Prompt Engineer : Onpreo

March 23, 2026
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Job Description

  • Anywhere

onpreo is the acquisition system for the real estate industry!

To this end, we provide brokers with all the tools they need to prevail against the competition and grow their company faster and more sustainably. We are a young team consisting of high performers. We don’t look at your degree, but at your passion and skills.

Apply to us and seize the opportunity to participate in a transformation process in one of the largest industries in the world.

Responsibilities

  • Development and optimization of prompts for generative AI models, especially in the field of voice AI
  • Perform tests to improve model performance, accuracy, and relevance of results
  • Fine-tune and automate prompts to increase efficiency and consistency
  • Analyze usage data and model outputs to enable continuous improvement and data-driven decisions
  • Integration and tuning of voice AI systems based on platforms such as fonio, vapi ai, retell ai, ElevenLabs or Deepgram
  • Develop, train, and maintain your own voice AI prototypes and workflows
  • Observation of current trends and technical developments in the field of generative AI, prompt engineering and language models for the further development of internal strategies

Qualification

  • Experience in working with voice and AI platforms such as fonio, vapi ai, retell ai, ElevenLabs, Deepgram or comparable tools
  • Knowledge of the integration, control and optimization of voice AI systems
  • Experience in implementing your own voice AI projects is a great advantage
  • Basic technical knowledge of TypeScript, Python or similar languages is desirable
  • Leidenschaft für generative KI, Sprachmodelle und Voice-Technologien
  • Creative and analytical thinking to develop innovative AI interactions
  • Very good knowledge of German and English, both written and spoken

Benefits

  • Young company, 100% remote, great trust – ideal conditions if you want to grow professionally and personally, develop yourself and leave a mark on the path to success of a start-up company.
  • Be there when the real estate industry, one of the largest industries in the world, transforms into the digital age.
  • An international, helpful and motivated team that is looking forward to you and regular team events.
  • Inspiring company culture based on shared values such as drive, positivity, progress and “Deliver Wow”.
  • With “onpreo Flex” you decide for yourself where you work most effectively. Our remote working policy includes the ability to work from home or anywhere within the UK or the European Economic Area.

Become part of onpreo AG and shape the future of brokerage software. Apply now as a Prompt Engineer (m/f/d) – focus on Voice AI.

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