Tech Leader - Recommendation Systems / Personalization

About Cosmose AI

We make smartphones smarter. Cosmose is integrated by eight phone makers, capturing first-screen real estate and first-party data to drive over 2 billion daily user interactions in 60+ countries.

Why Join Cosmose AI?

• Global Scale: Build a product natively integrated across eight major OEMs with access to first party data from millions of phones in over 60 countries.
• Elite Talent Density: Work alongside IOI and ACM-ICPC champions.
• High Autonomy, Fast Velocity: Take complete ownership with rapid deployment cycles and a flat org chart.
• Real Ownership: Earn stock options that directly tie your upside to our global growth and success.

We’re looking for a Tech Leader to guide an established team focused on building and evolving large-scale recommendation systems that power content discovery for millions of users. In this role, you’ll drive the technical direction of our recommendations platform, leveraging machine learning where it adds the most impact while ensuring ideas translate into robust, production-ready systems. You’ll partner closely with engineers, data scientists, and product teams to continuously improve relevance, personalization, and user experience.

What You’ll Do

• Lead the recommendations team - define the mission, guide the roadmap, and support day-to-day execution.
• Work with the team to design, prototype, and deploy ML models that drive content personalization.
• Collaborate with product, engineering, and data teams to identify impactful research directions that solve real user problems.
• Turn research into production-ready solutions, balancing innovation with performance, reliability, and scalability.
• Mentor and grow engineers, fostering a learning culture within the team.
• Contribute to hiring and shaping the team, bringing in top talent, and helping them succeed.
• Stay up-to-date with the latest in ML research and tech, and bring those insights to our systems and strategies.

What You’ll Need

• Experience in building high-scale distributed systems with ML components (e.g., Search, Ranking, Personalization, or AdTech)
• Solid foundation in computer science and applied mathematics, including statistics, optimization, and algorithms.
• A track record of bridging research and production - from academic ideas to real-world systems.
• Proficiency in Python, and working knowledge of ML libraries
• Experience in leading engineering and research teams
• Experience in a fast-paced, startup environment, balancing speed, pragmatism, and quality
• Clear and effective communication within the team (Polish and English are required)

What You’ll Enjoy

Cosmose provides employees with a great platform to immerse and learn about the most exciting, innovative, and disruptive technologies in offline behavior solutions, unveiling untapped opportunities and profits in the industry. The company constantly innovates to invent and apply world-class technologies with a rockstar engineering team, including four world championship programming medalists. You’ll be working with a strong leadership team backed by experience from various key strategic areas and many other driven & intelligent people across the company. Cosmose is a place where great culture and goals unite departments and individuals to achieve big milestones together.

We’re building something big—and we’re just getting started.

If you’re excited about shaping the future of AI-powered mobile content, we’d love to meet you.

👉 Be part of the Cosmose story. Apply now!

Read More On

TechCrunch, Business Insider