Backend Java/Kotlin Engineer

Ljubljana, Slovenia · Engineering expand job description ↓


At Zemanta we're building the most advanced native advertising platform in the world. Marketing agencies love our dashboard - they use it to run native advertising campaigns that reach millions of people every month. Offering them the tools they need to be successful is our main priority, so we are expanding our engineering team to take our platform to the next level.

In July 2017 Zemanta joined Outbrain (the world's largest content recommendation company) on their mission to help anybody discover great content.

We're looking for a backend java/kotlin engineer to help us with a very exciting challenge. We are building a new team focusing on JVM stack (the first at Zemanta!). The team will take ownership over a set of services that are used for synchronisation of data between Zemanta's and Outbrain's systems. These are very high throughput services, handling tens of thousands of ad campaigns and tens of millions of ad impressions per day, built with Java, Kotlin, Mysql, Cassandra, Kafka and Hadoop.

In this position you will get a great opportunity to be a founding member of the new team, solve hard problems and work in a global environment (with Outbrain's Israeli engineers) on a daily basis.

What it's like to be an engineer at Zemanta?

We solve hard problems:
like processing 250k bid requests per second efficiently, keeping thousands of advertising campaigns in sync across multiple 3rd party systems, managing a database with billions of entries and 100k qps, and extracting statistics from terabytes of daily raw data to display them in a nice UI table with thousands of editable rows.

We use the right tools for the job: Our stack consists of proven tools: Java/Kotlin, Python with Django, Javascript/Typescript with Angular, Go, AWS, GCP, Kafka, Aerospike, PostgreSQL, Hadoop, Docker, InfluxDB, Grafana, Chef. We use Github for managing code, Trello for keeping track of projects and Slack to tie it all together.

We build things that matter to our users: Engineers work closely with our Customer Success team to understand how our customers use our product. This helps us make better decisions when building new features.

We care about quality: We don't just want things done, we want them done right. We cannot imagine life without continuous integration, one-click automated deployments, code reviews, technical specs, architecture design reviews and unit tests. We find beauty in simple and elegant solutions and flexible architectures.

We push people out of their comfort zone: If you want to grow, you'll get all the responsibility you can handle. Our engineers take full ownership over projects, which includes everything from defining a solution with product managers, planning, architectural design, implementation, testing, deployment and maintenance. If this sounds overwhelming, don't worry - you'll get plenty of support from more experienced members of the team.

We are a small team with global impact: Since joining Outbrain we've become a part of a global engineering team, which opens up lots of new opportunities for us. We collaborate with engineers and product managers based in Tel Aviv on a daily basis. That said, we're still Zemanta - a closely-knit team with distinctive identity.

We constantly try to improve: We share knowledge through internal weekly tech talks, postmortems, code reviews, blog posts and meetup talks.


  • Good knowledge of modern backend development, databases, basic data structures and most common design patterns.
  • Ability to write clean, maintainable, well-tested production code.
  • A strong desire to learn and grow as a member of a talented engineering team.
  • You lean towards simple and effective solutions and are allergic to over-engineering.
  • You set very high standards for yourself and you are constantly improving your skills.
  • We expect you to like working with people - you'll be doing that a lot.
  • You are a reliable, trustworthy person that keeps their promises and takes responsibility for their actions.
  • Having experience with our stack is a plus, but not mandatory - we value talent, strong fundamentals and dedication to excellence more than the tools you've used.


We care deeply and invest heavily into our team, setting everybody up for growth and success. In addition to being a part of a great team, working in a fast-paced startup environment, learning from other smart people and skyrocketing your skills, we offer:

  • International environment: work with world-class Outbrain engineers based in Tel Aviv and New York
  • Full-time employment with an attractive salary package
  • Stock options plan
  • Traveling to world's leading software engineering conferences every year and learning from the best
  • A laptop and other equipment of your choice
  • Opportunity to give back to community - by open-sourcing code, giving talks and sharing knowledge through our tech blog
  • Flexible working hours and an ability to work from home occasionally
  • Free access to the gym and pool across the street to keep you in shape

Not from Ljubljana? No problem - if you're the right person for the job, we will help you with your relocation.

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