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Karnan Rajendran
Mid-Level Backend Engineer specializing in SaaS, FinTech, and AI document intelligence
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About
Full-stack engineer who built an AI-driven document analysis and processing workflow end-to-end, including large-document ingestion, queued async processing, and low-latency retrieval for user-facing flows. Demonstrated practical performance tuning (moving heavy work off request path, polling, caching) and Postgres optimization validated with EXPLAIN ANALYZE, plus durable workflow resilience via retries and dead-letter queues.
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Key Strengths
- End-to-end ownership of full-stack production features (backend services through frontend integration)
- Designing scalable document ingestion and async processing pipelines
- Performance troubleshooting via network/API timing analysis and moving heavy work off the request path
- Building resilient workflows with retryable steps and dead-letter queues
- Postgres schema and index design; optimized “latest successful version per document” query using composite indexes and EXPLAIN ANALYZE
- API contract consistency and versioning to prevent frontend breakage
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