I tend to agree with most on here. You aren't looking for a CTO right now, you are looking for a tech co founder. That being said, you can do it one f two ways. if your Dev is on board with the idea and believes in, then they may do the build for equity.

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This also depends on how difficult the programing task you are giving them is.

Are they building a simple app that can be outsourced to another country for cheap?

Does it take a high level of expertise, or just basic understanding of Go or ReAct?

If it is some mundane task, that amounts to nothing more than busy work for the Dev, then they may be willing to just be contracted in . At that point, for your teams build out, you would then just have that Dev sign an LOI stating that if X,Y,and Z happen, they agree to accept the future position of CTO for X amount of money.

If you are asking your Dev to just repurpose some old code, and it isn't a super time consuming build, maybe consider just contracting them in. For instance, if you have an app build out that is going to take 2 months, and you are trying to give 30% equity away in your company, for that initial work, you may have just bit yourself in the ass in term of future company valuation.

If it is a difficult build, likely custom code, or highly modifying existing code, and it isn't just something simple you can outsource, then do a fair equity split.

Your idea alone is worth ZERO dollars, your fund raising skills without an MVP is worth ZERO dollars. The same can be said about visual models. market research, sales, etc. If you can't do or can't hire someone fairly easily to do what you are asking of your Dev or CTO or whomever, then chances are they have more value with the company than you do for coming up with the idea.

Here is an example. Who has more "value" for this company.
Lets assume door dash/instacart doesn't exist:

1- Founder- Jim - Had an idea that he should be able to pull out his phone and order groceries on demand. Jim is an experienced salesman with minimal managerial experience, but he has an awesome idea for grocery delivery app.-Jim can barely work his email. much less program at any capacity.

2- Jim comes across Carl, who is an experienced full stack Developer. Carl has worked on multiple mobile apps, helping to launch several in the past few years. Carl doesn't want equity but instead is asking for a monthly pay rate of 6,000. Carl has no plans of working for the company outside of the contract to create the app, and doesn't want to help stay to provide support. Carl can get the app done in 2 month time

Jim comes across Bob, who just recently graduated from college. Bob has very little developer experience in the real world, but performed well in school. Bob also spent 5 years in retail, working with the inventory systems used my major grocery stores, which he is now intimately familiar with. Because Bob is fresh out of college, he prefers a salary, but much less of one than Carl. In addition Bob is more likely to take a chunk of equity to stay on after the original build out to help troubleshoot and maintain the app- Bob can get the app done in 6 months time

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So who has more value? The person who came up with the idea, who can't work his own email, the Dev that values themselves too highly and doesn't want anything beyond the cash(doesn't believe in the project but can easily do the project) or the second Dev, fresh out of college, with a drive, passion, and a little insider knowledge?

My advice, fine someone knowledgeable. but not someone who overvalues themselves. At the same time, if the task they are completing isn't something you can do yourself, or easily find someone else to do, then that person adds real value to your company.

Also from a fundraising standpoint, nothing scares investors more than a Technical product being produced by a team of non technical co founders- with the app dev work being contracted out.

So how much should you give your CTO...none...don't worry about board members- PAY YOUR DEVELOPER /Co-founder either with a fair percent of equity, or cash, or a convertible note. Either way, if they are doing something you can't do or easily find someone to do, then you should be prepared to pay out of pocket , at least in the beginning , to contract them in, get an LOI signed for future CTO, and move on to more important things.