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Senior Kotlin Software Engineer (ADS API)

  • Kraków
  • Kraków

Feeling confident with your Kotlin skills? Eager to start working on a brand new project, with modern stack and architecture, where you can have a real impact?

Then we are definitely looking for you!


As part of the Ad Engineering unit, the Ads API is one of the teams responsible for development of the in-house advertising system, used by the internal sales organisation across Schibsted and offering direct booking of advertising campaigns to external customers. Our mission critical systems are accounting for around 150 million Euros in advertising revenue for the Schibsted group.

Our team is a key link between the booking systems and the adserver, delivering solutions such Booking, Inventory and Publisher APIs and providing support to other parts of the Schibsted’s ad ecosystem.

The team currently consists of 3 backend developers, based in Cracow, but we are looking for at least two more to join it. The development team is fully responsible for the product from the technical point of view, being able to decide on the architectural choices, libraries used and solutions built. We collaborate closely with other product and development teams within our business unit and with the ad-serving solution of choice - Xandr.


We are looking for an experienced backend software engineer, with at least 2 years of experience in Kotlin programming, preferably within the microservice ecosystem.
We search for someone confident with Kotlin and system design skills, willing to share knowledge and expertise with the rest of the team.

Our current stack is based on Scala, so it would be great if you are familiar working with that technology; it’s not a must though as we are just kicking off a large-scale brand new Kotlin-based project, which will be our main focus area for 2021.

As part of the Ads API team, you will be responsible for developing and maintaining Booking, Inventory and Publisher APIs, working closely with other engineering teams both within Schibsted and responsible for delivering 3rd party tools we use (p.ex. Xandr ad serving).

In your daily work, you will be mainly focused on coding - delivering on the new requested functionalities or services, but also spend quite some time on innovation - looking into new business opportunities, researching and building POC.

To become fully operational within your role and staying up to date, you will also have to check third-party documentation, support users, debug, maintain and operate the system as well as acquire knowledge from the ad-tech domain.

Once you learn the system, together with the rest of the team, you will continuously work on its technical evolution, scaling and simplification. We hope you will be able to take an active part in deciding how to implement new features and what architectural decisions to make.


  • In your current role, you are a seasoned backend software engineer working with Kotlin on a daily basis

  • You are well-versed in distributed systems based on microservices architecture, you are also familiar with event sourcing and DDD

  • You understand and cherish functional programming principles

  • You have experience working with most of those technologies: AWS, Kinesis/Kafka, AWS Lambda, Docker, Kubernetes

  • You are comfortable with relational and non-relational databases in general and PostgreSQL, DynamoDB in particular

  • You are willing to actively contribute to system design and architecture

  • You have at least professional working proficiency in English

  • Previous experience working with Scala is also a plus

  • It would be great if you have experience working with advertising products, ad-serving in particular

Great Place to Work

  • Social benefits (multisport, health care etc)

  • Individual training budgets

  • In-house English lessons

  • Flexible working hours

  • Relocation package

  • 4 additional vacation days

  • 2 additional weeks of paternal leave

  • Modern tools and needed equipment

  • Ergonomic workplace

About the company

Schibsted Tech Polska is a programming hub, creating mobile & web applications for the best Scandinavian start-ups & media companies. With more than 200 employees combined in Kraków & Gdańsk, we're focused on developing news, marketplaces web & online applications, as well as helping Scandinavian startups to improve their business.

We're a Scandinavian company in mind - with a flat structure, modern technology stack and a mutual trust as a pillar of our great atmosphere.

Ewelina Piłat | Contact Person

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Schibsted Tech Polska

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