Hire a Verified Full Stack Developer Who Has Already Shipped Your Solution

End-to-end feature ownership over fragmented staffing

Staffing a web application with separate frontend, backend, and DevOps contractors creates coordination delays, interface misunderstandings, and finger-pointing when bugs occur. A senior full stack engineer takes a feature from relational schema design through backend API endpoints to the responsive frontend interface.

ProofDevs connects you directly with independent full stack engineers who operate as self-sufficient product builders, eliminating project management bloat and agency markups.

Architectural mastery across the modern web stack

Modern full stack development requires deep discipline in client-server boundaries. With frameworks like Next.js App Router and Remix, developers must understand server-side data fetching, streaming hydration, and edge computing.

Senior full stack engineers design relational schemas with strict constraints, write type-safe API boundaries using tools like Zod or tRPC, and build accessible, responsive user interfaces. They avoid bloated client-side bundles by keeping heavy operations on the server.

Furthermore, full stack specialists handle secure authentication flows, OAuth providers, payment webhooks, and background queue workers without requiring additional infrastructure specialists.

Technical toolchains and quality safeguards

Our full stack developers write type-safe TypeScript across both frontend and backend layers, ensuring schema changes immediately reflect in client UI types and compile-time checks.

• Type-safe data layers with TypeScript, Drizzle ORM, Prisma, or SQL queries.
• Modern frontend UI with Next.js, React, Tailwind CSS, and shadcn/ui component patterns.
• Relational database design in PostgreSQL or MySQL with proper indexing and foreign keys.
• Automated integration testing with Vitest, Playwright, and GitHub Actions CI/CD.

Standard full stack scopes and delivery timelines

Full stack engagements range from rapid MVP feature additions to comprehensive platform builds.

• End-to-end product feature (database migration, API, and responsive UI): 15 to 35 engineering hours.
• Third-party payment, webhook, and subscription billing integration: 12 to 25 engineering hours.
• Internal dashboard build with role-based access control (RBAC): 25 to 60 engineering hours.
• Application performance audit and Core Web Vitals remediation: 8 to 20 engineering hours.

Rate structures and full intellectual property ownership

Independent full stack engineers charge between $50 and $100 per hour based on specific stack depth (e.g. Next.js, Node.js, Python, PostgreSQL). You retain 100% ownership of all Git commits, database migration files, API documentation, and deployment infrastructure keys upon milestone approval.

Full stack approach comparison: Next.js vs split client and API vs hosted backend

Ship Next.js 14 App Router with TypeScript, Drizzle ORM, and Postgres when one codebase must cover landing pages, dashboards, and API routes. Server components keep bundles near 80 to 150 KB while server actions handle forms without a separate API deploy. A typed feature with migrations, tRPC or Zod-validated routes, and Playwright checks lands in 15 to 35 hours and suits teams of one to three engineers.

Split React 18 Vite clients from Node 20 Fastify or NestJS APIs when mobile apps or partner integrations share the backend. The contract stays typed through OpenAPI codegen or tRPC proxies, with Redis queues isolating webhooks and billing jobs. Expect 25 to 60 hours for auth, RBAC, and Stripe webhooks plus 8 to 15 hours for CI with Vitest and GitHub Actions, at the cost of two deploys to watch.

Start on Supabase or Firebase plus Next.js when auth, storage buckets, and row-level security must ship in 15 to 30 hours without DevOps hires. Add BullMQ workers and Postgres LISTEN channels when cron and email jobs outgrow edge functions. If traffic passes 10,000 requests per minute with heavy writes, move hot paths to a dedicated Node API with PgBouncer pooling in a 20 to 40 hour extraction.

Legacy app upgrades without freezing feature work

Legacy estates combine jQuery frontends, PHP or Rails monoliths, and Postgres or MySQL schemas without migrations. Engineers open with a 6 to 12 hour audit: bundle sizes via Lighthouse, duplicate API logic, N+1 traces, and flaky Selenium suites. The strangler pattern carves one route or widget at a time behind an Nginx proxy, keeping the old app as fallback until Playwright green-lights each slice.

Phase one installs guardrails: TypeScript strict mode, ESLint and Prettier, Vitest plus Playwright smoke tests, and Drizzle or Prisma migrations with seed scripts in GitHub Actions. Phase two extracts auth, billing, and dashboard routes into Next.js in 30 to 70 hour bands, each behind feature flags with instant rollback. API payloads stay versioned so iOS, Android, and web clients keep working during the cutover.

Data and asset moves run beside UI slices: S3 bucket versioning, CloudFront cache rules, and batched backfills at 10,000 rows per job with BullMQ retries. Typical bands are 20 to 45 hours for test and CI repair, 30 to 70 hours for route extraction with regression suites, and 15 to 35 hours for auth and payment cutover with webhook replays. Every release notes a one-click revert and keeps old sessions valid.

• Estate audit with Lighthouse, trace, and test inventory: 6 to 12 hours.
• Test and CI repair with Vitest, Playwright, migrations: 20 to 45 hours.
• Route extraction into Next.js with flags and rollback: 30 to 70 hours.
• Auth and payment cutover with webhook replays: 15 to 35 hours.

Taking over an existing web app: pre-hire audit

Let the engineer read the estate before estimating features. Provide monorepo or separate frontend and backend repos, .env.example files, migration history, Postman collections, Sentry traces, and a seeded staging database with row counts. A senior returns a 5 to 9 hour report: duplicated auth logic, untyped API drift, missing DB indexes, oversized bundles above 400 KB, and webhook handlers without idempotency keys.

Split patchable debt from structural failure. Patchable means ESLint gaps, absent Playwright flows, slow pages tied to two missing indexes, fixable in 15 to 40 hours. Rebuild signals are copied auth checks in twenty files, payments without ledger tests, or session handling that breaks on every deploy. Seniors attach hour bands to each path and flag where continued patching keeps outage exposure.

Hiring checklist and a 4-hour paid trial task

Interview for vertical delivery, not framework trivia. Seniors trace a feature from Drizzle migration through tRPC route to React cache invalidation, citing pool sizes and Core Web Vitals numbers they moved. Juniors list hooks and routes but stall on RLS policies, webhook retries, or bundle splits. Ask for a shipped PR with migration, API, and UI diffs plus a postmortem on a broken deploy they rolled back.

Assign a paid 3 to 5 hour slice on your repo: add a filtered admin table with migration, API, and tests. Acceptance is migration applies and rolls back cleanly, API validates with Zod, p95 under 300 ms on 50,000 seeded rows, Lighthouse performance above 85, and Playwright flow green. Pay $50 to $100 per hour and hire when the diff merges without cleanup commits.

• Senior signal: traces migration to API to cache with pool and Vitals numbers.
• Junior signal: recites hooks but stalls on RLS, retries, or bundle splits.
• Trial acceptance: rollback clean, Zod valid, p95 under 300 ms, Playwright green.
• Kickoff gate: repos, .env.example, Postman set, staging seed before hour one.