About us Ruby Labs is a leading tech company that creates and operates innovative consumer products. We are looking for a disciplined, highly autonomous Middle Next.js Developer to build and ship product features for one of our core D2C subscription products. You will own features end to end across a TypeScript monorepo — a Next.js App Router client, a Fastify + Payload CMS API on PostgreSQL, and Cloudflare Workers at the edge — from the moment you receive a task, through breaking it down, estimating, implementing, testing, and observability, to a clean release to production and confirmation that it works for real users.

Half-tested code, silent failures, and unverified AI-generated output are not acceptable. You are accountable for every task you take on and for every area of the product you touch: if it breaks, regresses, or stays half-finished, that is yours to see through. We expect maximum autonomy and real involvement in the product — you work independently within a sprint, communicate risks before they become blockers, and escalate architectural decisions to senior engineers rather than guessing.

Build features across the Next.js client and the Fastify + Payload CMS backend according to product requirements

Integrate third-party providers — billing, email/CRM, analytics — over REST APIs and webhooks

Quality & Reliability

Cover functionality with unit, integration, and e2e tests at the level the team expects

Fix bugs and perform root-cause analysis for recurring issues

Optimize page and endpoint performance — rendering and caching strategy, database queries, bundle size

Apply secure development practices: schema validation, access control, safe handling of secrets

Own the areas of the product you work in: their stability, performance, and follow-up fixes

Surface requirement clarifications, estimate changes, and risks early and in writing

Escalate complex architectural decisions and critical risks to senior engineers

2+ years of commercial React experience, including 1+ year with Next.js (App Router, Server Components,



route handlers, rendering and caching strategies) and solid TypeScript

- Node.js backend experience on a typed framework (Fastify, Nest, or Express) with PostgreSQL — REST API design, schema migrations, integrations over REST and webhooks (signature verification, idempotency, retries) — plus a working understanding of auth mechanisms, and web security fundamentals
- TanStack Query, Zustand, React Hook Form + Zod, Tailwind CSS, and a React component library such as HeroUI, MUI, or shadcn/ui
- Experience with a code-first headless CMS on PostgreSQL (Payload, Strapi, Directus, or equivalent) — collections, access control, generated types, migrations
- Testing and delivery discipline: e2e tests (Cypress or Playwright) and unit/integration tests (Vitest or Jest), Git flow, code review, working with CI
- Daily use of AI development tools (Claude Code or equivalents), including configuring them for a project — context, instructions, rules, MCP/integrations — with full ownership of the quality, security, and correctness of generated code
- English — B1+

Owns the outcome — takes a task from requirement to production without waiting to be pushed, and stays accountable for the result and the area it touches

Verifies before trusting — treats AI output, third-party responses, and your own code as unproven until tested

Structured communicator — surfaces risks, blockers, and estimate changes early, in writing, in a remote team

Ruby Labs operates within the CET (Central European Time) zone. Remote Work Environment: Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.

Adaptable Independent Contractor Agreement: Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here:

Life at Ruby Labs

At Ruby Labs, we move fast, aim high, and expect the same from our team. If you’re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.

LI-Remote

📌 Senior Full stack developer Next.JS/Node.JS (España)
🏢 Ruby Labs
📍 España