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Rushwant K
Mid-Level Full-Stack Software Engineer specializing in FinTech and microservices
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About
Backend engineer with experience at Discover, Dell, and Carpus building high-concurrency microservices and secure APIs. Delivered measurable impact in fintech workflows by integrating credit bureaus (TransUnion/Experian), cutting loan processing from days to minutes and reducing latency 65% through PostgreSQL tuning and caching. Strong in production security patterns (JWT/RBAC, Postgres row-level security for multi-tenant isolation) and low-risk migrations (shadow mode + incremental rollout).
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Key Strengths
- Designed real-time credit profile verification service integrating external bureaus (TransUnion/Experian)
- Reduced data retrieval latency by 65% via PostgreSQL indexing and caching
- Cut loan processing timelines from days to minutes through high-concurrency microservice architecture
- Balances performance vs. complexity (isolating slow external integrations; availability vs. consistency tradeoffs)
- Contract-first API development in FastAPI using Pydantic schemas and auto-generated Swagger docs
- Scalable stateless security using JWT middleware and role-based access control
- Led backend refactor with shadow-mode validation and incremental traffic migration to reduce rollout risk
- Implemented database-enforced tenant isolation using PostgreSQL row-level security tied to JWT identity
- Improved batch processing resilience by isolating malformed records (poison pill mitigation) and committing valid records
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