Harish A

I’m a Software Engineer with 2+ years of experience building scalable microservices and payment systems in fintech. I’m passionate about designing efficient architectures and solving complex distributed systems challenges.

At Surfboard Payments, I architected an intelligent customer management microservice from scratch with multi-factor deduplication scoring and proxy mapping—reducing duplicate records by 95%. I also built an end-to-end Dynamic Currency Conversion (DCC) feature integrated with an acquiring bank to enable real-time FX rate presentation at point of sale, while ensuring compliance with card scheme and regulatory requirements.

I focus heavily on reliability and performance. I resolved critical production bugs in Klarna and card payment integrations, improving payment success rate by 12% through enhanced error handling and retry mechanisms. I also engineered a distributed logging system migrated to Bun runtime with LevelDB storage and batch processing, achieving 3–4x faster startup, 99% API call reduction, and 60% storage optimization.

I enjoy working across the stack when it matters. Earlier, as an Angular Developer Intern, I built a customer contact management app with JWT authentication and UUID-based security, and collaborated with backend teams to integrate PostgreSQL APIs. As a Backend Developer Intern, I developed RESTful APIs with Node.js, NestJS, ORM, and PostgreSQL—optimizing CRUD operations by 50% and validating coverage using Postman and Insomnia.