Frontend Developer - Freelancer

Lingarogroup; Poland; On-site; PLN 140,000 - 200,000; Full time

Job summary

Lingarogroup is seeking an experienced Frontend Developer to design, build and maintain React/Next.js applications. You will ensure performance, quality, and responsiveness while collaborating with cross-functional teams in an agile setup.

The role requires 5+ years of professional experience, strong JavaScript/TypeScript skills, and proficiency with semantic HTML and modern CSS tooling. English at B2+ is expected.

Qualifications

• 5+ years of professional experience.
• Excellent communication skills.
• Strong ownership of assigned tasks, self-driven and proactive.
• Proficiency in JavaScript and TypeScript.
• Thorough understanding of React/Next.js principles, React Router, hooks, and Redux.
• Experience building modern distributed microservices.
• Cloud environment development (Google Cloud preferred).
• Building, testing, and troubleshooting high-volume web services using REST & JSON.
• Strong foundation in data structures and algorithms in JS.
• Expertise with semantic HTML and modern CSS tooling.
• Experience with responsive/adaptive design and testing (unit and E2E).
• Familiarity with AI-assisted development tools to improve productivity and code quality.
• English proficiency at B2+.

Responsibilities

• Design, build and maintain efficient, reusable and reliable code.
• Build React/Next.js based applications.
• Ensure the best performance, quality, and responsiveness of applications.
• Identify bottlenecks and bugs, and devise solutions.
• Help maintain code quality.
• Participate in agile team scrums and communicate status clearly.
• Collaborate with BA, QA, developers and offshore teams to deliver applications requested by stakeholders.
• Share knowledge with the team during workshops.

Skills

JavaScript

TypeScript

React/Next.js

Web performance

Security

REST & JSON

Semantic HTML

CSS (Tailwind)

Tailwind

Styled Components

CSS Modules

SASS

Unit testing

E2E testing

AI-assisted tools

GitHub Copilot

English (B2+)

Tools

Docker

Contentful

NodeJS

GraphQL

REST APIs

API testing tools

Job description

Growth through diversity, equity, and inclusion. As an ethical business, we do what is right — including ensuring equal opportunities and fostering a safe, respectful workplace for each of us. We believe diversity fuels both personal and business growth. We're committed to building an inclusive community where all our people thrive regardless of their backgrounds, identities, or other personal characteristics.

• Design, build and maintain efficient, reusable and reliable code.
• Build React/Next.js based applications.
• Ensure the best possible performance, quality, and responsiveness of applications.
• Identify bottlenecks and bugs, and devise solutions to mitigate and address these issues.
• Help maintain code quality.
• Participate in the agile team scrums and effectively communicate to the team the status, roadblocks, and timelines for the task at hand.
• Must be able to collaborate with BA, QA, developers and offshore developers to plan, design, develop, test, and maintain mobile web and desktop-based applications requested by the stakeholders.
• Share knowledge with the team during workshops.

What We're Looking For:

• 5+ years of professional experience.
• Excellent communication skills.
• Great ownership of assigned tasks. Self-driven and proactive approach.
• Strong experience in JavaScript and TypeScript.
• Thorough understanding of React/Next.js core principles along with React router, hooks, Redux (or the like) workflows, Web performance and security.
• Developing and maintaining modern distributed micro services.
• Development in Cloud environments (Google Cloud Platform preferred).
• Building, testing, and troubleshooting high volume web services using API Protocols and Data Formats (REST & JSON).
• Solid foundation in data structures, algorithms and its implementation in JS.
• Expertise with semantic HTML.
• Proficiency in CSS, including Tailwind, Styled Components, CSS Modules, and SASS.
• Expertise browser-based debugging tools.
• Experience with responsive and adaptive design.
• experience with Testing (Unit Testing, react-testing-library, E2E).
• Keen understanding of web application development process and standard methodologies.
• Experience using AI-assisted development tools to improve productivity and code quality, such as Claude, GitHub Copilot, and similar tools.
• Ability to apply AI tools effectively for coding, debugging, testing, refactoring, and documentation while maintaining high standards of code quality, security, and best practices.
• English (B2+).

What Will Set You Apart:

• Previous experience in Front-end development with Docker.
• Experience with Headless CMS (preferably Contentful).
• Experience with NodeJS.
• Knowledge of GraphQL.

Missing one or two of these qualifications? We still want to hear from you! If you bring a positive mindset, we'll provide an environment where you feel valued and empowered to learn and grow.