I wanted to ask how do startup interviews generally work and in what ways do they differ from interviews at Big Tech companies?
Have you tried looking up questions for that company on Glassdoor or Google? Every team and interviewer is different, especially when you move into the start-up world. That said, you might be able to find questions for the company on Glassdoor.
Overall, your best bet is to talk to the recruiter to clarify expectations around the interview process. They should want to help you prepare and give you clear expectations, especially if this is a place you would want to work. Most recruiters would also take this as a positive sign that you are interested and taking their interview process seriously.
Beyond that, general interview preparation (e.g. understanding algorithms and data structures) is always important. Also, especially for a start-up, look at the role you applied to and be ready for questions related to the requirements and responsibilities of the role.
Great question! I've been through big tech interviews and startup interviews as a software engineer, as well as built interview processes at startups. I'd say the most common difference is the variability in interview processes between startups vs the "pretty much know what to expect" between big tech companies (i.e. DSA, systems design, and behavioral). Unfortunately, that means there really isn't a way that startup interviews generally work - so much depends on team composition and size, the role, the stage of the company, etc.
That being said, David's suggestion to talk to the recruiter to clarify expectations is great advice. Just note that that at a startup you may not always be in touch with a recruiter (there may not be one) but instead directly with a hiring manager (a team lead, Head/VP/CTO, even a founder or CEO depending on how early the company is). Same advice applies though - whoever you're in touch with should be able to walk you through the interview process, even if it's super informal.
Something to keep in mind - the maturity of a startup interview process will depend a lot on the stage of the company. A super early, bootstrapped or pre-seed team of 2 non-technical cofounders looking for a founding engineer is going to run a very different process than a Seed or Series A (or later) team with a CTO/VP/Head of Engineering in growth mode.
What I would keep an eye out for regardless of the stage of the company is whether expectations of the interview process match reality (within reason, IMO it's normal/ok for there to be some drift), and whether you feel the company respected your time and was communicative throughout the process.
At a high-level:
Now let's talk preparation techniques:
Wrapping it all up, the following are much more important tactically for startup interview prep: