Backend & API Development

What this service covers

I design backend systems that make product behavior explicit: validated requests, clear data ownership, resilient jobs and useful interfaces for clients.

• REST and JSON-RPC APIs with typed validation
• Authentication, authorization and rate limiting
• PostgreSQL data modeling and transactions
• Redis caching, queues and worker processes
• Webhooks, third-party integrations and real-time updates
• gRPC endpoints where the client ecosystem calls for them

How I build it

I start with the resources and trust boundaries behind an API. Request schemas, permissions and transaction rules are easier to maintain when they are part of the contract from the beginning.

Reevera's Fastify API validates AI-proposed commands before state changes, while its worker fleet handles tasks too expensive for a request cycle. Qbitcoin exposes JSON-RPC and gRPC interfaces for wallets and explorer clients.

Engineering decisions

Retries, duplicate webhooks and concurrent writes need intentional handling. I use idempotent work where possible and database transactions for operations that must stay consistent.

Real-time delivery should match the direction of data flow. Reevera uses SSE for server-to-client progress rather than adding a bidirectional socket layer where it is unnecessary.

Related project work

The linked case studies show application backend work and protocol-facing APIs in two different settings.

Reevera ↗ · Qbitcoin ↗

Technology and scope

Node.js, Fastify, TypeBox, PostgreSQL, Redis, BullMQ, SSE, Python, JSON-RPC and gRPC are represented in published work.

Getting started

Share API consumers, expected data volume, current schema, identity model and reliability requirements. We can define a small contract before implementation.