OAuth is an authorization protocol enabling a third-party application to access resources, such as data and content, from another resource provider system on behalf of a user. An OAuth Developer is a specialist who has the technical capabilities to facilitate the secure transfer of data from one system to another. OAuth Developers work with clients who want to enable their users to transfer data from one application to another, as well as enable access to external resources with out having to provide credentials.

Essentially, OAuth Developers are responsible for ensuring that the proper security measures are in place for this data transfer, and interoperate various components in order to make it all happen. OAuth Developers require extensive knowledge in backend technologies and security protocols.

Here's some projects that our expert OAuth Developer made real:

  • Building secure single sign-on solutions (SSO)
  • Creating and configuring secure authentication between applications
  • Connecting web apps with external data sources, such as Office365
  • Developing mobile applications with cross platform functionality and secure integration
  • Developing visualizations for IOT systems using React, SGV and Elixir
  • Implementing OAuth 2.0 authentication protocols in different platforms, such as WP or Laravel
  • Integrating APIs with partner websites for secure authentication
  • Developing web apps with authentication protocols in .Net Core 6 and Angular

Our team of highly skilled OAuth developers have completed all kinds of projects related to ensuring the secure exchange of data between applications. If you are looking for a reliable way for your users go authenticate themselves on other systems securely, our developers can be trusted to deliver results on Freelancer.com. We invite you to post your own project now and hire an experienced OAuth Developer from our team!

From 18,055 reviews, clients rate our OAuth Developers 4.9 out of 5 stars.
Hire OAuth Developers

OAuth is an authorization protocol enabling a third-party application to access resources, such as data and content, from another resource provider system on behalf of a user. An OAuth Developer is a specialist who has the technical capabilities to facilitate the secure transfer of data from one system to another. OAuth Developers work with clients who want to enable their users to transfer data from one application to another, as well as enable access to external resources with out having to provide credentials.

Essentially, OAuth Developers are responsible for ensuring that the proper security measures are in place for this data transfer, and interoperate various components in order to make it all happen. OAuth Developers require extensive knowledge in backend technologies and security protocols.

Here's some projects that our expert OAuth Developer made real:

  • Building secure single sign-on solutions (SSO)
  • Creating and configuring secure authentication between applications
  • Connecting web apps with external data sources, such as Office365
  • Developing mobile applications with cross platform functionality and secure integration
  • Developing visualizations for IOT systems using React, SGV and Elixir
  • Implementing OAuth 2.0 authentication protocols in different platforms, such as WP or Laravel
  • Integrating APIs with partner websites for secure authentication
  • Developing web apps with authentication protocols in .Net Core 6 and Angular

Our team of highly skilled OAuth developers have completed all kinds of projects related to ensuring the secure exchange of data between applications. If you are looking for a reliable way for your users go authenticate themselves on other systems securely, our developers can be trusted to deliver results on Freelancer.com. We invite you to post your own project now and hire an experienced OAuth Developer from our team!

From 18,055 reviews, clients rate our OAuth Developers 4.9 out of 5 stars.
Hire OAuth Developers

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    21 jobs found

    I want a web platform that lets Murder Mystery 2 players stake their Roblox items in real-time games—coin flip, jackpot and an upgrader—modelled as closely as possible on the look, feel and flow of bloxybet.com. Coin Flip • Any number of coin-flip rooms can run in parallel. Players should be able to open a room, set the wager, share the link and wait for an opponent, or instantly join an open room. The interface needs the same fast, casino-style experience Bloxybet offers, with live status updates through WebSockets or a similar solution. Jackpot & Upgrader Both games must mirror Bloxybet’s mechanics: tier-based jackpot pools that roll on a timer, and an upgrader where players select an item, choose a percentage chance and see an animation revealing suc...

    $470 Average bid
    $470 Avg Bid
    81 bids

    I’m already using to talk with my clients; now I need those conversations to actually create, move, or cancel service appointments inside Square—and just as easily inside Stripe for the next business I onboard. I am not locked into - if you’ve got a better suggestion let me know why? Here’s what I need the finished solution to do: • Listen to Synthflow’s webhook calls, map the intent (book, reschedule, cancel, quote price) and any slot data, then hit the correct Square or Stripe Booking API endpoint. • Return a clear, conversational response that my agent can read back so the caller always knows what just happened. • Keep everything—API keys, service IDs, time-zone settings—in a single config file or environment block so I...

    $448 Average bid
    $448 Avg Bid
    122 bids

    ## Project Overview Seeking an experienced data engineer to integrate our complete Google marketing stack into Google BigQuery as a centralized data warehouse, with an AI-powered natural language query interface on top. ## Scope of Work **Phase 1: Data Integration to BigQuery** Connect and automate data pipelines from: - Google Analytics 4 (GA4) - Google Ads - Google Search Console - Google Tag Manager - Google Merchant Center Requirements: - Set up automated, near real-time data transfers - Design efficient BigQuery schema with proper data modeling - Implement ETL/ELT processes with data quality checks - Create unified views combining data across platforms - Import historical data - Document all data flows and transformation logic **Phase 2: AI Integration Layer** Implement AI-power...

    $189 Average bid
    Featured
    $189 Avg Bid
    41 bids

    I am looking for an experienced developer to build and deploy a VPS hosted middleware service to run a reliable, production grade integration between GoHighLevel (GHL) and ServiceM8. We are moving to a VPS hosted approach so we can run stable sync jobs, enforce correct data rules, improve logging and traceability, and reduce failures and timeouts. This will be deployed into production for a real business, so quality, security, documentation, and maintainability matter. Preferred hosting DigitalOcean, Sydney region, Ubuntu LTS. Scope and deliverables 1. Bi directional contact sync with deduplication The middleware must reliably sync contacts between GoHighLevel and ServiceM8 in both directions. It must prevent duplicates using sensible matching rules, including: Email matching Phone ...

    $87 Average bid
    $87 Avg Bid
    29 bids
    Steam Sweepstakes Web App
    5 days left
    Verified

    I need a mobile-responsive web app that lets visitors sign in through the Steam API, automatically pulling their SteamID so they can enter free sweepstakes with a single click. The core build should feel snappy on phones first, then scale gracefully to desktop. Key flow • User arrives, taps “Sign in with Steam,” and is authenticated via OpenID. • Once logged in, the site tracks each entry they make, stores it under their account, and presents a simple profile page that shows only their sweepstakes history. Sweepstakes engine An automated job must close each giveaway at the scheduled time, randomly select a winner from valid entries, and fire off both an on-site and email (or Steam message if feasible) notification. I also want an admin view where I can start...

    $716 Average bid
    $716 Avg Bid
    230 bids

    I need a small-scale community-focused website that offers two sign-in options: Google OAuth (Gmail) and a classic email-and-password flow. The primary goal is community engagement, so once users are inside they must be able to create a profile, edit basic details, and exchange direct messages with each other. No e-commerce, no complex forums—just a clean, responsive space for members to connect. A lightweight tech stack is fine as long as it is secure and quick to deploy; React or Vue on the front end and Node, Django, or Laravel on the back end would all work if OAuth and secure password storage are implemented correctly. Mobile-friendly layout is required, and I’d like the initial build hosted on a standard cloud service (AWS, Heroku, Vercel, or similar) so I can test it li...

    $137 Average bid
    $137 Avg Bid
    63 bids

    I’m rolling out a product that runs simultaneously on the web, iOS and Android, and I need a clean, unified way to handle user entry and keep everyone informed in real time. Authentication scope • Support OAuth flows (Google, Apple, etc.) • Maintain JWT-based sessions for our own username/password route • Offer social-media sign-ins side-by-side, all funnelling into a single user table Notification scope • Email messages for transactional events • Push alerts on the mobile apps • SMS for time-sensitive updates Deliverables 1. Reusable modules or SDK integrations for each platform 2. Secure backend endpoints (or rules) that issue and verify tokens 3. Trigger logic that selects the correct channel—email, push or SMS—based o...

    $15 Average bid
    $15 Avg Bid
    15 bids

    We are looking for an experienced AI/Backend Engineer (or small team) to help design and implement a foundational setup for an enterprise “Agentic AI” goal is to enable a prompt-based interface where business users can ask questions and trigger actions across internal risk management and document systems through a governed API layer. This is NOT a chatbot UI project focuses on backend architecture, AI orchestration, and secure enterprise integration. Target application includes IBM OpenPages SaaS (GRC) accessed via REST APIs. The first phase will implement a proof-of-concept that allows an AI agent to retrieve and update structured records using approved APIs via a secure middleware service. Scope of Work (Phase-1: Foundational Setup) Build a secure middleware API servic...

    $91 Average bid
    $91 Avg Bid
    25 bids

    Plaid + Chase Connectivity Issue via API Plaid + Chase OAuth Integration — "Invalid Credentials" After Successful OAuth Flow The Problem: We have a production Plaid integration (Node.js/Express) that connects bank accounts via Plaid Link. American Express and Capital One connect and sync perfectly. Chase fails every time with "Username or password incorrect" AFTER the OAuth flow completes successfully. The Flow: 1. User clicks Connect Bank → Plaid Link opens 2. User selects Chase → Plaid fires OPEN_OAUTH event 3. User redirects to Chase's website and logs in successfully 4. Chase redirects back to our app with oauth_state_id 5. Plaid Link re-opens with receivedRedirectUri 6. Plaid shows "Username or password incorrect" — connectio...

    $34 / hr Average bid
    $34 / hr Avg Bid
    211 bids

    ## Project Overview We are developing a mobile application integrated with a Shopify embedded app and a web-based admin dashboard. We are looking for an experienced **full-stack developer (or team)** and a **UI/UX designer** to support development from wireframing to deployment. This is an MVP with potential for long-term collaboration and feature expansion. --- ## Required Technical Skill Set ### Backend Development * Strong experience with **Node.js / Python / PHP** (flexible stack) * RESTful API development * OAuth and authentication flows (JWT, token-based auth) * Webhook handling * Cloud-based architecture * Database design (Postgres / MongoDB / Firebase or equivalent) * File storage integration (AWS S3 or similar) * Scalable SaaS architecture planning --- ### Mobile Development * ...

    $21 / hr Average bid
    $21 / hr Avg Bid
    190 bids

    I’m building a B2B platform that now has to expose a well-structured REST API so other services can hook in without friction. The immediate priority is to wire my software to a range of external providers—including SMS / Voice APIs, social-media feeds, data-enrichment sources, single-sign-on, scheduling tools and some AI/ML services—while keeping the interface consistent for our own clients. Here is how I picture the job: • Design clean, versioned REST endpoints that sit on top of our existing stack (Node + Postgres) and follow standard verbs and status codes. • Build the integration layer for each third-party service. I need graceful handling of auth flows (OAuth2, JWT, API keys), rate-limits and retries, plus a simple way to toggle providers on or off. &bu...

    $29 Average bid
    $29 Avg Bid
    21 bids

    I need a senior React developer who already feels at home inside the Shopify ecosystem to build a custom embedded app dedicated to product management. The first release will concentrate on two pain points in my current workflow: • Accurate, real-time inventory tracking across all locations • Fast, reliable creation and maintenance of product variants You’ll work with React (ideally TypeScript), Shopify App Bridge, Polaris, and the Admin GraphQL API to deliver an app that lives inside the Shopify admin, authenticates through OAuth, and feels 100 % native. Clear, maintainable code, semantic commits, and component-level testing are expected. Deliverables • A working embedded app installed on my development store • Reusable React components for inventory an...

    $19 / hr Average bid
    $19 / hr Avg Bid
    169 bids

    Title Microsoft Outlook / Graph API Developer for AI-Assisted Email Drafting Tool Description I am building a private productivity application that integrates with Microsoft 365 and uses modern language models to assist in generating email drafts. I’m looking for an experienced developer who can help design and implement an MVP with the following capabilities: • Authenticate users with Microsoft 365 • Access mail folders via Microsoft Graph • Retrieve email metadata (participants, dates, subjects, thread IDs) within user-defined folders and date ranges • Aggregate communications by contact • Provide structured context to an LLM • Create draft messages and save them to the user’s Outlook Drafts folder • Support insertion of deterministic c...

    $1500 - $3000
    Sealed NDA
    $1500 - $3000
    68 bids

    Please read carefully for full consideration DO NOT POST QUESTIONS TO BOARD THEY WILL BE IGNORED There is a technical document if you would like consideration please fill out document alon with your bid this is not a crypto bot and i am not seeking a feature builder Senior Broker Execution Engineer – Full Automation Hardening & System Cohesion – Cash-Only Options Engine I am completing a nearly finished Python-based automated options trading system. Strategy logic is complete. This engagement is not about alpha or indicator development. This is systems engineering, execution safety, wiring integrity, and production reliability. System Context Per current architecture: Schwab Trader API OAuth implemented Token server active Cash account only Single-leg equity...

    $892 Average bid
    $892 Avg Bid
    164 bids

    We are building a recruitment website using Base44 (no-code/low-code platform) and need to integrate it bidirectionally with JobAdder CRM via their REST tasks: Set up OAuth2 Authorisation Code flow authentication (mandatory – JobAdder API requires this; developers must have proven experience). Pull active job listings from JobAdder (GET /jobs endpoints) and display them dynamically on the website (e.g., searchable job board). Handle candidate application submissions from website forms: Create candidates (POST /candidates), attach resumes, and link applications (POST /jobapplications). Use Base44's workspace integrations (prefer OpenAPI spec import if possible) or backend functions for API calls. Ensure clean, secure implementation with error handling, token refresh,...

    $110 Average bid
    $110 Avg Bid
    71 bids

    Full-Stack iOS Engineer (Swift/SwiftUI) — Build LoveLink AI’s Next-Gen Social App LoveLink AI is building a next-generation social networking app for iOS, designed to make connecting feel effortless, modern, and genuinely fun. We’re looking for a full-stack Swift engineer who can take ownership of the product build—from prototype through App Store launch. This role is ideal for someone who’s shipped real consumer apps, thrives in early-stage environments, and can move quickly while keeping architecture clean and scalable. Location: Remote (US Based Preferred or US Hours if Overseas) Engagement: Contract (hourly or milestone-based) Start: ASAP Stage: Prototype → MVP → Launch Meetings: MS Teams What You’ll Build The mission is simple: deliver a s...

    $2497 Average bid
    $2497 Avg Bid
    108 bids

    Overview: We’re looking for an experienced SuiteCRM developer/designer to help us customise a new SuiteCRM 8.9 installation for our sales team. The goal is to create a modern, user-friendly CRM interface that matches our visual designs and delivers a smooth, efficient experience similar to and Zoho CRM. Key Objectives: • Install SuiteCRM 8.9 on our web server (latest version). • Build a custom SuiteCRM theme (no prebuilt themes) to match our provided designs. • Streamline the sales process: intuitive in-line edits, pop-up windows, quick lead management that matches the visual styling of and Zoho CRM. • Develop and refine multiple modules • Integrate with Google Calendar (2-way), email sync, and lead enrichment APIs (, Apollo, , etc.). • Implement dupl...

    $312 Average bid
    $312 Avg Bid
    36 bids

    I have a working prototype built in Google AI Studio and I now need to take it from “demo” to a secure, production-ready release on both web and Android. First, I want every credential locked down. Both the API keys and the code itself must be protected: secrets moved to environment variables or Secret Manager, no keys exposed in the client bundle, and the repository cleaned of sensitive commits. A brief security checklist or automated scan that proves the hardening is complete will form part of the hand-off. Next comes a functionality sweep. I’m not sure whether anyone has formally reviewed the code, so plan to step through each user flow, patch breakages, and make sure the app genuinely meets Minimum Viable Product standards. User sign-in must switch to Google Authen...

    $136 Average bid
    $136 Avg Bid
    127 bids

    I need our existing SaaS booking manager to tap directly into Google’s ecosystem so every customer who signs up can: • connect their Google Calendar, see real-time availability inside our scheduler, and let us push confirmed bookings back to their calendar; • send, receive, and log email through Gmail without ever leaving our app; • rely on a clean, well-documented custom API layer that we can extend to other Google services later. The sign-in step is already handled; what’s missing is the deep, token-based access to Calendar, Gmail, and any other Google endpoints we decide to expose. Your job is to build those flows end-to-end, handle refresh-token management, and return the data in a format our front-end can consume (React + ). Our back-end runs on Node (...

    $29 Average bid
    $29 Avg Bid
    52 bids

    My Shopify store sells digital, downloadable religious artwork and I already set up a Google Marketplace (Merchant Center) account so I can start advertising. The snag is at the very first step: when I connect the Google Marketplace sales channel inside Shopify I get an “authentication failed” message and the process stops. I have not yet used any of the official troubleshooting guides from either platform, and the store is running on a clean theme with no custom code or third-party apps installed, so the cause should be straightforward. I can provide the exact wording of the error and full access to the Google Merchant Center and Shopify admin as soon as we begin. What I need from you: • Identify the root cause of the authentication failure and apply the fix insid...

    $34 Average bid
    $34 Avg Bid
    57 bids
    Fix Azure-Bing Ads Auth
    1 day left
    Verified

    I need someone who has already integrated a SaaS platform with Microsoft Advertising (Bing Ads) through an Azure-registered application and can jump straight into resolving our authentication roadblock. The situation • The Azure AD app exists and should be correctly configured, yet our calls to the Bing Ads API fail at the auth step. • We are using standard OAuth2 flows and the Microsoft Advertising SDK, but tokens are not being accepted downstream. • All tenant-level permissions that look relevant have been granted, so I suspect a subtle setting, scope, or consent mismatch rather than a coding bug. What I’d like from you 1. Review the current Azure AD app registration, API permissions, and redirect settings. 2. Trace the exact OAuth handshake (request, con...

    $38 Average bid
    $38 Avg Bid
    39 bids

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