> Markdown version of [/jobs/ext/3031720-founding-full-stack-engineer](https://www.wearedevelopers.com/jobs/ext/3031720-founding-full-stack-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Founding Full-Stack Engineer - **Company:** Whyhirewrong - **Location:** Amsterdam, Netherlands (Remote available) - **Experience:** Starter - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Code Review, Databases, Continuous Integration, Software Debugging, Middleware, Github, PostgreSQL, Node.Js, Svelte, Responsive Web Design, SQL Databases, TypeScript, Web Usability, Tailwind, ReactJS, Indexer, Backend, Vue.js, Front End Software Development, Api Design, NestJS, Crud - **Published:** September 23, 2026 - **Apply:** https://www.careerjet.nl/job/nl803a64d0db24b7ee1f2d48c9ca22d2ab/eaa ## About the Role 4+ years of professional frontend engineering, with at least 1-2 years using SvelteKit specifically. Deep, verifiable experience in another modern reactive framework (React, Vue) is acceptable only if paired with proof of fast ramp-up on Svelte. Strict TypeScript: comfortable with generics, discriminated unions, and typing complex API responses. Can explain, without hesitation, why any is a problem and how to avoid it. Working knowledge of Fastify specifically, or deep equivalent experience in another Node.js framework (Express, Hono, NestJS) with fast ramp-up expected on Fastify's plugin and hook system. Hands-on Postgres skills: schema design, indexing basics, writing and reverting migrations, and diagnosing slow queries with EXPLAIN. Comfortable in the psql CLI, not only through an ORM GUI. Tailwind CSS in production: custom theme configuration, component abstraction, and responsive design without excessive utility duplication. Public GitHub profile with commit history that verifiably backs the stack above, or a live, functioning product built end to end that can be tested directly. Able to walk through a real production incident or bug you fixed across both frontend and backend in the same session. Based in Europe, working remotely, with significant working-hours overlap with a founder-led team. Not a Fit If No public GitHub profile or live shipped product demonstrating this exact stack. Frontend-only background with no working knowledge of backend CRUD, API design, or SQL. Has only used an ORM and never written raw SQL, or cannot explain what a migration does. Loose TypeScript usage: any everywhere, no shared types between frontend and backend, no type safety across the API boundary. No experience with schema validation, error handling, or auth middleware on a real backend service. Exclusively enterprise background with narrow, siloed scope and no end-to-end product ownership. Good to Have Ex-founder or entrepreneurial background. Side projects shipped for paying clients, with real users and real uptime requirements. Direct production experience with SvelteKit, Tailwind, and Fastify together, not just individually. Experience setting up a project from zero: repo, CI, hosting, database, auth. ## Description Radical ownership of the product's UI/UX, working directly with the founder. High autonomy on approach and speed, paired with hands-on execution: shipping frontend features personally and building backend endpoints when the product needs it. No rigid process, no mandatory code review, blunt feedback culture. Responsibilities Build and ship SvelteKit applications end to end: routing, load functions, server-side rendering, form actions, and client-side state management. Write component-level TypeScript with strict typing; no any as a default, and no unchecked casts to bypass the compiler. Implement responsive, accessible UI with Tailwind CSS, including custom design systems and component variants, not utility classes copied from templates. Build and expose REST or RPC endpoints in Fastify, including request validation (schema-based), error handling, and auth middleware. Write and modify Postgres schemas: design tables, write and roll back migrations, and write raw SQL or use a query builder (Drizzle, Kysely, or Prisma) for non-trivial queries. Own performance on the frontend: bundle size, hydration cost, load waterfall, and Core Web Vitals. Set up or maintain CI/CD for a Node.js/SvelteKit app: build, lint, type-check, deploy. Debug production issues across the full stack without handing off to a backend specialist. ## Related Videos - [Nest.js - TypeScript in the backend can also be clean](https://www.wearedevelopers.com/videos/1033-nest-js-typescript-in-the-backend-can-also-be-clean) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) - [Innovating Developer Tools with AI: Insights from GitHub Next](https://www.wearedevelopers.com/videos/1268-innovating-developer-tools-with-ai-insights-from-github-next) - [Rest API Antipatterns](https://www.wearedevelopers.com/videos/100208-rest-api-antipatterns) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Next, Nest, Nuxt… Nust?](https://www.wearedevelopers.com/videos/421-next-nest-nuxt-nust) ## Related Articles - [The Best 7 Frontend Frameworks for Developers in 2025](https://www.wearedevelopers.com/magazine/400-the-best-7-frontend-frameworks-for-developers-in-2025) - [What’s the Difference Between Frontend and Backend Development?](https://www.wearedevelopers.com/magazine/240-what-s-the-difference-between-frontend-and-backend-development) - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [The 7 Most Popular Backend Frameworks for Developers](https://www.wearedevelopers.com/magazine/403-the-7-most-popular-backend-frameworks-for-developers) - [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025)