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Offer summary
(Summary generated by AI based on the full job description)
The project focuses on modernizing the user interface of a complex structured notes pricing application. Technologies include ReactJS, JavaScript, TypeScript, CSS-in-JS, SCSS, and tools such as webpack, npm, GitLab, Jenkins. Responsibilities cover UI component development, legacy refactoring, backend collaboration, implementing responsive designs, and improving CI/CD workflows. Knowledge of React Hooks, Context API and SOLID principles is required.
from: 2 September 2026
to: 2 October 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:hybrid • full office
Warszawa, Mokotów
Requirements
Expected technologies
React.js
TypeScript
JavaScript
CSS3
Optional technologies
Next.js
AWS
Our requirements
- Minimum of 5 years of commercial frontend development experience
- Strong knowledge of ReactJS (including Hooks and Context API) and JavaScript
- Practical experience with TypeScript with proficiency in modern CSS techniques and tools
- Familiarity with modern frontend tooling: webpack, npm, GitLab/Jenkins
- Understanding of testing methodologies and software design principles
- Fluency in English (spoken and written)
- Open to hybrid work (3 days per week in the office)
Your responsibilities
- Developing and maintaining user interface components using ReactJS and JavaScript
- Collaborating with backend developers and strategists to implement features
- Refactoring legacy UI components to align with the new architecture
- Utilizing CSS-in-JS or SCSS for styling and implementing responsive designs
- Participating in code reviews and applying SOLID design patterns
- Contributing to improving CI/CD workflows and frontend build processes
About the project
Join the dynamic international team of professionals split between London and Warsaw. We are looking for an experienced Frontend Developer to help modernize the user interface of a complex pricing application used for structured notes. The role involves working closely with both frontend and backend developers as we uplift the existing UI while maintaining compatibility with the legacy application.
What we offer
- Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
- Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
- We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
- Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
- Comfortable workplace – class A offices or remote work
- Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
- PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
- Investment in your growth – meetups, webinars, training platform and technology blog – you choose
- Fantastic atmosphere created by all Sii Power People
Recruitment stages
- 1.Send your CV
- 2.Talk to us about your expectations
- 3.Learn more about our projects and choose the best
- 4.Start your adventure with Sii!
Sii Sp. z o.o.
Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.
Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.
This is how we work
Front-end Developer with React (f/m/x)
I apply to:
Sii Sp. z o.o.
Warszawa, Mokotów
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