Senior AI / Prompt Engineer (LLM Product Integrator)

mcpk. is connecting the best European software engineers with IT businesses from Germany, Austria, and Switzerland. What makes us different from other IT companies? First of all - our philosophy! We believe that we have two kinds of customers - businesses and developers. So we treat each developer as our customer!
Our cooperation is based on one simple principle - you work directly for the company from the DACH region. mcpk., in turn, ensures that everything is functioning well and that you have everything needed for your work. We do not interfere in your daily work as we are big fans of simplicity and transparency.
We are looking for a Senior AI / Prompt Engineer (LLM Product Integrator) to join a Swiss tech company and take ownership of bridging user intent with system execution using GPT-4/5, Claude, and other large language models. You will design and optimise prompts, control and structure AI outputs, and integrate AI into production systems to power real, usable features.
Your qualifications:

• 3+ years of commercial software development experience (backend, integration, or full-stack)
• Proven experience with large language models (GPT-4/5, Claude, etc.) and prompt engineering
• Expertise in structured output generation (JSON, YAML), prompt chaining, and context injection
• Experience integrating AI outputs with backend systems via APIs
• Familiarity with orchestration tools (LangChain, n8n, or similar)
• Skills in testing, refining, and benchmarking AI performance for accuracy, speed, and reliability
• Good English skills, both written and spoken

Nice to have:

• Experience building AI-powered SaaS products
• Knowledge of CI/CD, automated testing, and performance optimisation in AI-driven applications

Your tasks:

• Design, implement, and optimise AI prompts for reliable, structured output
• Integrate LLMs into backend systems through APIs
• Work with orchestration tools to automate AI workflows
• Test, refine, and benchmark AI performance for accuracy, speed, and reliability
• Collaborate closely with the full-stack lead to ensure AI responses power real, usable product features

What we offer:

• 24 vacation days per year, 11 national holidays, and paid sick days
• A powerful laptop to support seamless work performance
• Free English and German lessons
• Full remote job with a flexible schedule
• A long-term B2B/FOP contract
• Competitive compensation paid in EUR

Principles that define us:

• Long-term collaboration. We prioritize building stable, ongoing partnerships with the clients and developers equally, where you can rely on consistent support and a steady work environment, allowing you to work with us for years, not months.
• Professionalism. We know what we do, following best practices, continuously learning, and striving for improvement, always open to new ideas and approaches.
• Integrity and transparency. Our processes are transparent, reliable, and built on mutual respect. We never simplify challenges or misrepresent details, ensuring trust at every step.
• Safe and open environment. We foster a workplace where you are part of a team, and any concerns or issues can be openly addressed without hesitation, ensuring everyone feels heard and supported.
• Flexibility and adaptability. Our flat organizational structure enables quick decision-making, while our flexible approach ensures we can adapt to unique situations and resolve issues efficiently.

If you believe you are a great fit, we would love to explore the opportunity to work with you! #J-18808-Ljbffr