I need an experienced python and java developer. Must-Have Skills (Non-Negotiable) Advanced Python (3.10+) with strong async/await and asyncio knowledge FastAPI (production experience with async endpoints, WebSocket handling, dependency injection) Celery + Redis (task queues, broadcast patterns, worker scaling, retries, Flower monitoring) Docker & docker-compose (multi-container setups, volumes, networking, health checks) Nginx + Let's Encrypt SSL (reverse proxy, auto-renewal, HTTP-to-HTTPS redirects) Real-time WebSocket experience (python-socketio or similar, handling persistent connections, events like basicapi_*) Redis (as both broker and shared state store for user/device sessions) Strongly Recommended (For Reliable 5000-User Scale) Horizontal scaling & distributed systems (multiple API instances behind a load balancer, auto-scaling groups) Monitoring & observability (Prometheus + Grafana, or at least basic logging/metrics) Cloud deployment (AWS ECS, DigitalOcean App Platform, Render, Fly.io, or Kubernetes basics) Rate limiting & throttling (slowapi or custom logic for high-load scenarios) Basic DevOps (CI/CD with GitHub Actions, environment variables, secrets management) Nice-to-Have / Bonus Skills Lovense Standard Socket API (or similar toy/hardware API experience) Buttplug-py / Intiface integration Audio processing (Librosa or similar) Previous experience with adult/tech toy sync apps or real-time multiplayer systems Kubernetes or Terraform for advanced auto-scaling Experience Level Required Senior (6+ years professional Python experience) At least 2–3 shipped production apps with Celery + Redis + Docker at 500+ concurrent users Proven ability to handle WebSocket-heavy real-time applications