Lead Data Scientist (Ads)

Location: Amsterdam, Netherlands. Hybrid work with 2 recommended office days per week; remote work is available under the stated EU and global workation policy.

Annual gross salary: €86,600–€127,400, excluding 8% holiday pay.

Company

hirify.global is a second-hand marketplace connecting millions of members across more than 20 markets, with additional shipping and payment businesses across Europe.

What you will do

• Own the data science approach for Ads optimization, including ranking, targeting, pacing, budget allocation, candidate selection, and auction or bidding logic.
• Design, develop, and iterate prediction, scoring, calibration, exploration-exploitation, and constrained optimization models.
• Lead experimentation, evaluation frameworks, metrics, guardrails, and performance improvement initiatives.
• Define objectives balancing advertiser value, revenue, user experience, and operational constraints.
• Diagnose delivery, relevance, auction, supply-demand, and model performance issues, and propose solutions.
• Partner with Product, Decision Science, Analytics Engineering, Data Engineering, backend, and development teams to move optimization logic into production.

Requirements

• Strong applied machine learning and statistical skills.
• Experience with Ad Tech systems and optimization problems, such as ads ranking, auction systems, pacing and budget optimization, marketplace or recommendation systems, relevance modeling, or other real-time optimization environments with multiple objectives.
• Strong product and business judgment, with the ability to work on production systems with engineers in ambiguous and evolving domains.
• Well-versed in Python and SQL.
• Structured and meticulous approach to testing different methods toward a defined goal.
• Ability to collaborate proactively and understand how work affects other team members.
• Ability to explain machine-learning methods to non-technical audiences.
• Solid written and spoken English.

Nice to have

• Experience with BigQuery.

Culture & Benefits

• Hybrid work model with flexibility to work from home and recommended office attendance two days per week.
• Workation policy allowing up to 90 days per year in the EU, including up to 21 global days; non-EU citizens can work worldwide for up to 21 days.
• 25 days of paid annual leave, pension plan, lunch benefit, flexible benefits budget, and work-from-home allowance.
• Share options, learning budget starting at €3,000 per year, and up to 10 development days over two years.
• Home-office equipment support, including up to €540 for furniture, plus a MacBook, mental-health support, bike leasing, and public-transport support.
• Frequent team-building events and a dog-friendly office.