Senior Frontend Engineer - B2B

Fresha; Warszawa; Hybrid; PLN 279,000 - 446,000; Full time

Benefits offered by this job

ESOPs

Job summary

Fresha in Warsaw is seeking an AI-augmented Frontend Engineer to own and evolve the core booking and scheduling engine, delivering scalable, consumer-facing features in React + TypeScript.

You will collaborate across Product, Design, Backend, and Infra, build with the Fresha Design System, write tests with Cypress/Jest, and explore AI tools to accelerate delivery; onsite four days a week.

Qualifications

• Extensive experience with React and TypeScript.
• Experience shipping large-scale consumer web apps.
• Knowledge of GraphQL (Apollo/URQL) and REST fundamentals.
• Experience with design systems.
• Strong web performance, cross-browser, responsive design.
• Testing with JS/TS frameworks.

Responsibilities

• Own and evolve core booking & scheduling engine.
• Design, build, and ship new features in React + TypeScript.
• Own end-to-end features: discovery, design, implementation, testing, rollout, observability.
• Contribute to Fresha Design System for consistent UI.
• Write robust tests (Cypress, Jest, RTL) and keep CI/CD green.
• Collaborate with Product, Design, Backend, Infra, and Mobile teams.

Skills

AI-augmented workflow

React & TS

GraphQL

Design systems

Web performance

Testing mindset

Tools

React Router DOM

Redux

URQL

Formik

Cypress

Jest

Job description

Location: Warsaw, Poland - Onsite (4 days/week)
Contract: B2B · 25-40k PLN net /month + ESOPs

About Fresha

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.

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.

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.

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.

We’re continuing to scale rapidly across markets, teams and products, making this an exciting time to join us.

What You’ll Do

• * 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 modernReact & TypeScript, with a track record of shipping large-scale, consumer-facing web apps.

• Solid grasp ofGraphQL(Apollo or urql) and REST fundamentals.

• Experience working withdesign systems.

• Fluency inweb performance, cross-browser, and responsive designbest 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. If this role excites you, apply today and grow with us!

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

• Reduxwith 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 Eventssupport

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

• TypeScriptstrict 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.