Backend Engineer

Appunite; Poznań; Hybrid; PLN 156,000 - 223,000; Full time

Benefits offered by this job

Remote work with Poznań/Warsaw/Kraków/

Office access in Poznań, Warsaw, Krak

Quarterly on-site visits (Poznań or W

Job summary

Appunite in Poland is seeking Kotlin Engineers to join our expanding team and take responsibility for end-to-end development of client sites across Europe. You will shape the user experience by delivering features in Kotlin and Java, backed by a strong Spring Boot, microservices, and APIs foundation.

Work across the stack with a collaborative cross-functional group, documenting decisions with KPIs and business value, and applying DDD and event-driven patterns to scale services.

Qualifications

• Commercial experience coding in Kotlin or Java.
• Solid Spring Boot experience to build scalable microservices and RESTful APIs.
• Willingness to learn Kotlin for new services and work with AI-assisted tools.

Responsibilities

• Own a project end to end, driving design, production and beyond.
• Collaborate across teams for listings, product pages and APIs, documenting value and KPIs.
• Work across the stack: frontend, backend, and some networking as an engineer.
• Learn and apply DDD and event-driven architecture in practice.

Skills

Kotlin

Java

Spring Boot

REST APIs

Microservices

DDD

AI tools

Polish & English

Job description

The cooperation which stayed from startup to full-blown profitable product team!

Be a part of the biggest e-commerce platform in Poland and one of most recognizable in Europe with almost 200 mln MAU, which exists for over 20 years.

Our mission is to deliver the best possible customer experience across all platforms: web and mobile. From the moment customers visit our site to browsing, searching, comparing listings, purchasing, and post-purchase services, we ensure seamless, fast, and reliable operations.

We are looking for a talented Kotlin Engineers to join our team and take responsibility for the development and maintenance of certain areas of clients product and its European versions.

As a Java Engineer, you will work in a dynamic environment with a team that aims to continuously improve and develop the platform. Your role will be focused on select areas of the clients site, which means responsibility will be dispersed across the team, and you will have a real impact on shaping the user experience.

What we offer

• Salary: 14 000 - 20 000 PLN net on B2B - depending on your experience
• Growth in DDD and event-driven architecture, built into how our services work, plus Kotlin, BigQuery, microservices and AI tools in daily work
• Remote work with office access in Poznań, Warsaw, Kraków and Toruń. We ask for an on-site visit to Poznań or Warsaw 1-2 times per quarter.

What you'll do

• Own a project end to end. Everyone on the team has their own area of responsibility. You won't be waiting for the next ticket, you'll be driving the work from design to production and beyond.
• Work across teams. You'll partner with the teams behind the listing form, the product page and the API. That means documenting why the change matters (arguments, KPIs, business value), negotiating details, and sometimes contributing directly to their repositories while they review your code. You'll have support: the team knows which doors to knock on, and the toughest conversations won't land on you alone.
• Work across the stack. Frontend, backend and some networking. This is an engineer's role, not just a coder's.
• Learn DDD and event-driven architecture in practice. The team's services follow these standards, and knowledge is shared actively, including through workshops.

We are seeking individuals who:

• Have commercial experience coding in Kotlin or Java (with an eagerness to master Kotlin for our new services);
• Possess solid commercial experience with the Spring Boot ecosystem to build scalable microservices and RESTful APIs;
• Value high-quality code and engineering best practices to solve complex challenges in massive-scale distributed systems;
• Are open-minded, adaptable, and eager to step outside your comfort zone to explore unfamiliar tech stacks (e.g., frontend is a nice-to-have)
• Are adept at utilizing AI-powered tools to accelerate coding, debugging, and research in your daily workflow;
• Communicate effectively in Polish and English (at least a B2 level).

What does the recruitment process look like?

The recruitment process is carried out in collaboration with our client, which might occasionally extend the timeline.

We kindly ask for your understanding and patience in this regard.

1. Video interview with our Recruitment Team (abt 45 minutes)
2. Video interview with Engineer from the project (abt 90 minutes)
3. Short final check with Team Leader (20-30 min).
4. And finally, the decision, after which we can say "welcome on board."