Nexer Czech Republic is a division within DANIR AB – an IT consulting and R&D company. We have the opportunity to work with world‑renowned brands from Scandinavia, the USA, the UK, and Western Europe. Our goal is to grow strong but rather in competencies than in numbers.

If you like what we do, see our offer — maybe it is you we will have the pleasure to meet! :)

About the Role

We are looking for a Senior Backend Developer to join a long‑term project for a major international company. You will work on modern application development using Kotlin, Spring Boot, and Kafka, contributing to a microservices‑based ecosystem running in the cloud. The role involves building reliable, scalable services, ensuring clean technical design, and collaborating closely with cross‑functional engineering teams.

What You Will Do

Develop backend services in Kotlin using Spring Boot
Design and build applications in a microservices environment
Work with Kafka for asynchronous communication
Collaborate on system design and architecture discussions
Implement REST APIs and integrate with internal services
Work in a cloud-native environment using AWS and Kubernetes
Write unit, integration, and end‑to‑end tests in Kotlin ecosystem
Use Git for version control and follow clean coding standards
Ensure responsible and effective adoption of AI tools where relevant
Work closely with other developers, architects, and product teams
Participate in code reviews, technical discussions, and knowledge sharing

Who You Are

At least 5 years of experience as a Backend Developer
Excellent knowledge of Kotlin, Spring Boot, and SQL (PostgreSQL preferred)
Hands‑on experience with Apache Kafka
Strong understanding of microservices design and asynchronous communication
Comfortable working in a cloud environment (AWS preferred)
Experience working with Kubernetes, Git, and REST APIs
Skilled in writing high‑quality automated tests
Strong communication skills, proactive teamwork, and ownership mindset
Passionate about clean, maintainable, easy‑to‑read code
Knowledge of responsible usage of AI models to improve efficiency
Fluent English (C1), both spoken and written
Based in Czechia, Slovakia or Poland to support collaboration and occasional team meetups

Must Have

Kotlin
SQL (PostgreSQL preferred)
Spring Boot
Kafka

Good to Have

Kubernetes
AWS

Assignment Details

Workload: Full time
Location: Czechia, Slovakia, Hungary (remote)
Contract type: B2B
Client: A leading global company (name not disclosed)

Why Nexer

At Nexer, competence and curiosity come first. We collaborate with leading global brands and offer meaningful, transformative projects where your expertise truly matters. You’ll join a culture that encourages innovation, ownership, and continuous professional growth.

Apply

If this sounds like your next challenge, we would be delighted to meet you.
Apply today — your promising future might start here.

About Nexer Group

Nexer as an employer

If you work at Nexer, you get a bold and entrepreneurial employer with an international presence. We take pride in leading the digital revolution and being at the forefront of technology, always with an agile and forward-looking approach. With us, you get unique opportunities to dream big, act smart and develop. As a family-owned company, we own our strategy and invest in long-term goals, and we encourage employee involvement and ideas. In addition, we offer a flexible work policy, where it’s possible to work remotely when it suits you and your assignment.

Our culture

Our vision is Promising future – it’s important for us to make a difference and contribute to a better future. We are committed to our customers and have a sincere concern for each other. We embrace diversity and believe that people with different backgrounds and experiences make our work and our company better. We value innovation and the will to develop and take the next step, onwards and upwards. And most importantly – we have fun at work!

Senior Backend Engineer (Kotlin/Spring Boot)