Senior Software Developer at MakeMyTrip, building B2B travel-platform services in Java, Spring Boot, Kafka, Redis, Kubernetes, and PostgreSQL.

I work on backend systems where stable contracts, observable failures, careful rollouts, and readable code matter as much as feature delivery.

• Migrating 6 modules and 80+ REST endpoints from Quarkus 3.7 to Spring Boot 3.5.
• Owning API design and backward-compatible evolution across 11 controllers.
• Improving reliability, security, observability, and CI feedback on travel-booking surfaces.
• Partnering with product, QA, platform, and infra teams when changes cross service and team boundaries.

At Comviva (Tech Mahindra), I worked on fintech API gateway paths serving 3.5M+ requests/day across 100+ countries.

• Java 8 / Spring Boot 2 to Java 21 / Spring Boot 3.3 modernization.
• Kafka pipeline work replacing synchronous fan-out where decoupling mattered.
• Redis-backed latency improvements on hot read paths.
• Production fixes around reliability, error handling, and contract stability.

101 merged PRs across backend, infrastructure, docs, and developer-tooling projects.

Full contribution index: singhvishalkr/oss-contributions

I write about Java upgrades, Spring Boot, backend performance, and open-source contribution.

• 7 articles on Medium.
• Top piece: Java 21 to 25 and Spring Boot 3.5 to 4.0, with roughly 12K+ views, 7K+ reads, and 290+ claps.

• event-system - Spring Boot notification service with per-channel FIFO queues, callbacks, graceful shutdown, Docker, and JUnit coverage.
• pr-review-prep - PR triage helper that turns a GitHub pull request into deterministic review notes and risk checks.
• oss-contributions - curated index of open-source pull requests and contribution areas.

• Email: vishal.kr.singh2021@gmail.com
• LinkedIn: linkedin.com/in/singhvishalkr
• Medium: medium.com/@vishal.kr.singh
• Time zone: IST, with EU / UK overlap
• Open to: senior backend / platform roles in India and visa-sponsored roles in NL, DE, IE, UK, SG, and SE