If you login to your express entry profile and check the AOR pdf, it says:
Specifically, let us know if:
• your personal circumstances change: o e.g. birth or adoption of a child, marriage, divorce, death of a spouse, etc.
• your email address, mailing address or phone number changes
• you change your immigration representative
• you want to withdraw your application
• you lose a job offer or lose a provincial or territorial nomination.
So, yes you have to inform them about your marriage.
Just curious what Leadership role are you expecting? Tech Lead / Project Manager / CTO / CEO?
If its ATL or TL then I think you should be fine. Your responsibilities might still match the NOC. But Project Manager / CTO / CEO is a totaly different category and in my opinion you should inform IRCC.
Also, most people recommend informing IRCC if you change you employer. ie. switch companies.
I think it’ll be a TL role only (Def not a CEO material

regarding marriage, I’m really hoping to get married in Canada! But you never know!