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onpreo

Prompt Engineer – Voice AI Focus

onpreo

Developing and optimizing prompts for generative AI models in the Voice AI sector. Engaging in continuous improvement and integration of Voice AI systems within a dynamic team.

Posted 5/16/2026full-timeRemote • 🇩🇪 GermanyMid-LevelSeniorWebsite

Tech Stack

Tools & technologies
PythonTypeScript

About the role

Key responsibilities & impact
  • Develop and optimize prompts for generative AI models, with a particular focus on Voice AI
  • Conduct tests to improve model performance, accuracy, and relevance of outputs
  • Fine-tune and automate prompt workflows to increase efficiency and consistency
  • Analyze usage data and model outputs to enable continuous improvements and data-driven decisions
  • Integrate and tune Voice AI systems using platforms such as fonio, vapi ai, retell ai, ElevenLabs, or Deepgram
  • Develop, train, and maintain in-house Voice AI prototypes and workflows
  • Monitor current trends and technical developments in generative AI, prompt engineering, and speech models to evolve internal strategies

Requirements

What you’ll need
  • Experience working with Voice and AI platforms such as fonio, vapi ai, retell ai, ElevenLabs, Deepgram, or comparable tools
  • Knowledge of integrating, operating, and optimizing voice AI systems
  • Hands-on experience delivering Voice AI projects is a strong advantage
  • Basic technical knowledge of TypeScript, Python, or similar languages is desirable
  • Passion for generative AI, language models, and voice technologies
  • Creative and analytical thinking to design innovative AI-driven interactions
  • Excellent German and English skills, both written and spoken

Benefits

Comp & perks
  • Young company, 100% remote, high level of trust — ideal conditions if you want to grow professionally and personally, develop yourself, and leave your mark on a fast-scaling company’s success
  • Be part of the digital transformation of the real estate industry, one of the largest sectors worldwide
  • An international, helpful, and motivated team that looks forward to welcoming you and regular team events
  • Inspiring company culture built on shared values such as drive, positivity, progress, and “Deliver Wow”
  • With “onpreo Flex” you decide where you work most effectively
  • Our remote work policy includes the option to work from home or from any location within the United Kingdom or the European Economic Area

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
prompt engineeringVoice AITypeScriptPythonmodel performance optimizationdata analysisworkflow automationAI project deliverygenerative AIspeech models
Soft Skills
creative thinkinganalytical thinkingcommunication skillsproblem-solvingteam collaborationadaptabilityattention to detaildata-driven decision makinginnovationpassion for technology