Open Jobs

Are you looking for a new challenge and want to be part of the fastest-growing adtech company in Hamburg, Germany?

Junior Go Backend Developer (f/m/d)

  • Hamburg
  • adjoe
  • Playtime Supply
  • Full time
adjoe is a leading mobile ad platform developing cutting-edge advertising and monetization solutions that take its app partners’ business to the next level. Part of the applike group ecosystem, adjoe is home to an advanced tech stack, powerful financial backing from Bertelsmann, and a highly motivated workforce to be reckoned with.

Meet Your Team:

Playtime Supply is building a unique software solution for app and game developers that puts users’ needs first. Instead of traditional monetization mechanisms, Playtime builds an engaging ad experience in which users can play and earn rewards for various new mobile games in Playtime. To predict which mobile game will best suit a user, the team has introduced ML algorithms.

To build this rewarded experience, adjoe’s backend reliably handles more than 200 million users – remaining stable despite impressive growth in the user base. And imagine this: adjoe’s Golang event consumer applications assign rewards equivalent to 700 months’ of time spent in Playtime every day to its users. 

The software depends on two main components.
1) adjoe’s Android mobile SDK – written in a combination of Java and Kotlin – which can be bundled by developers in their apps.
2) The team’s highly scalable Golang backend, which is hosted on AWS and is otherwise responsible for developing a modern React (TypeScript) dashboard that provides adjoe’s clients and Business team colleagues with fast-loading insights.
What You Will Do:
  • Contribute to the development of our backend written +99% in Go and maintain our microservice architecture used to communicate with our frontend (based on TypeScript React). To do this, you’ll use event buses like Kafka, SQS/SNS, and Kinesis in order to have reliable asynchronous microservice communication.
  • Work in a community of developers with whom you’ll share knowledge and contribute to peer code reviews.
  • Continuously search for ways to decrease the API response time for complex queries – we work with a few hundred terabytes of data.
  • Support partners by providing them with raw or aggregated data based on their business needs – we believe in data transparency and well-documented open APIs.
  • Collaborate with our Data Science team to solve complex math problems used to optimize our ML algorithms that are dedicated to delivering the right ads to the right users and integrate their solutions into adjoe’s application.
  • Be responsible for collecting the billions of daily API events and aggregating them in our Kafka and Kinesis streams with the goal of querying them from the data lake in a matter of seconds.
  • Learn in a supportive environment that refines your potential and gives your career a solid foundation.
  • Be part of an international English-speaking team dedicated to scaling our adtech platform beyond our hundreds of millions of monthly active users.

  • Who You Are:
  • You have gained experience working in software development
  • You are a technology nerd and are able to get involved in new, complex topics quickly
  • You have already built web applications in Go
  • Knowledge about databases and a basic understanding of Regular Expressions, HTTP protocol and Encoding
  • Experience working with infrastructure as code (Terraform), Docker and serverless infrastructure is a plus
  • Heard of Our Perks?
  • Tech Package: Create game-changing technologies and work with the newest technologies out there.
  • Work–Life Package: Work remotely for 2 days per week, enjoy flexible working hours and 30 vacation days, modern office in the city center, dog-friendly.
  • Relocation Package: Receive visa and legal support, a generous relocation subsidy, and free German classes in the office.
  • Never-Go-Hungry Package: Graze on regular company and team lunches, free breakfasts, and a selection of free snacks and drinks.
  • Health Package: Get fit with our gym membership subsidy and biweekly yoga classes.
  • Activity Package: Enjoy a host of team events, hackathons, and company trips.
  • Career Growth Package: Dedicated growth budget to attend relevant conferences and online seminars of your choosing.


  • Skip writing cover letters. Tell us about your most passionate personal project, your desired salary and your earliest possible start date. We are looking forward to your application!

    We celebrate diversity and are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or Veteran status.

    Couldn’t Find the Perfect Job Offer?

    We always take interest in meeting new talent.
    Contact Us
    young man smiling into the camera
    Robin
    Ad Ops
    What I really love about working at adjoe is the freedom to innovate. I have the ability to take ownership of all my projects and through this autonomy, I know that my work is trusted which really allows me to do my job in the best way possible.
    young woman smiling into camera with office background
    Barbara
    Strategic Partnerships Manager
    For me, the best part about working at adjoe is our diverse international team. Working with people from all over the world brings different perspectives together, which allows us to approach problems from all angles to find the best solutions.
    young woman smiling into camera with office background
    Janvi
    Strategic Partnerships Manager
    adjoe is a place where I am encouraged and given opportunities to grow professionally. It’s where my work is both challenging and rewarding, and where I am able to build a great social network with my colleagues.
    young manage smiling into camera
    Kostas
    Backend Developer
    At adjoe, I am often confronted with diverse challenges that help me improve my overall technical skills. We also host regular hackathons to explore new technologies so that we are better prepared the future.

    ENJOY OUR BENEFITS

    Fresh Food & Drinks

    Free Gym Membership

    Flexible Working Times

    Modern Hardware: Linux, Mac or Windows

    Hackathons & Meetups

    Monthly Team Events

    Annual Company Trip

    Public Transportation Subsidy

    Free Breakfast

    Dog Friendly

    Starter Kit

    Relocation Support

    Tech Stack
    Athena
    Clickhouse
    Cloudwatch
    Docker
    DynamoDB
    ECS
    Elastic
    Firehose
    Fluentbit
    GitLab
    Glue
    Golang
    Google App Engine
    Grafana
    Javascript
    Kafka
    Kinesis
    Kotlin
    Kubernetes
    Lambda
    MySQL
    nginx
    Npm
    Redis
    Redshift
    S3
    Scala
    Sentry
    Spark
    SQS
    Typescript

    Curious about How It’s All Connected?

    Learn More

    It’s Adtech in Action!

    Read Our Articles