API-First Way Explained: How to Build A Strong IDP?

Hey there, my follow readers! The modern software environment is such that speed is not sufficient anymore for a competitive edge. Organizations must provide applications faster and more safely, comply with laws, ensure reliability and have their developers be productive. As a result, many enterprises have been moving toward an API First approach in developing their Internal Developer Platform (IDP.). So what is API First and why are the largest technology companies spending so heavily on this model?

This guide will cover building a strong IDP in an API First manner, including the benefits, architecture, implementation process, challenges, best practices, and hopefully, provide you with an understanding of how to leverage this method of development to build a scalable platform that your developers will love.

Definition of the API First Approach

The API First Method is a design and development approach to building APIs prior to developing applications, interfaces or services that want to consume those APIs.

Typically, companies develop their software and then create the APIs after the fact as an afterthought. Conversely, the API First Development process treats APIs as products in and of themselves. Every service, tool, and capability exposed through the platform is done so via defined interfaces from the very beginning.

In the case of Internal Developer Platforms, all platform capabilities (deployment, infrastructure provisioning, monitoring, authentication, security scanning, and service management) should all be exposed to developers through APIs.

Developers no longer need to find their way around complicated development tools and manually interact with infrastructure due to the ability to programmatically access everything through standard programming interfaces (API).

What is an IDP?

An Internal Developer Platform (IDP) is a layer of self-service tools to help developers create, deploy, monitor, and manage applications with little or no knowledge of Kubernetes, cloud infrastructure, networking, or security.

A strong IDP can provide the following features:

• Self-service Infrastructure (provision and configure virtual and/or physical machines without intervention)

• Automated Deployment (automatically deploy applications/infrastructure without manual effort)

• Service Templates (predefined application configurations)

• CI/CD Workflows (automated software development life cycle processes)

• Security Controls (monitor security of the application, including user access)

• Observability Tools (monitor application performance)

• Developer Portals (provide a central location for developers to find useful resources)

• Governance Mechanisms (policies to govern your application development process)

• Reduce operational complexity so developers can spend more time on creating business value.

Why API-First?

Many businesses have developed platforms, but many of those businesses have difficulty getting developers to utilize those platforms. Often, developers will jump around these platforms because the platforms are hard to use or overly restrictive. An API-first approach takes this problem away by creating a more flexible and extensible API.

Improved Developer Experience

Developers want to automate as much of their work as possible. Through the use of APIs, developers can build platform capabilities into their workflows, scripts, integrated development environments (IDEs), and pipelines. Developers can now use a single API call to provision their resources as opposed to doing that through a ticketing system or multiple dashboards.

Greater Scalability

As a business grows, the requirements of its platform become more complex. With API-first platforms, all services can be scaled independently of one another while still communicating consistently. Modularity allows for ongoing growth and improvement of the platform's capability over time.

Accelerated Innovation

New user interfaces, portal experiences, and automation tools can all be developed without changes to the back-end systems. The API acts as a single point of truth or contract for facilitating the delivery of new innovative solutions across the enterprise.

Strong Governance

Standardized APIs provide repeatable enforcement of security policies, compliance mandates, and operational practices. All activities conducted through an API are tracked, measured, and controlled.

Core Principles of an API-First IDP

While building a successful API-first Developer Platform entails more than providing endpoints, the following principles guide the architecture of your platform:

Design First, Code Second

The API specifications should be defined before coding begins. API standards (such as OpenAPI) will allow developers to create contracts for development early on, providing developers with time to work together to deliver the solution.

Consistent Development Experience Across all Services

A developer should have the same experience using authentication, response structures, error handling, and naming conventions on all parts of the platform. Consistency results in a reduction of cognitive workload on the developer.

Default to Self-Service

Every commonly performed task for Developers should be achievable by using an API.

Some common examples are the following:

• Creating environments 

• Deploying applications 

• Obtaining a database 

• Obtaining log files 

• Managing secrets 

• Configuring monitoring

Automating Processes Everywhere

Manual processes are slow and prone to errors.

Automating infrastructure, deployments, testing, compliance checks, and incident response through API driven workflows.

Build Security into the Entire API Layer

Security must be included initially, not added later. All APIs need to include authentication, authorization, auditing, encryption, and policy control at every layer of the API.

Essentials of an API First Internal Developer Platform

A well-designed Internal Developer Platform should be constructed with several connected Layers.

API Gateway

The API Gateway is the entry point for all services in a Platform. Responsibilities include:

• routing requests

• authentication

• rate limiting

• logging

• monitoring

• Enforcing the security of the Gateway simplifies access to the Platform while protecting the services running behind the Gateway.

Service Catalogue

The service catalogue is a central repository of Resources available on the Platform. Developers can use the service catalogue to find:

• Application Templates

• Infrastructure Services

• Databases

• Message Queues

• CI/CD Pipelines

• Monitoring Tools 

APIs allow for simple access to these resources from the service catalogue.

Identity and Access Management

A solid identity system permits only approved users access to services and systems on the Platform. Permissible capabilities include:

• Single Sign On (SSO), 

• Role-Based Access (RBAC), 

• Multi-Factor Authentication, 

• Auditing 

Identity is the foundation for Governance of the Platform.

Infrastructure Automation Layer

Infrastructure provisioning is done via API Automation. Common tools used to provision Infrastructure include:

• Terraform 

• Kubernetes 

• Cloud Providers

• Configuration Management Tools 

Developers will request Infrastructure resources from the Platform and will only be concerned with what resources they want, while the Platform will handle the provisioning accordingly.

CI/CD Integration

For any organization or enterprise that is "API First", integrating CI/CD into that organization should allow any Deployment capabilities from the IDP (integrated delivery platform) to be used via programmable interfaces. Thus, to achieve this effect, Developers should be able to:

• Create new builds and/or trigger builds

• Deploy Applications

• Undo/Roll-Up Releases

• Monitor Deployments

This should all occur without the developer leaving their existing workflow.

Observability Platform

It should be noted that as part of an IDP, there should be multiple observability capabilities that would be API driven as well. This would allow developers easy access to:

• Metrics

• Logs

• Alerts

• Performance Data

• Incident Information

When there is greater transparency into your observability platform, your operational efficiency will be improved.

Steps to Build a Strong API-Driven IDP

Step 1 - Identify the Challenges For Developers

Before starting to build any IDP, identify the challenges developers experience in their daily work. Common developer challenges include:

• Slow Infrastructure Requests

• Complex Processes for Deployment

• Too Many Fragmented Tools

• Lack of Visibility

• Security Bottlenecks

A good IDP is built to resolve the above challenges and, in doing so, will not add a layer of complexity to an already complex system.

Step 2 - Identify the Platform Services

Develop a clear understanding of which services the IDP will provide for its customers, including:

• Environment Provisioning

• Container Orchestration

• Database Management

• Secret Management

• Monitoring

• Security Checks

All of the above services will be available via well defined API’s.

Step 3 - Create API Contract

APIs should be compared and established before the development of the application in order to ensure that the specifications for development are clear. Focus should be placed on defining/creating:

• Structure of the Endpoint

• How Authentication will be performed

• Format of Response(s)

• How Errors will be Handled

• The Versioning Strategy

The properly designed APIs will ease the burden of maintenance afterward.

Step 4: Developer Portal Creation 

Developers need a simple interface they can access easily for anything related to API’s as well as documentation and related information. 

It is best to have the Developer Portal provide a consumer perspective of all APIs available external to your organization to create consistency and help eliminate silos in your platform. 

Step 5: Security Controls Implementation 

Security should be enforced from all layers of your Platform, such as APIs, Applications, and Development Tools, etc. 

Security is most successfully automated to reduce organizational risk. Key Controls are: 

• API Authentication 

• Authorization Policy 

• Encryption 

• Audit Log 

• Compliance Monitoring 

Step 6: Enable Observability 

Track how much of an API has been consumed, how the API performs and on what basis it operates (metrics). 

More specifically: 

• Response Times 

• Error Rates 

• Service Availability 

• Frequency of Deployments 

• Developer Adoption / Usage 

Data analytics on API usage will help you make informed decisions about what you should do to improve overall platform quality. 

Step 7: Continual Improvement 

A successful Integrated Developer Platform has evolved based on feedback from the developers using that platform or the APIs associated with that platform.  Developers provide feedback about: 

• Usability of APIs

• Adoption of the Platform 

• Operational Efficiency of the Platform 

• Security of the Platform 

The continual improvement of the Integrated Developer Platform ensures that it meets the business needs of the organization. 

Common Challenges to the Adoption of API First Integrated Developer Platforms 

Over Engineering 

Many organizations create a platform that is too complicated; Sometimes they create too complex a platform. 

Start with a simple version of your Integrated Developer Platform and make enhancements as needed based on projected demands. 

Poor API Design 

Inconsistent API designs can lead to challenges for developers.  Obtaining proper governance for your APIs early on will help to minimize long-term challenges.

This section discusses important concepts related to security misconfigurations in APIs, low developer adoption rates, best practices for building an API-first identity provider (IDP), and how to measure the success of an API-first IDP.

Security Misconfigurations

APIs provide the potential for powerful capabilities to be leveraged through APIs; therefore, security is an absolute priority. To ensure a high level of security for developers and users, API providers must implement a strong authentication, authorization, and monitoring process.

Low Developer Adoption

Developers will not use APIs if they find it easier to build workarounds than to use the API. Therefore, the experience of the developer using the API should be of primary importance to API developers.

Best Practices for Building an API-First IDP

Approach APIs as Products

All APIs must possess the following features:

• Documentation

• Ownership

• Versioning

• Support Processes

• Feedback Mechanisms

Prioritize Developer Experience

APIs must be measured by their ability to increase developer productivity, not merely by the amount of infrastructure available for use.

Standardize Everything

Standardizing on the same standards across all APIs makes it easier for developers to use your APIs, which subsequently allows software developers to spend less time learning how to use all of the APIs.

Use Open Standards

Selecting open standards such as OpenAPI, OAuth 2.0, REST, GraphQL, and JSON Schema for all APIs improves the interoperability of all of the APIs.

Automate Compliance

All compliance checks, policy enforcement, and security validation need to be automated whenever possible.

Build Feedback Loops

API providers should be continually collecting developer feedback and using this feedback to help direct the future direction of the API platform.