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Krishna Lella
Mid-level Software Engineer specializing in full-stack FinTech systems
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Backend-leaning full-stack engineer with PayPal experience building payment orchestration, settlement, and merchant risk systems at production scale. Stands out for combining cloud-native AWS delivery, database/query performance tuning, and reliability work in event-driven microservices, including a monolith-to-microservices migration that doubled deployment frequency and cut incident response time by 40%.
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Key Strengths
- full-stack development across React/TypeScript and backend APIs
- payments and merchant risk domain expertise
- production PostgreSQL/Aurora query optimization
- AWS cloud deployment with zero-downtime CI/CD
- event-driven reliability improvements in Kafka and SQS systems
- strong production incident diagnosis using Prometheus and ELK
- end-to-end ownership of settlement microservices
- microservices migration leadership
- deployment frequency doubled
- incident response time reduced by 40%
- end-to-end ownership of production backend systems
- real-time payments and fintech backend expertise
- resilient distributed systems design
- latency and database performance optimization
- measurable operational impact
- AI-integrated backend workflow design with rule-based safeguards
- incident ownership and prevention in high-stakes systems
- strong observability and reliability engineering
- navigating ambiguity in early-stage product development
- cross-functional stakeholder alignment
- Shipped end-to-end self-serve subscription cancellation flow (backend + frontend) replacing manual support process
- Designed safe, trackable subscription state changes with idempotent APIs to handle retries/double-clicks
- Billing/payment provider synchronization (Stripe) with robust error handling and logging
- Customer-facing product engineering focus (70–80% application-layer work)
- Improved retention funnel via save-offer step (pause/downgrade) and captured churn reasons for insights
- Reduced support tickets after rollout (self-serve cancellation)
- Built production Python/FastAPI services with layered architecture, JWT/RBAC, tests, and observability
- Performance optimization via query/index tuning and offloading heavy work (webhooks) to async jobs
- AWS production operations and incident response: diagnosed latency spike, optimized DB usage, and scaled services
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