Architecture notes

How the integration lab is structured.

A structured view of the system shape: Angular as an inspection client, parallel backend prototypes, identity protocol flows and Java/SOAP integration work. The notes focus on responsibilities, contracts, validation concerns and stack tradeoffs.

High-Level Flow

Angular client

NestJS API

.NET API

SAML + certificates

Java / SOAP track

Angular Client

The Angular application acts as a visible harness for triggering authentication and API calls, comparing responses and making callback and error paths easier to inspect.

NestJS / Node.js API

The Node lane explores controller and service structure, SAML-style login/callback endpoints, DTOs and Swagger documentation.

ASP.NET Core / .NET API

The .NET lane covers API controllers, request/response DTOs, Swagger/OpenAPI generation and certificate-aware processing helpers.

Java / Spring Client

The Java lane focuses on JAX-WS, Apache CXF, WSDL-generated models, XML security, signing utilities and OpenSAML-oriented flows.

Integration Responsibilities

Area Technical concern Portfolio evidence

Browser to API Triggering login flows, observing redirects, callback states and typed responses. Angular harness, response previews and visible error-state handling.

API to identity protocol SAML-style request generation, callback handling, artifact correlation and response interpretation. Architecture flow, responsibility split and validation-focused discussion.

API to contract layer DTO contracts, Swagger/OpenAPI schemas and generated TypeScript models. Contract-first description of frontend/backend agreement.

Java to SOAP/WSDL Generated service models, CXF/JAX-WS clients, XMLSec and signing-oriented utilities. Stack comparison and service-client responsibility split.

Validation Surface

The lab is framed around observable integration behavior: generated contracts, typed API responses, callback handling, protocol error separation, certificate-aware processing and service-client validation checks.

Failure Modes Considered

Typical risk areas include schema drift between API and frontend types, invalid callback state, artifact mismatch, expired or missing certificate material, XML canonicalization issues and SOAP client generation drift.