The step up from mid-level is scope of ownership. Interviewers stop asking whether you can build the thing and start asking why you built it that way, what you rejected, and what broke afterwards.
Engineering loops are the most structured of any discipline, and the most predictable. Expect a recruiter screen, one or two technical rounds, a system design conversation at mid-level and above, and a behavioral round that is usually underestimated.
The technical rounds are rarely won on the answer. They are won on narration — whether the interviewer can follow your reasoning while you work, and whether you say the trade-off out loud instead of silently picking one.
Each round is run by the interviewer built for it, with its own scoring axes — not one generic interviewer asked to change subject.
System design, trade-offs, and war stories from production.
Scored on Technical communication · Engineering depth · Ownership & collaboration
System design, trade-offs, and war stories from production.
Scored on Technical communication · Engineering depth · Ownership & collaboration
Hands-on problem solving, code quality, debugging, and engineering judgment.
Scored on Problem-solving communication · Engineering correctness · Adaptability & craft
System design, trade-offs, and war stories from production.
Scored on Technical communication · Engineering depth · Ownership & collaboration
Hands-on problem solving, code quality, debugging, and engineering judgment.
Scored on Problem-solving communication · Engineering correctness · Adaptability & craft
Six you can expect, in the register interviewers actually use. Answer them out loud before you read the next section — reading a question and answering one are different skills, and only the second is marked.
The gap between these two is most of your score, and it is easier to see than to be told.
“Describe a technical decision you made that you would make differently now.”
A decision that turned out fine, described as a mild regret. It dodges the question and reads as an unwillingness to be wrong in front of an interviewer.
A real one with a cost attached — what you chose, what it cost the team six months later, what signal you now watch for. Seniority is measured by whether you can hold your own mistake without either minimising or over-apologising.
The post-mortem nobody sends you. These are specific to this loop rather than general interview advice.
For Senior Software Engineer, a general round runs with Kai — system design, trade-offs, and war stories from production. It is the fastest way to find out which round you actually need to work on. The first session is free.
Practise a Senior Software Engineer interview →Before you practise, it is worth reading how the common rounds are marked: tell me about yourself, behavioral questions and STAR, and system design.