Middle Frontend Developer (React.js)

masterborn-2; United States; Remote; USD 27,000 - 44,000; Full time

Benefits offered by this job

Multisport

Private medical care

Education budget

MacBook Pro

Flexible hours in Polish time zone

Job summary

masterborn-2 is seeking a mid-level frontend developer to join a team building web applications for US-based clients across FinTech, SportsTech, MedTech and other sectors. The stack centers on React, Node.js and TypeScript, with a remote-first setup operating in the Polish time zone.

You will write clean, maintainable code, understand each product’s domain, contribute to frontend design decisions, discuss trade-offs with the team, and participate in client meetings to gather requirements and

Qualifications

• Two+ years hands-on React experience, including dashboards or custom solutions.

Responsibilities

• Write clean, maintainable code following current best practices.
• Develop understanding of each product's domain and translate to technical decisions.
• Contribute to frontend design improvements and discuss implementation trade-offs.
• Participate in client meetings, gather requirements, and propose solutions with the team.
• Diagnose issues, share insights, and conduct peer code reviews.
• Support other developers by sharing knowledge and suggesting better approaches.

Skills

React

TypeScript

Next.js

TanStack Start

Docker

Webpack/Babel

REST API

React Query

JavaScript

AI coding tools

Tools

Docker containers

Webpack

Babel

Job description

Role overview

A mid-level frontend developer is needed to join a team building web applications for US-based clients across FinTech, SportsTech, MedTech, and other sectors. The work spans early-stage MVPs through mature products, with a stack centered on React, Node.js, and TypeScript and a remote-first setup operating within the Polish time zone.

Responsibilities

• Write clean, maintainable code following current best practices.
• Develop a working understanding of each product's business domain and translate that into technical decisions.
• Contribute to product design improvements from a frontend perspective and discuss implementation trade-offs.
• Participate in client meetings, gather requirements, and propose solutions in collaboration with the team.
• Diagnose issues, share insights, and conduct peer code reviews.
• Support other developers by sharing knowledge and suggesting better approaches.

Requirements

• At least two years of hands-on React experience, including complex dashboards or custom solutions.
• Working knowledge of React-based frameworks such as Next.js or Tanstack Start, TypeScript, and Docker containers.
• Practical experience configuring Webpack, Babel, or similar build tools.
• Experience testing React applications.
• Familiarity with REST APIs and modern data-fetching tools such as React Query.
• Solid grasp of modern JavaScript, including its strengths and pitfalls.
• Hands-on use of AI coding tools (for example Claude Code, Cursor, or Zed), with the ability to critically review AI-generated work.
• English at B2 level for US client communication and Polish at C1 for internal collaboration.

Nice to have

• Curiosity about new frontend libraries and tools, including AI-assisted software development lifecycles and agent orchestration.
• Familiarity with Scrum or other Agile methodologies and a sense of what matters most when building MVPs.
• Open-source contributions.

Benefits and work setup

• B2B contract at 9,000–15,000 PLN + VAT per month.
• Fully remote or hybrid/onsite flexibility, with flexible hours in the Polish time zone.
• Multisport, private medical care, a cafeteria platform, and an education budget for learning.
• Apple MacBook Pro plus standard tooling such as Slack, GitHub, Jira, Coda, and FigJam.