Backend Engineer (Java/Kotlin, Spring Boot)

Quick Facts

• Role: Backend Engineer (Java/Kotlin, Spring Boot)

Description

You will develop and maintain scalable backend services, APIs, and integrations in an event-driven environment to support B2B customer experience, sales processes, and digital services. You will translate business and customer requirements into maintainable solutions and collaborate with product, engineering, and architecture teams. The role also focuses on cloud-native, containerized integrations and continuous improvements to code quality, testing, observability, and reliability.

Responsibilities

• Develop and maintain backend services, APIs, and integrations using Kotlin, Java, and Spring Boot

• Deliver scalable backend solutions based on business and B2B requirements

• Contribute to event-driven architectures and asynchronous processing with Kafka

• Support integration of backend systems in cloud-native, containerized environments

• Design and maintain data models and persistence layers with PostgreSQL

• Collaborate across product and engineering teams to refine requirements and deliver features

• Improve code quality, testing, observability, and system reliability

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

Benefits

• Motivizer Benefits Platform with a 550 PLN monthly budget (medical care package, meal tickets, sports cards, cinema tickets, vouchers/discounts)

• Language courses via a multi-language learning platform

• Regular and systematic further training (internal and external)

• Community and events (networking events, coding challenges, company parties)

Requirements

• Completed university degree in Computer Science or a comparable technical field

• 3–5 years of professional backend development with Kotlin or Java and Spring Boot

• Good understanding of REST APIs, microservices, and distributed systems

• Hands-on experience or exposure to Kafka or similar messaging systems

• Experience with PostgreSQL and designing reliable data models

• Familiarity with CI/CD, containerization, and basic security concepts (OAuth 2.0, IAM)

• Strong communication skills in English and Polish; readiness for hybrid work in Katowice

Nice to have

• Experience with AWS and Kubernetes (e.g., Amazon EKS)

• Experience with event-driven architectures in production environments

• Familiarity with observability tools and monitoring practices