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Stephan HähneSH

Stephan Hähne

Data Scientist

650 €/Tag
Hamburg, DE
8-15 Jahre

Durchschnittliche Reaktionszeit: 1h

Über Stephan

Ich bin erfahren in dem Lösen von Optimierungsproblemen durch mathematische Modellierung, Implementierung in Solvern (wie OR-Tools) und Umsetzung in Produktionscode. Dabei lege ich Wert auf qualitativen Code und Testen durch Simulation.

Ich bin eine zugänglich Person, mir der man gut zusammenarbeiten kann. Zusätzlich bringe ich eine analytische und strategische Denkweise mit.
  • Deutsch

    Muttersprachlich oder zweisprachig

  • Englisch

    Konversationssicher

Nur remote
Führt Projekte hauptsächlich remote aus

Projekt- und Berufserfahrung

  • Selbstständig
    AI Engineering
    August 2025 - Heute (10 Monate)
    Hamburg, Germany
    • ● Prototyped agentic AI workflows using LangChain and LangGraph.
    • ● Built LLM-powered systems integrating GPT-4, Claude, and open-source models with custom business logic and workflow orchestration.
    • ● Conducted independent research and experimentation in latent chain-of-thought models and their theoretical underpinnings, inspired by the latest ICML/NeurIPS work on mechanistic reasoning.
    • ● Contributing to open-source benchmarking, code replication, and synthesis of insights between machine reasoning and cognitive neuroscience.
    Langchain LangGraph Research Python (Programming Language)
  • Oaktree Technologies GmbH (Fielmann Group)
    Senior Applied Scientist
    März 2020 - Juli 2025 (5 Jahre und 4 Monate)
    Hamburg, Germany
    • ● Designed and deployed a MILP-based planning system for capacity allocation and workload scheduling across German and Chinese manufacturing facilities, reducing production costs by 15–20% and lowering lead times.
    • ● Partnered directly with the CPO and engineering teams to frame executive-level operational challenges (capacity, orders, cost constraints) into tractable mathematical models, successfully transitioning prototypes from Python to Kotlin production systems.
    • ● Implemented a simulation framework to evaluate system behaviour under increased demand, enabling scenario analysis and capacity stress-testing, the same analytical pattern underlying wait-time.
    • ● Developed SQL-based analysis of optimization outputs and tradeoffs to support management decision-making, with results visualized in operational dashboards.
    • ● Implemented SLAM-based computer vision algorithms (OpenCV, PyTorch) for sensor measurement, demonstrating an ability to contribute across engineering domains adjacent to core OR work.
    Mathematical Modelling Operations Research Implementierung SLAM Solver
  • Yieldlove GmbH
    Data Scientist & Optimization Engineer
    November 2017 - April 2018 (5 Monate)
    Hamburg, Germany
    • ● Analyzed large-scale revenue and impression data to inform bid-price optimization across connected ad-auction platforms, representing an early form of real-time marketplace pricing.
    • ● Built the technical infrastructure to support automated pricing APIs, revenue data pipelines, and ad configuration systems (Python) connected to external platforms reducing system error susceptibility by 20%.
    • ● Systematized legacy implicit optimization logic for pricing, revenue modeling, and ad configurations into transparent, scalable frameworks, empowering management with independent decision-making capabilities.
    • ● Translated complex data patterns into clear trade-offs and strategic recommendations for the CEO, helping shape product roadmap priorities and technical scaling decisions.

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Ausbildung und Abschlüsse

  • Diplom-Mathematik (M.Sc.
    University of Bonn
    2011
    Diplom-Mathematik (M.Sc.
  • Undergraduate Studies
    University of Bonn
    2006
    Undergraduate Studies

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