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NodeTech

An engineering agency for backend, web and mobile: Node.js, TypeScript and AWS serverless. Registered in France, serving Europe, North America and the Gulf in English, French and Arabic.

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    3. API Development & Microservices

    API Development & Microservices

    REST and GraphQL APIs that partners build against: contract-first, versioned, documented.

    Overview

    Our engineering track record includes a public B2B marketplace API: about twenty serverless microservices exposing the full marketplace lifecycle to resellers and cloud vendors who integrate with it daily. That is the standard we bring: OpenAPI contracts before code, versioned endpoints (v1/v2) that never break a consumer casually, strict validation, and documentation a third-party developer can actually use.

    gatewayapi gateway + endpoints

    Stack & tools

    • Node.js / TypeScript
    • REST
    • GraphQL
    • OpenAPI / Swagger
    • AWS API Gateway
    • InversifyJS
    • Postman
    • SonarQube

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    Use cases

    • Public APIs for partners and marketplaces
    • Versioned REST and GraphQL endpoints backed by OpenAPI contracts
    • Microservice architectures with shared internal libraries
    • Developer documentation and change communication

    Business benefits

    Contract-first
    OpenAPI and GraphQL schemas agreed and enforced before implementation starts.
    Versioned, not broken
    Consumers keep working through changes: deprecation paths instead of surprises.
    Consistent by construction
    Shared libraries for validation, errors and clients, so every service answers the same way.
    Observable
    Every endpoint monitored: error rates, latency and deprecated-usage reporting.

    Process

    1. 01

      Contract design

      Domain model, resource mapping, versioning strategy.

    2. 02

      Build and validate

      Implementation against the contract, with strict payload validation.

    3. 03

      Document

      Reference docs and examples aimed at the integrating developer.

    4. 04

      Monitor and evolve

      Error alerting, usage reporting, deprecation management.

    What we take on

    Services →

    • Serverless Architecture Consulting on AWS

      Serverless architecture consulting on AWS: we design, build and operate event-driven platforms with Lambda, Step Functions, SQS and EventBridge.

      →

    • Backend Takeover & Modernization

      We take over existing backends and modernize them without stopping delivery.

      →

    • Performance & Scale

      Measured optimization of backends under real traffic: latency, throughput and cold starts.

      →

    Frequently asked

    REST or GraphQL?

    REST when external partners or simple resources dominate; GraphQL when clients need flexible aggregation. We have shipped both on the same platform.

    How do you handle breaking changes?

    Versioned endpoints, deprecation windows, and automated reporting on deprecated-endpoint usage so consumers are warned before removal.

    Can you build an API for third-party developers?

    Yes. This service is built on exactly that: a public marketplace API live since 2023, developer portal included.

    Do you write the documentation too?

    Yes. An API without usable documentation is a support queue.

    Ready when you are.

    Tell us what you are working on. Reply within 24 hours, one-page diagnostic within 48.

    Get a one-page diagnostichello@nodetech-consulting.com