Full Stack Engineer
Full-stack engineer at CareerOS, a Barcelona-based career platform for MBA programs and employers, building features end-to-end with React/TypeScript and Node.js (some legacy Go). Ships continuously, implements designs from Figma, makes product decisions, and uses AI coding tools daily.
- Compensation
- Not disclosed
- Location
- Not listed
- Work setup
- Hybrid
- Seniority
- Senior
- Employment
- Not specified
- Experience
- 3+ years
- Category
- Fullstack
- Posted
Skills
Must have
- 3-5 years building production web applications, comfortable on both frontend and backend
- Strong React and TypeScript skills
- Backend experience with Node.js (APIs, databases, debugging across the stack)
- Solid SQL skills
- Strong product intuition; has made design and technical calls
- Excellent communication, comfortable working async
- Comfortable with ambiguity
- Fluent English
Nice to have
- Prior experience at an early-stage startup
- Side projects or open source contributions
- Experience using AI coding tools
- Care about craft: clean code, good abstractions, thoughtful UI details
Full description
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 an Engineer who can work confidently across the full stack - React/TypeScript on the frontend, Node.js on the backend. You'll ship features end-to-end, make product decisions, and grow into a senior role with us.
What you'll actually do
You won't specialize in one corner. You'll build across the stack.
- Ship features end-to-end - From database to UI. You'll work across React/TypeScript and Node.js (with some legacy Go), owning features from start to finish.
- Make product decisions - See a confusing UX? Fix it. Have a better idea for an API design? Propose it and build it. We trust engineers to make smart calls on small-to-medium product decisions.
- 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 pixel-perfect, responsive interfaces from Figma. Push back when something doesn't make sense.
- Own your code in production - We do continuous deployment. What you merge today is live today. You'll debug, monitor, and improve what you build.
What we're looking for
Must-haves:
- 3-5 years building production web applications, comfortable on both frontend and backend
- Strong React and TypeScript skills - You can build complex UIs confidently
- Backend experience with Node.js - You can write APIs, work with databases, and debug across the stack
- Solid SQL skills - You can write queries, understand schemas, and think about data
- Strong product intuition - You've shipped features where you made design and technical calls, not just followed tickets
- Excellent communication - You can articulate tradeoffs clearly, push back respectfully, and work well async
- Comfortable with ambiguity - Requirements will be fuzzy. You ask the right questions, make reasonable assumptions, and move forward without hand-holding