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Senior Data Engineer (f/m/d)

Programmatic Solutions

Full-time

Hamburg

adjoe is redefining the future of mobile ads. Powered by advanced AI, first-party data and world-class engineers, we’ve perfected the offerwall experience for monetizing and scaling app publishers with solutions like Playtime and Arcade – now the fastest growing rewarded advertising channel globally – driving incremental engagement, retention, and revenue. At the same time, we’re breaking into programmatic advertising with the intelligent bidding system of adjoe Ads. Together, this ecosystem connects app developers to over 600 million users worldwide for scalable growth. Backed by a $100 million investment from Bertelsmann and operating from offices in Hamburg, Boston, Singapore, and Tokyo, adjoe is defining the next stages of app and ad experience – right now. Join us.

Meet Your Team: Programmatic Solutions

The Programmatic Solutions team powers adjoe’s real-time ad network solution integrated with leading mobile mediation platforms on both Android and iOS.

Our focus lies in building adjoe’s own Ad Network– a smart bidder leveraging machine learning to optimize campaign performance by predicting conversion probability and lifetime value in real time.

The team is responsible for both the adjoe Ads platform that decides which ad to display and our Android/iOS SDKs that render these ads and provide tracking events to the backend.

We’ve also developed tools through which app publishers can manage their integration, analyze monetization performance, and assess ad user experience through dashboards and APIs.

For potential teammates across all disciplines, working in the Programmatic Solutions team means applying your problem-solving skills in adjoe’s advanced programmatic ecosystem where milliseconds directly impact both revenue and relevance.

What You Will Do

Build & Maintain a Feature Store: Contribute to the design, implementation, and optimization of a scalable, efficient, and easily accessible feature store for machine learning applications.

Develop Scalable Data Pipelines: Build and maintain robust data pipelines that process and transform large-scale event data daily and in near real time within our data lake and feature platform.

Enable High-Impact Features: Extract, clean, and engineer features from raw data to enhance the relevance and accuracy of recommendations in our adtech platform.

Ensure Data Quality, Observability & Integrity: Implement data validation, monitoring, and governance processes to maintain accuracy, consistency, and reliability across all datasets.

Bridge Data Science & Backend Teams: Act as the key link between data science and backend engineering, ensuring seamless data integration and usage across the organization.

Work in an International Environment: Join an international, English-speaking team focused on scaling our adtech platform to new heights.

Who You Are

You have 3+ years’ of software development experience, working on modern data engineering data stack.

You have experience working with Python, SQL. Knowledge of Golang is a plus.

You have experience working on distributed systems that process large amounts of data in real-time.

You know scheduling framework such as Airflow / Kubeflow

You know the concepts of data quality, feature stores.

You have advanced knowledge of computer science, algorithms, and data structures.

You have knowledge of databases and a basic understanding of regular expressions, HTTP protocol, and encoding.

Plus: You have experience in working with Clickhouse, AWS, Terraform.

Our Tech Stack

Apache Kafka as our data bus system

Go as our primary language for backend

Kubernetes and Terraform to manage our infrastructure

S3, Redis and Druid as data storage

ClickHouse as feature store

Prometheus, Grafana, and OpenObserve for logging and monitoring

Airflow for orchestration.

… and we’re always open to trying new technologies that suit each case best.

Fuel for the Journey: Benefits to Support Your Ambitions

Invest in Your Future: Regular feedback and our development program support your growth, helping you expand your skill set and achieve your career goals.

Easy Arrival to adjoe: From signing to settling in Hamburg, we’ve got you covered. Need a visa? No problem. Ready to build your new life and career at (company name) in Hamburg? We support every ambition—from learning German to a relocation bonus that helps you settle in and make Hamburg feel like home.

Live Your Best Life, at Work and Beyond: We work in a hybrid setup with 3 core office days, plus flexible working hours. Enjoy 30 vacation days, 3 weeks of remote work per year, and free access to an in-house gym with lots of different fitness classes and mental health support through our Employee Assistance Program (EAP).

Thrive Where You Work: Enjoy the Alster lake view from our central office with top-notch equipment, fun open spaces, and a large variety of snacks and drinks.

Join the Community! Participate in regular team and company events, including hackathons and social gatherings. We work together, and we celebrate together, too.