Sr. Full-Stack Developer

This role is perfect for a Senior Full-Stack JavaScript Developer with 5+ years of experience in Next.js, React.js, Node.js, and Express.js. Candidates should be skilled in relational/non-relational databases (PostgreSQL, MongoDB), UI libraries (TailwindCSS, ShadCN), and possess leadership abilities to mentor teams. Familiarity with CI/CD, Docker, and AI coding tools like GitHub Copilot is a plus.

1. When would you choose SSR, SSG, ISR, or CSR in Next.js?
   SSR for per-request personalized data, SSG for static content that rarely changes, ISR for mostly-static pages that need periodic revalidation, and CSR for highly interactive pages where SEO is less critical.

2. How do you structure a scalable Node.js/Express API for maintainability?
   Use layered architecture (routing → controllers → services → repositories), centralize validation and error handling middleware, and enforce request/response schemas (e.g., Zod/TypeBox) with strict TypeScript types.

3. What strategies improve React performance in large apps?
   Memoize components (React.memo, useMemo, useCallback), split bundles with dynamic import(), virtualize long lists, and avoid unnecessary re-renders by normalizing state and leveraging React Query/SWR for caching.

4. How do you secure a full-stack JS app end-to-end?
   Enforce HTTPS, use JWT or session cookies with CSRF protection, validate all inputs, apply rate limiting and helmet in Express, implement RBAC/ABAC on the server, and manage secrets via env managers (not in repo).

5. Relational vs NoSQL: when PostgreSQL/MySQL over MongoDB (and vice versa)?
   Choose relational for strong consistency, complex joins, and transactions; prefer MongoDB for flexible schemas and high write throughput on document data—always index access patterns and design for atomicity boundaries.

6. How do you model DB schemas and avoid performance pitfalls?
   Normalize core entities, add composite indexes matching query filters/sorts, keep transactions short, use connection pooling, and eliminate N+1 with JOINs or batched loaders.

7. What’s your approach to styling with TailwindCSS and shadcn/ui?
   Define a design token theme (colors, spacing, radius) in Tailwind config, use shadcn/ui for accessible Radix-based primitives, and extend via class-variance-authority to keep variants and state styles consistent.

8. How do you implement caching across the stack?
   Use HTTP caching (Cache-Control, ETag) and CDN for static/SSG, SWR/React Query for client data caching, and Redis for server-side memoization/ratelimiting—ensure cache keys include tenant/user and add TTL + stampede protection.

9. What testing strategy would you apply for a Next.js/Node.js app?
   Unit test logic with Jest/TS, integration test API routes with Supertest and a real/test DB (e.g., Testcontainers), and E2E with Playwright/Cypress; run in CI with seeded data and reproducible fixtures.

10. How do you lead a small JS team on a greenfield project?
    Set coding standards and TypeScript strictness, define trunk-based flow with short-lived PRs and mandatory reviews, write ADRs for key decisions, pair/mentor regularly, and automate CI/CD (lint, tests, build, deploy) for fast, safe iterations.

A remote tech company is hiring a Sr. Full-Stack Developer with leadership potential to build and guide high-performance web applications. You'll work with Next.js, React, Node.js, Express, and databases like PostgreSQL and MongoDB, while mentoring junior devs and driving clean, scalable code. The role offers full-time flexibility, modern tooling (TailwindCSS, ShadCN, AI dev tools), and impact on both product and team growth. Ideal for a proactive engineer passionate about full-stack innovation and team leadership.