SENIOR BACKEND ENGINEER (JAVA, KOTLIN, SPRING BOOT, AWS) in Katowice

We are 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 take

ownership

of

backend architecture

and

system evolution

within the

assortment management domain , building

scalable services

and

integrations

across a complex, event-driven enterprise landscape. You act as a technical driver within the team, working closely with architects, product owners and stakeholders to deliver robust, high-quality solutions.

Your key responsibilities include:

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.

Medical Care

Benefits Platform

Language Courses Platform

Company Events

Salary range for Employment Contract: 13 000 - 22 000 PLN gross/month.

Motivizer Benefits Platform

to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical 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 further training opportunities - both internally and from

external providers.

We support your ongoing learning and development.

Cooperation within an

internal community

is our everyday reality. We have networking events, coding challenges, and company parties

for different occasions.

Qualifications

Completed university degree

in

Computer Science

or a comparable technical field.

6+ years of professional experience

in

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 ) 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 .

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."