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Sudhanshu Singh

@sudhanshusingh4

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Backend engineer building Java microservices with Kafka, React, and AI-powered search.

India

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What I'm looking for

I’m looking for a backend-focused role where I can build resilient Java microservices, real-time features, and data/AI search. I want a team that values measurable performance, clean architecture, and fast iteration.

I’m a B.Tech Computer Science & Engineering graduate (Calcutta Institute of Engineering and Management, 2020–2024) who builds production-minded systems end to end. I enjoy designing scalable services, measuring performance, and using events and data structures to deliver real-time experiences.

In TinyRoute, I built a full-stack URL shortener with Spring Boot, React, PostgreSQL, Docker, and Redis—adding features like custom aliases, QR codes, URL expiration, and role-based access control. I also optimized redirect analytics by replacing 9 Redis round-trips per request with a single atomic Lua operation, boosting throughput 2.6x and cutting p95 latency by 61%.

On ChatFlow, I architected real-time chat as microservices using Apache Kafka, WebSockets, and the Transactional Outbox Pattern, deploying on Kubernetes. I combined pgvector-based semantic search and RAG-style chat history Q&A with citations to deliver grounded answers and unread-message summaries, alongside reliable rate limiting, JWT auth, and resilient service behavior.

Experience

Work history, roles, and key accomplishments

ChatFlow

Architected a real-time chat platform as five Spring Boot microservices deployed on Kubernetes, including friend requests, private/group messaging, presence, and notifications. Implemented reliable event-driven communication with Kafka and Transactional Outbox (idempotent consumers), plus AI-powered semantic search and RAG-based chat summarization with grounded, cited answers.

Java 21+Spring Boot Apache Kafka WebSockets Kubernetes Transactional Outboxes Resilience4j

TinyRoute

Built a full-stack URL shortener with custom aliases, QR-code generation, URL expiration, and role-based access control. Optimized redirect analytics by replacing 9 Redis round-trips with a single atomic Lua operation, improving throughput 2.6x (2.0k to 5.4k req/s) and reducing p95 latency 61% (176 ms to 68 ms).

Java Spring Boot PostgreSQL Redis JWT Lua Scripting Docker Resilience4j

FileSeek

Developed an installable Java CLI full-text search engine indexing 25K+ files into a positional inverted index and returning ranked results in under 15ms using BM25 relevance scoring. Added phrase, fuzzy, prefix, and regex-enabled searches with incremental re-indexing and a concurrent indexing pipeline with filesystem monitoring.

Java Apache PDFBox ConcurrentHashMap Inverted Indexing BM25 Fuzzy Search (Levenshtein)WatchService GZIP Compression