End-to-End
Playwright validates critical browser workflows from the perspective of a real user.
CASE STUDY · SDET · QA AUTOMATION
QA Sentinel
A full-stack quality engineering platform built to demonstrate how automated testing, application development, test execution visibility and continuous delivery can operate as one engineering system.
01
THE CHALLENGE
Automation is more than writing test scripts.
Reliable quality engineering requires test execution, application architecture, data management, reporting and delivery pipelines to work together.
QA Sentinel was developed to demonstrate that broader SDET perspective through a complete application rather than an isolated collection of automated tests.
02
THE APPROACH
Build the product and engineer its quality.
The project combines frontend and backend development with automated validation. This makes it possible to design application behavior while simultaneously considering how that behavior should be tested.
Testability becomes an architectural concern rather than something added after development is complete.
03
TEST AUTOMATION
A layered testing strategy.
Application Testing
Jest supports fast validation of application logic and individual behaviors.
API Testing
Service behavior can be validated independently from the frontend for faster defect isolation.
Regression Protection
Automated suites provide repeatable validation as application functionality evolves.
04
ARCHITECTURE
Full-stack QA engineering architecture.
01Frontend
Next.js application and user workflows
02Backend
Express API and application services
03Database
Supabase and PostgreSQL persistence
04QA Layer
Playwright and Jest automated validation
05Delivery
GitHub Actions, Docker and CI/CD
05
CI/CD
Quality checks belong in the delivery pipeline.
Automated testing becomes more valuable when execution is part of the software delivery process. The project is structured around the idea that changes should be validated continuously instead of relying only on manual verification before release.
01Code Change
Developer pushes a change to the repository
02Build
Application dependencies and build are validated
03Automated Tests
Quality checks execute against expected behavior
04Feedback
Failures become visible before deployment
05Delivery
Validated changes can continue toward production
06
ENGINEERING CHALLENGES
Solving integration problems across the stack.
Frontend / Backend Integration
Maintaining predictable contracts between the Next.js frontend and Express services.
Database Connectivity
Managing reliable application connectivity and environment configuration with Supabase and PostgreSQL.
Reliable Automation
Designing test workflows that provide useful feedback without becoming tightly coupled to implementation details.
Deployment Consistency
Coordinating local development, CI environments and production deployment behavior.
07
TECH STACK
Technology used across the platform.
Next.jsTypeScriptExpressPlaywrightJestSupabasePostgreSQLDockerGitHub ActionsCI/CD
08
OUTCOME
Demonstrating the SDET mindset end to end.
QA Sentinel demonstrates an engineering approach where quality, automation and software development are interconnected. The project covers application architecture, test automation, data, infrastructure and continuous delivery instead of treating QA as a separate final stage.