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software engineer
This is a multi-tenant user-role-based application written in Node.js, TypeScript, Fastify, PostgreSQL, and JWT. It allows you to create and manage multiple tenants, users, and roles. Each tenant is isolated from the others, and users can only access the resources of the tenant to which they belong.
Lock-free distributed rate limiting for Express & Fastify. The rate limiter race condition, solved at the Redis level. Sliding-window limits enforced atomically in one Lua round-trip - built for stateless, horizontally-scaled Node.
Distributed product system
A fault-tolerant NestJS microservices engine leveraging Apache Kafka and PostgreSQL to execute financial-grade distributed transactions via the Saga Orchestration pattern.
A distributed task execution engine built from scratch in async Python: priority scheduling, DAG-aware sub-task dependencies, and real-time execution monitoring over Redis. No Celery, no Airflow, just asyncio.
A crash-safe key-value storage engine built from scratch - memtable, write-ahead log, and recovery
Reconstructed the GPT2 124M parameters network