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Vishnuvardhan Janne
Mid-level Full-Stack Java Developer specializing in FinTech and real-time systems
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Backend/full-stack engineer with finance domain experience (State Street) who built and shipped a Kafka-based real-time trade validation system handling 50k+ trades/sec and cut latency by 42%. Also delivered real-time React dashboards (Redux Toolkit/React Query/WebSockets) and operates AWS EKS microservices with GitOps/ArgoCD; has built a FastAPI + LangChain/GPT-4 intelligent document processing service with JWT/RBAC.
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Key Strengths
- Owned and shipped high-throughput real-time trade validation system end-to-end (50,000+ TPS)
- Reduced validation latency 42% (250ms to 145ms) via async Kafka-based architecture
- Diagnosed and resolved high-concurrency PostgreSQL deadlocks using optimistic locking and retries
- Built real-time trading dashboards with REST APIs + WebSockets delivering ~150ms updates
- Designed PostgreSQL schema for trading validations (trades, validations, rules, audit logs) with indexing and materialized views
- Built production FastAPI backend for intelligent document processing using LangChain + GPT-4 with JWT/RBAC and layered architecture
- Operated microservices on AWS EKS with GitOps (ArgoCD), Jenkins CI/CD, blue-green deployments, feature flags, and automated rollback
- Handled production incident end-to-end: connection pool exhaustion causing latency spike; restored service in ~20 minutes and shipped permanent fix within ~2 hours
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