Front-end Developer with React (f/m/x)

Sii Poland; Warszawa; Hybrid; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Great Place to Work

Profit sharing

Medical care

Centre of internal trainings

Flexible work options

Job summary

Sii Poland is seeking an experienced Frontend Developer to modernize the pricing UI for a complex notes-based application, collaborating with both frontend and backend teams in an international split between London and Warsaw.

Responsibilities include building UI components in React, integrating with the backend, and refactoring legacy components to fit a new architecture while ensuring responsive design and SOLID principles. Hybrid work is available (3 days in office).

Qualifications

• 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).

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.

Skills

ReactJS

JavaScript

TypeScript

CSS techniques

Webpack

NPM

GitLab/Jenkins

Testing

English

Hybrid work

Tools

Webpack

NPM

GitLab/Jenkins

Job description

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.

Your tasks

• 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

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)

Job no. JOB-KZCK6

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn fromOpen and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care