Do not fixate on job title progression alone; your co-founder titles are impressive enough. Outline your area(s) of responsibility on each project, especially if you all rotated roles once in a while.
Focus on growth of both top and bottom lines, and highlight margin improvements over the 4 years and 4 projects. Try to quantify your accomplishments in dollar figures since they stand out more. Statements such as "Grew revenues 50% YoY from $0 to $X million over 36 months" will quickly catch anybody's attention.
Throw in some specific, targeted technical phrases that are keyword friendly and you'll easily be an outstanding candidate.
Be prepared to explain why you'd want to join the target company and not stay at your current company.
TLDR: Hiring managers hone in on results, not only titles. Quantify your business impacts and list your technical accomplishments.
EDIT: Regarding my comment about quantifying your margin impact, for those that don't know, "margin" and "markup" are not equivalent[1]. Thankfully it's really easy for technically inclined folks to grasp this insanely useful financial concept.
[1] http://www.investopedia.com/ask/answers/102714/whats-differe...