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copied!<p>I have also been in your position, and I agree it is a difficult one. In my case, I was building custom single-product sites for clients. While each site followed a similar layout and workflow, there had to be enough flexibility for each to have a wholly custom design, custom rules around shipping and coupons, and different merchant gateways and configurations.</p> <p>After some years, we did end up with something maintainable. First, we created libraries to house all of our common code and put those libraries into a TFS project simply called Common. Then, we created a new TFS project for each site (not client, as many clients had multiple products/sites) and branched the applicable projects into them from Common. Next, we created a VS Template project that contained a skeleton of the site, including "design-less" views, controllers, and their action methods (remember, each site had the same basic flow). Also, each site ran on its own database, which was cloned from an otherwise unused and mostly empty Template DB.</p> <p>With each site running on its own branch and DB, modifications could be made to the original flow and design that was installed by the template (which would never need to be merged back in) without affecting any other site. For customizing business methods, like shipping calculations, we could create a subclass of the common class and override where needed. Part of what enabled this was converting all our code to use Dependency Injection. Specifically, each Controller had injected Services, and each Service had injected Repositories. Merchant Processing was also coded to an interface and injected. Also worth mentioning is that this allowed us to hard-code all of the upsell logic for each site (you bought product X, so we recommend Y), which was much easier to create and maintain compared to defining complex configuration rules in our old upsell rule engine. I don't know if you have anything like that...</p> <p>Sometimes we would want to make a change to the Common code itself, which was usually prompted by a specific need for a specific site. In that case, we'd make the change on that branch, merge it to Common, and then merge it to the other sites at our convenience (great for "breaking" changes or changes that also required a change to the DB). Similarly for DB changes, we would update the Template DB and then write a little script to update the other site DBs with the same schema changes ( still had to be smart and careful about it).</p> <p>An added benefit was that we also created Mock repositories that would be used/injected in a "Design" build configuration, which enabled the designers to jump around the application and work on screens without literally submitting themselves to the workflow. It also allowed them to start working on a site before there was anything done on the back-end, which was very important for those anxious clients who need to "see something".</p> <p>10+ clients is definitely not a small number with what you're talking about. Three was pain enough for me. We had over 30 sites running at one time, maintained by three developers and two designers.</p> <p>Finally, I know it's outside the scope of your question and a bit presumptuous, but getting "final" client sign-off on design before the designers actually went about implementing it (and before devs did their thing) also saved us a lot of costly rework. I know no design is final, but increasing efficiency on the implementation end gave the clients less time to change their minds about the design they approved. </p> <p>I hope that at least gives you some approaches to think about.</p>

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