Another option is Topcoder, a marketplace that matches businesses with a global pool of AI practitioners, software developers, designers and data scientists. It offers a broad range of services from AI applications like chatbots and predictive maintenance to data science and web development, so you should be able to find the right people to help your team's capacity and expertise.
If you want a more streamlined hiring process, Braintrust uses AI to optimize the hiring process and offers a full-stack hiring platform. Its low-fee model and transparent experience for clients and talent means it can be a relatively affordable way to tap into the best technical talent for your AI/ML projects.