I saw requirements for the project.
I can propose you only UX / UI Services (included illustration as you want) without development. I think that this is good approach to prepare first designs and than give it fully docummentated to developers. This approach should have better effort and costs for you.
I have 8+ years of experience in building Digital Products, Trading platforms, SAAS, Mobile, etc..
First please check my portolfio - https://www.freelancer.com/u/balasinski.html
What about me:
I am experienced and talented UX UI Designer. I specialized in Websites, Dashboards UI and Mobile.
I made over 200 projects for startups and huge companies from EU and US.
I love to make greate projects using: Figma, AdobeXD, Photoshop, Sketch, Zeplin, Avocode, JIRA, Slack, Skype, CSS, HTML, Invision, UXPin, Principle..
Feel free to let me know to clarify scope, time and costs.
Thanks
Magic