Abid Hasan

I’m a Senior Backend Engineer & Tech Lead with 7+ years building high-throughput distributed systems for telecom and enterprise platforms. I specialize in Java (6–21), Kotlin, Spring Boot, and reactive microservices, with a clear focus on scalability, performance, and reliability.

As a Tech Lead, I built a RAG-based contextual search feature for development guides and reporting—using vector search and prompt engineering—to improve customer satisfaction by 20% and cut resolution time to 1/6. I orchestrated full-scale system migrations using AI-assisted development (Cursor & Antigravity), completing in 36h vs. 80h (est.), while leading projects from kickoff to production with 95% on-time delivery. I also migrated legacy reporting to Grafana dashboards, cutting development time and cost by 25%.

Previously, I strengthened reliability and throughput in telecom-grade systems: I implemented a high-throughput URL resolution firewall with SSL bumping, hitting 800 TPS/node in a distributed 3-node setup with Redis caching and Redis Sentinel for high availability. I reworked the SMS delivery report pipeline (600–800 TPS), lifting reliability from 65% to 99.9% by redesigning it into an async dual-table flow with log-based recovery for DB failures. I also built a reactive middleware protocol converter using Spring WebFlux and improved billing throughput by 40% while preserving existing API contracts.

I bring a strong engineering discipline—authored and reviewed HLD/LLD designs, defined service boundaries and failure recovery strategies, and coached junior engineers through structured code reviews. From performance tuning and indexing to incident investigation using logs, thread/heap dumps, VisualVM, and JProfiler, I consistently optimize for stable operations and efficient delivery.