Middle Full-Stack Developer (Next.js)
- Compensation
- Not disclosed
- Location
- Ukraine
- Work setup
- Remote
- Seniority
- Middle
- Employment
- Contract
- Experience
- 1+ years
- Category
- Fullstack
- Posted
Skills
Must have
- 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 HTTP framework (Fastify, Nest, or Express) with PostgreSQL — REST API design, schema migrations, integrations over REST and webhooks (signature verification, idem
- Hands-on with the modern client stack: 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
- English — B1+
Full description
About us
Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at:
About the role
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.
This is a hands-on engineering role suited for someone who treats production as the standard, not the finish line. Half-tested code, silent failures, and unverified AI-generated output are not acceptable. The codebase is convention-heavy — a layered Feature-Sliced Design structure with strict import rules — and you are expected to work inside those conventions rather than around them. 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.
Key Responsibilities
Feature Development
- Build features across the Next.js client and the Fastify + Payload CMS backend according to product requirements
- Write code that follows the team's Feature-Sliced Design layering, naming, and import conventions
- Ship changes behind feature flags and A/B experiments, fully localized across every supported locale
- 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
- Run a thorough self-review before code review, and review teammates' code with the same rigour
- Fix bugs and perform root-cause analysis for recurring issues
- Optimize page and endpoint performance — rendering and caching strategy, database queries, bundle size
Security & Observability
- Apply secure development practices: schema validation, access control, safe handling of secrets