Senior Backend Architect (Kotlin/Spring Boot, AWS)

Reply; Katowice; Hybrid; PLN 260,000 - 360,000; Full time

Benefits offered by this job

Motivizer Benefits Platform

Language Courses

Training opportunities

Networking events

Job summary

OBI Smart Technologies in Katowice is looking for a strong backend engineer who wants to design and scale core systems powering product and assortment management across a large retail ecosystem. You will own the backend architecture and system evolution within the assortment management domain, building scalable services and integrations in an event-driven enterprise landscape.

As a technical driver, you will collaborate with architects, product owners and stakeholders to deliver robust,

Qualifications

• Completed university degree in Computer Science or a comparable technical field.
• 6+ years of professional backend development with 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) in scalable environments.
• 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, with readiness to work in a hybrid model in Katowice.

Responsibilities

• Design and develop scalable backend services, APIs and integrations using Kotlin and Spring Boot within distributed systems.
• Translate complex business and product data requirements into robust, maintainable and scalable system designs.
• Lead the design and evolution of event-driven architectures and asynchronous processing using Kafka.
• Design and integrate backend systems within AWS and Kubernetes-based enterprise environments.
• Drive data modeling and persistence strategies using PostgreSQL and cloud-native approaches.
• Act as a technical interface between business, product and engineering teams, leading solution design and backlog refinement.
• Drive engineering best practices, observability, reliability and architectural consistency across the platform.
• Lead troubleshooting, optimization and continuous improvement initiatives while mentoring less experienced engineers.

Skills

Kotlin

Spring Boot

REST APIs

Microservices

Distributed systems

Event-driven

Kafka

CI/CD

Observability

OAuth2

IAM

English

Polish

Hybrid work

Katowice

Education

Computer Science degree

Tools

AWS

Kubernetes

Amazon EKS

PostgreSQL

CI/CD tooling

Observability tooling

Security concepts

Job description

OBI Smart Technologies in Katowice is looking for a strong backend engineer who wants to design and scale core systems powering product and assortment management across a large retail ecosystem. You will own the backend architecture and system evolution within the assortment management domain, building scalable services and integrations in an event-driven enterprise landscape.

As a technical driver, you will collaborate with architects, product owners and stakeholders to deliver robust,