SENIOR BACKEND DEVELOPER - KOTLIN / SPRING BOOT

Reply Group; Katowice; Hybrid; PLN 180,000 - 240,000; Full time

Job summary

A tech company in Katowice is seeking an experienced Backend Developer to design and maintain services using Kotlin and Spring Boot. You will collaborate with diverse teams and work in a hybrid model. Ideal candidates should have 4+ years in backend development, along with experience in AWS and microservices. Join us to further develop your skills and the digital future!

Benefits

Medical care

Training opportunities

Language courses

Company events

Benefits platform

Qualifications

• 4+ years of experience in backend development with Kotlin or Java.
• Proficiency in Spring Boot and PostgreSQL.
• Strong communication skills for cross-team collaboration.

Responsibilities

• Design, develop, and maintain backend services in Kotlin with Spring Boot.
• Build and consume REST APIs and event-driven services using Kafka.
• Collaborate with multiple teams across the SRT platform.

Skills

Kotlin or Java

Spring Boot

PostgreSQL

REST APIs

Kafka

Event-driven systems

Agile mindset

Education

Bachelor's degree in computer science, mathematics, or physics

Tools

AWS

Terraform/Open Tofu

CI/CD

Job description

You will join Team Digital Advice within the Sales Rep Tool (SRT) product group, the central gateway between OBI stores and the OBI ecosystem. The SRT is used daily in hundreds of stores across Europe to support store employees along the sales journey, from capturing customer leads and planning projects to managing orders and steering sales performance.

Your responsibilities include:

• Design, develop, and maintain backend services in Kotlin with Spring Boot
• Build and consume REST APIs and event-driven services using Kafka
• Work with PostgreSQL and MongoDB for data storage and retrieval
• Deploy and operate services in AWS within a cloud-native environment
• Collaborate with multiple teams, as Digital Advice has many integration points across the SRT platform
• Participate in Scrum ceremonies, sprint planning, and cross-team coordination
• Contribute to a team culture that values humor, code quality, pair programming, and team spirit, with cameras on in meetings
• Maintain high code quality through automated testing, CI/CD, and peer reviews
• MEDICAL CARE
• BENEFITS PLATFORM
• TRAINING OPPORTUNITIES
• LANGUAGE COURSES PLATFORM
• COMPANY EVENTS
• Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choosemedical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms),cinema tickets, shop vouchers, discounts and many more.
• Language Courses –you'll have access to a multi-language learning platform enabling you to practice you language skills and learn new ones!
• Regular and systematic furthertraining opportunities - both internallyand from external providers. We support your ongoing learning and development.
• Cooperation within an internal community is our everyday reality. We havenetworking events, coding challenges, and company parties for different occasions.

Qualifications

• Successfully completed a degree in computer science, mathematics, physics, or a comparable field of study
• 4+ years of experience in backend development with Kotlin or Java (willingness to work in Kotlin required)
• Proficiency in Spring Boot and working with PostgreSQL
• Experience in microservice architectures and Domain-Driven Design (DDD)
• Hands-on experience with REST APIs, Kafka, and event-driven systems
• Familiarity with AWS, Terraform/Open Tofu and CI/CD pipelines
• Agile mindset with experience in Scrum teams
• Strong communication skills for cross-team collaboration
• Fluent communication skills in English and Polish
• Bonus: basic German skills and/or experience with retail or sales tools
• Openness to hybrid work and regular visits in Katowice office.

Develop yourself and the digital future – at Reply!

Reply is made up of a network of highly specialised companies, which support leading industrial groups in defining and developing business models to optimise and integrate processes, applications and devices, using new technology and communication paradigms, such as Artificial Intelligence; Big Data; Cloud Computing; Digital Communication; Internet of Things; Mobile and Social Networking.

How to become a Replyer

Level 1

Your application

You found an opportunity that suits you and your abilities? Perfect! Use our application form to send us your resume and credentials. Once we received your documents, you will get a confirmation via email.

Level 2

Our reply

We will now review your application and come back to you as soon as possible. If it’s a match, we will contact you for an interview.

Level 3

Your interview

Is it a fit? Do we match your expectations? What about the job requirements and the workplace? All that will be covered in the interview. If more than one Reply company is suitable for you, you have the possibility to participate in several interviews!