ServiceAPI Integration & Backend Development
REST and GraphQL APIs, microservices architecture, third-party integrations, background workers and full backend systems built on Node.js and TypeScript.
About This Project
I design and build backend systems — from simple REST APIs to multi-service architectures connecting dozens of external systems. The work ranges from greenfield backend development to integrating your existing app with third-party services.
What I build on the backend: REST APIs with full OpenAPI/Swagger documentation, GraphQL APIs with schema-first design, real-time WebSocket endpoints for live data, authentication and authorization systems (JWT, OAuth, session-based), background job queues for async processing, webhook receivers and event-driven pipelines, and admin APIs for internal tooling.
Third-party integrations I commonly implement: payment gateways (Stripe, Paddle, LiqPay, PayPal), communication services (Twilio SMS, SendGrid, Mailgun, Telegram Bot API), cloud storage (AWS S3, Cloudflare R2, Google Cloud Storage), CRM and ERP systems, social platform APIs (YouTube, Instagram, Twitter/X), and analytics services.
Microservices vs monolith: I default to a well-structured monolith for early-stage products — faster to build, easier to deploy, simpler to debug. I split into services when there is a genuine reason: independent scaling requirements, separate deployment cycles, or team boundaries. I do not add complexity for its own sake.
Stack: Node.js with NestJS or Express, TypeScript everywhere, Prisma for PostgreSQL, Mongoose for MongoDB, Redis for caching and queues, Docker for packaging, and GitHub Actions for CI/CD.