One-Click Web Login Automation

I want to replace a manual sign-in routine with a single button press. When the user clicks the button, an internal API should automatically pull the target URL, login ID, and password from our database and complete the sign-in on a web application that uses a standard HTML login form.

Here is what I need built:
• A lightweight API endpoint that receives the button event, queries the database for the correct credentials, and returns them securely.
• A headless browser or equivalent automation (e.g., Selenium, Playwright, Puppeteer—use whichever you prefer) that opens the URL, fills in the username and password fields, submits the form, and confirms success.
• Error handling for wrong credentials, time-outs, or changed page structure.
• Clear setup instructions plus concise documentation of the code so my team can maintain it.

A working prototype running on my machine or a small cloud instance is enough for the first delivery; once verified, I will ask for any polish or minor fixes. I am flexible on language—Python, Node.js, or similar is fine—as long as it is reliable and easy to deploy.

If this sounds straightforward to you, let’s get it built.