01Owns
HTTP APIs
Builds REST or GraphQL endpoints in Express, Fastify or NestJS with schema validation, consistent error shapes, pagination and an OpenAPI description.
Hire · Backend
Hire Node.js Developers
Senior Node.js developers who join your engineering team to own APIs, workers and service integrations, with no front-end responsibilities attached. Before they reach you, each has handled a paid task on event-loop blocking, streams, error propagation and background queues.
Backend only, focused on services
Senior and lead engineers only
Ships through your CI and on-call
On your team
What a Node.js developer owns on your team.
02Owns
Workers and queues
Runs background processing on BullMQ, SQS or similar, with retries, dead-letter handling and concurrency limits that protect downstream systems.
03Owns
Third-party integrations
Wraps payment, email and partner APIs with timeouts, circuit breaking and verified webhooks, so one slow provider cannot stall every request.
04Owns
Auth and access control
Implements sessions or tokens, OAuth flows and per-resource authorisation checks, and keeps secrets in configuration rather than code.
05Owns
Observability
Adds structured logs, request IDs, metrics and traces so incidents can be followed from a single failing request.
The questions that reveal real Node.js experience
Node’s single-threaded event loop is easy to describe and easy to forget in practice. Ask a candidate what happens to every other request while one handler parses a large JSON payload or hashes passwords synchronously. Developers who have run Node in production answer with an incident, not a definition.
Then ask how errors travel. A promise rejected without a handler, or an error swallowed in a catch block, is how Node services fail quietly. Look for someone who designs error types and logging deliberately.
Vetting
Skills we test before a Node.js developer joins.
01Tested
Event loop and performance
Recognises synchronous work that blocks the loop, moves CPU-heavy tasks to worker threads or a queue, and profiles with clinic or the built-in inspector.
02Tested
Async error handling
Avoids unhandled promise rejections, propagates errors with context, and shuts down cleanly on SIGTERM without dropping in-flight requests.
03Tested
Streams
Uses pipeline and backpressure correctly for large uploads, exports and proxying, rather than buffering whole files in memory.
04Tested
TypeScript on the server
Strict mode, runtime validation with Zod or similar at the edges, and shared types generated from the API schema.
05Tested
Databases from Node
Works with Prisma, Drizzle, Knex or raw drivers, manages connection pools and writes transactions that hold up under concurrency.
06Tested
Testing services
Integration tests against real databases in containers, contract tests for consumers, and fast unit tests with the node test runner or Vitest.
Work sample
How the Node.js developer work sample runs.
- 01Step 1
Unblock a frozen service
The candidate receives a service whose latency spikes whenever a report runs. They find the synchronous hot path and move it off the event loop.
- 02Step 2
Add a resilient endpoint
They build an endpoint that calls a flaky stub provider, with validation, timeouts, retries with jitter and integration tests. It is paid and kept to a few hours.
- 03Step 3
Stream a large export
Given code that loads a full table into memory to build a CSV, they rewrite it to stream with backpressure.
- 04Step 4
Brief an on-call engineer
A short call where they explain how they would trace a failing request through logs and metrics in the service they just changed.
Levels
Node.js Developers: what changes at each level.
01Level 1
Senior
Owns endpoints, workers and integrations inside your existing services, joins the on-call rota and reviews backend changes.
02Level 2
Lead
Sets API style, error contracts, service boundaries and observability standards across the Node.js estate.
03Level 3
Backend architect
Decides between a modular monolith and separate services, designs messaging between them and plans capacity and failure handling.
How seniority maps to your architecture
A single well-structured service needs a senior engineer to extend it. When different teams have built endpoints in different styles, a lead brings consistency in errors, auth and logging. Hire an architect when you are deciding whether to split a monolith or introduce a message broker, because those choices are expensive to reverse.
Other options
When to hire someone other than a Node.js developer.
01Consider
One person for UI, API and database
If you need someone who also builds the screens, a full-stack developer owns the whole path.
Open register02Consider
High-throughput or CPU-bound services
If raw concurrency and low memory use matter most, Go may suit the workload better.
Open register03Consider
Data pipelines and ML serving
If the backend is mostly data processing and models, Python developers bring the stronger ecosystem.
Open registerBackend-only is a deliberate choice
We keep this role focused on services because API design, queues and reliability are full-time work once traffic grows. If your team is small and the back end is a thin layer over a database, a full-stack hire may give you more. Once you have several services, background jobs and partner integrations, a specialist pays for themselves in fewer incidents.
Onboarding a backend engineer safely
Give read access to logs and dashboards on day one, even before write access to production. Understanding normal traffic shapes how they change the code. A good first ticket is an endpoint with a known performance complaint: it touches the database, the framework and observability in one go.
FAQ
Questions to resolve before the build.
01Do your Node.js developers build front ends too?
No. This role is scoped to backend services: APIs, workers, integrations and data access. If you want one person across the interface as well, look at our full-stack developers.
02Which framework do they use?
They work in whatever you run. Most have production experience with Express and at least one of Fastify or NestJS, and we match candidates to your framework during shortlisting.
03Can they take part in on-call?
Yes. Most clients add them to the rota after their first handful of releases, when your alerts and runbooks are familiar. Senior candidates have all supported production services and are tested on tracing a failure during vetting.
Works alongside
Roles a Node.js developer works best alongside.
01Pair with
React developers
For the interface that consumes the API, with schemas shared so both sides change together.
Open register02Pair with
DevOps engineers
To run containers, autoscaling, secrets and dashboards for the services the Node.js team builds.
Open register03Pair with
QA engineers
For API regression suites and load tests before high-traffic releases.
Open registerProduct delivery
Need the whole product built instead?
Primary sources
References behind this page
Dated official documentation, standards, and research that support the factual claims on this page.
- 01Node.js: Don’t Block the Event Loop
Official guide to keeping Node.js servers responsive.
- 02Node.js API: Stream
Reference for readable, writable and pipeline streams with backpressure.
How to read this page
Scope, cost and timeline figures are planning guidance until confirmed in a written proposal. Diagrams and screens are illustrations, not client deliverables, and source-code rights and handover follow the signed agreement. See the delivery process and the full disclaimer.
Next decision
Turn the brief into an accepted product scope.
Define outcomes, constraints, evidence, rights and handover before delivery begins.
Commercial rights, repositories, environments, documentation, acceptance and handover remain contract-defined.