Senior Full Stack Engineer - Data team (must be based in UK)

PolyAI builds enterprise voice assistants that have 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 judgement. As a result, our enterprise clients see improved customer satisfaction, employee retention and operational efficiency.

We are seeking an experienced Senior Full Stack Engineer with a strong backend focus to join our team and help shape our data processing pipelines and cutting-edge low-code platform. This role offers the opportunity to work end-to-end, from design to implementation, on creating features which enable a simple user experience for interacting with complex AI systems. This is an excellent opportunity for a technically proficient individual who is eager to learn and grow within a collaborative, fast-paced environment.

What You Will Do

• Full-Stack Development: Design and implement features end-to-end, using Python for backend services and React (Next.js preferred) for frontend interfaces.
• Create Intuitive Interfaces: Develop user-friendly UIs that simplify and visualise complex AI concepts.
• Champion Best Practices: Lead the team in adopting coding standards and best practices, ensuring a clean, maintainable, and scalable codebase.
• Collaborate: Work closely with cross-functional teams to design, develop, and deliver features that align with the platform’s vision.
• Mentor and Guide: Provide technical leadership and guidance to junior engineers, fostering a collaborative and growth-oriented environment.
• Optimise Performance: Improve backend workflows, streamline processes, and enhance overall system efficiency.

• Proven Expertise in Python and SQL: Extensive experience building backend systems, with a strong understanding of REST APIs. Experience with designing data schemas, building and maintaining data pipelines/ETLs (familiarity with event-driven processing is a plus).
• Frontend Proficiency: Strong experience with React and JavaScript (TypeScript preferred); experience with CSS-in-JS (e.g., styled-components).
• Agile Practitioner: Familiarity with Agile methodologies such as Kanban or Scrum.
• Testing Advocate: Experience writing and maintaining unit tests in Python and JavaScript (Jest).
• Version Control: Proficiency with Git for collaborative development.

Additional Skills (Desirable):

• Knowledge of Golang.
• Experience with Next.js.

Soft Skills: 

• Strong written and verbal communication in English, with a collaborative and mentoring mindset.

💰 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

📚 Annual learning and development allowance

🏡 One-off WFH allowance when you join

Company-funded fertility and family-forming programmes

Menopause care programme with Maven

🏥 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.