Python Developer

Job Description Python API Development Lead

Work Location: Chennai / Bangalore / Gurgaon (Preferred)

Work Model: Hybrid

Shift Timings: 9:00 AM 6:00 PM (General Shift)

Mode of Interview: Face-to-Face

Notice period: Max 30 days

Positions: 2

Domain: Banking

Total Experience: 9+ years

Relevant Experience: 8+ years

Role Overview

We are looking for a hands-on Python API Development Lead with strong expertise in designing, building, and scaling secure, high-performance APIs. The ideal candidate will combine deep Python fundamentals with practical experience in FastAPI / Flask, JWT-based authentication, asynchronous programming, and cloud-native deployments.

This role demands technical leadership, solution design ownership, code reviews, mentoring developers, and close collaboration with Product and DevOps teams.

Key Responsibilities

1 API Design & Development

• Design and develop scalable, secure REST APIs using FastAPI and Flask
• Implement asynchronous endpoints and optimize API performance
• Define API standards including pagination, filtering, versioning, and error handling
• Build reusable, maintainable, and well-documented API services

2 Technical Leadership

• Lead architecture discussions and solution design
• Conduct code reviews and enforce best coding practices
• Mentor junior developers and provide technical guidance
• Collaborate with product owners and DevOps for sprint planning and delivery

3 Security Implementation

• Implement JWT-based authentication and authorization
• Token issuance & expiry
• Refresh token flows
• Claims & scopes
• Secure storage and CSRF considerations
• Ensure secure API access and compliance standards

4 Concurrency & Performance

• Apply multithreading vs multiprocessing appropriately
• Optimize for CPU-bound vs I/O-bound workloads
• Work with asyncio, concurrent.futures
• Handle Uvicorn/Gunicorn performance tuning
• Configure reverse proxies like Nginx

5 Testing & Quality

• Write unit and integration tests
• Implement TDD practices
• Perform API contract testing (OpenAPI)
• Use mocking frameworks
• Ensure linting, formatting, and code quality compliance

6 Deployment & Cloud-Native Delivery

• Containerize applications using Docker
• Implement CI/CD pipelines
• Manage environment configurations
• Work with async DB drivers / ORMs
• Implement caching strategies using Redis

Mandatory Skills

• 9+ years of overall IT experience
• Strong Python fundamentals
• Hands-on experience with FastAPI and Flask
• JWT-based authentication implementation
• Asynchronous programming
• Cloud-native development & deployment
• REST API best practices

Technical Expertise Expected

Python Core Concepts

• List vs Tuple vs Set (performance, mutability, ordering)
• Shallow vs Deep Copy
• Decorators & metadata preservation
• Generators & Iterators (lazy evaluation)

Framework Expertise

• FastAPI (Type hints, Pydantic, DI, async endpoints)
• Flask (Blueprints, extensions)
• Understanding Flask vs FastAPI trade-offs

Desired Skills

• Experience in Banking domain
• Experience with Redis caching
• Async database integrations
• Strong DevOps collaboration exposure

Key Competencies

• Strong technical leadership
• Excellent stakeholder communication
• Mentoring & team guidance
• Architecture thinking & problem-solving
• Ability to drive high-performance API design in enterprise systems

Interested candidates please share your resume to balkis.begam@terragig.in

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