Job Description

Lumen is the trusted network for AI. We’re transforming how businesses connect, secure, and scale in an AI-driven world.

By connecting people, data, and applications quickly, securely, and effortlessly, we help organizations move faster and unlock what’s next.

At Lumen, people power progress. Our culture is built on teamwork, trust, and transparency, giving you the flexibility, support, and opportunity to make a lasting impact. We’re looking for top-tier talent ready to take on the challenge. Join us in building the future.

The Role

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.

Location: Remote (Poland) or Hybrid
Benefits: private health care (Medicover), Multisport card/Multicafeteria, lunchpass card, life insurance (voluntary), PPK (voluntary), English & Polish classes, working abroad policy, CSBF (voluntary), Wellness Day

The Main Responsibilities

• 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.

What We Look For in a Candidate

• 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.

Preferred Qualifications:

• Experience using any vector database like Pinecone / Azure AI Search etc. for AI development.
• 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 Pedantic / 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.

What to Expect Next

Requisition #: 341564

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.

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