Staff Machine Learning Engineer (AI)

TL;DR

Staff Machine Learning Engineer (AI): Designing, developing, and scaling impactful, production-grade ML solutions that power hirify.global’s products and growth with an accent on user reward schemes, personalized real-time reward values, and identifying underperforming campaigns. Focus on leading end-to-end delivery, applying advanced statistical and causal inference methods, and partnering with product and engineering teams.

Location: On-site 5 days a week in Berlin, Germany

Compensation: €105,000–€130,000 (yearly), offers equity and bonus

Company

hirify.global is Europe’s #3 fastest-growing company, building the future of marketing by rewarding its community of over 60 million users for engaging with advertisers’ products.

What you will do

• Own the design, development, and scaling of impactful, production-grade ML solutions.
• 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.
• 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

• Equity participation in hirify.global for all Berlin-based full-time employees.
• Opportunity for accelerated career growth within a profitable startup.
• Work from a modern, fully-stocked central Berlin office built for collaboration.
• Benefits include transport subsidy, breakfasts and lunches, language learning, and Urban Sports Club.