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Application & Development Security

API Development

Well-documented APIs with authorisation designed in.

Design and development of REST and GraphQL APIs with explicit authorisation models, validation, rate limiting and complete documentation.

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Typical timeline
Typically 4–12 weeks depending on scope
Business benefit
Expose capability to partners without exposing your data.
Industries
Banking & Financial ServicesHealthcareE-CommerceIT & Cloud ServicesGovernmentManufacturing

Overview

What API Development covers

We treat authorisation as the primary API design concern. Every endpoint has a defined actor, object and permission rule, tested automatically on every build.

Documentation, versioning and observability are delivered with the API, not after it.

The problem we solve

APIs built endpoint by endpoint end up with inconsistent authorisation, undocumented behaviour and no protection against abuse.

Scope & outcomes

What we test and what you receive

Scope coverage

  • API design, schema and versioning strategy
  • Authentication and token lifecycle
  • Object and function level authorisation model
  • Input validation and error contracts
  • Rate limiting, quotas and abuse protection
  • Observability, logging and audit trails
  • Automated authorisation test suite
  • Developer documentation and sandbox

Key benefits

  • Consistent, testable authorisation
  • Faster partner and client integration
  • Protection against enumeration and abuse
  • Clear contracts that reduce support load

Deliverables

  • Solution architecture and threat model documentation
  • Production-ready source code with review history
  • Automated test and security check coverage
  • Deployment, environment and secrets configuration guide
  • Handover walkthrough and technical documentation
  • Post-release support window

Methodology

Our assessment process

  1. 01

    Domain and consumer analysis

  2. 02

    Contract-first schema design

  3. 03

    Authorisation matrix definition

  4. 04

    Implementation with automated tests

  5. 05

    Security review of the authorisation model

  6. 06

    Load and abuse testing

  7. 07

    Documentation and sandbox delivery

  8. 08

    Deployment and monitoring setup

  9. 09

    Versioning and support plan

Tooling

Tools and techniques

Tooling supports expert manual testing — it never replaces it.

OpenAPI and GraphQL schema tooling
Automated contract and authorisation testing
API gateway and rate limiting
Structured logging and tracing

FAQ

API Development questions

We choose based on your consumers and data shape, and apply the same authorisation rigour to either.

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Ready to scope API Development?

Talk to our offensive security team about scoping an assessment around your actual risk, stack and timelines.

Book a Security AssessmentTalk to a Security Expert

Prefer email? business@securityloyals.com