Mern Full Stack Developer

Role & responsibilities

Design and implement user-facing features in React + Next.js (App Router, SSR/SSG, routing, data-fetching). Build and maintain Node.js APIs (REST/GraphQL), middleware, and background jobs. Model, query, and tune data across non relational and relational databases (indexes, migrations, transactions). Write high-quality TypeScript with strong typing, generics, and runtime guards (e.g., zod). Ship maintainable UI: state management, accessibility, responsive design, component composition. Own CI/CD pipelines, testing (unit/integration/e2e), logging/monitoring, and on- call rotations. Collaborate with Product/Design; break down work into incremental releases; document decisions (ADR).

Preferred candidate profile

5+ years building production web apps with TypeScript. Strong React fundamentals (hooks, context, effects), and Next.js (server components, data fetching, caching, route handlers). Node.js proficiency (Express/Fastify/Nest, async patterns, streams, error handling). Data layer: NoSQL (MongoDB, Firestore): schema design in a schema less store, aggregation, indexes, TTL, transactions (if using replica sets). o SQL (PostgreSQL/MySQL): normalization/denormalization, joins, indexing, query plans, migrations. Testing: Jest/Vitest + React Testing Library; API integration tests; e2e (Playwright/Cypress). Proficient at Git, familiar with GitHub workflow, code reviews, feature flags, trunk- based or short-lived branches. Familiarity with security basics: OAuth/OIDC, CSRF/XSS prevention, input validation, secrets management. Build, manage, and improve CI/CD pipelines. Nice-to-haves Next.js edge/runtime experience; server actions; ISR. Performance: profiling (Lighthouse/React Profiler), API and DB tuning, caching (HTTP, Redis). ORMs (Prisma/TypeORM) and query builders (Knex), plus raw SQL where appropriate. Familiarity with Vector DBs for AI and LLM Workflows Message queues & background jobs (BullMQ, SQS); CRON/temporal workflows. Infrastructure Familiarity: Docker, Vercel/Netlify, AWS/GCP/Azure. Analytics/observability: OpenTelemetry, Datadog, Sentry, Prometheus/Grafana. Real-time features: WebSockets/SSE. DX: Storybook, design systems, shadcn/ui, Tailwind.