Middle Next.js Developer

Ruby Labs; United States; Remote; USD 90,000 - 150,000; Full time

Benefits offered by this job

Fully remote

Unlimited PTO

MacBook provided

Contractor agreement

Three-stage interview

Job summary

ruby-labs is seeking a mid-level frontend and full-stack engineer to own features end-to-end for a consumer subscription product. You’ll work in a typed TypeScript monorepo spanning Next.js App Router client, a Fastify/Payload API backed by PostgreSQL, and Cloudflare Workers.

You’ll ship features with feature flags, be responsible for testing, security, and performance, and contribute to monitoring and alerts in a highly autonomous, sprint-driven environment.

Qualifications

• Two or more years of commercial React experience.
• Experience with Next.js App Router and TypeScript.
• Node.js backend with Fastify, Nest, or Express and PostgreSQL.
• Familiar with TanStack Query, Zustand, React Hook Form with Zod, Tailwind CSS, and a component library.
• Experience with a code-first headless CMS like Payload, Strapi, or Directus.
• Testing discipline with Playwright or Cypress and Vitest or Jest.
• English at B1 or above.

Responsibilities

• Build features across the Next.js frontend and Fastify+Payload backend.
• Ship changes behind feature flags and A/B experiments with localization.
• Integrate third-party providers via REST APIs and webhooks.
• Implement unit, integration, and end-to-end tests and perform self-reviews.
• Diagnose bugs, optimize rendering, queries, and bundle size.
• Apply secure development practices and structured logging, metrics, and alerts.
• Break down, estimate, and deliver tasks within sprints with risk communication.

Skills

React

Next.js

TypeScript

Node.js

REST APIs

Testing

AI tools

Tools

Next.js

Fastify

Payload CMS

PostgreSQL

Cloudflare Workers

TanStack Query

Zustand

Tailwind CSS

Job description

Role overview

A mid-level frontend and full-stack engineering role focused on a consumer subscription product, working inside a typed TypeScript monorepo that spans a Next.js App Router client, a Fastify and Payload CMS API backed by PostgreSQL, and edge services on Cloudflare Workers. You will own features end-to-end—from breakdown and estimate through implementation, testing, and production release—while working within a strict Feature-Sliced Design codebase. The position suits a disciplined engineer who treats production stability as the standard and is comfortable with high autonomy inside a sprint.

Responsibilities

• Build product features across the Next.js frontend and the Fastify plus Payload CMS backend, respecting layered Feature-Sliced Design conventions.
• Ship changes behind feature flags and A/B experiments, fully localized across every supported locale.
• Integrate third-party providers for billing, email or CRM, and analytics through REST APIs and webhooks.
• Cover functionality with unit, integration, and end-to-end tests, and conduct thorough self-reviews before requesting peer review.
• Diagnose and root-cause bugs, optimize rendering and caching strategies, database queries, and bundle size.
• Apply secure development practices—schema validation, access control, careful secret handling—and contribute structured logging, metrics, and alerts.
• Break down, estimate, and deliver tasks within sprints, communicate risks early, and elevate architectural or security questions to senior engineers.

Requirements

• Two or more years of commercial React experience, including at least one year with Next.js (App Router, Server Components, route handlers, rendering and caching) and confident TypeScript.
• Node.js backend experience on a typed HTTP framework such as Fastify, Nest, or Express, with PostgreSQL, REST API design, schema migrations, and webhook integrations including signature verification, idempotency, and retries.
• Hands-on familiarity with TanStack Query, Zustand, React Hook Form with Zod, Tailwind CSS, and a component library like HeroUI, MUI, or shadcn/ui.
• Experience with a code-first headless CMS on PostgreSQL such as Payload, Strapi, or Directus, including collections, access control, and generated types.
• Testing discipline using Playwright or Cypress for end-to-end coverage and Vitest or Jest for unit and integration tests, plus Git flow, code review, and CI workflows.
• Daily use of AI development tools such as Claude Code or equivalents, including configuring context, instructions, and integrations, with ownership over the quality and security of generated output.
• English at B1 or above.

Nice to have

• Background in subscription or D2C product development.
• Experience operating against edge runtimes like Cloudflare Workers.
• Familiarity with performance budgets and observability platforms.

Benefits and work setup

• Fully remote position open to candidates within roughly plus or minus four hours of CET.
• Unlimited paid time off plus paid national holidays.
• Company-provided MacBook.
• Independent contractor agreement with flexibility on location and schedule.
• Three-stage interview process: recruiter screen, technical interview, and final interview.