Happyhotel

Senior Machine Learning Engineer (m/f/d)

Offenburg full-time Mid Salary not listed
full-time Mid level Technology & IT Curated
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About the role

Your Role
As a Senior Machine Learning Engineer, you will work in the Pricing & Revenue context, focusing on data-driven improvements for forecasting, pricing logic, and product insights. You will develop analyses and models that demonstrate measurable impact in our product – with thorough evaluation, a solid data foundation, and pragmatic implementation. You will collaborate closely with Product & Engineering.

Your Responsibilities
Model Evolution: You will develop and optimize our forecasting and pricing models as well as data-driven decision logics, always with methodical pragmatism and a strong focus on impact.

Signal Hunting: You will work with time series, demand signals, and heterogeneous data sources. You define features and labels carefully to leave no chance for leakage.

Measurement & Guardrails: You are responsible for evaluation through backtesting, robust metrics, and segmentation. You support holdouts and A/B logics and maintain the balance between offline and online performance.

ML Engineering Best Practices: You raise standards for backtesting, reproducibility, and versioning. For us, it's: Engineering quality instead of notebook-only.

Data Visibility: You enhance dashboards and reports that make model and business KPIs transparent. Your focus is always on the highest data quality.

Smart Workflows: You drive reproducible workflows (versioning, clear pipelines, meaningful tests) and automate recurring analyses and evaluation runs.

Your Profile
Track Record: You have 4+ years of experience in data science or applied ML engineering – ideally directly in a product or business context.

Data Intuition: You possess extremely strong SQL skills and a deep sense for data quality, debugging, and consistent metrics.

Python Pro: Your Python code is clean and your analyses are transparent. Initial experience with product-oriented setups is a big plus.

Experiment Mindset: You master the basics of bias/leakage-awareness and know how to think in guardrails and offline-vs-online scenarios.

Work Style: You take full ownership of your topics. You work according to the 80/20 principle (pragmatic!), are reliable, and communicate clearly.

Entrepreneurial Spirit: You think entrepreneurially and want to truly make a difference.

Language Skills: You are fluent in German and have good English skills.

Nice-to-haves – What Sets the Best Apart
Domain Expertise: You already have experience in revenue management or dynamic pricing (e.g., hotel, travel, eCommerce, or mobility).

Demand Knowledge: You are familiar with seasonality, events, lead times, and segment patterns.

Modern Stack: You have already worked with analytics engineering or warehouse tools such as dbt, Snowflake, or Met

Hands-On MLOps & Cloud: Bonus if you have hands-on skills to work with MLOps tooling and cloud infrastructure, e.g. AWS

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Interview prep

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Mid
Technology & IT Data Analysis MySQL Python SQL Mid level full-time

Likely questions

  1. Tell us about work you have done that is close to the Senior Machine Learning Engineer (m/f/d) role.
  2. How would you approach your first 30 days at Happyhotel?
  3. Which of Data Analysis, MySQL and Python have you used recently, and what did it help you achieve?
  4. Describe a time you solved a problem without waiting to be told exactly what to do.
  5. How do you handle busy days, changing priorities, or pressure at work?

Prepare before the call

  • A recent example that proves your experience with Data Analysis, MySQL and Python.
  • One short story with a problem, your action, and the result.
  • Two examples that show the strengths listed on your CV.
  • A clear reason why this role and company interest you.
  • Your availability, preferred work style, and salary expectations.

Ask them

  • What would success look like in the first 90 days?
  • What are the main problems this hire should help solve?
  • How does the team give feedback and measure good work?
  • What does a normal working week look like for this role?
Practice line

I am interested in the Senior Machine Learning Engineer (m/f/d) role because I can bring practical experience in Data Analysis, MySQL and Python, learn the team quickly, and contribute to the outcomes Happyhotel needs from this hire.

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