ABOUT YOU

E-commerce fashion retailer offering personalized recommendations

Senior Backend Engineer - Ranking Systems, All genders

Backend EngineeringConfirmed live in the last 24 hours

Full-time€70k - €85k /yrHybrid

About the Job

Requirements

At least 5 years of experience building scalable APIs using technologies such as Node.js, Python, or Go.
Recent practical experience with a typed programming language such as TypeScript.
Knowledge of SQL or NoSQL databases.
Ability to write well-structured, efficient, and maintainable code and maintain code quality.
Ability to work in an English-speaking and agile environment.
Experience taking deep ownership of a product and proactively proposing improvement ideas.

Responsibilities

Develop product-stream sortings incorporating user signals using Node.js with TypeScript.
Manage extensive data volumes using Google BigQuery and integrate with business intelligence systems and the data platform.
Build and enhance high-traffic APIs with minimal latency.
Collaborate with engineers, product managers, data scientists, and analysts to improve existing functionality and launch new features.
Explore new technologies and methodologies, particularly machine learning and generative artificial intelligence.

Desired Qualifications

Experience with centralized logging, monitoring, and alerting solutions such as Datadog.
Experience with a cloud ecosystem such as Amazon Web Services or Google Cloud Platform and orchestration services such as Dagster or Airflow.
Experience with Elasticsearch or OpenSearch.
Experience building data models using dbt.
Experience running data-processing pipelines using distributed data-processing frameworks.
Hands-on experience with machine learning models or large language model-based systems.

Job Description

Shape how millions of users see products by blending ML model outputs with business logic (like campaign boosts or sponsored items)
Build and own our high-throughput ranking engine ("Spotsetter") to ensure fast, deterministic, and fair product sorting
Design reliable batch write pipelines that stream data from BigQuery straight into high-performance relational stores like Postgres and MySQL
Develop low-latency serving APIs with Fastify and Node.js/TypeScript
Work closely with data engineers, product managers, and commercial teams to make data-driven ranking decisions
Architectural freedom: collaborate with our Tech Lead, bring in your own ideas, and keep our codebase clean

Qualifications

You love digging into ranking problems, taking deep ownership of a product, and seeing your changes move real business metrics
5+ years of experience with backend systems (Node.js/TypeScript preferred, but we welcome fast learners from Java, Go, or Kotlin)
Strong hands-on SQL knowledge (Postgres/MySQL schema design, query optimization, and batch operations beyond basic ORMs)
Good algorithmic intuition for sorted data, deduplication, latency trade-offs, and constraint logic
You're excited to bridge backend engineering and ML by serving model scores or ranking data in live systems
Clear communication skills in English and a pragmatic, solution-oriented mindset

Nice to Have

Experience with job queues (BullMQ, Redis) or batch processing pipelines
Exposure to cloud tooling (AWS Step Functions, CDK, GCP/BigQuery)
Background in e-commerce, sponsored products, or ad-tech systems
Curiosity about learning-to-rank algorithms

Additional Information

Your perks at a glance: Visit our benefits page.

Simply apply online via our career page - we will get back to you as soon as possible!

A Place Where You Can Be You
We take it as our responsibility to create an environment where everyone feels welcome, exactly as they are.
Different backgrounds and perspectives make us stronger and shape our culture in ways that matter.
What we stand for internally, we stand for as a brand: acceptance, inclusion, and a fairer approach to fashion.

Compensation: 70000 to 85000 (EUR) (YEARLY)

About the Company

ABOUT YOU

E-commerce fashion retailer offering personalized recommendations

ABOUT YOU is an online fashion retailer that offers a wide range of clothing, shoes, and accessories from over 2,000 top brands. The company serves fashion-conscious women who follow the latest trends and styles. It runs on an e-commerce website that provides a seamless shopping experience with a user-friendly interface, easy ordering, and multiple payment options. Revenue comes from selling products directly to consumers, often supported by promotions and discounts. Data analytics power personalized shopping by recommending items based on individual preferences and browsing history. Compared with competitors, ABOUT YOU stands out with its expansive brand selection, data-driven personalized recommendations, frequent promotions, and a focus on a smooth online experience. The company's goal is to help customers discover and buy the latest fashion items efficiently while driving sales through tailored offerings.

Company size: 1,001-5,000
Company stage: IPO
Headquarters: Hamburg, Germany
Founded: 2013

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