Available for freelance work
Parv Khandelwal
I'm a freelance Java backend developer building scalable, event-driven microservices for startups and product teams.
I help teams ship high-concurrency systems with 
Featured Project
High-Concurrency Flash Sale System
Stateless JWT auth eliminating per-request DB roundtrips, decoupled checkout via a Kafka order queue, and an atomic Token Bucket rate-limiter in Redis using Lua scripting. Cut DB load by 40%.
Java 21Spring BootKafkaRedis
PostgreSQL
Prometheus
DockerProject
Real-Time Fraud Detection Pipeline
Kafka-backed engine processing 500+ TPS at sub-100ms latency, Hibernate optimistic locking, and live alerts via WebSockets in under 200ms.
Spring Boot
Python MLKafkaDockerWhat I can ship for you
- Event-driven microservices with Kafka
- REST APIs with Spring Boot & JPA
- Redis caching & rate limiting
- Observability with Prometheus/Grafana
- Dockerised deployments & CI/CD
My toolkit
...and whatever your stack needs.
How we'll work together
01
Discovery call
30 min to understand the system, the bottleneck, and the timeline.
02
Scoped proposal
Fixed-scope plan with milestones, deliverables and a clear price.
03
Ship & handover
Iterative delivery on a private repo, with docs and deployment guides.