Backend · Advanced · 2–3 weeks
Distributed Background Job Queue
A Redis-backed job system with multiple workers, retries, scheduled jobs, and a dead-letter queue, plus a small dashboard showing what's running and what failed.
- Go
- Redis
- PostgreSQL
- Docker Compose
- Prometheus
Features
- Enqueue API with priorities and delayed jobs
- Exponential-backoff retries and a dead-letter queue
- Horizontally scalable workers with graceful shutdown
- Idempotency keys that prevent duplicate processing
- Metrics endpoint for throughput, latency, and failure rate
Bonus: A chaos test script that kills workers mid-job and proves, with logs, that no job is ever lost.
Backend · Intermediate · 1–2 weeks
Webhook Relay & Replay Service
Receives webhooks from services like Stripe or GitHub, verifies their signatures, stores them, and forwards them reliably to your apps with retries and one-click replay.
- Node.js
- TypeScript
- Fastify
- PostgreSQL
- BullMQ
- OpenAPI
Features
- Per-source HMAC signature verification
- Durable storage with a searchable delivery log
- Retries with backoff and a per-endpoint circuit breaker
- Replay any stored event to any endpoint
- OpenAPI spec with generated API docs
Bonus: A small CLI that tunnels live events to localhost so developers can test webhooks on their own machine.
Backend · Advanced · 2 weeks
API Gateway with Rate Limiting
A reverse proxy that sits in front of your services and handles authentication, rate limiting, caching, and request logging so the services don't have to.
Features
- Config-driven routing to multiple upstream services
- Token-bucket rate limiting per API key, shared across instances through Redis
- JWT validation and API key management
- Response caching with TTLs and manual invalidation
- Structured access logs and latency metrics
Bonus: k6 load tests that publish p50, p95, and p99 latency with and without the gateway in front.
Mobile · Intermediate · 2–3 weeks
Offline-first Field Inspection App
A mobile app for technicians who inspect equipment on site: checklists, photos, and signatures that work with no signal and sync later.
- React Native (Expo)
- TypeScript
- SQLite
- Supabase
Features
- Dynamic checklist templates loaded from the server
- Photo capture with on-image annotation
- Local-first storage with background sync and conflict handling
- Signature capture and PDF report export
- GPS-tagged inspections
Bonus: A small web admin dashboard where managers create templates and review submitted inspections.
Mobile · Intermediate · 2 weeks
Bluetooth LE Sensor Companion App
A phone app that discovers a Bluetooth Low Energy sensor, streams live readings, keeps a history, and sends settings back to the device.
- Flutter (Dart)
- flutter_blue_plus
- SQLite
- ESP32 or nRF52 as the peripheral
Features
- Scan, connect, and auto-reconnect to the device
- A custom GATT service and characteristics that you define
- Live charts of incoming readings
- Local history with CSV export
- Write settings like sample rate and thresholds back to the device
Bonus: Firmware updates delivered over Bluetooth straight from the app.