Hi,
i'm senior software engineer (.Net & Sharepoint& project server) with more than +8 years experience. i have a solid knowlege in Sharepoint 2010/2013/2016,Office 365, Project Server 2010/2013/2016,If you'd like to view my previous work, take a look on my Freelancer Portfolio..I would approach your project by starting with wireframes and getting the design completed, before starting the actual development phase. I am highly qualified for this project and would love to speak with you further about taking this project on.
i've developed multiple workflow projects on sharepoint before.