The entire interview process is technically focused.
It includes a phone interview, a shared coding site, and a short period for questions after solving.
The onsite portion consists of four 1-hour interviews plus lunch. The people were very friendly, all very clever, and asked interesting problems. They queried my understanding of the language by asking about specific implementation details.
I am not able to share specific questions, but my suggestion would be to practice Google Code Jam problems.
The following metrics were computed from 21 interview experiences for the Jane Street Software Engineer role in London, United Kingdom.
Jane Street's interview process for their Software Engineer roles in London, the United Kingdom is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Jane Street's Software Engineer interview process in London, United Kingdom.