Zalando SE: Senior Software Engineer (High Load Systems) - ZMS at Zalando SE (Berlin, Germany) (Berlin, Germany)

Posted: Jan 15, 2020

As a Senior Software Engineer, High-load systems you will work on low-latency/high-load backend system powered by Machine Learning.


Zalando's Sponsored Product offering is at the forefront of Zalando's platform strategy. We want to create a better customer experience by giving our brands more control over when and how their product is shown. At the same time, we want to optimize this process through Zalando's data.

Every time a customer searches for products on Zalando, a bidding request is sent to our system in real-time. The system aggregates relevant data points, evaluates thousands of candidate ads with our machine learning models, and decides what product to show where - all within 10-30 ms. Every second, we process hundreds of thousands of such requests.

Come work with us on challenging technical topics, such as concurrent programming, distributed databases, high-load engineering, high availability, big data analytics, stream processing, control theory, auction theory, productionalizing of machine learning models and more - together with brilliant colleagues from all over the world!


  • Design & develop low-latency, high-load, real-time bidding system end-to-end

  • Optimize stochastic behaviors of the system based on online experiments (through budget pacing strategies, content filtering strategies etc.)

  • Mentor and grow junior and mid-level members of the team

  • Collaborate with brilliant Product Managers, Data Scientists, Engineers and Analysts across Zalando to create positive customer impact together

  • Help define our team's objective. Continuously improve the self-organization of the team.


  • 3+ years of experience in designing and developing highly available (24x7) high-load distributed systems, preferably in Java

  • Expertize in concurrent programming (multi-threading), network programming, distributed databases, microservice architecture are important

  • Systems programming experience will be highly valued (low-level programming skills, hardware awareness, good knowledge of JVM internals, Java Memory Model etc.)

  • Experience in Python, Scala and big data technologies like Spark / Presto / Storm / Flink / Kafka / Redshift / Vertica / Airflow etc. are a strong plus

  • Knowledge of container technologies like docker, kubernetes as well as knowledge in cloud computing (AWS, GCP) is a plus

  • Experience in relational databases (PostgreSQL, MySQL etc.) and application frameworks (Spring Boot, Dropwizard etc.)


  • Culture of trust, empowerment and constructive feedback, open source commitment, 70+ internal technical and fun guilds, knowledge sharing through tech talks, internal tech academy and blogs, product demos, parties & events

  • Competitive salary, employee share shop, 40% Zalando shopping discount, discounts from external partners, centrally located offices, great IT equipment, flexible working times, additional holidays and volunteering time off, free beverages and fruits.

  • Extensive on-boarding, mentoring and personal development opportunities and an international team of experts

  • Relocation assistance for internationals

We celebrate diversity and are committed to building teams that represent a variety of backgrounds, perspectives and skills. All employment is decided on the basis of qualifications, merit and business need.


Zalando Marketing Services (ZMS) is the 360° marketing unit of Europe ’s leading online platform for fashion and lifestyle, Zalando. We work with the world’s largest fashion and lifestyle brands and provide them with impactful solutions across all marketing touchpoints, access to relevant audiences and in-depth data knowledge, as well as inspiring creation and content.

At ZMS we create meaningful connections between brands and consumers through a deep understanding of their personalities. We work with brands, agencies and publishers from fashion and beyond to produce innovative, impactful campaigns that reach the right audience at the right moment. Thanks to its holistic mix of cutting-edge and privacy compliant technology, in-depth audience insights, expansive reach and compelling content brands produce successful campaigns across multiple digital marketing channels.

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