SR SOFTWARE DEVELOPER

Lumen is the trusted network for the AI‑powered world, connecting people, data, and applications through our expansive fiber network and connected ecosystem. We enable secure, high‑performance connectivity across cloud, edge, and AI workloads for enterprises, governments, and communities.

At Lumen, you’ll work on infrastructure customers rely on today and build for what’s next, where performance, security, and resilience matter.

This is a high accountability environment where bold ideas drive real innovation for our customers, partners, and industry. The work is challenging, expectations are clear, and trust is built into how we operate. If you’re ready to take ownership, deliver meaningful impact, and help shape the future of AI‑ready connectivity, join us today.

The Role
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We are seeking an experienced Senior Software Engineer to join our growing team. In this pivotal role, you will be instrumental in designing, developing, and deploying highly scalable and resilient AI solutions and AI Agents within our cloud\-native environment.

You will join an international team collaborating closely with colleagues in the United States, requiring regular overlap with US time zones (working hours extending at least until 6:00 PM local time). This is a hybrid position based in Madrid, with an expectation to work from the office approximately two days per week.

The Main Responsibilities
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• 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.

• 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


• Experience with distributed systems and microservices architectures.


• Familiarity with agile development methodologies.


• 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.

Requisition \#: 342306

The above job definition information has been designed to indicate the general nature and level of work performed by employees within this classification. It is not designed to contain or be interpreted as a comprehensive inventory of all duties, responsibilities, and qualifications required of employees assigned to this job. Job duties and responsibilities are subject to change based on changing business needs and conditions.

We are committed to making reasonable adjustments to the recruitment process for people with disabilities. If there is anything we can do to help you, please let us know.

We are committed to providing equal employment opportunities to all persons regardless of race, religion, colour, sex, age, disability or sexual orientation or any other status protected by local or national law. We do not tolerate unlawful discrimination in any employment decisions, including recruiting, hiring, compensation, promotion, benefits, discipline, termination, job assignments or training.

Join a diverse and inclusive culture where everyone is welcome and every voice is heard. A culture where people feel they belong, can be themselves and feel inspired to share different perspectives. Our culture, shared values and behaviours truly make Lumen a fantastic place to work and provides an environment where people can genuinely thrive.

Privacy Notice

Lumen is committed to protecting the privacy and security of personal information collected during the recruitment and hiring process. Our Applicant Privacy Notice explains how we collect, use, disclose, and protect applicant information, as well as how individuals may request access to or deletion of their personal data.

To review Lumen’s Global Employment Applicant and Talent Community Privacy Notice, please visit:

https://jobs.lumen.com/global/en/privacy\-notice

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