Gambling App Project. Is this halal?

so, this company i'm associated with, they onboarded a client who needs a gambling gaming app. one of those shady betting apps. i'm suppose to work on the design aspect of it, and basically the entire project too, since i'm the project manager.

is this halal? considering this company has many other clients and this client just happens to be one of them too.

i can't delegate this task to someone else. any guidance would be appreciated