--- title: "Yash Kumar R. - Senior Software Engineer in Greater Delhi Area | Tal" description: "Meet Yash Kumar R., Senior Software Engineer at JUSPAY based in Greater Delhi Area. AI stack includes claude code, claude, and cursor." image: "https://tal.club/meet/yash-kumar-rajput/share-image" --- # Yash Kumar R\. on Tal ## About Every payment I've touched has had to be right exactly once\. At Juspay, I build the backend systems behind that: transaction services, payment SDKs, and the data infrastructure that watches it all\. My Kafka and ClickHouse pipelines power real\-time analytics over 50M\+ transactions a day, across up to 10,000 dimensions, with strict per\-merchant data isolation\. On top of them, I designed a query DSL and a custom binary storage format that cut reporting infrastructure cost by 30–40%\. I led backend development for Visa Pay and integrated Mastercard's payment SDK, so wallet apps can offer card tokenization and tap\-to\-pay through one SDK\. I joined Juspay as an intern in 2021 and have since worked on nearly every layer of a payment\. That spans card\-present protocol on POS terminals, PIN\-block decryption in Python, Go and Node\.js, and the distributed services and analytics behind them\. So when a transaction fails in production, I can usually trace it from the card tap to the dashboard\. Today I'm a Senior Software Engineer leading a team of 5\. I'm building a gRPC transaction service for POS terminals and securing its service\-to\-service traffic on Kubernetes with Istio, mTLS and SPIFFE workload identity\. The problems I want to spend more time on: idempotent transaction design, correctness under retries and failure, and what breaks first when data volume doubles\. If your team is scaling a transaction or data pipeline, message me your daily volume and I'll tell you where I'd expect it to break first\. ## Location Greater Delhi Area ## AI stack claude code claude cursor gemini hermes agent ollama ## Work experience Senior Software Engineer at JUSPAY, Sep 2026 \- Present · 2 mos, \- Designed and built a gRPC payment transaction service for POS terminals end\-to\-end, owning the system design, API contract and transaction lifecycle\. It's live with its first merchant and load\-tested for multi\-merchant rollout, with service\-to\-service traffic secured on Kubernetes using Istio/Envoy mTLS, SPIFFE workload identity and per\-message ECDSA signing\. \- Led the Visa Middle East card\-acceptance initiative as Juspay's technical partner, building an L3 payment application that implements the complete card\-present protocol \(Java/Kotlin on Android POS, C\+\+ on RTOS\)\. \- Led and mentored a team of 5 engineers through technical design and code reviews, shipping time\-bound payment projects on schedule\. Software Engineer at JUSPAY, Jun 2022 \- Sep 2026 · 4 yrs 4 mos, \- Built and operated resilient, real\-time data pipelines on Kafka and ClickHouse, ingesting \~600 GB/day and powering analytics over 50M\+ daily transactions across up to 10,000 dimensions with strict per\-merchant data isolation for 500\+ merchants\. Kept them running through major version upgrades and live OOM and replication incidents\. \- Migrated report generation off BigQuery onto a custom query DSL over ClickHouse and a binary storage format for log partitioning, cutting report\-generation infrastructure cost by 30–40% through schema/data modeling and query performance optimization\. \- Led backend development for Visa Pay and integrated Mastercard's payment SDK, enabling wallet providers to offer card tokenization and tap\-to\-pay through a single Juspay SDK\. Software Engineer Intern at JUSPAY, Jul 2021 \- Jul 2022 · 1 yr 1 mo, Bengaluru, Built the A/B testing framework that became the mandatory release gate for every microservice at Juspay, gating 50\+ releases a week by comparing transaction success rates between old and new versions across multiple dimensions on 50M\+ daily transactions, so no release could ship a success\-rate regression to merchants like Amazon and Google\. It's still the release gate today, five years on\. Converted to a full\-time offer after 12 months\. ## Education Bachelor of Technology, Computational Science, ABESIT [View the original profile](https://tal.club/meet/yash-kumar-rajput) ```json { "@context": "https://schema.org", "@graph": [ { "@type": "Person", "@id": "https://tal.club/meet/yash-kumar-rajput#person", "name": "Yash Kumar R.", "url": "https://tal.club/meet/yash-kumar-rajput", "image": "https://tal.club/meet/yash-kumar-rajput/profile-photo.jpg", "description": "Meet Yash Kumar R., Senior Software Engineer at JUSPAY based in Greater Delhi Area. 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