About this role

Lumen Technologies is hiring a senior-level Software Engineer based in Madrid, Spain. The posting calls out experience with Python, AWS, GCP, Azure and roughly 7+ years of relevant work. Listed education preference: a bachelor's degree or equivalent.

Role: Software Engineer
Function: software engineering
Level: senior
Track: Individual contributor
Location: Madrid, Spain
Experience: 7+ years
Education: Bachelor's degree
Posted: Jun 11, 2026

AI Summary

Design and develop complex software systems using Python and FastAPI in cloud environments. Build AI agents, APIs, microservices, and RAG pipelines while collaborating with architects and engineering teams. Requires 7+ years software development experience, 3+ years as senior engineer, deep Python/FastAPI expertise, cloud platform proficiency, and AI/agentic framework knowledge.

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Job description

from Lumen Technologies careers

Design, development, and implementation of complex software systems using Python, ensuring high performance, scalability, and reliability in a cloud environment. Develop robust AI Agents, APIs, microservices, and RAG pipelines to support various applications and services. Collaborate closely with business partners, architects, and other engineering teams to define technical requirements and deliver innovative solutions. Drive technical excellence, promoting clean code, test-driven development, and continuous integration/continuous deployment (CI/CD) practices. Stay abreast of emerging technologies and industry trends, particularly in cloud computing, Python, DevOps, and AI, and advocate for their adoption where appropriate. Troubleshoot and resolve complex technical issues, ensuring the stability and availability of our production systems. Bachelor's or master's degree in computer science, Software Engineering, or a related technical field. 7+ years of professional software development experience, with at least 3 years in a senior engineer capacity at a large technology company. Deep expertise in Python using Fast API is mandatory, with a proven track record of building and deploying production-grade applications. Extensive experience with cloud platforms (AWS, Azure, or GCP) is required, containerization (Docker, Kubernetes), databases (relational and NoSQL), and messaging queues. Strong understanding of software engineering best practices, including design patterns, and secure coding principles. Excellent problem-solving skills, with the ability to analyze complex technical challenges and propose effective solutions. Strong communication and interpersonal skills, with the ability to articulate technical concepts clearly to both technical and non-technical audiences. Well versed with context and prompt engineering techniques Experience using any vector database like Pinecone / Azure AI Search for AI development. Experience with multi agentic framework like Pydantic AI / Crew AI / Cloud centric frameworks like Microsoft Agent framework, or AWS agent core for agentic development Well versed with agentic protocols like A2A, MCP to drive agentic development Familiarity with agile development methodologies.