The problem
As AI commoditizes coding, architecture judgment is the skill that compounds.
Books teach patterns. Shipping teaches judgment. This is the place to build judgment without waiting for the next staff-level project to hand it to you.
How it reads your design
Write your design. See the concepts you're still missing.
Each attempt returns the two concepts most likely to cost you next time. Those go into your review queue.
Your design
Rate limiter · 1M req/sDesign a distributed rate limiter for an API gateway at 1M req/s. Cover the algorithm, where counters live, and how you handle hot keys.
Live evaluation
7 dimensionsReview queue
The score is only useful if it turns into practice. Deltaframe queues the concepts that cost points, then brings them back before the next attempt.
Hot-key mitigation
Bottleneck analysis missed the write hotspot.
Review due
Today
Token bucket vs sliding window
Algorithm choice needs a clearer trade-off.
Next review
3 days
Two tracks, one loop
Coaching or Interview Prep.
Same practice loop, different pressure. Switch whenever your situation changes.
Coaching
Build the skill from the ground up.
Warmer feedback, explanations, and a review queue tuned to the concepts you keep missing. Progress measured over weeks, not one attempt.
Use when
Engineers building the skill from the ground up — or rebuilding it after years on adjacent stacks.
Interview Prep
Know where you stand before the interview does.
Strict scoring, time pressure, and an honest readout of where you stand. Only the gaps that still matter before the interview.
Use when
Engineers with an interview in days or weeks and limited prep time.
Questions
What people ask before they start.
Get notified when we launch
One email when the full practice product is live. No spam.