Open to opportunities

Sumit User

@sumituser8

Message

Backend Software Engineer building event-driven integrations with Java and reliable APIs.

India

Message

What I'm looking for

I’m seeking SDE-1/Junior Backend roles where I can build reliable, event-driven webhook integrations and well-designed APIs—shipping production-grade features with strong idempotency, performance, and clean backend architecture.

I’m a Backend Software Engineer with production experience building event-driven integrations, webhook pipelines, and REST APIs using Java, Spring Boot, MongoDB, and PostgreSQL. At Cent, I delivered a real-time webhook ingestion service with sub-second sync latency, adding idempotent exactly-once state transitions using HMAC-SHA256 validation and TTL-indexed deduplication.

I’m also hands-on with downstream integrations—syncing LeadSquared CRM records to MongoDB, implementing Ringg.ai telephony webhook handling to auto-create CRM activity, and developing Django/Python Orders & Payments modules. Beyond production work, I build AI- and security-focused systems like a multi-tenant RAG DocSense API (pgvector + LangChain4j) and RBAC workspace project management (JWT with refresh token rotation), and I enjoy shipping reliable, well-structured backend services.

Experience

Work history, roles, and key accomplishments

Current

SDE Intern

Current

Cent Engineered

Apr 2026 - Present (2 months)

Built a real-time, event-driven webhook ingestion service in Spring Boot to sync LeadSquared CRM records to MongoDB, eliminating manual data entry and achieving sub-second sync latency. Implemented idempotent Razorpay payment event processing with HMAC-SHA256 validation and TTL-based deduplication to ensure exactly-once state transitions on retries, plus telephony webhook handling to auto-create C

Java Spring Boot MongoDB Webhooks Idempotent Processing SHA 256 Exactly Once Semantics

Software Developer & ERP Intern

Xencore Global Pvt. Ltd.

May 2025 - Nov 2025 (6 months)

Designed and maintained 8+ REST API endpoints for inter-module ERP data exchange, reducing integration failures by 15–20% via consistent contract validation and structured error handling. Automated backend data processing workflows, saving 1–2 hours of daily manual effort and improving reliability across interconnected ERP modules.

Java REST APIs ERP Integration Error Handling Workflow Automation Backend