Senior Engineer (Backend & Data) (m/f/d)

• Make optimization runs fast enough that customers iterate in minutes, not hours — across problems an order of magnitude larger than today
• Build the data backbone: ingest SAP/ERP exports, Excel reality, and operator knowledge into a clean, versioned, traceable model layer
• Design the math model infrastructure with our scientists that lets non-engineers compose new optimization models without ever writing solver code
• Take us from single-pilot infrastructure to multi-tenant production — without losing determinism or auditability.
• Set engineering standards with Erik. Be the second voice in architectural decisions. The only voice when he isn't there.

• 5+ years building backend or data-intensive systems in production — distributed compute, ETL, caching, real workloads
• Industry experience — you've built data or optimization systems for or inside manufacturing, supply chain, energy or logistics. Large ERP/MES exports don't scare you
• Hands-on with optimization, solvers or operations research — Gurobi, CPLEX, HiGHS, OR-Tools, AIMMS or comparable. Bonus: shipped solver-heavy systems to paying users
• Strong in Typescript and deep in Python; comfortable reaching for Rust, C++ or similar when performance demands it
• Deep interest in semantic modeling, knowledge graphs, math models
• German at C1 level or higher, full working English
• Cologne-based or willing to relocate

Benefits

• Significant skin in the game through the freedom and full cycle ownership at the forefront of the technology core
• Direct line to Erik and Dana; you shape architecture, you don't execute someone else's
• Option of equity package (VSOP)
• You can choose your own tech setup on how you develop best
• Sports membership is fully covered, as we always care about health when working hard