Founding Engineer | London | up to £120k

Founding Engineer | London | up to £120k

Location: Central London, hybrid

My client is a stealth voice-AI startup seeking a Founding Engineer to build technology that helps people through natural voice conversations.

This is a hands-on opportunity to work directly with the founders, own development from initial prototype through to production, and shape the product, architecture and engineering culture.

Key Responsibilities:

• Build and launch the company’s first voice-AI product.
• Develop conversational experiences using LLMs and speech technologies.
• Integrate speech-to-text, text-to-speech and real-time audio capabilities.
• Own development across backend services, user interfaces and infrastructure.
• Work closely with the founders to turn user needs into practical product features.
• Test and improve conversational quality, responsiveness and reliability.
• Gather user feedback and iterate, with a focus on accessibility for older adults.

Requirements:

• Strong hands-on software engineering experience.
• Experience building AI-powered applications using LLMs.
• Ability to own development from idea through to production.
• Confidence using AI coding tools to accelerate development.
• A resourceful approach to solving problems and working through ambiguity.
• Comfort working in an early-stage environment with evolving priorities.
• A strong interest in using voice technology to help older adults.
• Experience building voice agents or conversational AI systems.
• Experience with speech-to-text, text-to-speech, telephony or real-time audio.
• Familiarity with platforms such as LiveKit, Twilio, ElevenLabs or Deepgram.
• Full-stack development experience using Python, TypeScript or similar technologies.
• Cloud infrastructure and application deployment experience.
• Previous experience as a founding engineer or early startup hire.
• Experience developing accessible consumer or healthcare products.

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