Senior Software Engineer

We're looking for talented Senior Software Engineers to join one of our three high impact teams: Runtime, Data, and Product Engineering. All three teams work closely together, share high engineering standards, and solve challenging technical problems at scale, but each has its own mission and area of focus.

• Runtime: own the global infrastructure that powers real-time voice interactions. In this role, you'll work at the core of the agentic process - streaming audio, transcribing speech, using LLMs and acting on their output, and synthesising natural voice. You'll design and optimise systems across VoIP, WebRTC to deliver low-latency, secure, and reliable conversations. Your work directly shapes the user experience of every call, driving down response times, improving comprehension, and ensuring we meet strict SLAs for performance and security.
• Data: play a key role in delivering the next generation of our no-code agent studio platform. In this role, you'll be leading the design and development of features that power insight generation, reporting, and the data-driven backbone of our no-code platform for building voice assistants.
• Product Engineering: help shape our 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.

Do you have experience in VoIP?, Do you have a Master's degree?, * 3+ years programming experience in a software engineering role, with strong proficiency in Python

• Hands-on experience in designing, deploying, and maintaining RESTful APIs
• Experience with professional software engineering best practices, such as coding standards, code reviews, source control, build processes, and testing
• Understanding of algorithms, data structures, system design and complexity analysis
• Bachelor's degree or Master's in Computer Science, Engineering, a relevant technical field or equivalent practical experience
• Proficiency in verbal and written English communication

Pulled from the full job description

• Employee discount
• Sabbatical
• Employee assistance programme
• Private medical insurance
• Work from home
• Discounted gym membership, We offer competitive compensation based on experience, expertise, and the level of responsibility. This role also includes equity, giving you the opportunity to share in the long-term success of the business. The listed expectations reflect what we're hiring for, so we encourage you to review the job description carefully., Participation in the company's employee share options plan

Tenure-Based PTO: You will receive 25 holidays when you join and will gain an additional 1 day after 2 years of service, then 1 day each year until capped at 32 holidays

Flexible working from home policy

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

TELUS Health EAP 24/7 - offers you and your chosen family confidential, judgment-free support for any work, health, or life challenge

Enhanced parental leave

Bike2Work scheme

Annual learning and development allowance

We're all about making WFH work for you - that's why we offer a one-off WFH allowance when you join. Offering perks like noise-cancelling headphones or a comfortable desk chair to boost your comfort and focus!

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

PolyAI automates customer service through lifelike voice assistants that let customers lead a conversation. Our voice assistants make it possible for businesses to deliver outstanding customer service that rivals their human agents. Our customers, which include the world's leading logos, are expanding how they use our platform, driving automation of critical customer service operations and integrating PolyAI into their daily customer service workflows. PolyAI automates customer service through lifelike voice assistants that let customers lead a conversation. Our voice assistants make it possible for businesses to deliver outstanding customer service that rivals their human agents. Our customers, which include the world's leading logos, are expanding how they use our platform, driving automation of critical customer service operations and integrating PolyAI into their daily customer service workflows. Depending on team, responsibilities can include: * Building reliable APIs for interacting with the runtime of our Voice Agent deployments. * Deploying state-of-the-art speech-to-text, LLMs and text-to-speech models * Taking a major role in our software development, through writing code, tests, as well as contributing to design ideas, documents and performing code reviews. * Contributing to the implementation of our multi-tenant infrastructure., At PolyAI, we take great pride in our values - they guide everything we do. We believe that a strong culture leads to meaningful work and lasting impact. Our core values are: Only the best We expect the best from our people, we hire people that expect the best from themselves, and we nurture this drive for excellence. Ownership We care deeply about what we do. We take ownership of our initiatives, decisions and outcomes. Relentlessly improve We demand more from ourselves and are always evolving. Continuous, obsessive improvement is the only way we will transform the world of conversational AI. Bias for action Our world moves quickly and so do we. We take calculated risks and we deliver impact fast. Disagree and commit We are all working toward the same goal. If we don't agree with something, we work hard to understand it and when a decision is made, we accept it and give it our all. Build for people We want the world to enjoy the experiences they have with us. We are building for a future that prefers automation. 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.