Head over to the Opportunities section of Riffle, and find the "open filters & views" button near the top of the project list.
Use the "Project Contributors" filter to search for yourself. This will filter the table to show only projects you are working on.
💡 Tip: you can filter to an even more granular level using the "Opportunity Phase Owner" filter to search & find a list of all the projects you are leading/own.