Senior/Staff ML Scientist – Bidding & Optimization (f/m/d)

Location: Applications welcome worldwide; relocation support is provided to Hamburg, Germany.

Company

hirify.global builds mobile advertising technologies for user acquisition, rewarded engagement, programmatic in-app advertising, and monetization.

What you will do

• Build foundational algorithms for real-time bidding, budget pacing, auction mechanics, and allocation.
• Translate academic research into robust production code optimized for sub-millisecond latency.
• Develop reinforcement learning, objective-based optimization, and control-theory systems for bidding, pricing, and budget pacing.
• Architect scalable Bayesian inference systems and data pipelines for sparse, high-dimensional advertising data.
• Deploy algorithmic frameworks serving millions of requests and evaluating tens of thousands of requests per second.
• Lead architectural discussions, collaborate with Product Managers and Engineers, mentor junior scientists, and guide research direction.

Requirements

• PhD in Computer Science, Statistics, Mathematics, or Physics, or an MSc with extensive industry research experience.
• At least 4 years of experience optimizing complex systems through automated algorithms in AdTech, marketplaces, or high-frequency trading.
• Peer-reviewed publications or equivalent research depth in computational advertising, auction theory, mechanism design, or game theory.
• Deep practical and theoretical expertise in reinforcement learning, objective-based optimization, control theory, bidding, pricing strategy, or budget pacing.
• Strong proficiency in Python and experience handling large-scale, sparse, high-dimensional data.
• Ability to design production systems for high-throughput, low-latency environments.

Culture & Benefits

• Work on infrastructure affecting 770 million users and billions of decisions every day.
• Operate within a diverse, global team representing more than 40 countries.
• Collaborate directly across research, product, and engineering functions.
• Relocation support to Hamburg, Germany is available.
• Work on high-impact adtech systems with frequent production delivery and rapid feedback cycles.