Kotlin & Java Developer

About the ProjectWe are looking for a Mid/ Senior Backend Engineer who enjoys building scalable services, collaborating across disciplines, and contributing to product development from concept to delivery for our e-commerce client. Work Mode: remote work with occasional onsite workshops and planning sessions

• Start Date: ASAP, 12 months contractJob Responsibilities
• Develop and maintain backend services using Kotlin and Java
• Build and evolve applications based on Spring Boot
• Design, implement, and enhance microservice-based solutions
• Create and maintain reliable, high-quality APIs and backend components
• Develop automated tests and ensure code quality standards are met
• Design architecture for new functionalities and services
• Improve existing systems through performance, scalability, and maintainability enhancements
• Collaborate closely with Product Managers, Data Analysts, and UX Designers to refine requirements and define technical solutions
• Contribute to engineering best practices and development standards
• Utilize modern AI-powered development tools to increase productivity and code quality
• Expectations
• Strong proficiency in Kotlin and JavaHands-on experience with Spring BootProven background in designing and delivering microservices
• Experience building, testing, and maintaining backend services and AP
• IsAbility to design technical solutions and take ownership of implementation decisions
• Understanding of software engineering best practices and clean code principles
• Experience collaborating effectively with cross-functional product and business teams
• Practical use of AI-assisted development tools such as GitHub Copilot, Open
• Code, or similar agentic coding solutions
• Strong communication skills and ability to work in an agile environmentBig plus if you have experience with frontend or mobile technologies (Web, iOS, or Android)

We'll appreciate familiarity with MongoDB and Spring Data MongoDBA strong advantage if you have worked with Google Cloud Platform (GCP)

English at B2+ level and fluent PolishWe offer

• Ongoing support from a dedicated agent, taking care of your project continuity, client contact, necessary formalities, work comfort and development
• Consultant Development Program – advice on growth planning based on the latest trends and market needs in IT, including consultations with agents and growth mentors
• Access to 7N Learning & Development – a development and educational platform with webinars, a library of articles and industry reports, and regular invitations to one-time and recurring development events – technical, business, and lifestyle
• Spectacular integration events, both for you (e.g., annual Kick-Off trip, Christmas parties, or Summer Olympics 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 transfer to others within the 7N Services offering directed at 7N clients

Relationships and access to the knowledge of the most experienced IT experts in the market – the average professional tenure of our consultants in Poland is over 10 yearsA complete benefits package, including funding for medical care, life insurance, sports cards for you and your loved ones, as well as discounts in stores in Poland and abroad

About 7NConstantly searching for projects, difficult rate negotiations, lack of development support – sounds familiar? At 7N, you gain not only stability of contracts but also the personal involvement of a dedicated agent who ensures your professional comfort and continuous access to development initiatives. Our mission is to provide stable and rewarding collaborations that drive your success as an IT expert and the success of our clients. We build long-lasting relationships based on Scandinavian values and 30 years of experience creating IT solutions for over 200 organizations.