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September 28, 2026

Kotlin & Java Backend Developer

Mid • Remote

100 - 130 PLN/yr

Gdańsk, PM, Poland

Quick Facts

  • Role: Mid/Senior Backend Engineer (Kotlin & Java)

  • Focus: Scalable e-commerce backend services and microservices

  • Work mode: Remote with occasional onsite workshops/planning

  • Contract length: 12 months (starting ASAP)

Description

Build and evolve backend services for an e-commerce client using Kotlin and Java. Design microservice-based solutions, create reliable backend components and APIs, and improve existing systems for performance, scalability, and maintainability. Collaborate with Product, Data, and UX to refine requirements and technical solutions.

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 high-quality APIs and backend components

  • Write automated tests and uphold code quality standards

  • Design architecture for new functionalities and services

  • Improve existing systems (performance, scalability, maintainability)

  • Collaborate with Product Managers, Data Analysts, and UX Designers

  • Apply engineering best practices and development standards

  • Use AI-powered development tools to increase productivity and code quality

Requirements

  • Strong proficiency in Kotlin and Java

  • Hands-on experience with Spring Boot

  • Proven background delivering microservices and backend APIs

  • Experience creating, testing, and maintaining backend services

  • Ability to design technical solutions and take ownership of implementation decisions

  • Understanding of clean code and software engineering best practices

  • Effective collaboration with cross-functional teams in an agile environment

  • Practical use of AI-assisted development tools such as GitHub Copilot or similar

  • Strong communication skills

  • English B2+ and fluent Polish

Benefits

  • Ongoing support from a dedicated agent to ensure project continuity and work comfort

  • Consultant Development Program for growth planning and mentoring

  • Access to 7N Learning & Development (webinars, articles, industry reports, events)

  • Integration events (including trips and parties) for you and your loved ones

  • Professional development including knowledge transfer opportunities

  • Access to experienced IT experts and a long-tenure team

  • Full benefits package: medical care funding, life insurance, sports cards, and discounts

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