Valon Mortgage·Software Engineer·Technical Phone Screen
Jul 2026
Valon Mortgage gave me a coding round that was basically 'build a tiny in-memory database from scratch.' One question, but it sprawled in every direction once I started implementing it.
- Design and implement a simplified in-memory database that supports INSERT, SELECT with column projection, WHERE filtering, and ORDER BY on a single fixed-schema table.
“I started with the insert and select logic pretty confidently, but the WHERE clause is where things got messy.”