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JavaScript / Mashup Developer
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Offer summary

(Summary generated by AI based on the full job description)

The project involves building front-end interfaces based on React.js with integration of QlikSense API and creating dynamic mashups. Advanced knowledge of TypeScript, ES6, React Hooks, D3.js, AG-Grid and testing frameworks Jest and Enzyme is required. Responsibilities include UI design, implementation of micro-frontends (Webpack Module Federation), handling WebSockets, and using AI-assisted coding tools. Benefits include private healthcare, Multisport card, insurance.

newyou can start ASAP

JavaScript / Mashup Developer

Company: Mindbox Sp. z o.o.

from: 17 June 2026
to: 17 July 2026
26 000 - 29 000 złnet (+ VAT)/ mth.B2B contract (full-time)
Offer parameters
level:senior
working mode:hybrid
location:Warszawa, Masovian
Warszawa, Masovian

Requirements

Expected technologies

JavaScript
React.js
TypeScript
ES6
Redux
HTML
CSS
QlikSense

Operating system

Windows

Our requirements

  • 10+ years of professional front-end development experience, with significant expertise in React.js (16.x or higher).
  • Proven track record in TypeScript and ES6 programming.
  • Advanced experience with D3.js for data visualization and AG-Grid for grid-heavy interfaces.
  • Expertise in React Hooks, Redux, and middleware (e.g., Redux Thunk).
  • Strong foundations in HTML5, CSS3, responsive design concepts, and pre-processors.
  • Hands-on experience with Material-UI or similar React-based design systems.
  • Practical knowledge of QlikSense API integration; familiarity with Enigma.js is essential.
  • Strong understanding of WebSockets for real-time data systems.
  • Knowledge of unit testing frameworks (Jest, Enzyme).
  • Familiarity with CI/CD, GitHub, and automated source code control.
  • Demonstrated ability to identify and fix security vulnerabilities in code.

Optional

  • Experience working with Qlik APIs or MI reporting platforms.
  • Knowledge of cloud platforms and containerized deployments.

Your responsibilities

  • Design, develop, and enhance React.js applications with advanced UI components.
  • Integrate QlikSense API with React layer and implement dynamic, secure mashups.
  • Utilize modern front-end technologies including TypeScript, ES6, and React Hooks to build reusable components.
  • Implement advanced visualization capabilities using D3.js and AG-Grid libraries.
  • Develop and optimize UI layouts using Material-UI, Bootstrap, and responsive design principles.
  • Implement real-time features using WebSockets for data-intensive systems.
  • Apply AI-assisted coding tools (GitHub Copilot, Claude) to improve productivity.
  • Ensure robust unit testing using Jest and Enzyme, and deliver maintainable, secure code.
  • Manage API communications using Axios/fetch, handle security vulnerabilities, and follow best practices in Secure SDLC.
  • Configure Module Federation (Webpack) for optimized micro-frontend integration.
  • Support agile development, CI/CD pipelines, and automated deployments via Jira, Jenkins, Ansible.
  • Note: Detailed project information will be shared during the recruitment process.

About the project

We are looking for an experienced Senior Mashup Developer with deep expertise in React.js and advanced front-end frameworks to support the development of robust, scalable interfaces within enterprise platforms. The ideal candidate will also have hands-on experience leveraging AI tools like GitHub Copilot or Claude to boost development efficiency and deliver modern UI solutions.
You will work on building mashups integrating dynamic dashboards, advanced visualization components, and APIs, enabling real-time, interactive data experiences for a global user base.
Sounds like your kind of challenge?

This is how we organize our work

This is how we work

at the client's siteagile

This is how we work on a project

  • Continuous Deployment
  • Continuous Integration
  • DevOps
  • issue tracking tools
  • testing environments
  • unit tests
Joining this project you’ll become part of Mindbox – a tech-driven company where consulting, engineering, and talent meet to build meaningful digital solutions. We’ll back you up every step of the way, accelerate your development, and ensure your skills make a difference.
Company

What we offer

  • Flexible cooperation model – choose the form that suits you best (B2B, employment contract, etc.)
  • Hybrid work setup – 6 days per month from Kraków or Warsaw office
  • Collaborative team culture – work alongside experienced professionals eager to share knowledge
  • Continuous development – access to training platforms and growth opportunities
  • Comprehensive benefits – including Interpolska Health Care, Multisport card, Warta Insurance, and more
  • High quality equipment – laptop and essential software provided

Benefits

  • sharing the costs of sports activities
  • private medical care
  • sharing the costs of professional training & courses
  • life insurance

Mindbox Sp. z o.o.

At Mindbox, we connect top IT talents with technology projects for leading enterprises across Europe.
Our focus is on matching your skills with work that matters – projects that use modern tech stacks, solve real business challenges, and give you space to grow. By joining us, you’ll deliver technology solutions for well-known brands, supported by the Mindbox team that values knowledge-sharing and continuous development. We make sure you have the tools, flexibility, and guidance to do your best work – and to keep moving forward in your career.
JavaScript / Mashup Developer
26k–29k zł / mth. (B2B)
I apply to:
Mindbox Sp. z o.o.
Warszawa, Masovian
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