I did a few fixed bid, but tried to avoid them since so much is outside your control and a larger company can easily take advantage of you (even unintentionally

I did a few fixed bid, but tried to avoid them since so much is outside your control and a larger company can easily take advantage of you (even unintentionally). 2 ways typically (most all models are a form of one of these two): 1. Per resource type/experience etc, per week (per day for < week of effort) -- typical for software dev jobs where the change requests and evolution can destroy you otherwise. 2. Results based billing -- Used when we were handling more of the process, e.g. helping to bring product to market, marketing, content, ads, campaign management, product placements etc We mostly used a combination of the two as we matured and wanted to start make more than just a percentage on time, which to be honest is a hard way to make money and doesn't scale nicely. Results (revenue) based billing is awesome but can also leave you hanging a little sometimes, so structure and terms are really important. Results/revenue billing is the way to make much better margins and not be tied to a persons time, but recognize it isn't without risks. Terms are critical and I generally only did these with U.S. based companies because of legal & tax complexities.