Senior Python Engineer

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

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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)

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