Senior Frontend React Developer

Please note: This role requires working from our office in Warsaw city centre 5 days a week. This is a fully on-site position, and remote or hybrid work is not available.About usWe believe that businesses are moving toward AI-powered work, and we are building a platform for this future.Many AI agents cannot handle complex business tasks. We created a platform that organizes company policies, workflows, and business knowledge into one AI data model. This helps AI agents make accurate decisions and deliver reliable results at scale.We already work with well-known enterprise customers such as Glovo, Nespresso, and HelloFresh.Our platform supports thousands of users and processes real production data. Customers trust us with important business knowledge because we provide a secure and reliable solution with SOC2, HIPAA-ready security practices, and strong integrations.Job descriptionWe are looking for a Senior Frontend Engineer who enjoys building high-quality user interfaces for enterprise AI products.In this role, you will design and build important frontend features, solve complex UI problems, and improve the user experience over time. You will take ownership of frontend architecture and help build production Next.js applications with complex state management, real-time AI features, and enterprise functionality.The position is based in Warsaw and requires working from the office.ResponsibilitiesDesign and build production Next.js applications that support complex state, high traffic, and real-time AI features.Create user interfaces for AI-powered tools, including streaming AI responses, semantic search, knowledge graphs, and AI agents.Build and improve our component library and design system to keep the user experience consistent, accessible, and reusable.Deliver enterprise features such as localization, accessibility, browser compatibility, and security.Monitor applications after release, improve performance, reduce bundle size, track Core Web Vitals, and help systems scale.Maintain high engineering standards through code reviews, testing, and mentoring other developers.RequirementsMore than 5 years of frontend development experience, including at least 3 years working with React and modern TypeScript.Strong experience building production applications with Next.js, including App Router, Server Components, and understanding SSR, SSG, and CSR.Experience managing complex application state, including real-time updates, optimistic UI, multi-tenant systems, and large amounts of data.Experience building AI or LLM-based interfaces such as chat applications, streaming responses, or semantic search.Strong knowledge of frontend performance and experience improving Core Web Vitals in large applications.Good understanding of accessibility, localization, security, and enterprise application standards.A security-focused approach and experience working with sensitive data.Strong product thinking and the ability to improve user experience without waiting for detailed designs.Experience using AI coding assistants as part of your daily development work.Good written and spoken communication skills and the ability to explain technical decisions clearly.Nice to haveExperience with React Flow, Highcharts, or other data visualization libraries.Experience building vector search, RAG, generative AI, or semantic search interfaces.Basic knowledge of Node.js or Python to understand backend code and APIs.Experience contributing to design systems or open-source UI libraries.What we offerB2B contract and company stock options.MacBook Pro.Modern technology stack and the opportunity to contribute to open-source projects.An AI-focused development environment with tools such as Claude Code, OpenAI Codex, and GitHub Copilot.Our valuesOur leadership team has strong experience in AI, knowledge management, and enterprise SaaS. We have received more than $60 million in funding and have been recognized by Gartner as a Cool Vendor.Our work is guided by these values:Quality – We care about excellent work and high standards in everything we build.Momentum – We take initiative, share ideas, and keep moving forward.Accountability – We take responsibility for our work and give honest, respectful feedback.Hard work – We believe success comes from teamwork, dedication, and consistent effort.Learning agility – We stay curious, learn from mistakes, and continue improving.Adapt and thrive – We welcome change and see challenges as opportunities to grow.Win together – We work as one team, communicate openly, and support our shared goals.