Middle Next.js Developer

Ruby Labs is a leading tech company that creates and operates innovative consumer products. The company offers opportunities across the health, education, and entertainment industries, focusing on consumer-led products.

Must-Have Experience:

• 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 such as Fastify, Nest, or Express with PostgreSQL; knowledge of REST API design, schema migrations, REST/webhook integrations, HTTP/REST, auth mechanisms, and web security fundamentals
• Experience with modern client stack: TanStack Query, Zustand, React Hook Form + Zod, Tailwind CSS, and a React component library like HeroUI, MUI, or shadcn/ui
• Experience with code-first headless CMS on PostgreSQL like Payload, Strapi, or Directus
• Testing and delivery discipline with e2e tests (Cypress or Playwright) and unit/integration tests (Vitest or Jest), Git flow, and code review
• Daily use of AI development tools (Claude Code or equivalents) with full ownership of quality, security, and correctness of generated code
• English proficiency at B1+ level

Leadership Attributes:

• Takes ownership from requirement to production and accountability for impact
• Maximally autonomous and involved, with goal-oriented work approach
• Verifies AI output, third-party responses, and own code before trusting
• Structured communication to surface risks, blockers, and estimate changes early
• Recognizes scope limits and escalates architectural and security decisions
• Learns from incidents by fixing root causes

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 such as billing, email/CRM, and analytics over REST APIs and webhooks

Quality & Reliability:

• Cover functionality with unit, integration, and e2e tests
• Run thorough self-review before code review and review teammates' code rigorously
• Fix bugs and perform root-cause analysis for recurring issues
• Optimize page and endpoint performance including rendering, caching strategy, database queries, and bundle size

Security & Observability:

• Apply secure development practices including schema validation, access control, and safe handling of secrets
• Follow observability practices including structured logging, metrics, and alerts

Collaboration:

• Break down, estimate, and ship own tasks to production within sprints and stay accountable after release
• Own the areas of the product worked on regarding stability and performance
• Surface requirement clarifications, estimate changes, and risks early and in writing
• Escalate complex architectural decisions and critical risks to senior engineers

Applicants must be located within approximately ± 4 hours of the Central European Time (CET) zone to ensure optimal collaboration and communication during working hours.