How about a professional roofer who loves working on flat roofs? Jonathan Baldivino, https://www.facebook.com/Roofscapesnw, Roofscapes NW. He’s a great guy, enthusiastic about his job and does great work.
John Cole Roofing–206.240.3086–did our torch down for us on our little rental house.
Easy to work with–reliable, affordable, great job–and he’s helped out with leaks on our main house.