Senior Frontend Engineer - B2B.

<div><h5><strong>Location:</strong><span> Warsaw, Poland - Onsite (4 days/week)</span><br><strong>Contract:</strong><span> B2B · 25-40 k PLN net / month + ESOPs</span></h5></div><h5><span><strong id="docs-internal-guid-c1870f6f-7fff-5376-2c18-a30b432fdf9a">About Fresha</strong></span></h5><p><span>Fresha is the leading AI-powered operating system for the global beauty and wellness industry, giving businesses everything they need to run smarter, grow faster and build stronger client relationships.</span></p><p><span>In May 2026, Fresha secured an $80M growth investment from KKR at a valuation of $1B, officially reaching unicorn status and bringing total funding raised to $285M. Already profitable, Fresha is using this investment to accelerate global expansion and drive the next generation of AI and product innovation.</span></p><p><span>Today, Fresha operates at global scale, with offices across Europe, North America, the Middle East and Asia Pacific. Our platform is trusted by 130,000+ beauty and wellness businesses across 120 countries, with more than 1.5 billion appointments booked to date.</span></p><p><span>Our mission is simple: help beauty and wellness businesses grow by giving them the technology they need to attract clients, manage their operations and run their business in one place.</span></p><p><span>We’re continuing to scale rapidly across markets, teams and products, making this an exciting time to join us.</span></p><div><p><span><strong>What You’ll Do</strong></span></p></div><div><p></p></div><div><p>At Fresha, we believe AI is a force multiplier for feature delivery, not just a coding assistant. We provide every engineer with top-tier tooling (Claude, GitHub Copilot, Cursor) to strip away technical toil—so you can focus your energy on shipping high-impact product features. We value engineers who know how to leverage these tools to drive momentum within our 6-week cycles, accelerating the journey from concept to code while maintaining the deep technical judgment to verify, secure, and own the final user experience.</p></div><div><p></p></div><div><p><span>* Own and evolve our </span><strong>core booking &amp; scheduling engine</strong><span> - the heartbeat of Fresha - ensuring it scales smoothly and delivers seamless experiences for millions.</span></p></div><div><p><span>* Design, build, and ship new user-facing features in </span><strong>React + TypeScript</strong><span>, reaching millions of professionals and clients.</span></p></div><div><p><span>* Own features end-to-end: discovery, technical design, implementation, testing, rollout, and observability.</span></p></div><div><p><span>* Tap into (and extend) our </span><strong>Design System</strong><span> to ship polished UI quickly while raising the bar for consistency.</span></p></div><div><p><span>* Write robust automated tests (Cypress, Jest, React Testing Library) and keep the CI/CD pipeline green.</span></p></div><div><p><span>* Partner closely with Product, Design, Backend, Infrastructure, and Mobile engineers to take features from discovery to rollout and beyond.</span></p></div><div><p><span>* Accelerate with AI: harness AI agents, LLM-powered coding tools, and access to a wide range of AI tools (e.g., chatbots, dev assistants).</span></p></div><div><p><span>* Curious about backend, DevOps, or mobile? Great - we’ll support you in exploring any part of the stack.</span><br></p></div><div><div><p><strong>What We’re Looking For</strong></p><div><div><ul><li><p><strong>AI-Augmented Workflow:</strong><span><strong> </strong></span>You have deep experience building and interacting with AI agents, using them to amplify your output to 5x that of manual coding. You are able to integrate agents into our workflow while strictly adhering to our architecture and security standards, taking full accountability for ensuring all generated code meets the quality expectations of a Senior Engineer.</p></li><li><p>Deep expertise in modern<span> </span><strong>React &amp; TypeScript</strong>, with a track record of shipping large-scale, consumer-facing web apps.</p></li><li><p>Solid grasp of<span> </span><strong>GraphQL</strong><span> </span>(Apollo or urql) and REST fundamentals.</p></li><li><p>Experience working with<span> </span><strong>design systems</strong>.</p></li><li><p>Fluency in<span> </span><strong>web performance, cross-browser, and responsive design</strong><span> </span>best practices.</p></li><li><p>A testing mindset and familiarity with JS/TS testing frameworks.</p></li></ul><div><p></p></div><div><p>Don’t meet every single requirement? Passion and potential matter more than perfect check-boxes. If this role excites you, apply today and grow with us!<br></p></div></div></div></div></div><div><div><p><strong>Why You’ll Love It Here</strong></p><div><div><ul><li><p><strong>Direct impact &amp; ownership</strong><span> </span>- your decisions shape the product.</p></li><li><p>Modern tech stack, continuous learning, and innovation.</p></li><li><p>Competitive salary, equity, private healthcare, and more.<br></p></li></ul></div></div></div></div><div><div><p><strong>Our Technology Stack - Frontend Technologies</strong></p><div><div><ul><li><p><strong>React</strong><span> </span>- Modern JavaScript UI library</p></li><li><p><strong>TypeScript</strong><span> </span>- Strongly typed JavaScript</p></li><li><p><strong>React Router DOM</strong><span> </span>- Client-side routing</p></li><li><p><strong>React Redux</strong><span> </span>- State management</p></li><li><p><strong>Zustand</strong><span> </span>- Lightweight state management</p></li><li><p><strong>Formik</strong><span> </span>- Form management<br></p></li></ul></div></div></div></div><div><div><p><strong>Build Tools &amp; Bundlers</strong></p><div><div><ul><li><p><strong>Rsbuild</strong><span> </span>- Modern build tool (Rspack-based)</p></li><li><p><strong>esbuild</strong><span> </span>- Fast JavaScript bundler</p></li><li><p><strong>Turbo</strong><span> </span>- High-performance build system</p></li><li><p><strong>SWC</strong><span> </span>- Rust-based JavaScript compiler<br></p></li></ul></div></div></div></div><div><div><p><strong>UI &amp; Design System</strong></p><div><div><ul><li><p><strong>Fresha Design System</strong><span> </span>- Custom design system</p></li><li><p><strong>Sass/SCSS</strong><span> </span>- CSS preprocessor</p></li><li><p><strong>PostCSS</strong><span> </span>- CSS transformation</p></li><li><p><strong>Lottie</strong><span> </span>- Animations</p></li></ul><p></p></div></div></div></div><div><div><p><strong>State Management &amp; Data Fetching</strong></p><div><div><ul><li><p><strong>Redux</strong><span> </span>with Redux Actions</p></li><li><p><strong>URQL</strong><span> </span>- GraphQL client</p></li></ul><p></p></div></div></div></div><div><div><p><strong>Backend Communication</strong></p><div><div><ul><li><p><strong>GraphQL</strong><span> </span>- API query language</p></li><li><p><strong>GraphQL Code Generator</strong><span> </span>- Type-safe GraphQL</p></li><li><p><strong>Phoenix</strong><span> </span>- Real-time WebSocket channels</p></li><li><p><strong>WebSocket &amp; Server-Sent Events</strong><span> </span>support</p></li></ul><p></p></div></div></div></div><div><div><p><strong>Backend Technologies</strong></p><div><div><ul><li><p><strong>Node.js</strong></p></li><li><p><strong>TypeScript</strong></p></li><li><p><strong>Elixir</strong></p></li><li><p><strong>Ruby on Rails</strong></p></li><li><p><strong>PostgreSQL</strong></p></li><li><p><strong>Redis</strong></p></li><li><p><strong>Docker</strong></p></li><li><p><strong>Kubernetes</strong></p></li><li><p><strong>NginxAWS</strong></p></li></ul><p></p></div></div></div></div><div><div><p><strong>Testing Framework</strong></p><div><div><ul><li><p><strong>Jest</strong><span> </span>- Unit testing</p></li><li><p><strong>Cypress</strong><span> </span>- Component and integration testing</p></li><li><p><strong>Testing Library</strong><span> </span>- React testing utilities</p></li><li><p><strong>MSW</strong><span> </span>- API mocking</p></li></ul><p></p></div></div></div></div><div><div><p><strong>Code Quality &amp; Linting</strong></p><div><div><ul><li><p><strong>ESLint</strong><span> </span>- JavaScript linting</p></li><li><p><strong>TypeScript</strong><span> </span>strict mode</p></li></ul><p></p></div></div></div></div><div><div><p><strong>Development Tools</strong></p><div><div><ul><li><p><strong>Storybook</strong><span> </span>- Component documentation</p></li><li><p><strong>Happo</strong><span> </span>- Visual regression testing</p></li></ul><p></p></div></div></div></div><div><div><p><strong>Mobile Development</strong></p><div><div><ul><li><p><strong>Capacitor</strong><span> </span>- Native mobile app wrapper</p></li><li><p><strong>iOS &amp; Android</strong><span> </span>- Native mobile platforms</p></li></ul><p></p></div></div></div></div><div><div><p><strong>CI/CD &amp; DevOps</strong></p><div><div><ul><li><p><strong>GitHub Actions</strong><span> </span>- Continuous integration</p></li><li><p><strong>AWS</strong><span> </span>- Cloud infrastructure</p></li><li><p><strong>Datadog</strong><span> </span>- Monitoring and analytics</p></li></ul><p></p></div></div></div></div><div><div><p><strong>Monitoring &amp; Analytics</strong></p><div><div><ul><li><p><strong>Sentry</strong><span> </span>- Error tracking</p></li><li><p><strong>Amplitude</strong><span> </span>- User analytics</p></li><li><p><strong>Unleash</strong><span> </span>- Feature flags</p></li></ul><p></p></div></div></div></div><div><div><p><strong>Date &amp; Time</strong></p><div><div><ul><li><p><strong>date-fns</strong><span> </span>- Date manipulation</p></li><li><p><strong>moment</strong><span> </span>- Date handling (legacy)</p></li></ul><p></p></div></div></div></div><div><div><p>We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.</p></div></div>