Headline

Backend Engineer | Distributed Systems & Payments | 20K+ RPS at PhonePe (UPI Core)

About

Backend engineer building high-throughput payment infrastructure at PhonePe (500M+ users). Currently on the UPI Core Transactional team — handling 20,000+ RPS and 500M+ daily transactions. Previously owned end-to-end BBPS infrastructure processing 4M+ billpay transactions/day. What I've built: → Greenfield microservice (UPMS) — 0 to 500+ RPS in 5 months → Org-wide async messaging framework (Axon) — 45% infra cost reduction → Active-Active DC migration — circular replication, zero-downtime failover → Status check pipeline overhaul — 20K stuck txns/day → <100 → Piped Gas Meter Reading — 1 week to production, demoed at GFF 2025 I care about: reliability at scale, operational ownership, and building systems that don't wake people up at night. Looking for Senior Backend Engineer roles at product-focused companies. Portfolio: https://arjunprsd.github.io/portfolio/

Location

Pune/Pimpri-Chinchwad Area

AI stack

antigravity

codex

Work experience

Software Engineer - UPI Core Transactional Team at PhonePe, Mar 2026 - Present · 6 mos, Pune Division, Maharashtra, India, Operating on India's highest-traffic payment rail — 20K+ RPS, 500M+ daily UPI transactions. • Building E2C refund status tracking for 2-2.5L daily refunds • Owning NPCI contract architecture and UDIR dispute resolution flows • External PSP integrations (GPay → PhonePe refund resolution)

Software Engineer - BBPS Pod at PhonePe, Feb 2022 - Feb 2026 · 4 yrs 1 mo, Pune District, Maharashtra, India, Owned distributed microservices processing 4M+ billpay transactions/day at 500 RPS peak. Key Deliverables: • UPMS (0→1): Greenfield microservice — sharded DB, proxy layer, recon engine, 20% txn growth • Axon Framework: Async messaging abstraction adopted org-wide — 45% infra cost reduction • Active-Active DC: Circular replication, MemQ migration, 50% blast radius reduction • Status Check Overhaul: 20K stuck/day → <100, resolution 9hrs → <10min • Gas Meter Reading: Contract to production in 1 week, demonstrated at GFF 2025 • Paylink Migration: +15% monthly transactions | Loan API 1.1: NPCI spec compliance Leadership: Mentoring 3 engineers, 117 code reviews, driving design decisions and production triage across pod. "Distinguished" rating (highest tier) — "Completed the implementation flawlessly and quickly"

Software Engineer at Samsung Electronics, Jul 2021 - Feb 2022 · 8 mos, Noida, Uttar Pradesh, India, • Reduced audio device setup time by 30% via Bluetooth module optimization (1,000+ devices) • Samsung SWC Professional certification (DSA)

Student at National Institute of Technology Delhi, Aug 2017 - Jul 2021 · 4 yrs, Delhi, India

Education

Bachelor of Technology - BTech, Computer Science, National institute of technology delhi