Full Stack Developer at DXC Technology

Built end-to-end digital wallet features using React, Fastify, and PostgreSQL, enabling 1M+ transactions/month while keeping p95 API latency under 200ms for core payment flows. Designed atomic wallet balance and P2P transfer workflows, applying transactional integrity and locking strategies to eliminate 100% of double-spend scenarios in distributed services. Integrated third-party banking, utility bill payments, and mobile top-ups, implementing retry, idempotency, and reconciliation logic to achieve 99.95% transaction success rate. Optimized database schemas, indexing, and query execution plans, improving transaction read/write performance by 35% during peak usage. Implemented structured logging, metrics, and alerting, reducing mean time to detect (MTTD) by 60% and maintaining 99.9%+ platform uptime in production.

Backend Developer at Havicma Logistics

Re-architected the logistics tracking system from 60-second polling to a real-time WebSocket-based model, achieving <300ms latency for 500+ concurrent drivers using Node.js, Redis Pub/Sub, and GEO indexing. Built backend ingestion pipelines using Redis GEO + Hot/Cold storage separation, enabling instant location updates in Redis and bulk-write persistence to MongoDB, reducing database load by 90% during peak hours. Developed an interactive real-time tracking dashboard using React + Leaflet, implementing interpolation (“lerp”) animation to smooth GPS updates and deliver a fluid, zero-jitter dispatcher experience. Deployed AWS-powered infrastructure using CloudFront, Lambda, S3, and API Gateway, improving global access performance and maintaining 99.99% uptime during high-volume logistics operations. Automated CI/CD workflows with Docker + GitHub Actions, enabling consistent rollouts, faster deployments, and high reliability across staging and production environments.