Senior Backend Engineer (Java, Kotlin, Spring Boot, AWS)

Quick Facts

• Role: Backend engineer for B2B digital products
• Work style: event-driven, cloud-native, containerized

Description

We are looking for a backend engineer to develop and evolve digital products and services that power a B2B business for professional customers and partners. You will build scalable backend services and integrations to support customer experience, sales processes, and digital services, working in an event-driven environment. The role includes collaborating with engineers, product owners, and architects to deliver reliable and maintainable solutions.

Responsibilities

• Develop and maintain backend services, APIs, and integrations using Kotlin, Java, and Spring Boot
• Translate business and B2B customer requirements into scalable and maintainable solutions
• Contribute to event-driven architectures and asynchronous processing using Kafka
• Support integration of backend systems within cloud-native and containerized environments
• Design and maintain data models and persistence layers using PostgreSQL
• Collaborate with product, business, and engineering teams to refine requirements and deliver features
• Contribute to code quality, testing, observability, and system reliability
• Use AI-powered development tools to improve productivity, code quality, and efficiency

Requirements

• Completed university degree in Computer Science or a comparable technical field
• 6+ years of professional backend development using Kotlin and Spring Boot in complex environments
• Strong expertise in REST APIs, microservices, distributed systems, and event-driven architectures
• Deep hands-on experience with Kafka and asynchronous processing patterns in production systems
• Strong experience with AWS and Kubernetes (including Amazon EKS)
• Solid experience with PostgreSQL and designing performant, reliable data models
• Experience with CI/CD, containerization, observability tooling, and modern security concepts (OAuth2, IAM)
• Strong communication skills in English and Polish; readiness to work hybrid in Katowice

Benefits

• Benefits budget (550 PLN monthly) via a Motivizer platform (medical care, meal tickets, sports cards, cinema tickets, vouchers, discounts, and more)
• Language courses via a multi-language learning platform
• Regular, systematic further training (internal and external)
• Internal community with networking events, coding challenges, and company parties