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# Sr Software Developer

- **Company:** Lumen Technologies
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** Clean Code Principles, Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Microsoft Azure, Cloud Computing, Cloud Engineering, Continuous Integration, Software Design Patterns, DevOps, Python (Programming Language), NoSQL, Secure Coding, Software Engineering, Test-Driven Development (TDD), Fastapi, Build Management, Containerization, Kubernetes, Docker, Microservices
- **Published:** July 22, 2026
- **Apply:** https://www.buscojobs.com.es/sr-software-developer-en-madrid-ID-363384483

## About the Role

* 7+ years of professional software development experience
 * At least 3 years in a senior engineer role at a large technology company
 * Deep expertise in Python with FastAPI for production-grade apps
 * Experience with cloud platforms (AWS, Azure, or GCP)
 * Containerization (Docker, Kubernetes)
 * Relational and NoSQL databases
 * Messaging queues
 * Strong understanding of design patterns and secure coding principles

## Description

Experteer Overview As a Senior Software Engineer at Lumen, you design and build scalable AI-enabled software in a cloud-native environment.You will develop AI Agents, APIs, microservices, and RAG pipelines, collaborating with cross-functional teams to deliver reliable, secure systems.You drive engineering excellence through clean code, testing, and CI/CD while staying ahead of cloud and AI trends.You will work in a hybrid Madrid setting, contributing to a high-impact, AI-ready connectivity platform.Compensaciones / Beneficios* Design and build high-performance, scalable Python software in the cloud* Develop AI Agents, APIs, microservices, and RAG pipelines* Collaborate with partners, architects, and other engineering teams to define requirements* Promote clean code, TDD, and CI/CD practices* Stay current with cloud, Python, DevOps, and AI trends and advocate adoption* Troubleshoot complex issues to ensure production stabilityResponsabilidades* 7+ years of professional software development experience* At least 3 years in a senior engineer role at a large technology company* Deep expertise in Python with FastAPI for production-grade apps* Experience with cloud platforms (AWS, Azure, or GCP)* Containerization (Docker, Kubernetes)* Relational and NoSQL databases* Messaging queues* Strong understanding of design patterns and secure coding principlesRequisitos principales*


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