Voice AI Engineer
About this role
Intro
For this position we are only looking for candidates located in Greece, Germany or Austria.
Nairon GmbH is a Swiss startup building AI voice agents that answer and make phone calls for businesses. Our platform runs real-time conversations over the phone and on the web, connected to our customers' telephony and business tools. We value clear communication, thoughtful engineering, and a collaborative approach to problem-solving. Join us as we continue to develop tools that make a difference.
Tasks
As a Voice AI Engineer at Nairon GmbH, you will make our agents sound fast, natural and reliable in live calls. Your responsibilities will include:
Improving turn-taking: when the agent speaks, waits, yields or gets interrupted, including voice activity and end-of-turn detection.
Cutting end-to-end latency across speech recognition, language models and speech synthesis, and making provider failover seamless.
Optimising how we use LLMs in conversation: prompting, tool calls, streaming and speculative or parallel requests.
Serving our own speech models (STT and TTS) on GPUs, measuring throughput and time to first audio.
Fine-tuning speech and language models for our customers' languages and voices.
Building evaluation: test calls, benchmarks and quality metrics that tell us when a change really helps.
Requirements
- A senior or strong mid-level engineer with production experience in real-time audio, conversational AI or ML model serving.
- Technical Skills:
- Strong Python, including asyncio and streaming pipelines.
- Hands-on work with speech (STT, TTS, VAD) and LLM APIs in latency-sensitive systems.
- Model serving on GPUs, for example with vLLM or similar, and the basics of batching and memory limits.
Nice to have
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