Senior Python Engineer

Ascendion Engineering; India; On-site; INR 3,000,000 - 5,500,000; Full time

Job summary

Ascendion seeks a Senior Python Developer in Bangalore (Hybrid) to design, build and own scalable backend services using Python and FastAPI.

You will drive backend architecture, APIs, microservices, data models, and cloud-native patterns while collaborating with product, frontend, DevOps and security teams; mentoring engineers and upholding coding standards in a fast-paced environment.

Qualifications

• 12–15 years of professional software engineering experience.
• Strong hands-on Python backend development.
• Proven experience with FastAPI or similar Python frameworks.
• Experience in backend architecture and distributed systems.
• Experience with relational/NoSQL databases and caching.
• Familiar with containers, CI/CD, observability, cloud-native.
• Experience with GitHub Copilot to improve engineering productivity.
• Strong Agile communication and mentoring.

Responsibilities

• Design and develop scalable backend services and APIs using Python and FastAPI.
• Own backend architecture and implementation of complex systems.
• Design and consume APIs using OpenAPI/Swagger specifications.
• Build reusable backend components, platform services and integration capabilities.
• Design efficient data models and access patterns across relational and NoSQL databases.
• Implement caching, API security, performance optimization, and distributed system patterns.
• Collaborate with product, frontend, QA, DevOps, platform, and security teams.
• Troubleshoot production issues and conduct root-cause analysis.
• Develop unit, integration, and API test suites.
• Establish coding standards, engineering best practices, and CI quality gates.
• Participate in architecture reviews, technical design discussions, and refinements.
• Work with containers, GitLab CI/CD pipelines, observability tools, and cloud-native technologies.
• Leverage GitHub Copilot for development, refactoring, testing, documentation, and productivity.
• Mentor engineers and provide technical guidance on complex backend solutions.

Skills

Python backend

FastAPI

Backend architecture

REST APIs

Microservices

Distributed systems

Relational DBs

NoSQL DBs

Redis caching

API security

Testing

Performance tuning

Containers

CI/CD (GitLab)

Observability

Cloud-native

Datadog

Azure

GitHub Copilot

Agile

Mentoring

Communication

Tools

GitLab CI/CD

OpenAPI/Swagger

Job description

About Ascendion

Ascendion is a leader in AI-Native platform driven software engineering company that underwrites outcomes, helping businesses innovate faster, smarter, and with greater impact. We partner with Global 2000 clients across North America, UK, Europe, and APAC to solve complex challenges in data, experience design, software product engineering, and workforce transformation. Powered by expert engineers, thousands of AI agents, and our Engineering to the Power of AI™ (EngineeringAI) method, we deliver measurable outcomes that build trust, unlock value, and accelerate growth. Learn more at ascendion.com

Ascendion | Engineering to elevate life

We have a culture built on opportunity, inclusion, and a spirit of partnership. Come, change the world with us:

Build the coolest tech for world's leading brands

Solve complex problems - and learn new skills

Experience the power of transforming digital engineering for Fortune 500 clients

Master your craft with leading training programs and hands-on experience

Experience a community of change makers!

Join a culture of high-performing innovators with endless ideas and a passion for tech. Our culture is the fabric of our company, and it is what makes us unique and diverse. The way we share ideas, learning, experiences, successes, and joy allows everyone to be their best at Ascendion.

Job Title: Senior Python Developer

About the Role

• Senior Python Backend Engineer responsible for designing, developing, and owning scalable, high-performance backend services and APIs. The role focuses on Python/FastAPI development, backend architecture, microservices, distributed systems, and cloud-native engineering. The candidate will drive technical decisions, build reusable platform capabilities, ensure high engineering quality, and collaborate across product, frontend, DevOps, QA, security, and platform teams.
• Key Responsibilities
• Design and develop scalable backend services and RESTful APIs using Python and FastAPI.
• Own backend architecture, technical design, and implementation of complex systems.
• Design and consume APIs using OpenAPI/Swagger specifications.
• Build reusable backend components, platform services and integration capabilities.
• Design efficient data models and access patterns across relational and NoSQL databases.
• Implement caching, API security, performance optimization, and distributed system patterns.
• Collaborate with product, frontend, QA, DevOps, platform, and security teams.
• Troubleshoot production issues and conduct root-cause analysis.
• Develop unit, integration, and API test suites.
• Establish coding standards, engineering best practices, and CI quality gates.
• Participate in architecture reviews, technical design discussions, and refinements.
• Work with containers, GitLab CI/CD pipelines, observability tools, and cloud-native technologies.
• Leverage GitHub Copilot for development, refactoring, testing, documentation, and productivity.
• Mentor engineers and provide technical guidance on complex backend solutions.
• Minimum Qualifications
• 12-15 years of professional software engineering experience.
• Strong hands-on expertise in Python backend development.
• Proven experience building production-grade applications using FastAPI or similar Python frameworks.
• Strong understanding of backend architecture, REST APIs, microservices, and distributed systems.
• Experience designing scalable platform services and reusable backend components.
• Strong experience with relational/NoSQL databases, Redis, caching, API security, testing, and performance tuning.
• Working knowledge of containers, GitLab pipelines/CI-CD, observability, and cloud-native engineering.
• Experience with Datadog or similar observability platforms.
• Azure experience, particularly Azure Container Apps and Azure Blob Storage, is desirable.
• Experience owning technical decisions and architecture for complex backend systems.
• Demonstrated experience using GitHub Copilot to improve engineering productivity and code quality.
• Strong Agile experience with excellent communication, collaboration, and mentoring skills.

Location: Bangalore (Hybrid)