logs each payment, enforces one-time use, and emits an event my backend can listen to. • Lightweight Web3 interface or RESTful webhook that notifies my server once a transaction reaches a configurable confirmation depth. • Simple front-end snippet (HTML/JS) that shows ...

...monitor USDT on Ethereum. The core of the job is to stand up a private Ethereum node (Geth, Erigon, or another production-grade client you recommend), then layer on the components below: • Wallet creation & management ‑ Generate unlimited ERC-20-compatible addresses locally. ‑ Store keys only on my server; nothing ever leaves it. ‑ Simple CLI or lightweight web panel is fine as long as it’s secure and documented. • Transaction tracking ‑ Real-time detection of incoming USDT transfers to any generated address. ‑ Callback or webhook that posts the transaction hash, amount, sender, and block confirmation count. ‑ Dashboard or log view so I can audit activity at a glance. No exchange or cross-chain connections are needed; everythi...

I need Google Analytics 4 to register every meaningful moment a visitor interacts with our Ethereum-based wallet integration. The scope covers: • Wallet connections – I want separate events when a user connects successfully and when the attempt fails. • Transaction completions – log both payment-success and payment-failed states. • General wallet errors – surface any other connectivity issues as a distinct event so they do not disappear inside generic JavaScript error noise. You may hook into the existing Web3 provider ( is already on the page) or propose an alternative, but the final data must enter GA4 cleanly, ideally through Google Tag Manager for easy maintenance. Acceptance criteria – GA4 real-time debug view shows the five...

...its engineers prefer. • Attack coverage baked into the dataset pipeline: the IDS must correctly classify Malware, Phishing, and DDoS patterns. Synthetic generation for edge cases is fine as long as the final validation shows clear detection rates for all three. • Smart-contract aggregator: the chain’s sole responsibility is aggregating model weights. I want a concise contract—Solidity for an Ethereum PoA test-network or chaincode for Hyperledger Fabric—that stores submissions, computes the federated average, and emits the new global state. No on-chain data other than floats and a small hash for versioning. • bridge: a lightweight Python client that listens for the latest global weights, injects them back into the local model, and kicks off the...

Digital Chain of Custody for Forensic Evidence ​Concept: A system for police and legal teams to track digital evidence (logs, hard drive images, CCTV footage) without ta...defense claims it was tampered with after seizure. ​The Solution: When evidence is collected, a cryptographic hash (SHA-256) of the file is generated and stored on a Blockchain. Every time the evidence is "checked out" or viewed by an officer, a transaction is recorded. If the file hash changes even by one bit, the Blockchain rejects it. ​Tech Stack: ​Frontend: React.js or Flutter. ​Blockchain: Ethereum (Sepolia Testnet) or Hyperledger Fabric (for private permissioned access). ​Storage: IPFS (InterPlanetary File System) to store the actual large files; Blockchain only stores the hash. ​Smart Contracts: S...

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I’m building an e-commerce flow where every new order receives its own self-custody Ethereum deposit address. I need a small service that can: • Derive a fresh address from a master wallet (BIP-32/44 HD path preferred) each time my store’s API creates an order. • Secure those addresses behind multi-signature authentication so funds can only be moved with the required M-of-N signatures I specify. • Listen to the Ethereum blockchain in real time, detect incoming payments to any of the generated addresses, confirm once they reach my chosen block depth, and push a webhook or callback so my application can mark the order as paid. You’re free to use tools like , , or a light-client implementation in Node or Go; just keep everything non-custodi...

I need a unified workflow that collects my text documents, images, and videos, packages each bundle as on-chain metadata, and mints it as an NFT on Ethereum. The resulting token must permanently prove ownership, allow normal transfers, and embed a royalty mechanism. Alongside the minting process, I want a language model to process the same material—extract keywords, generate a concise summary, possibly produce embeddings—and write those insights back into the token’s metadata or a linked JSON file. Think Solidity (ERC-721 or ERC-1155 with OpenZeppelin), IPFS or Arweave for storage, plus a Python or Node script that calls GPT-4 / Llama via LangChain or similar. This person must also be familiar with setting up a blockchain and wallets. Specifically using AWS to st...

We are a Web3-focused product team building a modern, scalable NFT Marketplace on Polygon/Ethereum. Our goal is to transform an existing NFT marketplace into a production-ready, secure, and user-friendly platform using modern Web3 standards. The project already has: A working NFT Marketplace Smart contracts (Solidity) A + Tailwind frontend We are now entering the modernization phase to upgrade architecture, security, UX, and performance.

I need a unified workflow that collects my text documents, images, and videos, packages each bundle as on-chain metadata, and mints it as an NFT on Ethereum. The resulting token must permanently prove ownership, allow normal transfers, and embed a royalty mechanism. Alongside the minting process, I want a language model to process the same material—extract keywords, generate a concise summary, possibly produce embeddings—and write those insights back into the token’s metadata or a linked JSON file. Think Solidity (ERC-721 or ERC-1155 with OpenZeppelin), IPFS or Arweave for storage, plus a Python or Node script that calls GPT-4 / Llama via LangChain or similar. This person must also be familiar with setting up a blockchain and wallets. Specifically using AWS to st...

...protocols Implement Fireblocks-based custody and approval policies Monitor risk, exposure, and asset allocation Support audits, compliance, and reporting requirements Evaluate new blockchain networks and DeFi opportunities Required Qualifications 5+ years of institutional crypto asset management experience Hands-on experience with Fireblocks / BitGo / Copper Strong understanding of Bitcoin, Ethereum, L2s, and major blockchains Experience managing large crypto portfolios Ability to communicate technical concepts to business stakeholders Nice to Have CFA / FRM / crypto certifications Experience at crypto funds, exchanges, or custody providers Open-source, research, or thought leadership background Why Join Us Work on institutional-grade crypto infrastructure Compet...

...automation workflows integrated with blockchain, backend, AI, and payments. • Backend automation triggered by blockchain events. • REST APIs with documentation. • AI model integration. • Payment gateway fully integrated. • Clean, production-ready source code. • Short technical documentation explaining system architecture and automation flows. ⸻ Skills Required • Blockchain Development (Ethereum, Solidity, Smart Contracts) • Web3 Integration (, ) • Automation & Workflow Orchestration (n8n) • Full-Stack Development (React.js, Node.js, , PHP, Laravel, Django) • Mobile App Development (Flutter) • AI Model Integration • API Development & Integration • Backend Development (Node.js, Python, Lar...

I’m building a decentralized application on the Ethereum network and need an experienced Solidity developer to write, test, and deploy the core smart contract that will power the dApp. The contract must follow best practices for security and gas-efficiency and be ready for mainnet once we complete testing. You’ll start by defining the contract architecture with me, then move on to clean, well-commented Solidity code. I prefer a modern workflow—Hardhat or Truffle for compilation and testing, plus or for interaction scripts—but I’m open to alternatives if you have a strong preference. Unit tests that reach full branch coverage are essential, along with a brief technical write-up explaining the contract logic, deployment steps, and any upgrade or govern...

Hello I'm looking for an experienced crypto developer or blockchain expert who understands how to work with older (legacy) smart contracts, not new, easily deployable ones. The goal is to recreate or interact with older tokens, sometimes referred to as "flash contracts", to test or emulate tokens similar to USDT Flash (no LP) transferable without liquidation or liquidity pool and NFTs or tokens with embedded logos and attached hashes. Possibility of setting fixed-digit formatting (e.g., padded numeric display like 000 000 000 000 000). Example Tokens: Teller USD (USDT variant) 15-digit minimum (e.g. 000 000 000 000 000). BTCBR (BNB Chain) 24-digit minimum. Shiba Inu (BNB) 18-digit minimum. DAI (BNB). DAI (Fantom). NFT (BNB). XTM (BNB) with and without logo. 18-digit minim...

Hiring for Gold ID (Web3 Domain Name Service) on EVM Chain (Urgent project / Budget negotiable) Project Details: I am building my own blockchain called “EGoldChain” (an EVM-compatible fork derived from BSC/Polygon). I want to develop a domain name registration system similar to ENS (Ethereum Name Service), using the .gold suffix. Example: If a user registers the name nova, the system will generate as an NFT. --- Scope of Work Part 1: Smart Contract (Solidity) Deploy on EGoldChain (I will provide the RPC URL). 1. Core System: • Write contracts based on the ERC-721 (NFT) standard. • 1 domain name = 1 NFT. • Suffix: must always end with .gold. 1. Functions: • Register: Register new names (payment accepted in USDT, and USX in the future). &...

Hiring for Gold ID (Web3 Domain Name Service) on EVM Chain (Urgent project / Budget negotiable) Project Details: I am building my own blockchain called “EGoldChain” (an EVM-compatible fork derived from BSC/Polygon). I want to develop a domain name registration system similar to ENS (Ethereum Name Service), using the .gold suffix. Example: If a user registers the name nova, the system will generate as an NFT. --- Scope of Work Part 1: Smart Contract (Solidity) Deploy on EGoldChain (I will provide the RPC URL). 1. Core System: • Write contracts based on the ERC-721 (NFT) standard. • 1 domain name = 1 NFT. • Suffix: must always end with .gold. 1. Functions: • Register: Register new names (payment accepted in USDT, and USX in the future). &...