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Senior Frontend Developer
New
JavaScript

Senior Frontend Developer

5 559 - 6 671 USD/monthNet per month - B2B
5 559 - 6 671 USD/monthNet per month - B2B
Type of work
Full-time
Experience
Senior
Employment Type
B2B
Operating mode
Hybrid
Jit Team

Jit Team

Jit Team – the human factor of IT. We build software development teams for our clients operating in various branches of business. We believe that the most important factor is the human factor. Our main value are Jit people - excellent specialists.

Tech stack

    TypeScript

    advanced

    React

    advanced

    JavaScript

    advanced

Job description

Salary: 1000 - 1200 pln/md B2B

Location: Gdynia/ Warszawa / Rzeszów/ Kraków (hybrid)

 

Why choose this offer?


  • Join a mission-critical team delivering core web products for a leading market intelligence company in the energy and commodities space. Your work will have a direct impact on how data is visualized and consumed by global decision-makers
  • Collaborate with top-tier professionals, including Product Owners, Technical Architects, and Analysts, in a highly cross-functional setup
  • Work on meaningful, data-intensive applications, contributing to real-world insights with complex data visualizations and responsive, high-performance UIs
  • Opportunity to shape architecture and components, using modern frameworks and design systems in a fast-evolving tech environment
  • Support for professional growth through exposure to both frontend and backend technologies (including optional Python and CI/CD practices)

 

Project


We are seeking a talented Frontend Engineer with deep expertise in React to join our Engineering team. You will be responsible for building and maintaining high-performance, data-centric web applications that integrate seamlessly with third-party services and in-house APIs.

The Engineering team is responsible for the delivery of cient's core web products. You will collaborate with other developers and UX/UI designers to build and style professional, premium-looking web applications, while also working very closely with our Data Analytics and Market Intelligence teams on functional requirements.

The ideal candidate will have a strong background in building scalable, efficient frontends, as well as experience with state management, design systems, and working with backend teams.

Responsibilities

  • Work closely with the webapp delivery team, namely the Product Owner and Technical Architect, to contribute to the development of several web applications
  • Develop high-quality, performant web applications using React and associated libraries, with an emphasis on clean, maintainable code
  • Build reusable components and front-end libraries, adhering to modern best practices
  • Implement responsive designs with cross-browser compatibility and ensure accessibility
  • Contribute to QA via unit and integration tests, to ensure robust and bug-free functionality

 

Expected competences and knowledge

  • +5 years of experience working with React.js and related libraries
  • Strong knowledge of modern JavaScript (ES6+), CSS, and HTML
  • Proficiency in React.js core concepts, including hooks, context API, state management (Redux), routing, error handling, and debugging
  • Experience with TypeScript, including static types, interfaces, and generics
  • Experience with design systems and UI libraries such as Material UI (MUI)
  • Experience with data-heavy applications, including integrating with REST APIs, etc.
  • Knowledge of charting libraries like Highcharts, Plotly.js
  • A passion for building user-friendly, high-performance applications, especially in environments with heavy data processing or visualisations
  • Experience with maps libraries e.g. MapboxGL
  • Understanding of version control systems (git) and dependency managers (npm, yarn)
  • Excellent communication skillsDesirable Skills
  • Python experience is a plus, especially in collaborating with backend teams
  • Experience with CI/CD pipelines and deployment platforms, including Github Actions, CircleCI, Vercel or serverless architectures
  • Experience with build tools like Vite or similar
  • Previous experience with automated test frameworks, e.g. Playwright
  • Experience with GraphQL
  • An interest in commodities, energy, or financial markets; a background in a market intelligence business

 

Technologies you'll work with


  • React (Hooks, Context API, routing, Redux)
  • TypeScript (static types, interfaces, generics)
  • JavaScript (ES6+)
  • HTML, CSS
  • REST APIs
  • Material UI (MUI)
  • Highcharts, Plotly.js
  • MapboxGL
  • Data-heavy applications and advanced data visualizations

 

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


Our Client, an established and rapidly growing research-based consulting firm in the energy sector, is seeking skilled IT professionals to support their ambitious expansion plans. With a strong reputation for providing industry-leading short-, medium-, and long-term analyses and forecasts of energy markets, they enable their customers to make informed decisions on trading, investing, financing, and planning. Their recent acquisition of a macroeconomic research firm has further enhanced their offerings in global financial markets and allowed them to better serve an increasing client base amid the accelerating energy transition and market uncertainties.

 

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 500 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.

 

 

5 559 - 6 671 USD/month

Net per month - B2B