Karthik Ramanathan
Senior Full Stack Engineer & Cloud Architect
Summary
Full Stack Engineer with 6+ years of production experience architecting high-throughput microservices, sub-second Next.js web applications, and event-driven AWS serverless systems. Proven track record reducing cloud infrastructure expenditure by 38% while scaling to 1.2M daily active users.
Core Technical Competencies
Experience
Staff Software Engineer
@ Sovereign FinTech LabsFull-time- Architected real-time payment reconciliation microservice in Go & Kafka processing ₹140 Cr monthly transaction volume with 99.995% uptime SLA.
- Engineered high-performance Next.js 14 web client with TanStack Query and server components, slashing Largest Contentful Paint (LCP) from 3.2s to 640ms.
- Spearheaded migration of 14 Docker containers to AWS EKS with Terraform, reducing AWS compute spending by $4,200 monthly.
- Mentored 8 mid-level and junior developers in test-driven development (TDD), achieving 94% unit test branch coverage across core repositories.
Senior Full Stack Developer
@ Zenith Health SystemsFull-time- Developed end-to-end HIPAA-compliant patient diagnostics portal using React, Node.js, and PostgreSQL, serving 280+ clinical hospitals nationwide.
- Implemented distributed Redis caching tier that trimmed average API response latency by 62% under peak morning OPD load.
- Integrated automated CI/CD deployment pipelines using GitHub Actions, enabling zero-downtime canary releases 3 times weekly.
Key Software Projects
- Engineered pure in-memory client-side PKI digital signature parser verifying X.509 certificates and SHA-256 digests in under 120ms with 0 byte server transmission.
- Surpassed 45,000 monthly active users across India with 100/100 Google Lighthouse Core Web Vitals score.
DistriCache: High-Performance Distributed Memory Store
- Created distributed key-value cache engine supporting Raft consensus protocol capable of handling 85,000 requests per second at sub-millisecond p99 latency.