Certificate of completion
Presented to
Crimson Sad
For successfully completing and defending Mission 2, Build a Book Collection Manager.
Skills mastered
Verified by Sigmaschool on 3 August 2026
https://sigmo.dev/crimson-sad-1aeda1/certificates/m2
This certificate was awarded to Crimson Sad on 3 August 2026 for completing Mission 2, Build a Book Collection Manager, at Sigmaschool.
What that means: “I can build a collection manager that stores data in an array of objects and renders it to the page with the DOM, and explain every line of it.”
Sigmaschool is a mastery-based programme where students build real, working software instead of watching lectures. Every mission is shipped to a live URL, walked through on video, and marked by a human instructor before it counts, so a certificate here means the work was seen and defended, not just finished.
