Junior Java Engineer

Unicorn Foundations: At Cosmose AI, we’re building smart, innovative technology that’s redefining digital marketing and content distribution. Since launching in 2014, we’ve gone from transforming offline shopping to powering personalized content experiences through AI. Founded by Miron Mironiuk, our journey began with one bold idea - and it has grown into a feature that caters to what people care about most, right from their lock screens.

Exceptional Engineering: Our engineering team is far from average; it's a powerhouse of talent. Comprising former FAANG employees and programming champions, they bring deep expertise and a shared commitment to building world-class products. Our strength lies in engineering solutions that leverage the power of AI, Data, and distributed computing. We thrive in a fast-paced startup environment, where agility, creativity, and quality drive everything we do.

Global Presence, Local Innovation: Cosmose AI is a global company with a presence in 8 countries, transforming content engagement through cutting-edge technology. Our flagship product, KAIKAI Lock Screen, delivers AI-powered, personalized content to users worldwide, unlocking new and exciting opportunities for product placement.

We are looking for an excellent Junior Java Engineer to provide the foundational technology for our business by building our backend services, while accounting for the challenges of scaling to millions of weekly users.

TL;DR Why us:

Big Scale & Startup Culture: Join a company that combines the scale of a major player with the agility and innovation of a startup

Exceptional Team: Collaborate with a team of former employees from tech giants like Google, Meta, ByteDance, and Microsoft, as well as ACM ICPC programming champions

Stock Options: As we grow and succeed together, you'll have the chance to benefit from it

Flat Structure: Enjoy a flat organizational structure that promotes collaboration and provides opportunities to learn from seasoned technical leadership

What you’ll do:

Develop software responsible for data processing and delivery

Implement well-structured automated tests

Communicate with the business and product teams

Work on integrations with external partners

Use modern technologies like Java 21 running on Spring Boot 3.2, Kafka, Redis, Clickhouse, PostgreSQL, Maven

What you’ll need:

Proven relevant education related to Software Development

Willingness to learn & work with our current Java & Spring ecosystem

Basic knowledge of SQL

Ability and confidence to communicate within the team (Polish and English are required)

Passion for software development and good engineering practices

First professional experience, e.g., internship, is a plus

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. We are unveiling untapped opportunities and profits in the industry - and we’re just getting started. At the core of our constant innovation is a rockstar engineering team, including four world championship programming medalists, working alongside driven, curious minds across all departments. You’ll work with a seasoned leadership team, backed with expertise across strategic domains - all within a culture that values learning, impact, and cross-functional collaboration. Cosmose is where a strong culture and shared goals unite individuals and teams to achieve bold 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 and working with a team that’s pushing boundaries, we’d love to meet you.