Senior Backend Engineer - Sorting (all genders)
About You SE & Co. KG15 hours ago
Hamburg, Germany or Berlin, GermanySenior
Responsibilities
- Build and own the high-throughput Spotsetter product-ranking engine.
- Blend ML model outputs with business logic such as campaign boosts and sponsored items.
- Design reliable batch write pipelines from BigQuery into Postgres and MySQL.
- Develop low-latency serving APIs with Fastify and Node.js/TypeScript.
- Apply schema design, query optimization, batch operations, deduplication, and constraint logic.
- Collaborate with data engineers, product managers, and commercial teams on data-driven ranking decisions.
- Maintain a clean codebase and contribute architectural ideas in collaboration with the Tech Lead.
Requirements
- At least 5 years of experience with backend systems.
- Strong hands-on SQL knowledge, including Postgres/MySQL schema design, query optimization, and batch operations beyond basic ORMs.
- Strong algorithmic intuition for sorted data, deduplication, latency trade-offs, and constraint logic.
- Interest in bridging backend engineering and ML by serving model scores or ranking data in live systems.
- Node.js/TypeScript experience is preferred; candidates with Java, Go, or Kotlin experience are also welcomed.
- Clear communication skills in English and a pragmatic, solution-oriented mindset.
- 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
- The posting directs applicants to the company benefits page for details.
- The company emphasizes an inclusive workplace and values acceptance, inclusion, ownership, trust, flat hierarchies, and direct communication.
- Employees may participate in team lunches, afterwork drinks, and company events.
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.