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 strong Mid OR Senior Java Engineer to help shape and scale the backend of our core product, KaiKai Lock Screen, used by millions of users every day. You’ll build and improve the services behind both the Lock Screen and our internal CMS, working on systems that process and deliver content at scale and have a real impact on the end-user experience.
What you’ll do:
- Design, develop, and maintain backend services for KaiKai Lock Screen and CMS
- Build scalable systems for large-scale data processing and real-time content delivery
- Contribute to architecture and system design improvements
- Maintain high code quality through testing, code reviews, and engineering best practices
- Work with distributed and event-driven systems to build scalable backend solutions
- Improve system performance, reliability, and efficiency for a high-traffic product
- Support integrations with external services and third-party systems
- Collaborate closely with Product, Content, and Data teams to deliver meaningful features
- Share knowledge and contribute to continuous team improvement
What you’ll need:
- Strong experience in Java backend development
- Experience building scalable and high-performance backend systems
- Familiarity with event-driven systems (Kafka) and modern architectures
- Knowledge of relational databases and SQL
- Ability to take ownership and drive solutions
- Good communication within the team (Polish and English required)
- Experience with high-traffic systems is a plus
We’re building something big - and we’re just getting started.
If you’re excited about shaping the future of AI-powered mobile content and working with a team that’s pushing boundaries, we’d love to meet you.
👉 Be part of the Cosmose story. Apply now!
Read more on:
TechCrunch, Business Insider