Express JS Jobs

I’m building an ambitious FitTech platform and need a developer who can own the entire server-side stack. The project’s focus is squarely on backend development, and I’ve settled on Node.js as the core framework. Your job is to architect and implement a clean, scalable API that will power both web and mobile experiences. You’ll decide on the most suitable database strategy, set up authentication and session handling in a secure way, and write modular code that makes future feature additions friction-free. Real-time performance and smooth integration with wearables or third-party fitness services are important goals, so please be comfortable designing for high concurrency and low latency. Automated testing, clear documentation, and Docker-friendly deployment pipel...

I’m building a MERN-based application and the heart of the project is real-time communication. Everything else can evolve, but I need the live connection layer architected and working flawlessly first. Here’s what I’m after: a React front end that talks to a Node/Express API through WebSockets ( or native WS—your call) so users can interact instantly without refreshing the page. Think low-latency updates that feel as snappy as Slack or Discord. Back-end code should be clean, modular, and ready to plug into a Mongo (or alternative) data store once the wider feature set is finalised. For now, persistence can be lightweight, but the structure must anticipate scaling to a full database layer. To keep us aligned, I’ll consider the work complete when: • A ...

Finish and release four existing apps (React Native/Expo, Node/Postgres, React) for a US-based IoT vending device. The build work is done: these apps took about six months to build and are functionally complete. This job is verified production release, not a new build, and it is priced that way. WHERE IT STANDS The four apps are built and functionally complete: a customer app (React Native/Expo), a service app (React Native/Expo), a backend (Node/Express/Postgres with Stripe) and a React admin dashboard. Tens of thousands of automated tests have been run across the codebases. Each has existing CI, open pull requests, a written release procedure and detailed evidence. What remains is acceptance on real systems: production, real phones and the payment provider. THE WORK 1. Verify the exact...

This project has been replaced by a revised post titled 'Release Four Complete IoT Vending Apps'. Please bid there. Bids on this post are no longer being reviewed.

I am currently working on an existing CRM web application and need an experienced developer to help me fix a few issues in the project. The project is already developed, so I am NOT looking for someone to rebuild the CRM from scratch. I mainly need 1–2 hours of hands-on technical help from someone experienced with the existing stack. What I need help with: Identify and fix existing backend/API issues Debug code Resolve frontend-to-backend communication problems Fix request/response or JSON-related issues Check existing API logic and suggest corrections Explain the root cause of the issues so I can continue working on the project myself This is a short-term debugging/mentoring task, expected to take around 1–2 hours. I would prefer someone who has strong experience wit...

I am looking to build a cutting-edge online casino website featuring progressive jackpot slot games and incorporating cryptocurrency transactions. Here are my requirements: - Implement a variety of exciting and engaging slot variants with a focus on progressive jackpot slot machines. - The website should be designed to support cryptocurrency transactions, offering an innovative and secure way for users to enjoy their gaming experience. An ideal candidate should: - Have experience developing betting websites, particularly online casinos. - Show a strong understanding and knowledge of integrating cryptocurrency payments. - Be experienced in designing engaging and successful slot machine games, specifically progressive jackpot slots.

Mehrere Vollzeitentwickler oder eingespieltes Team für eigenständige WEG-Plattform gesucht Verbindlicher Projektstart: 12. Oktober 2026 Wir suchen mehrere erfahrene Entwickler oder ein eingespieltes Team für die Entwicklung einer eigenständigen, cloudbasierten Plattform zur WEG-Verwaltung. Unser bestehendes Eigentümerversammlungsportal soll integriert und weiterentwickelt werden. Die Hauptentwicklung soll zügig zu einer vollständigen, geprüften und produktiv nutzbaren Version führen. Kleinere Restarbeiten nach der Hauptlieferung sind möglich. Verbindliche Voraussetzungen - Jeder beauftragte Entwickler arbeitet während seiner Projektphase grundsätzlich etwa 40 Stunden pro Woche am Projekt. - Wir suchen mehrere Entwickler. Einze...