BACKEND ENGINEER (JAVA, KOTLIN, SPRING BOOT)

Reply, Inc.; Katowice; Hybrid; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Medical Care

Benefits Platform

Language Courses Platform

Motivizer Benefits Platform

Multisport Card

Cinema Tickets

Shop Vouchers

Job summary

Reply Group in Katowice seeks a backend engineer to develop and evolve systems powering product and assortment management within a large retail ecosystem. You will build scalable backend services and integrations in an event-driven environment, collaborating with engineers, product owners, and architects to deliver reliable, maintainable solutions.

Your role focuses on creating robust backend services, APIs, and data models using Kotlin and Spring Boot, with Kafka for asynchronous processing.

Qualifications

• Completed university degree in Computer Science or a comparable field.
• 3–5 years of backend development experience with Kotlin or Java and Spring Boot.
• Strong understanding of REST APIs, microservices, and distributed systems.
• Hands-on experience with Kafka or similar messaging systems.
• Experience with PostgreSQL and data modeling for reliable storage.
• Familiarity with CI/CD, containerization, and security concepts (OAuth 2.0, IAM).
• Excellent communication in English and Polish; willingness to work in a hybrid model in Katowice.

Responsibilities

• Develop and maintain backend services, APIs, and integrations using Kotlin and Spring Boot.
• Translate business and product requirements into scalable backend solutions.
• Contribute to event-driven architectures and asynchronous processing using Kafka.
• Support cloud-native and containerized deployment of services.
• Design and maintain data models and persistence layers with PostgreSQL.
• Collaborate with product, business, and engineering teams to refine requirements and deliver features.
• Contribute to code quality, testing, observability, and reliability.

Skills

Kotlin

Spring Boot

REST APIs

Microservices

Distributed systems

Kafka

PostgreSQL

CI/CD

Containerization

Security (OAuth 2.0 IAM)

English

Polish

Education

Completed university degree in Computer Science

Tools

Kubernetes

AWS

Job description

We are looking for a backend engineer who wants to develop and evolve systems powering product and assortment management within a large retail ecosystem. You will contribute to building scalable backend services and integrations within the assortment management domain, working in an event-driven environment. You will collaborate closely with engineers, product owners, and architects to deliver reliable and maintainable solutions.

Your key responsibilities include:

• Develop and maintain backend services, APIs, and integrations using Kotlin and Spring Boot.
• Translate business and product data requirements into scalable and maintainable backend solutions.
• Contribute to event-driven architectures and asynchronous processing using Kafka.
• Support the 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.
• Medical Care
• Benefits Platform
• Language Courses Platform
• 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 your 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

• Completed university degree in Computer Science or a comparable technical field.
• 3–5 years of professional experience in backend development using Kotlin or Java with Spring Boot.
• Good understanding of REST APIs, microservices, and distributed systems.
• Hands-on experience or exposure to Kafka or similar messaging systems.
• Experience working 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, with readiness to work in a hybrid model 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.

About OBI Smart Technologies

WHO ARE WE:
We are a joint venture between OBI and Reply Group, responsible for co-designing, building and operating mission-critical digital platforms for commerce, customer service, and omnichannel retail.

OUR MISSION:
We unite technology leadership with deep retail vision to implement standardized processes and scalable digital products that drive efficient support for one of Europe’s largest DIY retailers. Leveraging proven best practices, we advance the internationalization of products and the digital mindset of our partners, delivering consistent and business-critical solutions to support the targets of our customer.