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