Senior Python Backend Engineer

Tekskills Inc.; Kolkata District; On-site; INR 3,000,000 - 5,000,000; Full time

Job summary

Tekskills Inc. is seeking a Senior Backend Engineer in Kolkata to design and implement high-performance services using Python and FastAPI. You will drive architectural decisions, mentor engineers, and ensure robust APIs with MongoDB-backed data models.

You will optimize systems for scalability, security, and reliability, while collaborating with product, design, and QA teams. Your strong debugging, architecture, and AI-assisted coding mindset will shape core backend strategies.

Qualifications

• 8+ years of backend engineering experience.
• Proficient in Python and FastAPI.
• Hands-on MongoDB expertise.
• Strong debugging and problem-solving skills.
• Experience with scalable infrastructure and APIs.
• Familiarity with cloud platforms and containerization.
• Ability to document technical designs clearly.
• Experience mentoring teams.

Responsibilities

• Design, build, and maintain high-performance backend services using Python and FastAPI.
• Architect scalable, secure backend systems and microservices.
• Develop RESTful APIs and ensure seamless integration with frontend and third-party services.
• Lead end-to-end system architecture design, including infrastructure and deployment pipelines.
• Work with MongoDB including schema design, indexing, aggregation, and performance tuning.
• Optimize queries and data models for scalable, high-throughput applications.
• Debug complex production issues, perform root-cause analysis, and deliver robust fixes.
• Identify systemic issues and propose long-term solutions.
• Create detailed use cases, troubleshoot technical debt, and improve existing codebases.
• Leverage AI tools to accelerate development workflows (e.g., debugging, architecture suggestions, documentation).
• Explore opportunities to integrate AI into backend systems and automation tasks.
• Collaborate with DevOps on deployment and monitoring.
• Work with cross-functional teams (product, design, QA).
• Mentor junior developers and contribute to engineering best practices.
• Participate in code reviews and architecture discussions.

Skills

Python

FastAPI

Debugging

Problem-solving

Backend design patterns

Mentoring

Tools

MongoDB

Docker

CI/CD

AWS

Job description

Job Summary

Senior Backend Engineer with deep expertise in Python, FastAPI, and MongoDB. The ideal candidate is strong in debugging, core backend problem solving, architecting scalable systems, and leveraging AI-driven approaches to enhance development and design workflows. You will play a key role in designing backend infrastructure, building robust APIs, improving system performance, and mentoring teams through technical challenges.

Responsibilities

• Design, build, and maintain high-performance backend services using Python and FastAPI.
• Architect scalable, secure, and maintainable backend systems and microservices.
• Develop RESTful APIs and ensure seamless integration with frontend and third-party services.
• Lead the design of end-to-end system architecture, including infrastructure and deployment pipelines.
• Work extensively with MongoDB including schema design, indexing, aggregation pipelines, and performance tuning.
• Optimize queries and data models for scalable, high-throughput applications.
• Debug complex production issues, perform root-cause analysis, and deliver robust fixes.
• Identify systemic issues and propose long-term solutions.
• Create detailed use cases, troubleshoot technical debt, and improve existing codebases.
• Leverage AI tools to accelerate development workflows (e.g., debugging, architecture suggestions, documentation).
• Explore opportunities to integrate AI into backend systems and automation tasks.
• Contribute to infrastructure planning: cloud services, containerization, CI/CD pipelines.
• Collaborate with DevOps to ensure smooth deployment and monitoring.
• Work closely with cross-functional teams (product, design, QA).
• Mentor junior developers and contribute to engineering best practices.
• Participate in code reviews and architecture discussions.

Required Skills

• 8+ years of backend engineering experience.
• Strong proficiency in Python and frameworks such as FastAPI (mandatory).
• Hands-on experience with MongoDB (mandatory).
• Excellent debugging, code-analysis, and problem-solving skills.
• Strong understanding of backend design patterns, multithreading, concurrency, and API security.
• Experience designing scalable infrastructure.
• Familiarity with cloud platforms (AWS/Azure/GCP), Docker, CI/CD (preferred).
• Ability to create clear technical documentation and use-case diagrams.
• Ability to leverage AI tools to improve development efficiency.

Good to Have

• Experience with microservices architecture.
• Knowledge of asynchronous programming.
• Exposure to distributed systems, message queues (Kafka/RabbitMQ).
• Experience with monitoring tools (Prometheus, Grafana, ELK).