Sklum Digital & AI is an agentic-native team: a small, high-leverage group that heavily uses agentic AI workflows to build applications and scale our impact far beyond traditional team sizes. For this role in particular, agentic fluency is essential - you will be expected to use agentic tooling every day to multiply your own output, and to help shape how the team leverages these tools.

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We are looking for a Principal Fullstack Engineer to be a major hands-on builder of the new Sklum app, which we are building from scratch. This is a mobile-first fullstack role: the primary focus is React Native for mobile, extended with the backend work needed to deliver features end-to-end.
This is a primarily hands-on individual contributor role - you will spend most of your time writing and shipping production code.



You will report to the Principal Engineer - Architect and work closely alongside the Principal Software Engineer - Backend & Data and other senior engineers to deliver the app from zero to one.
The team operates across multiple cultures, locations, and time zones, and works asynchronously by default. We are looking for an engineer who thrives in distributed environments and builds strong working relationships across geographies.
What you'll be doingMobile-First Fullstack Engineering
- Design, build, and ship features end-to-end across the Sklum app - from the React Native mobile experience to the backend services that power it.
- Own the mobile experience layer: architecture, navigation, state management, performance, offline behavior, and production-grade patterns in React Native.
- Extend into the backend when needed: build APIs, services, and data flows that support the mobile experience, in close collaboration with the Backend & Data engineer.
- Contribute to the web experience (React / Next.js) where features span platforms, ensuring con

📌 Principal Fullstack Engineer (Valencia)
🏢 SKLUM
📍 Valencia