Building Internal Developer Platforms with ASP.NET Core: Tools, APIs, and Automation
Empower development teams with self-service tools, reusable APIs, and automated workflows
As organizations grow, software development often becomes slower rather than faster. Teams spend increasing amounts of time requesting infrastructure, configuring environments, creating new projects, managing deployments, and solving repetitive operational problems. Internal Developer Platforms (IDPs) address these challenges by providing developers with self-service tools, standardized APIs, reusable templates, and automated workflows that reduce friction and accelerate delivery.
In this guide, we’ll explore how to build an Internal Developer Platform using ASP.NET Core and create a foundation that allows development teams to focus on writing business features instead of managing infrastructure.
Why Development Slows as Teams Grow
A small startup might have:
Five developers
One application
One deployment pipeline
Everyone knows where everything is.
Need a database?
Someone creates one.
Need a new API?
Someone builds it.
Need production access?
Just ask.
Everything works.
Until it doesn’t.
As organizations grow, so do requests.
Developers begin asking questions like:
Can someone create a Kubernetes namespace?
Can I get a SQL database?
Who creates Azure resources?
Where do I request secrets?
How do I deploy to staging?
Which logging standard should I follow?
Eventually engineers spend more time waiting than building.
What Is an Internal Developer Platform?
An Internal Developer Platform is software built for developers inside an organization.
Instead of manually requesting resources, developers use a platform to provision them themselves.
Think of it as an internal app store.
Instead of installing games, developers request:
New projects
Databases
Storage accounts
API keys
Kubernetes environments
Deployment pipelines
Everything follows company standards automatically.
Why Organizations Build Internal Platforms
The biggest goal is reducing developer friction.
Without an IDP:
Developer writes ticket.
Operations creates infrastructure.
Security reviews access.
Platform team configures deployment.
Developer waits.
With an IDP:
Developer clicks a button.
Platform performs everything automatically.
The developer continues working.
Platform Engineering vs DevOps
These terms are closely related.
DevOps focuses on collaboration between development and operations.
Platform Engineering creates products that help developers succeed.
Instead of manually helping every team, platform engineers build reusable tools.
Those tools become the Internal Developer Platform.
Understanding Self-Service Development
Imagine buying groceries.
Years ago, every item required asking a shop assistant.
Today we simply use self-checkout.
Internal platforms work the same way.
Instead of requesting resources manually, developers provision them independently.
The platform performs all the complicated work behind the scenes.
What Can an Internal Developer Platform Provide?
A mature platform might offer:
Project templates
API creation
Infrastructure provisioning
Secret management
Logging configuration
Monitoring dashboards
CI/CD pipelines
Deployment approvals
Security scanning
Documentation
Developers interact with one consistent interface.
Why ASP.NET Core Is a Great Choice
ASP.NET Core excels at building internal tools.
It offers:
High performance
Cross-platform support
Excellent security
REST API development
Background services
Identity integration
Cloud-native capabilities
These features make it ideal for building platform APIs.
Designing the Platform
Think of the platform as multiple services working together.
Developer Portal
│
▼
Platform API
│
┌──────┼────────┐
▼ ▼ ▼
Templates Deployments Infrastructure
│
▼
Cloud ResourcesEach component has a specific responsibility.
This separation keeps the platform maintainable.
Building the Platform API
Everything begins with an API.
Developers request services through HTTP endpoints.
Example:
POST /projectsPayload:
{
"name": "InventoryService",
"template": "webapi"
}The platform performs the remaining work automatically.
Creating the API
Example:
app.MapPost("/projects",
(ProjectRequest request) =>
{
return Results.Ok(
$"Creating {request.Name}");
});Simple APIs often orchestrate much larger workflows.
Automating Project Creation
Suppose every microservice requires:
Standard folder structure
Logging
Health checks
Docker support
OpenTelemetry
Authentication
Instead of manually configuring each project, developers choose a template.
The platform generates everything consistently.
Project Templates
Templates eliminate repetitive work.
A template might include:
Authentication configured
Swagger enabled
Logging configured
Dockerfile included
CI/CD pipeline ready
Unit tests added
Every new service begins with the same high-quality foundation.
Managing Templates
Templates evolve over time.
For example:
Version 1:
.NET 8
Basic logging
Version 2:
OpenTelemetry
Health checks
Distributed tracing
Rate limiting
Developers automatically benefit from platform improvements.
Infrastructure as Code
Infrastructure should never be created manually.
Instead use:
Bicep
Terraform
ARM Templates
The platform invokes these tools automatically.
Developers simply request resources.
Provisioning Cloud Resources
Imagine a developer needs:
Azure SQL
Azure Storage
Service Bus
Key Vault
Instead of opening multiple Azure portals, they submit one request.
The platform provisions everything.
Background Processing
Some operations take several minutes.
Examples:
Creating Kubernetes clusters
Deploying infrastructure
Provisioning databases
ASP.NET Core Background Services handle these long-running jobs efficiently.
Example:
public class ProvisioningWorker
: BackgroundService
{
protected override async Task ExecuteAsync(
CancellationToken token)
{
while (!token.IsCancellationRequested)
{
await Task.Delay(5000, token);
}
}
}Background workers keep APIs responsive.
Building a Developer Portal
The portal becomes the front door of the platform.
Developers can:
Create projects
Request environments
View deployments
Browse documentation
Monitor applications
Everything is available from one location.
Authentication
Only authorized developers should access platform resources.
ASP.NET Core Identity integrates easily with:
Microsoft Entra ID
Azure AD
OAuth
OpenID Connect
Authentication ensures platform requests remain secure.
Authorization
Different developers require different permissions.
Examples:
Developers
Create projects
Team Leads
Approve production deployments
Platform Engineers
Manage templates
Administrators
Configure infrastructure
Policy-based authorization keeps permissions manageable.
This builds directly on concepts from our previous article on advanced authorization.
API Versioning
Internal platforms evolve continuously.
Versioning prevents breaking existing developer workflows.
Example:
/api/v1/projects
/api/v2/projectsExisting automation continues working while new features are introduced.
Logging Platform Activity
Everything the platform does should be logged.
Examples:
Project created
Deployment started
Database provisioned
Secret generated
Audit logging becomes especially valuable for compliance and troubleshooting.
As discussed in our previous article, audit logs provide accountability across complex systems.
Monitoring Platform Health
An Internal Developer Platform quickly becomes business-critical.
Monitor:
API availability
Provisioning success rate
Deployment duration
Queue lengths
Failed workflows
Health checks and OpenTelemetry provide excellent visibility.
This connects naturally with our recent observability articles.
Building for Reuse
One of the biggest goals of an IDP is eliminating duplicated effort.
Instead of every team solving the same problems independently, the platform provides reusable solutions that everyone benefits from.
This creates consistency across the entire organization.
Coming in Part 2
Our Internal Developer Platform can now provide developers with self-service tools and standardized project creation, but there’s still more work to do before it becomes a truly enterprise-ready platform.
In Part 2, we’ll automate CI/CD pipelines, provision development and production environments on demand, manage secrets securely, implement deployment approvals and governance, and explore how to scale the platform across multiple teams. We’ll finish by building a complete real-world Internal Developer Platform that helps developers deliver software faster while maintaining security, consistency, and operational excellence.
Closing Thoughts
An Internal Developer Platform is much more than a collection of internal tools. It becomes the foundation that enables development teams to work faster, deliver more consistently, and spend less time on repetitive operational tasks. By providing self-service capabilities, standardized templates, automated infrastructure provisioning, and reusable APIs, organizations can reduce bottlenecks while improving security, reliability, and developer experience. As your platform evolves, you can expand it with automated deployment pipelines, environment provisioning, secret management, governance controls, and observability, transforming it into a central hub that supports every stage of the software development lifecycle.
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