CareerOS is a B2B2C career platform serving 100+ top MBA programs worldwide - including Oxford, INSEAD, London Business School, Georgetown, and Notre Dame - along with 30+ employers. We help 500K+ users land jobs they love. We're a small, high-output team based in Barcelona, operating with American startup intensity - we ship fast, own our decisions, and push each other to do great work.

We work in small squads, each owning their own area of the product end-to-end.

We're looking for a Junior Engineer who's strong on frontend and eager to grow into a full-stack developer. You'll ship real features from day one, learn fast, and work alongside senior engineers who'll help you level up.

What you'll actually do

You won't do busywork. You'll ship real features to real users.

• Build frontend features - React and TypeScript will be your main focus. You'll implement UIs, work with design, and ship features users interact with daily.
• Grow into full-stack - We expect willingness to work across the stack. You'll start touching Node.js APIs and databases as you get comfortable.
• Build with AI tools - We use AI coding tools daily (Claude Code, Cursor - team members pick what works for them). You should be comfortable (or excited) to work this way.
• Work directly with design - Implement responsive interfaces from Figma. Ask questions when specs are unclear.
• Learn in production - We do continuous deployment. You'll see your code live quickly, learn from mistakes fast, and improve with each feature.

What we're looking for

Must-haves:

• 1-2 years of experience (or strong projects/bootcamp background) building web applications
• Confident with React and TypeScript - You can build UIs, manage state, and work with components
• Code quality - Knowledge of SOLID principles and clean code practices
• User focus - You have a strong sensibility for UI and UX and understand what makes a web application feel responsive and polished
• Willing to learn full-stack - You're curious about how the backend works and want to grow in that direction
• Good communication - You ask questions when stuck, share progress, and work well with others