Senior Frontend Engineer (React)

Sourceangel; Warszawa; On-site; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Flexibility in work location

Competitive salary package

Medical insurance

Office in Warsaw

Job summary

Source Angel is building a greenfield frontend platform for a multinational automotive SaaS product. You will join a core product team to rebuild with modern frontend technologies and AI-first development principles.

You will work with React 18+, Tailwind or Material-UI, and state management tools while collaborating with backend, design and product teams to deliver scalable and performant user experiences. The role offers growth in a global, people-first culture.

Qualifications

• 5+ years of frontend development experience.
• Strong understanding of component-based architecture and frontend design patterns.
• Proficiency with TypeScript, React, and state management (Redux, Zustand, Recoil).
• Experience with REST/GraphQL integrations and API-driven applications.
• Good understanding of UX principles and responsive design.

Responsibilities

• Develop and maintain modern, high-performance web apps using React 18+.
• Design reusable UI components and responsive layouts with React, Tailwind, or Material-UI.
• Collaborate with backend, design and product teams to deliver seamless UX.
• Implement state management and optimize frontend performance.
• Integrate REST and GraphQL APIs and handle complex data flows.

Skills

Frontend development

React

TypeScript

REST/GraphQL

UI/UX

Tools

Docker

Kubernetes

CI/CD (GitHub Actions/GitLab)

Job description

We’re Source Angel, a Danish-rooted software company with development centers in Ukraine, Poland, and Romania. For over 8 years, we’ve been building dedicated tech teams for global clients, focusing on long-term partnerships and a people-first culture.

We foster an environment of respect, transparency, and professional growth, offering engineers freedom with responsibility, collaborative Scandinavian leadership, and an international mindset.

About the Project

You’ll join a newly formed core product team that is rebuilding a widely-used automotive SaaS platform from scratch using modern frontend technologies and AI-first development principles.

The platform serves 1,500+ car repair shops across Europe, covering everything from workshop management to integrations with finance, logistics, and more.

The client is part of a global software group (190+ companies in 34 countries), providing long-term stability, strategic support, and room for innovation, while maintaining autonomy in the local product strategy.

This is a long-term greenfield modernization project with a strong focus on scalability, UX excellence, performance, and modern architecture.

What You’ll Do

• Develop and maintain modern, high-performance web applications using React 18+
• Design reusable UI components and responsive layouts with React, Tailwind, or Material-UI
• Collaborate closely with backend, design, and product teams to deliver seamless user experiences
• Implement state management ( Redux, Zustand, or Recoil ) and optimize frontend performance
• Integrate REST and GraphQL APIs and handle complex data flows
• Ensure code quality through testing (Jest, React Testing Library, Cypress) and code reviews
• Participate in architecture decisions and contribute to frontend best practices
• Help shape the frontend development strategy and mentor other team members
• Framework: React 18+, React Router, Redux / Zustand / Recoil, RxJS (optional)
• APIs: REST, GraphQL
• Testing: Jest, React Testing Library, Cypress, Playwright
• CI/CD: GitHub Actions, GitLab CI
• Cloud/Infra: Docker, Kubernetes (OVH or managed cloud)
• Docs & PM: Jira, Confluence, Markdown

What We’re Looking For

• 5+ years of frontend development experience
• Strong understanding of component-based architecture and frontend design patterns
• Proficiency with TypeScript, React, and state management (Redux, Zustand, Recoil, or similar)
• Experience with REST/GraphQL integrations and API-driven applications
• Good understanding of UX principles and responsive design
• Familiarity with Docker, CI/CD pipelines , and agile workflows
• Experience with AI/ML integration or event-driven systems

Onboarding & Performance Expectations

First 30 Days

• Collaborate with the team to define architecture standards, CI/CD pipelines, and observability tooling
• Develop a functional microservice prototype following agreed design patterns and platform technologies

First 90 Days (to be refined together with the candidate based on strengths and focus areas)

• Take ownership of migrating one or more critical legacy services to the new architecture
• Share insights, technical recommendations, and improvement ideas based on hands-on experience

Ongoing Success Metrics

• Will be defined collaboratively with the candidate and reviewed regularly to ensure mutual alignment and growth

Why Join Us

• Work on a greenfield rebuild of a successful international platform
• Take ownership from day one in a flat, transparent environment
• Long-term opportunity with a stable, well-funded product
• Collaborate with an experienced and supportive multinational team
• Opportunity for future relocation to Denmark or other projects around the world

We Offer:

• Exciting projects with Denmark’s most dynamic clients
• We provide the necessary equipment for your work
• An attractive salary package matching your experience and responsibilities
• Office located centrally in Warsaw
• Flexible work location can be arranged in coordination with the team lead
• 20 days of paid vacation
• Paid sick leave
• Medical insurance
• Local Danish managers offering mentorship and helping you grow communication and interpersonal skills