I'd suggest this appears somewhat open ended and "define your own role":

before:

> Previously, we built and scaled a profitable SaaS business with 150+ engineers based in New York City. Our technology ingested more than 50 billion events a day - collecting information in real-time across tens of thousands of websites, mobile apps, and mission critical applications.

now:

> With Montauk Labs our goal is to focus on people first and give the team the flexibility to experiment, iterate, and explore new ideas.

with a MarTech focus ...

> Martech (a.k.a., marketing technology, marketing software and marketing platforms) is technology employed in the service of marketing. Martech is used to create, execute, manage, orchestrate, and measure the performance of online and offline content, campaigns and experiences.

If you have any experince | ideas in the domain area and|or kind of tech stacks that could be used then get in touch and indicate what you'd like to do | what you're passionate about - perhaps ask for short term "spitballing" period with an option for longer term involvement if both parties see value in going further.