Senior Frontend Developer

Salary: 800-1000 pln/md B2B

Work model: elastic hybrid in Warsaw 

Why choose this offer?

• Contribute to the development of a leading e-commerce advertising platform
• Work on functionalities that drive user engagement and advertising success
• Join a team that values creativity and innovation
• Develop microservices for large-scale systems using advanced technologies

Project

We’re looking for a Senior Frontend Engineer to join the Ads department and co-create a centralized Retail Media platform automating campaign execution across marketplaces and social entertainment channels such as TikTok, Meta, and YouTube.

The team is responsible for delivering high-quality, scalable solutions that improve advertising performance and ROI for advertisers. You will collaborate closely with Product Managers during ideation and with ML Engineering during implementation, ensuring robust and production-ready solutions.

What you'll be doing

• Oversee all aspects of product development - from ideation (in collaboration with Product Managers) through development, deployment, and maintenance.
• Build and scale complex web applications within the React ecosystem.
• Manage high-complexity frontend architectures and actively reduce technical debt in production environments.
• Take full ownership of the testing lifecycle, including unit and E2E testing strategies

Expected competences and knowledge

• 5+ years of professional experience building and scaling complex web applications with the React ecosystem
• Proven track record of managing advanced frontend architectures and ensuring platform stability
• Experience working with automated CI/CD pipelines enabling frequent and reliable production deployments
• Active participation in code reviews with a performance-first mindset
• Advanced TypeScript, JavaScript (ES6+), and Node.js knowledge
• B2+ English proficiency and experience working with Git version control

Technologies you'll work with

• React (v16.8+ hooks, Context API) and Vanilla JS
• TypeScript, JavaScript (ES6+), Node.js
• HTML5, CSS3, Responsive Web Design, Atomic/Utility-first CSS
• Jest (Unit), Cypress or Playwright (E2E)
• Component-driven design principles and Design System integration
• Modular/micro-frontend frameworks (e.g., Opbox)

Client – why choose this particular client from the Jit portfolio?

Our Client dominates the Polish e-commerce arena as the market leader since 1999. With a user base of over 20 million and growing, this well-established platform is at the forefront of e-commerce, constantly striving for growth through market expansion and investment. As a major player in technology, our Client boasts a talented IT team of over 1,000 employees who focus on developing their own cutting-edge technologies. 

Jit Team has had a successful partnership with our Client since spring 2021, with multiple software development teams dedicated to our Client's platforms. These teams operate autonomously, designing platform components through micro-services. 

Working with our Client offers a chance to contribute to a solution used by millions on a daily basis and to tackle the challenge of delivering software at a massive scale, where even a single second of delay can have a significant impact. This project provides a unique opportunity to work with state-of-the-art technologies and tools, making it a rare and valuable experience. 

About Jit Team

The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts. We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme.

Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity. By supporting indigenous initiatives, we ensure the circulation of good energy.