Senior Software Engineer

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. Requirements: 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 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. You’ll go through a centralised hiring process that lets us get to know your skills and preferences, while you explore which team best aligns with your interests and expertise. At the end, we’ll match you with the team where you can have the most impact. We currently have multiple engineering roles open across different teams. Please apply to the one role that feels like the best match for your skills and experience . Our Talent team will review your application against all open positions. If we believe you may be a stronger fit for another role or team, we’ll ensure your application is considered there ... (truncated, view full listing at source)