Hi, I'm Sachin Singh, a Backend Software Developer with 4+ years of experience building scalable and high-performance systems across telecom and financial platforms. I specialize in Java, Spring Boot, Microservices, Python, PostgreSQL/Oracle, and System Design (HLD/LLD), with a strong focus on performance optimization and backend architecture. Over the years, I've worked on large-scale production systems handling high transaction volumes and solving complex engineering challenges. Some of my key achievements include: • Reduced a 100k record report generation time from ~5 minutes to ~1 second through SQL optimization and database tuning • Improved API p50 latency from 195ms to 90ms through query optimization and connection pool improvements • Worked on systems sustaining 1,000+ TPS with peaks around 2,100 TPS • Built distributed load testing solutions using Locust, Prometheus, and Grafana across 32 microservices • Designed and optimized multiple Spring Boot microservices and scalable backend solutions I enjoy discussing: ✅ Backend Development ✅ System Design (HLD/LLD) ✅ Java & Spring Boot ✅ Performance Optimization ✅ Interview Preparation & Career Guidance Feel free to connect if you want to discuss engineering challenges, system design, backend architecture, or career growth in software development. For a stronger Topmate conversion rate, you can also add a call-to-action: "Book a session if you'd like guidance on Backend Development, System Design, interview preparation, or solving performance bottlenecks in real-world applications."