Description
Experience Requirements

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8+ years of overall experience building and operating backend APIs in production environments

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Minimum 4 years of hands-on experience with FastAPI specifically (not just general Python API frameworks)

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Demonstrated experience owning services end-to-end — design, development, deployment, and monitoring

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Prior experience mentoring engineers or leading technical design discussions is a plus

Responsibilities
- Design and develop high-performance RESTful APIs using FastAPI with clean, validated schemas via Pydantic
- Architect scalable backend systems, making sound trade-offs on performance, reliability, and maintainability
- Implement multi-layer caching (Redis + in-memory L1 cache) to optimize latency and throughput
- Build secure authentication/authorization flows using JWT and OAuth2
- Integrate with external and internal services using async HTTP clients (HTTPX)
- Design and consume message queues for asynchronous and event-driven processing
- Implement standardized, consistent error handling following RFC 9457
- Write productive,



optimized SQL queries and review database interaction patterns
- Drive system design discussions and review architecture proposals across teams
- Write unit/integration tests and uphold high code quality and observability standards

Qualifications
Required Skills (Mandatory)
- FastAPI
4+ years of deep, hands-on production experience — routing, dependency injection, async endpoints, middleware, background tasks
- Pydantic
Strong command of data validation, serialization, custom validators, and schema design (v1/v2)
- Redis
Caching strategies, pub/sub, session/token storage, expiry and eviction policies

Core Skills (Working Knowledge Expected)
- System Design — ability to architect scalable, fault-tolerant, high-throughput backend systems
- Authentication & Authorization — OAuth2, RBAC, secure API access patterns
- JWT — token issuance, validation, refresh flows, and security best practices
- HTT

📌 Backend API Engineer (Hyderabad)
🏢 Zensar Technologies
📍 Hyderabad