Senior Python Engineer (With React) 1

Ascendion; Bengaluru; On-site; INR 1,200,000 - 2,100,000; Full time

Job summary

Ascendion is seeking a hands-on Principal Software Engineer to join our Backend Platform team. You will design, build, and optimize scalable backend services using Python, FastAPI, and cloud-native tech, with a focus on reliability, performance, and security.

You will own backend architecture, contribute to API design, and collaborate with product, frontend, DevOps, and security teams to deliver robust solutions for Fortune 500 clients.

Qualifications

• Production-grade backend development in Python using FastAPI or similar.
• Strong RESTful API design and OpenAPI/Swagger knowledge.
• Experience with async programming patterns and scalable architectures.
• Proven ability to design reliable backend systems and data models.

Responsibilities

• Design and develop scalable backend services and APIs using Python.
• Own backend architecture, technical design, and implementation for complex systems.
• Collaborate with product, frontend, DevOps, and security teams to deliver robust solutions.
• Write tests to ensure code quality and reliability.

Skills

Advanced Python development

FastAPI

RESTful API design

OpenAPI/Swagger

Async programming

System design

GitHub Copilot

Databases (SQL/NoSQL)

Backend architecture

Tools

Azure Container Apps

Azure Blob Storage

React

Cloud-native tech

Job description

About Ascendion

Ascendion is an AI-native software engineering disruptor helping businesses innovate faster, smarter, and with greater impact. We partner with enterprise clients across North America, the 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.

About Ascendion

Ascendion is an AI-native software engineering disruptor helping businesses innovate faster, smarter, and with greater impact. We partner with enterprise clients across North America, the 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.

Role Summary

• We are looking for a hands‑on Principal Software Engineer with 12-15 years of experience joining our engineering team. In this role, you will design, build, and maintain scalable, secure, and high‑performance backend services and platform capabilities.
• You will work on modern backend systems using Python, FastAPI, Redis, and cloud‑native technologies, while contributing to architecture, API design, performance, reliability, and engineering quality.
• Experience with Azure Container Apps and Azure Blob Storage is desirable. Familiarity with React and frontend integration patterns is a plus.

Responsibilities

• Design and develop scalable backend services and APIs using Python
• Build high‑performance, secure, and maintainable services using FastAPI and similar web frameworks
• Experience building internal tools, dashboards, administrative portals, or developer‑facing applications using React.
• Own backend architecture, technical design, and implementation for complex systems
• Design and consume RESTful APIs with OpenAPI/Swagger specifications
• Build reusable backend components, platform services, and integration capabilities
• Work with relational and NoSQL databases to design efficient data models and access patterns
• Collaborate with product, frontend, platform, QA, DevOps, and security teams to deliver robust solutions
• Troubleshoot production issues and drive root cause analysis and long‑term fixes
• Write unit, integration, and API tests to ensure high code quality and release confidence
• Define and promote coding standards, engineering best practices, and CI quality gates
• Participate in design discussions, technical refinements, and architecture reviews
• Leverage GitHub Copilot to improve productivity, code quality, refactoring, testing, and documentation
• Partner with frontend teams to design efficient API contracts and support seamless frontend‑backend integration

Key Technical Skills

Backend Engineering & Python

• Advanced Python development experience for production‑grade backend systems
• Strong experience with FastAPI
• Familiarity with similar Python web frameworks such as Flask or Django
• Strong understanding of RESTful API design and OpenAPI/Swagger
• Experience with async programming patterns using asyncio, async FastAPI, or similar libraries
• Strong understanding of request lifecycle, middleware, dependency injection, authentication flows, and error handling
• Strong knowledge of software engineering fundamentals, design patterns, data structures, and algorithms
• Ability to write clean, maintainable, testable, and production‑ready code

Data, Caching & Storage

Cloud & Infrastructure

AI-Assisted Development