Machine Learning Engineer – Roleplay Sessions

About the role

Synthesia’s Roleplay Sessions is a training tool that lets learners practice real conversations with AI avatars, receiving instant feedback on performance. As a Machine Learning Engineer you will build the AI engine that powers this coaching, creating models that listen, score, generate feedback, and drive avatar responses in real time.

Key responsibilities

• Design, develop, and maintain ML models that process learner speech, evaluate performance, and generate real‑time feedback.
• Integrate models into the Roleplay Sessions product pipeline ensuring low‑latency inference.
• Collaborate with product and engineering teams to iterate quickly and deliver new features.
• Monitor model performance, conduct A/B testing, and continuously improve based on data.

Required profile

• Ability to apply machine learning knowledge to solve real product problems.
• At least seven years of software engineering experience, with a minimum of two years at a senior level.
• Experience working in high‑performing engineering teams operating at scale.
• Strong commercial orientation and bias towards action.
• Comfort with fast iteration and pragmatic problem‑solving.

What we offer

• Competitive base salary of £120,000 per year plus RSU equity.
• 25 days of annual leave plus local holidays.
• Opportunity to work on cutting‑edge generative AI technology in a fast‑growing company.
• Collaborative culture focused on building, not endless meetings.