Senior Full Stack Developer Needed for Secure Financial Data Tracking Platform

We are building a platform that pulls information from multiple external APIs, processes and normalizes the data, and serves clean structured responses to our web and mobile applications. We also need lightweight SDKs (JavaScript + Python) so third-party developers can easily integrate with our API.
What You'll Build
REST API Server

Node.js + Express backend with 10-15 endpoints
Redis caching layer to manage rate limits and performance
PostgreSQL database for user data and configurations
WebSocket support for real-time data streaming
Error handling with fallbacks (if one source is down, serve cached data)
Deploy on Railway.app with auto-deploy from GitHub

JavaScript SDK
npm package that wraps all API endpoints into clean one-liner methods
Full documentation with examples
Publish to npm

Python SDK

pip package that wraps all API endpoints
Full documentation with examples
Publish to PyPI


Required Skills

3+ years Node.js + Express
PostgreSQL + Redis
REST API design
WebSocket (ws or Socket.io)
npm/pip package publishing
Git/GitHub
Deployment on Railway, Render, or Heroku