Headline

Software Engineer @ Cognam | Java · Spring Boot · Microservices · Kafka · Redis · AWS | Building cross-border payment infrastructure | Production RAG & LLM integration | Open to SDE roles

About

I build the backend of money movement — Java and Spring Boot services that move cross-border payments without dropping a transaction. For the last two years I've worked on the core of a regulated fintech platform: Spring Boot microservices and REST APIs behind a cross-border remittance product, with a React/TypeScript admin layer on top. The work is the unglamorous kind that matters — idempotency, audit trails, maker-checker approvals, rate limiting, and query plans. A few things I've shipped: → Investigated and killed a live DDoS attack draining OTP credits, deploying Redis-based distributed rate limiting at the API gateway with zero downtime. → Cut p95 latency on core ledger endpoints from ~800ms to ~180ms with composite indexing and query rewrites, holding through peak load. → Replaced a 20-day manual partner-onboarding process with a self-service Spring Boot pipeline (AWS S3, Lambda, PostgreSQL) that provisions API configs and cryptographic credentials in under 2 hours. → Built a production Retrieval Augmented Generation pipeline with Spring AI and a vector store that cut support escalations ~80%, grounded on live campaign data and built under Responsible AI principles. → Decomposed a monolith into a Kafka-backed event-driven microservice so teams could own their own transactional alerts. Stack I reach for: Java 21, Spring Boot, Spring Security, Spring Data JPA, Spring AI, Apache Kafka, Redis, PostgreSQL, MySQL, REST API design, microservices, AWS (EC2, S3, Lambda, CloudWatch), Docker, Jenkins, CI/CD, JUnit 5, Mockito, React.js, Next.js, TypeScript. Outside work I build systems to learn how they break — a real-time stock portfolio engine on Kafka and Redis, and an offline UPI settlement protocol over Bluetooth mesh with exactly-once guarantees. I'm looking for a backend or full-stack role where correctness under load actually matters — payments, infrastructure, or developer platforms. Open to Delhi NCR, Bengaluru, Hyderabad, Pune and remote. Reach me at kalashsj06@gmail.com.

Location

Bengaluru

AI stack

claude

codex

Work experience

Software Engineer at Cognam Technologies Pvt. Ltd., Jul 2024 - Present · 2 yrs 3 mos, 1. Sole engineer who designed and shipped a full RAG pipeline on Oracle 23ai native vector search — ingestion via Spring AI EmbeddingClient, HNSW cosine index for sub-100ms retrieval, streamed to React via SSE. Cut analyst escalations ~80%. 2. Diagnosed and neutralised a live DDoS attack draining OTP credits in real time; deployed Redis token-bucket rate limiting at API Gateway layer with zero service interruption. 3. Replaced a 20-day manual partner onboarding process with a self-service pipeline (AWS S3, credential provisioning) — reduced cycle time by 99%+ to under 2 hours. 4. Applied vertical partitioning, composite indexing, and query rewrites to transaction-heavy REST endpoints — p95 latency dropped from ~800ms to ~180ms; peak DB CPU down ~40%. 5. Built a Maker-Checker governance engine across 4 entity types with full audit trails, satisfying compliance review requirements.

Software Developer Internship at Cognam Technologies Pvt. Ltd., Jan 2024 - Jul 2024 · 7 mos, Dwarka, Delhi, India, Decomposed a monolithic notification system into a Kafka-backed microservice — decoupled producers from consumers, enabling non-engineering teams to self-serve campaign configuration without engineering involvement. Contributed to migrating a legacy Struts admin portal to Spring Boot microservices + React; containerised services with Docker and set up CI/CD pipelines for independent per-service deployments.

Education

Bachelor of Technology - BTech, Computer Science, Indian Institute of Information Technology Vadodara