Principal Python Engineer for Agentic AI

We are an agile team with a focus on AI in a big international company. We provide Data Science solutions for internal customers inside Deutsche Telekom and our skills and solutions are continually in high demand. Therefore, we want to increase the size of our team with additional technical people who know how to process and analyze data so we can serve and satisfy the needs of even more customers. We are looking for somebody who can work independently, create working solutions quickly, and creatively come up with new ideas, but also knows how to use and where to look for existing solutions. Our project members are also situated in Germany, Slovakia or Romania so video conferencing is the daily standard. Apply and find out more about us and our AIS department! Your responsibilities will include: You will lead the development and improvement of our Python backends for LLM-backed agent applications, such as chatbots, as well as the ongoing evolution of our Agentic AI platform. You will provide technical direction for a team of Agentic AI engineers, define engineering standards, review architectural decisions, and support the team in delivering scalable, reliable, and production-ready solutions. You will improve customer experience by stabilizing and enhancing existing solutions, including better visualization, automated validations, function calling, agent actions, observability, and quality assurance. You will identify and implement new business requirements and translate them into sustainable technical solutions. You will drive cooperation with the business and actively contribute to customer workshops, meetings, and calls. The ability to explain technical topics clearly to business colleagues and demonstrate a consultant’s mindset is essential. You will lead technical brainstorming sessions, architecture discussions, code reviews, and pair programming sessions. You will identify potential use cases for automation, Agentic AI, and data science. Innovative ideas are welcome. You will actively mentor engineers, support their development, and promote software engineering best practices across the team. What we expect from you: Must have: Fluent written and spoken English. At least 8 years of experience building and operating production-grade software in Python, preferably using frameworks such as FastAPI, Pydantic, Temporal, and similar technologies. Proven experience leading engineers, technical workstreams, or software development teams. Strong understanding of software architecture, distributed systems, API design, asynchronous processing, scalability, resilience, and production operations. Preferably strong knowledge of LLM and Agentic AI frameworks such as LangChain, LangGraph, LlamaIndex, as well as Azure OpenAI and OpenAI APIs. Ideally, you have already built and operated a production-ready solution using these technologies. Practical experience with relational databases such as PostgreSQL, in-memory databases such as Redis, and document or search databases such as Elasticsearch and MongoDB. Proven experience designing, building, and operating RESTful APIs and web service applications in production. Cloud and DevOps experience, including Docker, CI/CD tools such as GitHub Actions or GitLab CI, and deployment to Azure, AWS, or GCP. Understanding of production requirements for Agentic AI systems, including testing, evaluation, observability, security, cost management, and reliability. You are comfortable making technical decisions, explaining trade-offs, and aligning engineers and stakeholders around a clear solution. You are flexible, comfortable with changing priorities, and prefer working in agile environments such as XP, Scrum, or Lean. You can explain complex architectures and technologies in a clear and accessible way to customers and business stakeholders. You actively mentor more junior personnel and share your knowledge of software development lifecycle and best practices. Nice to have: German language skills. Prompt engineering and LLM evaluation experience. Familiarity with MLOps or AI workflow orchestration tools such as MLflow or Dagster. Experience with Kubernetes, infrastructure as code, or LLM observability tools. Domain-specific experience in telecommunications or finance. What will you gain: We want you to know that we value our employees and want to provide you with more than just a job. As a valued member of our team, you will receive a range of benefits that include: An annual financial bonus An extra week of holiday (25 days/year), Up to 5 My days, and 1 day off for volunteering Additional paid time offs for married couples/registered partnerships, parents on the first day of school, extended paternity leave, and time-offs for foreigners dealing with state office matters Flexible working hours and the possibility to work remotely Pension plan contribution Free refreshments (water, coffee, tea, milk, and fruits available in the office) Company Shares Alza Discounts Company mobile phone and laptop Meal vouchers in the amount of 160 CZK per working day A variety of Benefits (Cafeteria Plan, Multisport Card, Makro Card) A family program with T-Mobile (discounts for employee’s family members and friends) Training and qualification opportunities (access to the internal learning HUB) Personal development opportunities (career path, job rotation, Bring your own Project) Involvement in various activities supporting charity organizations (Flea markets, volunteering days, food collections) A relocation package for candidates coming from abroad Opportunities for relaxation and wellness activities (massage chair, PlayStation 5, etc.) Fun team events such as brunches, Health Day, and summer and holiday parties! At our company, we believe in creating a positive work environment where employee wellbeing and growth truly matter. If this opportunity excites you and you’d like to join a dynamic team that genuinely cares about its people, send us your CV in English and become part of our journey! As part of Deutsche Telekom Group, we offer not only a healthy work-life balance and international career opportunities, but also strong support for personal and professional development. We encourage performance, ambition, and growth, and provide a wide range of trainings, certifications, and e-learning programs to help you continuously develop your skills. At Deutsche Telekom Services Europe Czech Republic, we are proud to be an equal opportunity employer. We review all applications fairly, without discrimination based on race, color, religion, gender, sexual orientation, gender identity, nationality, citizenship, age, disability, health condition, marital status, or any other characteristic protected by law. We welcome candidates from all backgrounds and strive to create an inclusive, supportive, and empowering workplace where everyone can thrive.