--- title: API Development | Software Development | Claritas One description: API development — REST, GraphQL and gRPC design; OpenAPI contracts; versioning; rate-limiting; authentication; developer-experience tooling. url: https://claritasone.com/services/software-development/api-development canonical: https://claritasone.com/services/software-development/api-development kind: service source: https://claritasone.com/services/software-development/api-development author: Claritas One datePublished: 2016-01-01 dateModified: 2026-04-18 updated: 2026-04-18 publisher: Claritas One --- # Enterprise API Development *Services / Software Development* > We design, build, and govern API platforms that connect enterprise systems, enable third-party integrations, and power the partner ecosystems that distinguish market leaders from their competitors. Our API practice brings product thinking to technical infrastructure — treating your API as a business asset with its own versioning strategy, developer experience, and commercial model. Whether you are exposing internal capabilities as a revenue-generating product or modernising a legacy integration layer, we deliver APIs that are secure, observable, and built to evolve. [Home](https://claritasone.com/) › [Services](https://claritasone.com/services) › [Software Development](https://claritasone.com/services/software-development) › **API Development** ## Overview APIs are the connective tissue of the modern enterprise — and their quality directly determines how quickly your organisation can integrate acquisitions, onboard partners, and respond to market opportunities. A poorly designed API that requires breaking changes, lacks comprehensive documentation, or fails under load is a tax on every team that depends on it. Claritas API engineers apply OpenAPI-first design methodology, ensuring your API contract is defined, validated, and published before implementation begins. This discipline reduces integration errors, accelerates partner onboarding, and creates the audit trail that your information security and legal teams require for third-party access governance. ## Our Approach ### 1. API Product Strategy & Design We facilitate an API design workshop with your engineering, product, and partnership stakeholders to define the API's consumer personas, use cases, and commercial model. OpenAPI specifications are authored as the single source of truth before implementation begins. ### 2. Security Architecture & Access Control Authentication and authorisation strategies — OAuth 2.0 with PKCE, mTLS, API key management, and JWT validation — are designed with your security team. Data classification governs which fields are exposed to which consumer tiers, with field-level encryption applied to sensitive attributes. ### 3. Implementation & Integration API endpoints are implemented against the agreed OpenAPI specification with automated contract testing to prevent regression. Integration with your identity provider, rate limiting infrastructure, and API gateway (Kong, AWS API Gateway, Apigee) is completed as part of the core build. ### 4. Developer Experience & Documentation A branded developer portal with interactive API reference, code samples in five languages, authentication guides, and a sandbox environment is delivered alongside the API. Developer experience is treated as a first-class product requirement, not an afterthought. ### 5. Observability & Governance Every API is instrumented with per-consumer usage metrics, latency histograms, error rate tracking, and anomaly detection. API lifecycle governance — deprecation notices, migration guides, and sunset policies — is documented and automated. ## Capabilities - OpenAPI-first design methodology with machine-validated contract testing - RESTful API development: resource modelling, HATEOAS, and versioning strategy - GraphQL schema design, federation, and persisted query implementation - API gateway configuration: Kong, AWS API Gateway, Apigee, and Azure APIM - OAuth 2.0, mTLS, JWT, and API key management at enterprise scale - Rate limiting, throttling, quota management, and consumer tier enforcement - Branded developer portal with interactive documentation and sandbox - API analytics: per-consumer metering, SLO tracking, and anomaly alerting ## Outcomes | Metric | Value | | --- | --- | | API availability SLA | **99.95%** | | P99 gateway latency target | **<50ms** | | OpenAPI specification coverage on every engagement | **100%** | | Average partner integration time with our developer portal | **5 days** | ## Next Step **An API platform is your most scalable distribution channel.** Engage our API practice to design and deliver an integration platform that accelerates partner onboarding, enables new revenue streams, and governs third-party access with enterprise-grade security. → [Get a proposal](https://claritasone.com/get-a-proposal) · [Contact us](https://claritasone.com/contact) --- View the live page: About Claritas One: · Contact: · All pages: