Middle Frontend Developer (React.js)

Masterborn 2; Wrocław; Remote; PLN 100,000 - 167,000; Full time

Benefits offered by this job

3,000 PLN annual training budget

Multisport

Luxmed

Cafeteria Platform

Tech‑talks

Learning sessions

Job summary

Masterborn is seeking a Frontend Developer to build and improve applications for US clients, focusing on TypeScript and React. You’ll contribute across the stack, prioritizing frontend delivery, accessibility, and performance.

You will work with AI-assisted development, participate in code reviews, and collaborate with designers, QA, and product owners in a dynamic, remote-friendly team.

Qualifications

• At least 2 years of commercial experience building and maintaining web applications.

Responsibilities

• Develop and maintain applications, owning well‑defined features from requirements through deployment and verification.

Skills

TypeScript

React

JavaScript

Frontend development

UI/UX

Node.js

Tools

Slack

Google Workspace

GitHub

Jira

Coda

FigJam

Job description

We’re looking for a Frontend Developer to build and improve applications for our US clients - from early-stage MVPs to established products in FinTech, SportsTech, MedTech, and other industries.

TypeScript, React, and Node.js are our bread and butter. We value strong application development fundamentals, engineering judgment, and the ability to learn the tools a project needs.

We’re building a team of engineers who can contribute across the application while developing deep expertise in frontend or backend engineering. In this role, frontend is your primary discipline, and you’ll broaden your contribution across the stack as your experience grows.

AI-assisted development is part of this role. You’ll use it to explore solutions, implement features, and improve your workflow, while taking responsibility for understanding, testing, and maintaining the code you ship.

• Rate: PLN 9.000 - 15.000 + VAT / month (B2B)
• Contract: B2B/UZL, no-service days, 100% remote (or hybrid/onsite-as you prefer), Polish time zone, flexible hours, full-time position, long‑term contract
• Perks and Benefits: 3,000 PLN annual training budget, Multisport, Luxmed, Cafeteria Platform, Tech‑talks, Learning sessions, and more
• Tools you’ll use: Apple MacBook Pro, Slack, Google Workspace, GitHub, Jira, Coda, FigJam, AI tools
• Develop and maintain applications, taking ownership of well‑defined features from understanding requirements through implementation, deployment, and verification
• Build responsive, accessible interfaces with attention to design details, performance, and user experience
• Implement straightforward backend changes within established application patterns, including APIs, business logic, and data handling, with review and support for unfamiliar or complex areas
• Understand how the interface, backend, and data fit together, and diagnose issues across those boundaries
• Use AI coding assistants in your daily work, providing clear context, critically reviewing generated code, and validating the results
• Write clean, maintainable code
• Choose and implement appropriate tests for application behaviour, including integration points and important user flows
• Follow features through deployment, verify their behaviour, and use logs and error monitoring to investigate issues
• Collaborate with designers, developers, QA, and product owners; discuss client needs and propose practical solutions
• Participate in code reviews, document important decisions, and share knowledge with the team
• At least 2 years of commercial experience building and maintaining web applications
• Strong JavaScript and TypeScript fundamentals, with a practical understanding of HTML, CSS, and browser behavior
• Experience delivering application features involving user interactions, forms, and API integration
• Experience organising frontend code into maintainable components, managing application state, and investigating accessibility and performance issues
• Understanding of HTTP, client–server communication, authentication, and error handling
• Experience with a modern frontend framework and the ability to transfer your knowledge between tools and codebases
• Confidence testing and debugging applications, including investigating unfamiliar code and understanding why a solution works
• Ability to implement straightforward backend changes within an existing application, such as an API endpoint, input validation, or data access, with review and support for unfamiliar or complex areas
• Practical experience using AI coding assistants: breaking work into clear tasks, evaluating their suggestions, and checking correctness through code review and testing
• Familiarity with Git, build tooling, and container‑based development environments
• Experience working with CI/CD workflows: running automated checks, investigating build and test failures, and deploying changes through an established pipeline
• Care about user needs and the business value of what you build
• Able to independently deliver well‑defined features, clarify ambiguity, and ask for support when needed
• Communicate progress, trade‑offs, and blockers clearly to teammates and clients
• You approach problems proactively, investigate causes, and propose solutions
• You welcome constructive feedback and share what you learn
• Open to working across frontend and backend and learning technologies beyond your current toolkit
• English at B2 or above for collaboration with international clients
• Polish at C1 for daily team communication
• Deeper backend experience with API design, database optimisation, or complex third‑party integrations
• Experience building CI/CD pipelines, automating infrastructure, or working with cloud services beyond routine application deployment
• Experience with mobile applications
• Interest in improving AI‑assisted development workflows, including working with coding agents and coordinating their tasks
• Experience working in Agile/Scrum teams or contributing to open‑source projects
• Understanding of MVP development and how to balance delivery speed, scope, and maintainability
• Decision and feedback