Frontend React Developer (with basic Python)

Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people with offices in Wrocław, Warsaw, and Cracow. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊  

We are looking for an experienced Frontend Developer (React) to join an innovative biomedical team of our German client, which is driving precision oncology research through cutting-edge data science. You will play a role in developing and maintaining modern web interfaces that support bioinformatics tools and next-generation sequencing (NGS) pipelines. Your work will directly contribute to uncovering biomarkers and improving cancer treatment decisions. If you have a strong eye for UI/UX, experience with React and Material UI, and a passion for building impactful software—this role is for you.

A positive attitude, scientific curiosity and the ability to start soon are major advantages!

Responsibilities:

• Develop and maintain responsive frontend applications using React and Material UI (MUI).
• Build clean, maintainable, and responsive interfaces with HTML5, CSS3, and TypeScript.
• Take ownership of UI/UX aspects of the application – we don’t have a dedicated designer, so you will be expected to apply best practices in usability and interface design.
• Collaborate with backend developers and product stakeholders to deliver seamless user experiences.
• Implement automated testing for frontend features (e.g. Playwright).
• Support CI/CD pipelines using GitHub Actions.
• (Nice to have) Work with backend components written in Python.

We offer a choice of employment form: B2B or Employment Contract 

• UoP: 14 000 – 16 000 PLN gross/month
• B2B: 120 – 140 PLN net/hour + VAT

You might be the perfect match if you are/have:

• At least 4 years of professional experience as a Frontend Developer, with a strong focus on building modern, scalable web applications using React.
• Proficiency in TypeScript – you leverage static typing to build more robust and scalable codebases, and you’re comfortable using TypeScript in a React environment.
• Hands-on experience with Material UI (MUI) – you know how to use and customize component libraries to build consistent and elegant user interfaces aligned with design system principles.
• Strong command of HTML5 and CSS3 – you can create well-structured, semantic markup and responsive layouts using media queries, Flexbox, and CSS Grid, ensuring cross-browser and cross-device compatibility.
• Experience in UX/UI design principles – even without a dedicated designer on the team, you're able to design intuitive, user-friendly interfaces and apply usability best practices.
• Solid understanding of frontend architecture and best practices – you write clean, modular, and maintainable code, and you are also familiar with concepts such as component reusability, code splitting, performance optimisation, and accessibility (WCAG).
• Experience with frontend testing tools – you can write and maintain end-to-end tests using Playwright (or similar tools like Cypress), and you prioritize test coverage and code reliability in your workflow.
• Comfort with Git and CI/CD tools – you’re familiar with modern development workflows, know how to use Git efficiently, and have experience working with GitHub Actions or other CI/CD pipelines for build, test, and deployment automation.
• Fluent English communication skills, both written and verbal – you’re able to work effectively in an international team, contribute to discussions, and write clear documentation or feedback.
• Located in Poland – to enable occasional in-person team meetings.

Moreover, we appreciate skills in these areas:

• Experience with Python on the backend side;
• Exposure to bioinformatics or genomics in life sciences projects;
• Understanding of scientific workflows, statistical analysis, or machine learning in bioinformatics.

By joining us, you gain the following: 

• Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; 
• Possibility to develop in cloud technologies;
• Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; 
• Respect for your private life so you don't have to work overtime or on weekends; 
• Team Events budget to socialize outside of work; 
• Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in Cape Town, Are, and Barcelona). 

Perks and benefits: 

• Fully remote work or in our office in Wrocław, Warsaw or Cracow; 
• Free benefits such as Luxmed, Multisport, and life insurance in Nationale Nederlanden; 
• Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); 
• Personal Training Budget with additional paid hours; 
• Passion Day - an extra day off for your hobby to spend as you please; 
• Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; 
• We provide high-quality work equipment + 2 additional monitors and accessories. 

If you apply for this position and match our expectations, then: 

1) You will be invited to an HR Screening with our IT Recruiter. 

2) You will have a technical interview. 

3) You will meet with a client. 

Submit your application online in one easy step! Apply now!