Senior Backend Engineer - Sorting (all genders)

ABOUT YOU; Hamburg; Vor Ort; EUR 85.000 - 110.000; Vollzeit

Zusammenfassung

ABOUT YOU, based in Hamburg and Berlin, is a fast-growing fashion-tech company redefining online shopping. We are seeking a backend engineer to own ranking systems, blend ML with business logic, and build a fast, fair, high-throughput engine for product sorting.

You will design batch pipelines from BigQuery to Postgres/MySQL and develop low-latency APIs with Fastify/TypeScript, collaborating across data, product, and commercial teams. Fluency in English is expected.

Qualifikationen

• Deep ownership of ranking/product quality.
• 5+ years backend experience (Node.js/TypeScript preferred)
• Strong SQL knowledge (Postgres/MySQL)
• Good algorithmic intuition for sorted data and latency trade-offs
• Ability to bridge backend engineering and ML for live ranking
• Clear English communication and pragmatic problem solving

Aufgaben

• Shape how millions of users see products by blending ML model outputs with business logic (campaign boosts/sponsored items).
• Build and own the high-throughput ranking engine (Spotsetter) ensuring fast, deterministic, and fair product sorting.
• Design reliable batch write pipelines streaming BigQuery data into Postgres/MySQL.
• Develop low-latency serving APIs with Fastify and Node.js/TypeScript.
• Collaborate with data engineers, product managers, and commercial teams to drive data-driven ranking decisions.
• Maintain architectural freedom, work with the Tech Lead, and keep the codebase clean.

Jobbeschreibung

Company Description

ABOUT YOU is one of Europe’s fastest growing e-commerce companies. Based in Hamburg and Berlin, we operate at the intersection of fashion and technology. Our mission is to rethink online shopping and make it personal and seamless. This takes more than good ideas. It takes people who take initiative and challenge the status quo. We believe in flat hierarchies, direct communication, and pragmatic decisions. No long approval chains. Just ownership, trust, and clear responsibility. We work hard, but we also believe in enjoying the ride together - over team lunches, afterwork drinks, company events, or a quick coffee in between meetings. If this sounds like you, ABOUT YOU could be the right place to bring in your perspective.

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.

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.