Senior Backend Engineer - Sorting (all genders)
About You SE & Co. KG1 day ago
Hamburg, Germany or Berlin, GermanySenior
Responsibilities
- Build and own the high-throughput Spotsetter ranking engine for fast, deterministic, and fair product sorting.
- Blend ML model outputs with business logic such as campaign boosts and sponsored items.
- Design batch write pipelines that stream data from BigQuery into Postgres and MySQL.
- Develop low-latency serving APIs using Fastify and Node.js/TypeScript.
- Apply ranking, deduplication, constraint, and latency logic to live systems.
- Collaborate with data engineers, product managers, commercial teams, and the Tech Lead on data-driven ranking decisions.
- Maintain a clean codebase and contribute architectural ideas.
Requirements
- 5+ years of experience with backend systems, preferably using Node.js and TypeScript.
- Strong hands-on SQL skills, including 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.
- Experience or interest in serving ML model scores or ranking data in live systems.
- Clear communication skills in English and a pragmatic, solution-oriented mindset.
- Experience with Java, Go, or Kotlin is welcomed for candidates who can learn the preferred stack quickly.
- Experience with BullMQ, Redis, or batch processing pipelines is a plus.
- Exposure to AWS Step Functions, CDK, GCP, or BigQuery is a plus.
- Background in e-commerce, sponsored products, or ad-tech systems is a plus.
- Curiosity about learning-to-rank algorithms is a plus.
Benefits
- Architectural freedom, ownership of a product, and the opportunity to influence business metrics.
- Inclusive workplace focused on acceptance, inclusion, and diverse perspectives.
- Flat hierarchies, direct communication, pragmatic decisions, and clear responsibility.
- Team lunches, afterwork drinks, company events, and informal coffee gatherings.
- Based in Hamburg and Berlin; applicants apply online via the career page.
Tech Stack
Categories
About About You SE & Co. KG
ABOUT YOU SE & Co. KG operates an online fashion marketplace for European consumers and licenses commerce technology to brands via its SCAYLE platform. The group sells apparel and lifestyle products through its mobile app and aboutyou.com, and offers a cloud-based enterprise shop system under a license model to retailers. Founded in 2014 and headquartered in Hamburg, it is a publicly listed company.