For the two interviews that I had this year in EU (1 Fintech, 1 health tech, mid-level, remote, startups), I didn't prepare much other than looking what the company was doing, considering how I'd fit in there and got 2 offers.
I'd recommend to brush up the fundamentals - not in terms of knowing all the search algorithms out there, but to have a solid understanding of the bulding blocks of the web, stuff like CAP theorem etc.
Being honest about what you don't know also seems right.
- location: remote companies with different "original" location (Germany (remote), Barcelona, London)
- role: Software Engineer (full-stack roles, mid-level)
- years: 1.5
- industry: again, all over the place, from Fintech to EdTech
- employer: mostly companies with <200, some startups