The 250: a coding interview sprint for ML and AI engineers

What it is

A spreadsheet that turns coding interview prep into a schedule. Every problem is a public LeetCode problem, tagged with its pattern, difficulty and priority, plus a one-line key idea and a note on how an interviewer is likely to extend it. You decide how many days you have; the sheet tells you what to solve each day and tracks what you keep missing.

Who it is for

• ML, AI and data engineers who are strong in their domain but rusty at timed coding rounds
• Anyone with a loop booked in two to eight weeks who wants a plan rather than a longer list
• People who have solved problems before but forget them under pressure

What is inside

• Bank: 250 problems across 24 patterns. 108 must-do (P0), 120 core (P1), 22 stretch (P2). Each row has the pattern, difficulty, practice mode, key idea, a follow-up framing, its sprint day and week, a LeetCode Premium marker, and columns for status, attempts, last attempt and miss type.
• 18-day sprint: the 108 must-do problems in three phases. Six days of learning new problems, a cold re-check day, seven days of mixed practice, three days of timed simulation and a taper day before the interview.
• 8-week plan: all 250 problems by week and pattern, for a slower pace.
• Progress: live counts by pattern, priority, status and miss type, so weak patterns show up at a glance.
• Patterns: a one-page map of the 24 patterns and when each one applies.

How to use it

1. Open “Start here” and pick the 18-day sprint or the 8-week plan.
2. Each day, filter the Bank by sprint day or week and solve those problems.
3. After every attempt, set the status and log the miss type: clean, needed a nudge, bug, complexity wrong, or did not know.
4. Check the Progress sheet weekly and move time toward the patterns with the most misses.

Works in Excel, LibreOffice and other spreadsheet apps.