Mikko Juusti enhanced the Tietokilta/web repository by expanding content editing capabilities within Payload CMS, specifically enabling support for H4 headings. He addressed the need for more granular content structuring by implementing a targeted configuration change using TypeScript, allowing authors and editors to utilize an additional heading level in their workflows. The update was delivered as a single, well-documented commit, ensuring clear traceability and simplifying future code reviews or rollbacks. Mikko’s work focused on CMS configuration and TypeScript, demonstrating a precise approach to feature delivery. The scope was narrow but addressed a concrete editorial requirement with maintainable, review-friendly code.