I build backend systems and APIs — REST, GraphQL, and webhook-driven architectures — using Go, Node.js, NestJS, and Python. If you need an API that holds up under real traffic, not just Postman tests, this is what I do.
What I Build
- REST and GraphQL APIs — for web, mobile, and third-party integrations
- Webhook systems — reliable event delivery between your app and external services
- Authentication and rate limiting — protecting endpoints from abuse
- Database-backed services — PostgreSQL, MongoDB, and Redis for caching and queues
- Microservice and monolith architectures — whichever actually fits your team’s size
Real Use Cases
- Full-stack backend builds — APIs paired with the frontends and databases they serve
- Blockchain and Web3 backends — indexing on-chain data and serving it through REST/GraphQL
- Telegram and Discord bot backends — webhook and polling architectures behind bot logic
- AI application backends — API layers connecting LLM integrations to production apps
Technology
- Go and Node.js — high-throughput API servers
- NestJS — structured, typed backend architecture
- Python — data processing and AI-adjacent services
- PostgreSQL, MongoDB, Redis — storage, caching, and queues
Built to Handle Real Traffic, Not Just the Happy Path
An API that only works when every request is well-formed isn’t production-ready. I build with rate limiting, input validation, and proper error responses from the start, so your API fails gracefully instead of falling over.
FAQ
Should I use REST, GraphQL, or gRPC?
It depends on your clients and how your data is shaped. REST is the safest default, GraphQL helps when clients need flexible queries, and gRPC shines for internal service-to-service calls. I’ll walk you through the tradeoffs for your specific case.
How do you handle authentication?
JWT-based auth is the most common approach I use, with rate limiting layered on top to prevent abuse. For more sensitive systems, I’ll add role-based access control and audit logging.
Can you work with my existing backend, or does it need to be new?
Both. I can extend an existing API, migrate a monolith toward microservices, or build a new backend from scratch — depending on where your product actually is.
Related Reading
- REST vs GraphQL vs gRPC: Picking the Right API for Your App
- API Rate Limiting and Authentication: Protecting Your Backend From Abuse
- Webhooks Explained: How Systems Talk to Each Other in Real Time
- Choosing a Database for Your Startup: SQL vs NoSQL in Practice
- Monolith vs Microservices: What Actually Makes Sense for a Startup
Discuss Your Project
Have an API or backend that needs building or fixing? Get in touch to talk through scope, or reach out via Fiverr if you’d rather start there.