A software engineer I know spent four months grinding through LeetCode problems randomly. She solved 340 of them. Then she walked into a Google phone screen, got a sliding window question she’d “seen before,” and blanked completely on the approach. She got the offer eventually, but not until she restarted with the Blind 75 and actually understood why those 75 problems exist.
The Blind 75 isn’t magic. It’s a curated list that first circulated on the Blind app around 2018, when a Facebook engineer posted it as “the minimum viable problem set for FAANG interviews.” Whether or not that framing still holds in 2026 is debatable. But the underlying logic is sound: these 75 problems cover roughly 15 coding patterns, and if you genuinely understand those patterns, you can adapt to most interview problems you’ll see.
What the list is actually teaching you
The 75 problems map to patterns, not to topics. Topics are things like “binary trees.” Patterns are things like “traverse with two pointers and track a running state.” The distinction matters because interviews rarely give you an exact problem you’ve seen. They give you a variation, and your job is to recognize which pattern applies.
The main pattern families in the Blind 75:
- Sliding window (arrays, strings)
- Two pointers
- Fast and slow pointers (cycle detection)
- BFS and DFS on trees and graphs
- Dynamic programming (1D and 2D)
- Binary search and its variants
- Merge intervals
- Heap and priority queue usage
- Tries (prefix trees)
- Backtracking
Dynamic programming is where most people get stuck. Honestly, I think DP is overrepresented in the Blind 75 relative to how often it shows up at mid-level interviews. If you’re applying to Google or Meta at senior level, yes, grind the DP problems hard. If you’re interviewing at a Series B startup, two pointers and BFS will carry you further than Coin Change 2.
A 7-week study structure that doesn’t burn you out
Seven weeks at 6-8 problems per week. That’s the pace. Not a sprint.
Week 1 and 2: Arrays, strings, and two-pointer problems. These are the most immediately applicable. Problems like Two Sum, Best Time to Buy and Sell Stock, and Valid Anagram teach you to think about hash maps and sorting as lookup tools.
Week 3: Trees and graphs. Do them back to back, because the traversal logic is the same. BFS on a graph and level-order traversal on a binary tree are the same algorithm wearing different clothes.
Week 4: Binary search and heap problems. Binary search problems that aren’t obviously binary search (like Search in Rotated Sorted Array) are the hardest version of this pattern. Spend extra time on these.
Week 5: Dynamic programming, part one. Start with 1D DP: Climbing Stairs, House Robber, Coin Change. Do not skip to 2D until these feel automatic.
Week 6: Dynamic programming, part two, plus backtracking. This is the hardest week. Combination Sum and Word Break show up in interviews more than people expect.
Week 7: Review and timed mock sessions. Go back to problems you got wrong. Do a 45-minute timed session where you pick 2 problems at random and solve them without hints.
How to actually practice (not just read solutions)
Here’s the thing most people do wrong. They look at a problem, get stuck for 10 minutes, check the solution, say “oh that makes sense,” and mark it done. That’s reading, not practicing.
A better loop:
- Spend 20-25 minutes on a problem. If you’re completely stuck after 25 minutes, look at the hint or the approach, but not the code.
- Implement the solution from scratch, without copying.
- After solving, write down in one sentence what pattern this problem is an instance of.
- Three days later, solve it again from memory. If you can’t, you don’t know it yet.
The spaced repetition piece is what separates people who “did the Blind 75” from people who can actually use it under interview pressure. Tools like Anki work fine for this, or just a spreadsheet with a “review date” column.
What interviewers are watching that LeetCode doesn’t test
LeetCode grades you on whether your code passes test cases. Interviewers grade you on something different. According to a 2024 analysis from the Stack Overflow Developer Survey, communication and problem-solving approach rank among the most valued traits hiring managers look for, not just raw coding ability.
This means: narrate your thinking out loud. When you see a problem, say “my first instinct is X, but I’m worried about the edge case where Y, so let me try Z instead.” Interviewers at Google, Stripe, and most companies with structured loops specifically evaluate whether you can communicate your reasoning, not just whether you arrive at the optimal solution.
I’ve seen engineers solve a problem perfectly in silence and not move forward, while engineers who talked through a slightly suboptimal approach got offers. The talking is part of the job.
When the Blind 75 isn’t enough
For staff-level or principal interviews at large companies, the Blind 75 is a floor, not a ceiling. You’ll also need system design fluency (the Blind 75 doesn’t cover this at all) and behavioral question depth. The BLS Occupational Outlook projects software developer roles growing 17% through 2033, which means interview volume at top companies isn’t going down. Competition for senior roles is getting tighter.
If you’re targeting senior roles at companies with heavy system design rounds, treat the Blind 75 as a six-week warm-up, then spend three more weeks on Grokking System Design or equivalent resources.
For everyone else, 75 problems with genuine pattern understanding is a reasonable preparation floor. The question is whether you’re actually drilling the patterns or just collecting solved problems.