Ranking quant dev interview types

Leadcode double penetration. F tier. Tells you more about how much somebody can memorize than what they know. Teach me this. A tier. Shows you whether the candidate bothers to keep up or is just grifting. Write tests for this. A tier. All senior devs I know look at tests before writing code. Data structure implementation. A tier. Tells you about their level of curiosity. Debug this. S tier. Shows you how the candidate thinks. Make this more efficient. A tier. Tests both reading and writing code. Implement this. B tier. If a candidate has never heard of the concept, they can trip up. Otherwise, fair game. Quant system design. C tier for juniors, B tier for anybody else. Sometimes assumes too much industry expertise.