Machine Learning Engineer (Adtech)

TL;DR

Machine Learning Engineer (Adtech): Designing, developing, and scaling impactful, production-grade ML solutions that power hirify.global’s products and growth with an accent on optimizing user reward schemes based on player behavior and market shifts. Focus on leading the design and implementation of solutions for personalized, real-time reward values and developing solutions for identifying underperforming reward campaigns and causes of failure.

Location: Hybrid, London, UK

Salary: £120K – £220K

Company

hirify.global is building the future of marketing by rewarding our community of over 60 million users for engaging with our advertisers’ products.

What you will do

• Lead end-to-end delivery: build, deploy, and optimise solutions and services at scale.
• Provide technical leadership across ML projects, ensuring best practices and high-quality code.
• Align technical capabilities with business priorities to unlock high-value opportunities.
• Apply advanced statistical and causal inference methods to ensure robustness and reliability.
• Partner with product and engineering teams to translate business challenges into predictive, data-driven solutions.

Requirements

• Proven expertise in building, deploying, and maintaining solutions and services in production, ideally in adtech or high-scale environments.
• Deep knowledge of statistics (A/B testing, regression, probability).
• Strong programming background in Python and SQL, with hands-on cloud experience.
• Ability to mentor and set technical direction for ML engineers and cross-functional peers.
• Strong communication skills to influence both technical and non-technical stakeholders.

Nice to have

• Passion for gaming and strong understanding of player behaviour.
• Experience with adtech, monetisation platforms, or the gambling industry.
• Familiarity with gaming KPIs such as pLTV, retention, and ROAS.

Culture & Benefits

• All Berlin-based employees receive equity in hirify.global.
• Opportunity to scale with a profitable startup.
• Central Berlin office with modern amenities.
• Transport subsidy, breakfasts and lunches, language learning, and Urban Sports Club membership.