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API Design & Architecture

Seamless System Interconnectivity

A poorly designed API is technical debt that compounds with every consumer. We design APIs the opposite way: starting with the OpenAPI contract, generating server stubs and client SDKs from it, and enforcing contract tests in CI so no consumer ever discovers a breaking change in production. Our APIs are versioned, rate-limited, and observable from day one.

API Design and Architecture — REST, GraphQL, gRPC
0
Breaking Changes in Prod
Contract tests catch every breaking change in CI
<50ms
P99 API Latency
Optimised query patterns and connection pooling
100%
Auto-Generated SDK Coverage
Client SDKs from OpenAPI spec — always in sync
99.99%
API Availability
Multi-region gateway with circuit breakers
How we work

Our Methodology

Every engagement follows the same rigorous process — Agile delivery with TDD, contract testing, and observability built in from day one.

01

Domain Modelling & Resource Design

We model your domain entities and derive resource boundaries before writing a single route definition.

  • Event storming
  • Domain-Driven Design
  • Resource boundary mapping
  • CQRS pattern evaluation
02

Contract-First Design

OpenAPI spec is written first, reviewed by all consumers, and locked before implementation begins. No surprises.

  • OpenAPI 3.1 spec authoring
  • Stoplight / Redoc design
  • Consumer review workshops
  • Versioning strategy (URI vs header)
03

Contract Testing with Pact

Consumer-driven contracts with Pact ensure that producer changes never silently break consumers — enforced in every CI pipeline.

  • Pact provider verification
  • Consumer contract publishing
  • Breaking-change detection (oasdiff)
  • Load testing (k6)
04

Gateway, Auth & Observability

API gateway (Kong/AWS), OAuth 2.0 / API key auth, rate limiting, and OpenTelemetry distributed tracing ship with every API.

  • Kong / AWS API Gateway
  • OAuth 2.0 + PKCE
  • Rate limiting + quotas
  • OpenTelemetry traces + Grafana
Technology

Tech Stack

Battle-tested tools chosen for production reliability — not for the conference talks.

RestfulGraphQLgRPCProtobufNode.jsFastifyNestJSExpressPostmanSwaggerAWS KMS
Why us

Why Work With YakshLabs

9 years of lead engineering across 20+ enterprise systems. We bring architecture expertise, production scars, and a delivery process that makes outcomes predictable — not hopeful.

Book a Free Strategy Call

We Design for Consumers, Not Servers

An API is not done when the server works — it is done when the developer experience is effortless. We write documentation, code samples, and SDKs as part of delivery.

Breaking Changes are a Solvable Problem

With OpenAPI diff tooling, Pact contract tests, and strict semver policies, we have maintained zero consumer-facing breaks across 20+ API versions.

Transport-Agnostic Expertise

REST, GraphQL, gRPC, WebSocket, Server-Sent Events — we choose the right transport for each use case, not the fashionable one.

What You Get

Every engagement delivers concrete, ownable artefacts — not just a working system.

OpenAPI 3.1 specification
Auto-generated client SDKs (TypeScript, Python)
API contract testing suite
API gateway configuration
Postman collection + documentation
Rate limiting and auth implementation

Ready to build API Design?

Book a free 30-minute strategy session. We'll review your requirements and give you an honest technical assessment — no boilerplate proposals.