Fullstack Developer (React, Kotlin/Java) - frontend-oriented

Project overview

For our client in the e-commerce industry, we are looking for a Fullstack Engineer (Mid/Senior) with a predominance of frontend competencies.

The project focuses on creating tools for advertisers, including recommendation systems, data analytics, and marketing campaign management automation.

Work distribution: 60% frontend and 40% backend

Work model: Remote work (occasional meetings 1-2 times per quarter in Warsaw or Krakow)

Project details

long-term cooperation

Scope of responsibilities

Expectations

We offer

About 7N

Constantly searching for projects, difficult rate negotiations, lack of development support – sound familiar? At 7N, you gain not only contract stability but also the commitment of a personal guardian who cares about your professional comfort and constant access to development initiatives.

Our goal is to provide you with stable and comfortable cooperation that contributes to the success of you as an IT expert and our clients. We build lasting relationships based on Scandinavian values and 30 years of experience in creating IT solutions for over 200 organizations.

• Development and construction of scalable microfrontends based on React for analytical dashboards (including SSR and accessibility/a11y)
• Co-creation and development of APIs powering dashboards and market benchmarks
• Development of backend services (Java/Kotlin, Spring Boot) generating and delivering personalized recommendations for users in cooperation with the Data Science team
• Cooperation in the development of a distributed event-driven architecture processing large volumes of data in the cloud
• Utilization of modern AI tools (including GitHub Copilot, OpenAI, Anthropic) in the daily software development process
• Participation in technical duty and incident response (on-call: rotational duty once every approx. 1.5-2 months)
• Very good, practical knowledge of TypeScript, React, HTML/CSS, and modern web applications, including JavaScript fundamentals, HTTP communication, REST API, and testing (Jest/Vitest/Playwright)
• Experience in building scalable user interfaces and good knowledge of accessibility (a11y), client-server communication, and frontend application performance.
• Solid fundamentals and fluency in programming in Kotlin or Java and knowledge of Spring Boot.
• Knowledge of microservice architecture
• Practical experience and conscious use of AI tools supporting development (GitHub Copilot, OpenAI, Anthropic, or similar solutions)
• Polish language (required) and English language at a minimum B2+ level
• Nice to have: experience with Microfrontends, Server-Side Rendering (SSR), event-driven architecture, knowledge of Scala, knowledge of relational and non-relational databases (SQL, MongoDB), and cloud solutions (preferably GCP)
• Constant support from a personal agent, ensuring project continuity, client contact, necessary formalities, work comfort, and development,
• Consultant Development Program – career planning consultancy based on the latest IT market trends and needs, including consultations with agents and career mentors,
• Access to 7N Learning & Development – a development and educational platform with webinars, a library of industry articles and reports, and regular invitations to one-off and cyclical development events – technical, business, and lifestyle,
• Spectacular integration events, both for you (e.g., annual Kick-Off trip, Christmas parties, or Summer Games sports events), and for your loved ones (e.g., family picnics, movie premieres),
• Professional development not only during the project – you can get involved in knowledge sharing with others as part of the 7N Services offering for 7N clients,
• Relationships and access to knowledge from the most experienced IT experts on the market – the average professional experience of our Consultants in Poland is over 10 years.
• A comprehensive benefits package, i.e., co-financing for medical care, life insurance, a sports card for you and your loved ones, as well as discounts at stores in Poland and abroad.
• Start: flexible
• Remote: remote
• Location: Anywhere, Poland, PL
• Languages: Polish