Backend

When a client library wraps ~25 near-identical HTTP endpoints, describing them as data instead of writing 25 methods pays off, with one real trade-off.

A self-hosted URL shortener with a React admin panel, built with Go, Redis, and PostgreSQL.

An open-source unofficial REST API client for the WazirX crypto exchange in Go, acknowledged by WazirX's co-founder.

An open-source unofficial REST/WebSocket client for the WazirX crypto exchange in Java, acknowledged by WazirX's co-founder.

Audited every request in WazirX's official Postman collection against the published API spec and fixed the mismatches: wrong endpoints, wrong param locations, and a typo'd query param, plus four documented endpoints that were missing entirely.

Added endpoints that were missing from WazirX's official Python connector (klines, trade history, coins, withdrawals, sub-account transfers) and fixed a mismapped system_status endpoint.

Added usedDatabaseSize plus per-index document and embeddings metrics to the Java client's stats object, mirroring what I'd already added to the Go client.

Added usedDatabaseSize, per-index document count, and embeddings metrics to the Go client's stats response, across three small PRs.

Blockchain integrations and fault-tolerant wallet-sync workflows for a crypto portfolio and tax platform.

Led backend architecture for a multi-tenant B2B carbon-accounting SaaS: schema, APIs, and a Scope 1/2/3 emissions engine.

Led an online poker platform with advanced tournament features and an event-driven backend for thousands of concurrent players.

Designed the database architecture for an in-house Global Distribution System and a serverless bus-ticket booking engine.

Five-plus years on a real-money real-time poker platform: game logic, load testing at 21,000 simulated concurrent players, disaster recovery, and a PHP → Node.js migration.