Researcher, Post-Training in City of London

Job description

MetaVoice is building AI for voice conversations that feels just like talking to a human.

Voice AI today cannot hold real conversations. It requires walkie-talkie style turns, lacks empathy and has an inconsistent personality.

Developers are unable to build long-form experiences out of the box and users disengage. This limits voice AI to simple receptionist tasks and basic customer support, blocking high-value use cases (therapy, coaching, sales) where fluid dialogue and emotional intelligence matter most.

Scaling current tech will not solve this.

Our solution is a duplex speech-to-speech AI for developers, designed to feel just like talking to a human.

Who we are

MetaVoice was founded by:

• Sid, founding engineer at Wayve.ai (raised $1Bn+)
• Vatsal, co-created Alexa’s first deep learning voice.

We’re a small mission-driven team obsessed with making voice the most natural way to interact with AI. We’re backed by top tier US and European VCs and angels including co-founder of Wayve.ai, ex-VP of Twitter, ex-CTO of CoinBase

Requirements & Experience

• PhD in ML or related field, with publications in top conferences.
• 1+ yrs of experience in training LLM / diffusion / flow-matching on 1B+ param models OR training SOTA speech models.
• Experience with post-training data curation & supervised fine-tuning of pre-trained models.
• Experience designing & building evaluation workflows: automated or human-in-the-loop.
• [bonus] Early-stage startup experience.

What we offer

• Change the world (when we succeed)
• Environment to do the best work of your life.
• Talent dense team, great people.
• Opportunity to make cutting-edge research work from scratch for production scenarios.
• Work with 100+ TBs of data and 10B+ parameter models.

Culture

• We're building an in-person team in London. We love working together – it helps us learn from one another and move faster.
• We ship fast & obsess over making customers happy.
• We offer high autonomy, allowing everyone to do their best work.

Compensation & Benefits

• Significant equity as a founding team member.
• £100K-£150K base.
• Fully covered medical, dental, and vision insurance.
• Immigration support, we are immigrants ourselves.

Interview Process

We move with speed, and aim to go from first interview to offer within a week.

• Short 15 mins chat with one of the founders
• 2 technical interviews
• 2x culture interview with co-founders
• Paid “work together” session
• Offer

Extra information

Status

Open

Education Level

Secondary School

Location

City of London

Type of Contract

Part-time jobs

Published at

09-09-2025

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English