Headline

Senior Backend Engineer (SDE-3) @ Cashfree Payments | Golang & Java | Low-Latency APIs, Distributed Systems | Kafka · Redis · PostgreSQL · Kubernetes · AWS | Scaling payments infra to 10,000+ TPS

About

I build backend systems where money moves and latency matters. At Cashfree Payments (SDE-3), I work on payment infrastructure handling 10,000+ TPS in production. I architected our Active-Active multi-region disaster recovery, cutting RPO/RTO from 20 minutes to under 2 — a 10x improvement on a system that cannot afford to be down. Six years in, my work sits in three areas: ⚡ Low-latency, high-throughput services Golang and Java (Spring Boot, Micronaut) microservices exposing REST and gRPC APIs. I built the real-time UPI bank-switch routing engine that scores bank success rates on live traffic and makes routing decisions in the request hot path — a 6% uplift in Card and UPI transaction success rates. 🛡️ Resilience and reliability Active-Active DR across AWS regions (RPO/RTO < 2 min). A GitOps canary deployment framework across 60+ microservices using Kubernetes, ArgoCD, Jenkins, and Datadog — 250+ production incidents prevented, zero-downtime releases with automated rollback. Observability instrumentation that cut mean-time-to-detect for P0 incidents by ~40%. 🧱 Distributed systems fundamentals Kafka (partitioning, consumer groups, cross-region mirroring), Redis, PostgreSQL, Cassandra. Concurrency, idempotency, circuit breakers, and the unglamorous correctness work that keeps a financial ledger honest when downstreams fail. Before Cashfree, I built the Bank Rewards Offer Engine and CRED Locker at 91social, and led backend for Yantra Live at Gurutu. I care about systems that are fast, correct, and boring to operate. Currently going deeper on Rust and low-latency systems design. Open to senior backend engineering roles — Bengaluru or remote. 📫 abhishekranjan2801@gmail.com Tech: Golang · Java · Spring Boot · Micronaut · gRPC · REST · Kafka · Redis · PostgreSQL · Cassandra · Kubernetes · Docker · AWS · Terraform · ArgoCD · Jenkins · Datadog · Grafana · Prometheus

Location

Greater Bengaluru Area

AI stack

claude code

claude

gemini

openai

Work experience

SDE-3 at Cashfree Payments, Oct 2025 - Present · 11 mos, Bengaluru, Karnataka, India, At Cashfree Payments, I have significantly contributed to building robust payment infrastructure. I designed an Active-Active Disaster Recovery system that improved recovery time objectives and developed a Canary Deployment framework that enhanced deployment reliability. My efforts led to a notable uplift in transaction success rates and reduced incident response times, showcasing my expertise in distributed systems and cloud technologies.

Senior Software Engineer at Cashfree Payments, Oct 2021 - Present · 4 yrs 11 mos, Bengaluru, Karnataka, India, • Architected Active-Active Disaster Recovery across multiple AWS regions, achieving RPO and RTO under 2 minutes — a 10× improvement over the previous 20-minute baseline. • Built end-to-end Canary Deployment framework for 60+ microservices using Kubernetes, Jenkins, ArgoCD, and Datadog, preventing 250+ production incidents and enabling zero-downtime releases with automated rollback. • Drove a 6% uplift in Card and UPI Switch transaction success rates by diagnosing routing bottlenecks and optimising retry/failover logic in the payment gateway stack. • Designed and shipped scalable microservices in Golang and Java (Spring Boot, Micronaut), handling peak loads exceeding 10,000 TPS on AWS (EC2, RDS, Lambda, S3). • Enhanced platform observability by instrumenting Datadog dashboards and Grafana/Kibana alerts, reducing mean-time-to-detect (MTTD) for P0 incidents by ~40%. • Authored engineering RFCs and internal documentation on scaling high-traffic payment systems, adopted as onboarding resources for 10+ new engineers.

Software Developer at Gurutu, Nov 2020 - Oct 2021 · 1 yr, Bengaluru, Karnataka, India, - Led backend development of Yantra Live, processing 1,000+ daily orders; improved operational efficiency by 25% through API and database optimisation. - Designed and optimised PostgreSQL schemas and query plans, cutting average response latency by 35% on high-read endpoints. - Reduced go-live production errors by 30% by establishing cross-functional testing protocols and automated regression suites (JUnit, Mockito).

Software Engineer at Valtrove People Solution Pvt. Ltd (91social), Sep 2019 - Oct 2020 · 1 yr 2 mos, Bangalore, - Built the Bank Rewards Offer Engine for CRED, processing 10,000+ rewards/day with sub-100ms p99 API response times. - Developed CRED Locker, a secure document storage service for 50,000+ customer documents, improving retrieval efficiency by 40% via Elasticsearch indexing. - Reduced backend service development turnaround time by 25% by introducing reusable service templates and standardised CI/CD pipelines.

Education

Bachelor of Technology, Electrical, Electronics and Communications Engineering, Dr. A.P.J. Abdul Kalam Technical University

High School Diploma, Electrical, Electronic and Communications Engineering Technology/Technician, Delhi University