As someone with a lot of experience using all the main tools on the market I’d advise that traffic split and assignment is the just the tip of the iceberg when it comes to making your own tool.

If it’s a tool you ever want to get into production you need to focus on which metrics you are collecting, how you’re collecting them, how you’re defining a session, how are you defining a user, how are you complying with data privacy laws, what tools and data platforms are you integrating with, what safeguards are you implementing to ensure that you’re not leaking sensitive information, how are you handling code delivery, how are you accounting for ad blockers… to name a few.

I’d personally look for some open source tools and assess what features they provide/how they provide them to get a good idea of what is required. Better yet, I’d try and get some trials on the current market leaders such as AB Tasty, Optimizely, Web Trends Optimize, Monetate and VWO.

You’ll notice that they all offer more than just A/B testing…

Thanks for responding, I appreciate the insights here! I'm not focused on offering every single feature at the moment. This is a brand-new project and also is not in the same market as the products you have mentioned (AB Tasty, Optimizely, etc.). Those products may offer a lot more than A/B testing, but for my situation, I have a single, clear problem that I want to solve which doesn't require much.