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Backend Engineering
Node.js APIsMicroservicesRealtime & Queues

Node.js Backend Development Services

Express, Fastify & NestJS APIs Built Right

<50ms
API Response Time
P95 target
99.9%
Uptime SLA
Production systems
100%
Type-Safe
TypeScript throughout
0
Unhandled Errors
Observability-first
What Is Node.js Backend Development?

Node.js backend development is about building the server-side layer that everything else depends on — APIs, microservices, event-driven systems. Frameworks like Express, Fastify, and NestJS handle the core work: managing concurrent connections, routing requests, structuring your application logic. Add PostgreSQL for persistence, Redis for speed, and a proper queue system, and you've got the foundation that SaaS platforms and distributed systems actually run on.

Waar projecten falen

Your REST API holds up fine in development, then falls apart the moment real traffic hits Users aren't waiting around for dashboards that take 3+ seconds to load. Every 100ms of added latency is quietly costing you conversions.
Payment webhooks fail Data pipelines drop records. There's no retry logic, no error handling worth the name — just silent failures that show up later as lost transactions and corrupted state.
You've got a monolith nobody wants to deploy Feature development slows to a crawl. Every release feels like you're defusing something.
Background jobs running on cron scripts or setTimeout calls vanish on restart, can't be retried, and give you no visibility into what failed or why You find out something went wrong when a customer complains.
Your monitoring is console.log Customers report outages before your own tools do. Mean time to recovery stretches into hours because you're flying blind.
Unindexed queries, full table scans on every request, and a database bill that went from $200 to $2,000 before you noticed PostgreSQL can do a lot — but not without a little help.

Compliance

Framework Selection

We pick Express, Fastify, or NestJS based on what the project actually needs. Fastify for raw throughput. NestJS for teams that need consistent structure across a large codebase. Express when ecosystem compatibility matters more than anything else.

Database Architecture

PostgreSQL schema design with Prisma ORM, proper indexing, and migration workflows you can actually trust. Supabase integration for auth, storage, and realtime subscriptions when it fits.

Redis & Caching Layer

Redis for session management, response caching, rate limiting, and pub/sub. Cache invalidation strategies that hold up under real production conditions — not just in theory.

Queue Processing

BullMQ job queues with retry logic, dead letter queues, priority scheduling, concurrency limits, and a monitoring dashboard. Background jobs that survive restarts and can be inspected when something goes wrong.

Webhook Architecture

Inbound and outbound webhook systems built with signature verification, idempotency keys, exponential backoff, and delivery logging. No more silent failures.

Production Observability

Structured logging, distributed tracing, custom metrics, and alerting wired into Grafana, Datadog, or whatever you're already running. OpenTelemetry instrumentation that actually tells you what's happening inside your system.

Wat we bouwen

TypeScript-First APIs

Every endpoint is fully typed — request validation through Zod, response serialization, generated OpenAPI docs. Your frontend team gets a spec they can use immediately.

Realtime WebSocket Support

Socket.IO or native WebSocket implementations for live dashboards, chat, notifications, and collaborative features. Real-time that works at scale.

Authentication & Authorization

JWT, OAuth 2.0, API key management, and role-based access control. We use Supabase Auth where it makes sense and custom implementations where it doesn't.

Microservices Communication

Event-driven architecture with message brokers, gRPC for internal service communication, and API gateway patterns for external consumers.

CI/CD & Docker

Multi-stage Docker builds, GitHub Actions pipelines, and zero-downtime deployment strategies. Nothing goes down during a release.

Load Testing & Benchmarking

Artillery and k6 load tests are part of the process, not an afterthought. You'll know your system's breaking point before your users find it for you.

Ons proces

01

Architecture Audit

We start by reviewing your existing backend — or your requirements if you're building from scratch. We map the bottlenecks, design the architecture, and hand you a technical spec with data flow diagrams before anything gets built.
Week 1
02

Schema & API Design

Schema design, API contracts defined with OpenAPI specs, authentication flow planning. Everything gets documented and signed off before a line of code gets written. No surprises later.
Week 2
03

Core Implementation

Framework setup, database migrations, core API endpoints, background job infrastructure, webhook handlers. Test coverage ships alongside every feature — not as a follow-up task.
Weeks 3–5
04

Observability & Hardening

Structured logging, error tracking, health checks, rate limiting, load testing. We find the failure modes in staging, not production.
Week 6
05

Deployment & Handoff

Production deployment with monitoring dashboards, runbook documentation, and 30 days of post-launch support. Your team gets a full walkthrough of the codebase so they're not inheriting a black box.
Week 7
Node.jsExpressFastifyNestJSPostgreSQLSupabaseRedisBullMQPrismaDockerVercelAWS

Veelgestelde vragen

Wanneer moet ik NestJS vs Express vs Fastify gebruiken?

Express heeft het grootste middleware-ecosysteem en bijna geen leerproces — het is de veilige standaard voor de meeste projecten. Fastify draait 2-3x sneller, wat belangrijk is voor high-throughput APIs waarbij elke milliseconde telt. NestJS brengt een gestructureerde aanpak — dependency injection, modules, decorators — en is de juiste keuze voor grote teams die tientallen services beheren waar consistentie belangrijker is dan pure snelheid.

Hoe ga je om met databasemigraties in productie?

We gebruiken Prisma Migrate voor schema-versiebeheer. De workflow is strikt: genereer migraties in development, controleer ze in pull requests, test in staging, pas toe op productie tijdens deployment. Destructieve wijzigingen volgen een proces in meerdere stappen — voeg de nieuwe kolom toe, backfill de data, update de applicationcode, verwijder dan de oude kolom. Niks gaat down.

Wat omvat production observability?

Gestructureerde JSON-logging met request correlation IDs, distributed tracing over services via OpenTelemetry, custom business metrics zoals signup rates en payment success, health check endpoints en alerting rules. Grafana of Datadog dashboards geven je request latency, error rates en queue depths in één oogopslag. Je hoort niet meer over problemen van klanten.

Kun je integreren met ons bestaande frontend?

Ja. We bouwen tegen een OpenAPI spec die je frontend team van dag één kan gebruiken. TypeScript client SDKs worden gegenereerd uit die spec, dus je React of Next.js frontend krijgt type-safe API calls zonder dat iemand ze handmatig moet typen. CORS, authentication tokens, WebSocket connections — allemaal afgehandeld.

Hoe ga je om met background jobs en queues?

We gebruiken BullMQ backed by Redis. Elke queue krijgt retry logic met exponential backoff, dead letter queues voor gefaalde jobs, priority scheduling, concurrency limits en een monitoring dashboard. Jobs overleven server restarts. Je kunt ze inspecteren, opnieuw proberen of annuleren via de admin UI — zonder door logs te graven om uit te zoeken wat er gebeurd is.

Wat is het verschil tussen REST en WebSocket APIs?

REST is request-response: de client vraagt, de server antwoordt, de verbinding sluit. WebSockets houden die verbinding open zodat de server data kan pushen zodra iets verandert — wat je nodig hebt voor live dashboards, chat, notifications en collaborative editing. De meeste apps gebruiken beide: REST voor standaard CRUD-operaties, WebSockets voor realtime updates, met dezelfde authentication en business logic eronder.

Node.js Backend Development from $8,000
Fixed-fee. 30-day post-launch support included.
See all packages →
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