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Ajay Varma Tanniru
Mid-level Full-Stack Developer specializing in FinTech web applications
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Backend engineer who built an e-commerce order processing service in Python/Flask with PostgreSQL, focusing on correctness and reliability (idempotency, Redis locks, async payment processing with circuit breakers). Also integrated an ML recommendation system as a separate FastAPI inference service with caching and async embedding updates, reporting ~25% CTR lift, and has experience with multi-tenant isolation using PostgreSQL row-level security.
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Key Strengths
- Designed ACID-safe order processing and payment tracking with PostgreSQL
- Prevented duplicate orders/double charging using idempotency keys, Redis locks, and DB unique constraints
- Improved reliability of payment integrations via Celery async processing, retries with exponential backoff, and circuit breaker
- SQLAlchemy/PostgreSQL performance tuning (indexes, composite indexes, partitioning, avoiding N+1 with selectinload/joinedload, raw SQL for heavy aggregations)
- Production AI/ML integration: model training (TensorFlow/PyTorch) and serving via FastAPI/Flask with Docker/Kubernetes
- Delivered measurable ML impact: ~25% click-through rate increase from e-commerce recommendations with caching and async updates
- Implemented multi-tenant data isolation using tenant_id scoping and PostgreSQL row-level security
- Scaled high-throughput background processing by batching tasks, caching, autoscaling workers, and adding retries/rate limiting
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