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sampath achalla
Mid-Level Software Engineer specializing in backend and full-stack web applications
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Backend engineer focused on scalable, secure, observable systems—built an async workflow backend with REST APIs and state persistence that improved reliability under concurrent load and cut end-to-end processing time ~40%. Strong in production security for multi-tenant systems (OAuth2/JWT, RBAC, DB row-level security) and in low-risk migrations using feature flags and canary releases, including catching and preventing cross-tenant data access issues with CI-based RLS tests.
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Key Strengths
- Designed scalable async backend workflow system with state tracking for concurrent jobs
- Reduced end-to-end processing time by ~40% via async processing and non-blocking I/O
- Improved reliability under concurrent load using persistence, retries, and idempotency
- Production API security implementation (OAuth2/JWT, short-lived tokens, RBAC, centralized rate limiting)
- Led phased backend refactor with feature flags, backward-compatible APIs, and canary releases
- Implemented database-layer row-level security aligned to JWT role/tenant claims for least-privilege access
- Identified and fixed cross-tenant access edge case during load testing; prevented potential data leaks
- Built automated RLS and multi-tenant integration tests in CI to prevent regressions
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