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harman Barpaga
Junior Software Developer specializing in backend microservices and DevOps
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Built and operated a real-time student event/party discovery platform with map-based search, RSVP, and authentication using React/TypeScript, Node.js, and Firebase Firestore. Demonstrates strong backend correctness under concurrency (transactions, idempotency, retries/backoff) and solid API product thinking (versioning, Swagger docs, structured errors, cursor pagination), including custom geospatial querying via Haversine filtering.
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Key Strengths
- Owned end-to-end full-stack TypeScript system in production (React + Node + Firestore)
- Concurrency correctness using Firestore transactions to prevent RSVP/event overbooking
- Designed idempotent workflows with retries and backoff to handle contention and failures
- API design for external developers: URL versioning, JWT auth, Swagger docs, consistent responses
- Improved developer experience via structured error codes/messages and cursor-based pagination
- Pragmatic workaround for Firestore geospatial limitations using bounding-box queries + Haversine filtering
- E2E automation experience with Selenium/Playwright using resilient selector strategies
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