Backend Engineer (Kotlin, Spring Boot, Kafka)

Reply, Inc.

Katowice

Hybrid

PLN 180,000 - 260,000

Full time

14 days+

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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.