Senior AI Engineer, Python, LLM, RAG

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hsag Heidelberger Services AG

WebsiteLinkedInAll Job Openings

501 - 1000 employees

Founded 2005

⚡ Energy

🤝 B2B

☁️ SaaS

Energy • B2B • SaaS

hsag Heidelberger Services AG is a German service and consulting company focused on the energy sector, providing business process outsourcing, billing (heating and operating costs), system and management consulting, and digital solutions. The company offers data cleansing, RPA, chatbots, digital experience checks, marketing, and event services (e. g. , a Zukunftskongress) to energy utilities and suppliers to support IT transformation, customer service automation and end-to-end value chain operations. hsag positions itself as a B2B partner helping energy companies improve processes, customer experience and digital platforms.

📋 Description

• Develop production-ready, AI-powered applications and automation solutions using Python • Design and implement RAG systems and agentic workflows • Develop backend services and REST APIs, including FastAPI • Work with large language models, embedding models, and modern agent frameworks • Ensure the quality, security, and traceability of AI applications within the team • Independently drive implementation and the continuous improvement of the software

🎯 Requirements

• Degree in Computer Science, Data Science, or a related field • At least five years of professional software development experience with Python • Solid experience building backend systems and REST APIs, preferably with FastAPI • Practical experience with LLM-based applications, RAG systems, or agentic workflows • Familiarity with modern AI frameworks such as LlamaIndex, LangChain, PydanticAI, or similar technologies • Commitment to clean, maintainable, and production-ready code • Active participation in code reviews and technical discussions • Independent and responsible working style • Good English skills for team collaboration

🏖️ Benefits

• First-name culture and a collaborative, flat-hierarchy working environment • Permanent employment contract and flexible working hours • Remote work across Germany with full hardware provision • Few rigid structures — plenty of autonomy and entrepreneurial freedom • Diverse training opportunities via our hsag Academy or external partners • Annual employee satisfaction survey to continuously improve the work environment • Team events and cross-location celebrations • Tax-free communication allowance (up to €40 per month) • 54% subsidy for the Deutschlandticket • Health management through the Work-Life Portal app