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• Concurrency Optimization: Refactored legacy asynchronous algorithms by replacing unconstrained semaphore-driven goroutine spawning with a fixed-size Worker Pool pattern in Go, ensuring stable memory footprint and predictable resource utilization.
• System Design & Caching: Designing a 'recent contacts' service for P2P send/request money flows, architecting an LRU caching mechanism to guarantee low-latency data retrieval and optimize database load.
• Mentorship: Onboarded and mentored a new engineer, guiding them through the codebase and development workflows to accelerate their ramp-up to full productivity.
• Cross-Team Tooling: Collaborated with the Web Dev team to build a self-service portal for Mobile Recharge packages, eliminating manual SQL entry and enabling dynamic, error-free package management.

Stack Go, PostgreSQL, Redis, Microservices

• Optimized User Onboarding: Accelerated the signup flow by migrating temporary state data from PostgreSQL to RedisJSON, significantly reducing latency.
• System Observability: Engineered a centralized logging library with distributed request-ID tracing across 20+ microservices, dramatically reducing production debugging time.
• Secure Fintech Integrations: Spearheaded direct fund integrations with Nagad and City Bank, securing financial communications with AES-CBC encryption and HMAC signature validation.
• Automated Reconciliation: Architected a Dead Letter Queue (DLQ) mechanism to handle transaction failures, automating financial reconciliation and reducing manual workload for the finance team.
• Architectural Resilience: Decoupled eKYC verification into an asynchronous process to bypass external portal downtimes, severely dropping signup failure rates.
• Merchant Platform: Built core backend modules for the Merchant portal, including merchant onboarding, MFS withdrawals, and beneficiary management.

Stack Go, PostgreSQL, Redis, Docker, Kubernetes