Java Script/ Mashup Dev

At Mindbox we connect top IT talents with technology projects for leading enterprises across Europe. 

 

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? 

What you’ll be doing

  • 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. 

What you get in return

  • 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 

Who we’re looking for

  • 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.

Nice to have:

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

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. 

Java Script/ Mashup Dev

Kraków

B2B

1300 - 1450 PLN/MD + VAT

Apply for position

SUPPORT & BENEFITS

Private healthcare

Fast access to doctors and medical tests. 

Mindbox fully covers the individual package. You can extend the coverage to your partner and family on preferential terms. A wide network of medical providers and clear rules for everyday use.

Multisport

Energy that pays off.

We cover 50% of the card cost. You get access to thousands of sports facilities across Poland, plus a convenient mobile app. Additional cards for family members are available.

Training & development

Practical support for your career growth.

We co‑fund courses, certifications and conferences under a clear Training Policy. You also get access to a library of recorded webinars and trainings – available whenever you need them.

Eyewear or contact lenses co‑funding

Clear vision means comfortable work.

Up to PLN 500 every two years, with an additional PLN 300 available in justified cases. Simple reimbursement, regardless of your form of cooperation.

Group life insurance

Real protection from day one.

Option I is fully funded by Mindbox, Option II is co‑funded. You can include your partner and adult children, with coverage that also applies to treatment and hospitalisation abroad.

Ongoing support from the Talent Network Development

You’re not on your own in a project.

Regular contact, quick response and a partnership‑based approach. You focus on your work — we help take care of the rest.

Regular integration meet‑ups

Relationships that work beyond the project.

Cyclical meet‑ups for contractors in major cities across Poland. A space to talk, exchange experience and stay in real contact with the Mindbox team.

Annual company‑wide integration

One event. The whole community.

A two‑day company gathering with accommodation, transport and a full activity programme. Time to connect teams from across Poland and build shared experiences.

New baby gift

Important moments matter to us.

When a child is born, we prepare a personalised gift. All it takes is a short message to the Talent Network Development team.

do you like
like our offer?

the recruitment process

We support you at every stage

Submit your CV

Apply directly for a selected job offer or simply send us your CV.

Recruiter call

If your profile matches the role or we have a good opportunity for you, a recruiter will get in touch with you.

Profile shared with the client

After the call, we recommend your profile to the client. This is your first real step toward a specific project.

Project interview

If the client wants to proceed, we arrange the meeting. We prepare you for the interview and stay in close contact.

Feedback and decision

You receive feedback regardless of the outcome. If it’s a match, we present an offer.

Contract 100% online

All formalities are handled remotely. Fast, convenient and straightforward.

Ongoing support

Our IT Talent Network team supports you throughout the entire project.

Referral Program

Refer a friend & get up to 6,000 PLN

Do you know an IT specialist who could be a good fit for one of our projects? Share their contact details with us and we’ll take care of the rest.

You can receive up to 6,000 PLN for a successful referral.