AI Full-Stack Product Engineer - Warsaw onstie

## About the project - We are looking for a AI Full-Stack Product Engineer to join a fast-growing company developing an AI-native enterprise platform. - The product enables companies to model their policies, workflows, and operational knowledge so that AI agents can reliably operate in complex business environments. - The platform is already used by well-known international enterprise customers, with tens of thousands of users and a strong focus on security, reliability, and enterprise integrations. - You will join a small, highly autonomous engineering team where developers have significant ownership and influence over the product. This role combines hands-on software engineering, product thinking, and AI-native development. ## This is how we work - at the client's site ## Your responsibilities - Build and deliver end-to-end product features across frontend and backend. - Develop high-quality user-facing experiences using React and TypeScript. - Design and implement APIs, backend logic, and data flows. - Translate ambiguous product requirements into practical and scalable technical solutions. - Work closely with Product and Design to shape and deliver new features. - Take ownership of features from problem discovery through development, release, and production support. - Improve product usability, performance, reliability, accessibility, and overall UX. - Make sensible decisions around scope, architecture, and technical trade-offs. - Instrument and monitor features to understand their behavior in production. - Maintain high standards of code quality, testing, security, and maintainability. - Use AI development tools such as Codex, Claude Code, and AI agents as part of your daily engineering workflow. - Contribute to improving internal engineering tools, workflows, and development practices. - Strong Mid/Senior-level experience building and shipping production web applications. - Strong experience with React and TypeScript or an equivalent modern web stack. - Solid backend development experience, including designing and implementing APIs, business logic, and data flows. - Experience with Node.js, Python, or both is a strong advantage. - Strong product mindset and ability to identify unnecessary complexity and improve user experiences. - Ability to work independently and make sound decisions when requirements are incomplete or ambiguous. - Experience taking ownership of features or product areas from concept to production. - Good understanding of software architecture, testing, performance, and production quality. - Security-conscious approach to software development, especially when working with sensitive data. - Strong communication skills and ability to collaborate effectively with Engineering, Product, and Design teams. - Practical experience using AI tools as part of everyday software development. - Willingness to work from the Warsaw office. ## Optional - Experience building AI-powered products, such as: - AI chat interfaces - AI search - recommendation systems - workflow automation - AI agents / agentic systems - Experience with Python and/or Node.js on the backend. - Experience owning product areas with limited supervision. - Strong knowledge of web performance and accessibility. - Experience working with complex enterprise applications. - Experience with observability, instrumentation, logs, traces, or developer tooling. ## SQUARE ONE RESOURCES sp. z o.o. - At Square One Poland we link IT experts with the business. With over 25 years of experience, we specialize in recruitment processes on a global scale. Despite years of experience, we still have a startup DNA and this is our advantage. Our offices are located in London and Warsaw, however, we can reach clients from all over the world, from start-ups to big worldwide corporations.