PolyAI is hiring a

Senior Machine Learning Engineer

London, United Kingdom

Who we are:

PolyAI builds enterprise voice assistants that carry on natural conversations with customers to solve their problems. Our voice assistants understand customers, regardless of what they say or how they say it. We serve enterprises where customer conversation is an important part of doing business. Our customers include some of the leading names in banking, hospitality, insurance, retail, and telecommunications.

Our enterprise clients deploy PolyAI voice assistants to cut down on wait times and free up live staff to focus on calls requiring empathy and judgment. As a result, our enterprise clients see improved customer satisfaction, employee retention and operational efficiency.

Your responsibility will involve:

  • Building and improving text-to-speech solutions within real-time production systems
  • Leading productization of machine learning models and pipelines in a multi-tenant environment
  • Mentoring junior members of the team
  • Cooperate with the infrastructure team to deploy production-ready machine learning services
  • Optimize our machine learning service runtime, as well as performance


What you'll come with:

  • BS degree in Computer Science or a related technical field involving coding, or equivalent industry experience
  • 2+ years of commercial ML-oriented software development experience
  • Experience with text-to-speech models such as FastSpeech, VITS, Tacotron
  • Experience with professional software engineering best practices, such as coding standards, code reviews, source control, build processes, and testing
  • Experience with one or more cloud services: AWS, GCP, Azure.
  • Experience with one or more programming languages such as Python or Golang
  • Working proficiency in verbal and written English

We'd love it if you have:

  • 3-4 years of the commercial machine-learning experience
  • Experience with Docker/Kubernetes
  • Experience with speech-to-text models such as DeepSpeech, Conformer, Wav2Vec
  • Experience with Tensorflow, PyTorch, or JAX


💰 Participation in the company’s employee share options plan

🏝 25 days holiday, plus bank holidays

🏡 Flexible working from home policy plus a one-off WFH allowance when you join

🌎 Work from outside of the UK for up to 6 months each year

🧡 Enhanced parental leave

📚 Yearly learning budget

🚲 Bike2Work scheme

🏥 Private healthcare and dental cover, discounts on gym members and relaxation apps, and access to a range of mental health programs

Equal Opportunity Statement:

PolyAI is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All employment decisions at PolyAI will be based on the business needs without attention to ethnicity, religion, sexual orientation, gender identity, family or parental status, national origin, neurodiversity status or disability status.

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