Senior Frontend Developer (React + React Native)

HeadHR; Warszawa; Hybrid; PLN 140,000 - 230,000; Full time

Benefits offered by this job

Private medical care

Life insurance

Remote work

Flexible hours

Training budget

International environment

Job summary

HeadHR in Warszawa is seeking an experienced frontend engineer to design and implement advanced user interfaces using React and React Native. You will design reusable components and collaborate with backend teams, UX/UI designers, and product owners to deliver high-quality solutions.

You will optimize performance, participate in architecture decisions, and contribute to a culture of testing and code quality. Strong English and strong front-end fundamentals are required.

Qualifications

• Minimum 5 years of experience developing web apps with React.
• Minimum 3 years of experience in developing mobile apps with React Native.
• Strong knowledge of JavaScript (ES6+), HTML5 and CSS3.
• Experience with Redux or other state management tools.
• Familiarity with Git and CI/CD processes.
• Ability to write unit and integration tests with Jest, Enzyme, or Testing Library.
• Experience with RESTful APIs and GraphQL.
• Knowledge of frontend security best practices.
• Experience in Agile/Scrum environments.
• Excellent communication and interpersonal skills.
• Fluent English, minimum B2 level.

Responsibilities

• Designing and implementing advanced user interfaces using React and React Native.
• Creating and maintaining reusable components and frontend libraries.
• Close collaboration with backend teams, UX/UI designers, and product owners to deliver high-quality solutions.
• Optimizing applications for performance and scalability.
• Conducting code reviews and mentoring junior team members.
• Participating in planning system architecture and technology selection.

Skills

React

React Native

JavaScript ES6+

HTML5

CSS3

Redux

Git

Jest

Testing Library

REST APIs

GraphQL

Frontend security

Agile

Scrum

English B2

TypeScript

Vue.js

Angular

Tools

React

React Native

Redux

Git

Jest

Testing Library

Lighthouse

Sentry

GraphQL

CI/CD tools

Job description

Requirements:

• Minimum 5 years of experience in creating web applications using React,
• Minimum 3 years of experience in creating mobile applications using React Native,
• Excellent knowledge of JavaScript (ES6+), HTML5, and CSS3,
• Experience with Redux or other state management tools,
• Familiarity with CI/CD tools and experience working with version control systems (Git),
• Ability to write unit and integration tests (Jest, Enzyme, Testing Library),
• Experience with integrating RESTful APIs and GraphQL,
• Knowledge of best practices related to frontend application security,
• Ability to work in agile methodologies (Agile, Scrum),
• Very good communication and interpersonal skills,
• Fluent in English (minimum B2 level).

Additional advantages:

Experience with TypeScript,

Knowledge of other frontend frameworks and libraries (Vue.js, Angular),

Experience in conducting technical training and workshops,

Familiarity with tools for analyzing and monitoring application performance (e.g. Lighthouse, Sentry).

Kogo poszukujemy?

Responsibilities:

• Designing and implementing advanced user interfaces using React and React Native,
• Creating and maintaining reusable components and frontend libraries,
• Close collaboration with backend teams, UX/UI designers, and product owners to deliver high-quality solutions,
• Optimizing applications for performance and scalability,
• Conducting code reviews and mentoring junior team members,
• Participating in planning system architecture and technology selection.

We offer:

Attractive salary and bonus system,

Possibility of remote work and flexible working hours,

Private medical care and life insurance,

Access to the latest technologies and tools,

Budget for training, conferences, and professional development,

Friendly and supportive work atmosphere in an international environment,

Modern offices in convenient locations.