Senior Voice AI Engineer - Contract (Outside IR35) | £350-500/day | 3-4 months | Remote We''re looking for a hands-on engineer to take an existing voice AI proof-of-concept and turn it into a reliable, production-grade system ready for real users.The prototype works - but it now needs to be made fast, stable, scalable, and cost-efficient.What you''ll be doing:- Productionising a voice AI system from an existing PoC- Working with voice platforms such as ElevenLabs/Deepgram (or similar)- Improving Real Time performance and reducing latency- Designing lightweight orchestration (simple, deterministic flows over complex prompt chains)- Integrating customer/internal data using RAG approaches- Optimising cost, reliability, and system efficiency- Building and maintaining API/SDK-based voice pipelines- Supporting secure handling of sensitive/PII dataWhat we''re looking for:- Strong experience building voice AI or Real Time speech systems- Hands-on experience with speech-to-text and text-to-speech APIs- Proven ability to deliver production-grade AI systems- Good understanding of latency and performance optimisation- Experience with RAG and data-driven AI architectures- Strong API integration skills and practical engineering mindset- Comfortable working with sensitive data in production contextsIf this sounds like a strong fit, drop me a message.Oscar Associates (UK) Limited is acting as an Employment Business in relation to this vacancy. To understand more about what we do with your da