Node.Js Developer

Redesigned backend architecture, consolidating tightly coupled serverless services into scalable monoliths, cutting redundant network calls and introducing local caching, resulting in ~3x reduction in p99 latency (3s → 1s) and 99.9% uptime with significantly enhanced developer productivity. Integrated 30+ decentralized exchanges (DEXs) and cross-chain bridges, handling diverse protocols and complexities to deliver a seamless, transparent, and cost-effective cross-chain token bridging protocol, which consistently handles $100M+ weekly transaction volume. Engineered an RPC distribution engine, removing bottlenecks by dynamically routing traffic to multiple RPC providers, improving throughput and resilience of the entire system. Developed a multi-chain indexer (25+ networks) that ingests blockchain events in real-time via WebSockets, maintains the most up-to-date on-chain data, and delivers instant on-chain transaction status updates to clients using Server-Sent Events (SSE). Enhanced observability by integrating CloudWatch + New Relic APM, enabling distributed tracing and proactive error monitoring.

Led a comprehensive revamp of a core high-traffic product (1k+ req/min), eliminating accumulated tech-debt, reducing p99 latency by 4x (2s → 500ms) through code optimizations, AOT compilation, caching layers, batched calls, and infra co-location (K8s + DB), with zero production downtime. Built and launched Paymaster Spending Policies, a key USP enabling dApps to sponsor transactions across multiple blockchains based on real-time gas, wallet balances, and contract interactions. Spearheaded a cross-team migration from single-instance DBs to Redis clusters, ensuring high availability for mission-critical services, and established SLAs guaranteeing 99.99% uptime through extensive planning and collaboration. Developed an indexing service to efficiently process EVM logs and maintain blockchain states off-chain in MongoDB, cutting RPC costs by ~70% and improving latency for dApps and backend services. Developed a Redis wrapper (ioredis), standardizing internal usage and lowering infra costs by ~25% while enforcing built-in expiration and key-size limits.

Led a team of 5 engineers to launch a community platform for 100k+ young coders, supporting millions of project showcases and hackathons, while collaborating closely with the product team to ensure a seamless user experience. Drove migration to microservices, creating a NestJS + Fastify + TypeScript template that accelerated adoption across feature teams, resulting in improved scalability and maintainability org-wide. Orchestrated seamless migration of 200M+ records from MySQL to MongoDB, eliminating database memory issues and query bottlenecks, with zero production downtime.

Led and mentored a high-performing team of 10 engineers, fostering a collaborative environment built on trust and strong work ethics. Engineered core system architecture from scratch, scaling from a monolith to a microservices network serving 100k+ concurrent users, sustaining p95 latency <50ms with costs under $5k/month. Designed multiple real-time Complex Event Processing (CEP) services on AWS Kinesis to ingest high-volume data streams from MySQL changelogs. These services powered features like real-time User timelines, Game Leaderboards, Fantasy Scoring Engine, and Match Scoreboards. Engineered a live audio/video streaming pipeline with S3 storage and automated multi-format transcoding for adaptive bitrate, powering real-time feeds and supporting 5k+ concurrent streams. Transitioned REST APIs to GraphQL, optimizing client-side bandwidth usage, boosting D7 retention by 7% for Tier2 and Tier3 city users.

Developed serverless APIs (AWS Lambda + API Gateway) handling 200+ req/s with 99.99% uptime and p99 latency <100ms. Implemented rate limiting, access control, and logging, strengthening the security and reliability of mission-critical services.