Senior Frontend Engineer - B2B

Fresha; Warszawa; On-site; PLN 279,000 - 446,000; Part time

Benefits offered by this job

RSUs

Private healthcare

Competitive salary

Job summary

Fresha, a leading beauty and wellness platform in Warsaw, seeks a frontend engineer to own the core booking engine and ship user-facing features in React+TypeScript for millions of pros and clients.

You’ll leverage AI tools to accelerate delivery, work with a design system, write robust tests, and collaborate across Product, Design, Backend, and Infra to ship features in 6-week cycles.

Qualifications

• Deep experience building AI-augmented web apps with React/TypeScript.
• Strong knowledge of GraphQL and REST fundamentals.
• Experience with design systems and web performance best practices.
• Testing mindset with modern JS/TS testing frameworks.

Responsibilities

• Own and evolve the core booking & scheduling engine at Fresha.
• Build and ship features in React + TypeScript for millions of users.
• Own features end-to-end: discovery, design, implementation, testing, rollout.
• Collaborate with Product, Design, Backend, and Infrastructure teams.
• Write robust tests and contribute to CI/CD processes.

Skills

AI-Augmented Workflow

React

TypeScript

GraphQL

REST

Design Systems

Web performance

Testing mindset

CI/CD

AI tooling

Tools

React

TypeScript

GraphQL (Apollo or urql)

REST

Cypress

Jest

React Testing Library

CI/CD tooling

Job description

Location: Warsaw, Poland - Onsite (4 days/week)

Contract: B2B

• 25-40k PLN net /month + RSUs

Why Fresha & Why Now?

Fresha is re-imagining how the global beauty and wellness industry runs. 120k+ businesses, 450k+ professionals, millions of clients, and 1 billion+ appointments already rely on our platform for everything from bookings to payments.

Join us at a moment of rapid scale - your work will surface on screens around the world within days, not quarters.

What You’ll Do

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.

• Own and evolve our core booking & scheduling engine - the heartbeat of Fresha - ensuring it scales smoothly and delivers seamless experiences for millions.
• Design, build, and ship new user-facing features in React + TypeScript, reaching millions of professionals and clients.
• Own features end-to-end: discovery, technical design, implementation, testing, rollout, and observability.
• Tap into (and extend) our Design System to ship polished UI quickly while raising the bar for consistency.
• Write robust automated tests (Cypress, Jest, React Testing Library) and keep the CI/CD pipeline green.
• Partner closely with Product, Design, Backend, Infrastructure, and Mobile engineers to take features from discovery to rollout and beyond.
• Accelerate with AI: harness AI agents, LLM-powered coding tools, and access to a wide range of AI tools (e.g., chatbots, dev assistants).
• Curious about backend, DevOps, or mobile? Great – we’ll support you in exploring any part of the stack.

What We’re Looking For

• AI-Augmented Workflow: 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.
• Deep expertise in modern React & TypeScript, with a track record of shipping large-scale, consumer-facing web apps.
• Solid grasp of GraphQL (Apollo or urql) and REST fundamentals.
• Experience working with design systems.
• Fluency in web performance, cross-browser, and responsive design best practices.
• A testing mindset and familiarity with JS/TS testing frameworks.

Don’t meet every single requirement? Passion and potential matter more than perfect check-boxes.

Why You’ll Love It Here

• Direct impact & ownership - your decisions shape the product.
• Modern tech stack, continuous learning, and innovation.
• Competitive salary, equity, private healthcare, and more.

Our Technology Stack - Frontend Technologies

• React - Modern JavaScript UI library
• TypeScript - Strongly typed JavaScript
• React Router DOM - Client-side routing
• React Redux - State management
• Zustand - Lightweight state management
• Formik - Form management

Build Tools & Bundlers

• Rsbuild - Modern build tool (Rspack-based)
• esbuild - Fast JavaScript bundler
• Turbo - High-performance build system
• SWC - Rust-based JavaScript compiler

UI & Design System

• Fresha Design System - Custom design system
• Sass/SCSS - CSS preprocessor
• PostCSS - CSS transformation
• Lottie - Animations

State Management & Data Fetching

• Redux with Redux Actions
• URQL - GraphQL client

Backend Communication

• GraphQL - API query language
• GraphQL Code Generator - Type-safe GraphQL
• Phoenix - Real-time WebSocket channels
• WebSocket & Server-Sent Events support

Backend Technologies

• Node.js
• TypeScript
• Elixir
• Ruby on Rails
• PostgreSQL
• Redis
• Docker
• Kubernetes
• NginxAWS

Testing Framework

• Jest - Unit testing
• Cypress - Component and integration testing
• Testing Library - React testing utilities
• MSW - API mocking

Code Quality & Linting

• ESLint - JavaScript linting
• TypeScript strict mode

Development Tools

• Storybook - Component documentation
• Happo - Visual regression testing

Mobile Development

• Capacitor - Native mobile app wrapper
• iOS & Android - Native mobile platforms

CI/CD & DevOps

• GitHub Actions - Continuous integration
• AWS - Cloud infrastructure
• Datadog - Monitoring and analytics

Monitoring & Analytics

• Sentry - Error tracking
• Amplitude - User analytics
• Unleash - Feature flags

Date & Time

• date-fns - Date manipulation
• moment - Date handling (legacy)

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.