Most engineers let their interview fitness decay. Don't be most engineers.
You don't get physically fit after the emergency — you maintain it so emergencies don't cost you. Interview Fitness works the same way. 400,000+ tech layoffs since 2023. The engineers who land in two weeks aren't cramming — they've been staying sharp all along. 10–30 minutes of on-demand practice per day. One readiness score. Always ready.
Interviewers test all three. Most prep covers one.
LeetCode only tracks algorithms. But you can ace every technical round and still lose the offer if your behavioral stories are weak or you can't discuss basic system design. Your readiness score is weighted across all three.
Algorithms & data structures
The part everyone thinks about. 18 core patterns — Arrays, Graphs, Dynamic Programming, Trees, Heaps, and more. AI-generated quizzes test whether you actually understand the trade-offs, not just whether your code ran.
- 18 patterns covering every category FAANG interviewers test
- Conceptual quizzes, not just LeetCode acceptance rate
- Time/space complexity and when to use each pattern
STAR story bank
The pillar that eliminates offers. Engineers who ace the technical round but stumble on "tell me about a conflict" get rejected every day. You need 6+ polished stories — with AI feedback to sharpen them before the real interview.
- 6+ STAR stories across leadership, conflict, failure, and growth
- AI reviews your drafts for clarity, specificity, and impact
- Written in your voice, not a generic template — interviewers can tell the difference
Conceptual trade-offs
Mid-level roles don't need expert-level architecture. They need you to intelligently discuss trade-offs: when to use Redis vs. Memcached, how CDNs reduce latency, why you'd choose eventual consistency. Conceptual quizzes across 14 patterns prepare you for exactly that.
- 14 system design patterns: caching, load balancing, sharding, replication, and more
- Trade-off framing — not memorized diagrams, but reasoned decisions
- The baseline every mid-level interviewer assumes you can clear
Overall score: 85%+ = ready to interview confidently at mid to senior level.
Weighted: Technical 70% + Behavioral 20% + System Design 10%
Three steps. One number.
No 12-week rigid program. No daily streak pressure. A readiness system that works around your schedule — and gives you one honest number to track.
Step 1
Take the gap assessment
Find out where you actually stand in 10 minutes.
Most engineers think they're more ready than they are. The diagnostic doesn't ask if you've heard of binary search — it tests whether you can explain it under pressure. 12 questions across all three pillars. You'll get a readiness score and a clear picture of your biggest gaps.
Most engineers score 35–55% on their first assessment. That number is what we fix.
Step 2
Practice on-demand across all three pillars
Netflix model — practice when you want, what you want.
No forced curriculum. No guilt if you skip a week. Open the app when you have 10 minutes and run an AI-generated quiz on your weakest pattern. Your readiness score updates in real time. Insurance Mode is built for engineers with real jobs and unpredictable schedules — not college students with 8 hours a day.
10 min on Tuesday + 3 hours Saturday = the same progress as any rigid daily streak.
Step 3
Reach 85%+ — and keep it there
One number tells you if you're ready. No ambiguity.
85%+ across all three pillars means you can walk into an interview without the "I hope they don't ask about graphs" anxiety. Most engineers get there in 6 weeks. Once you're there, Insurance Mode keeps you at that level with minimal weekly effort — so if a layoff hits tomorrow, you're already 80% of the way there.
Insurance Mode average: 8-12 months of retention. One layoff avoided pays for 5 years of the subscription.
The design is backed by research
Every decision — from how quizzes are generated to why the product is framed as insurance — traces back to how humans actually learn and act on fear.
Spaced Repetition
Ebbinghaus, 1885The finding
Without reinforcement, people forget roughly 70% of new information within 24 hours. Spreading practice across days dramatically slows decay.
How we use it
Quiz generation surfaces your weakest patterns more frequently. The more you struggle with Graphs, the more Graphs shows up — until the retention holds.
Deliberate Practice
Ericsson et al., 1993The finding
Naive repetition produces little improvement. Expert growth requires structured tasks at the edge of current ability, with immediate corrective feedback.
How we use it
AI-generated quizzes adapt to your current level. Easy patterns don't generate easy questions forever — the difficulty calibrates to keep you in the growth zone.
Feedback Loops
Hattie & Timperley, 2007The finding
Feedback ranked as one of the single most powerful influences on learning outcomes in a meta-analysis of over 500 studies.
How we use it
Every quiz submission gets immediate AI feedback — not generic tips, but pattern-specific analysis of your answer. The window between wrong answer and correction is minutes, not days.
Fear as Motivation
Loss Aversion, Kahneman 1979The finding
Humans are twice as motivated by avoiding losses as they are by achieving equivalent gains. The fear of losing a job is a more powerful motivator than the hope of getting a better one.
How we use it
Insurance Mode frames readiness as protecting what you have, not chasing what you want. That emotional framing is why Insurance users practice consistently — the stakes feel real.
Common questions
What's the difference between Insurance Mode and just grinding LeetCode?
LeetCode tells you if your code ran. codezilla tells you if you're ready to interview. That means tracking readiness across algorithms, behavioral stories, and system design — the three pillars every mid-level interviewer tests. It also means knowing your gaps, not just accumulating problems solved. Insurance Mode is a readiness system, not a problem library.
How long does it take to reach 85%+?
Most engineers hit 85%+ in 6 weeks at 10–30 minutes per day. If you have an interview in two weeks, you can front-load the highest-weight patterns (Graphs, DP, Trees) to move your score faster. The platform shows you exactly which gaps are dragging your score down so you never waste time on things you already know.
What if I miss a week? Does my progress reset?
No. Your readiness score and completed patterns persist forever. Insurance Mode is not a streak app — it's not designed to guilt you. It's designed to keep you in the 75–85% range with minimal ongoing effort. Miss a month, open the app, and your score is exactly where you left it.
What does the gap assessment actually test?
12 questions across all three pillars — 5 technical (conceptual, not coding), 3 system design (trade-off reasoning), 2 behavioral (STAR story quality), and 2 self-assessment questions. Takes 10 minutes. The output is a readiness score and a ranked list of your biggest gaps, which becomes your starting practice queue.
What patterns are covered?
38 patterns total: 18 technical algorithms (Arrays, Hash Tables, Two Pointers, Sliding Window, Linked Lists, Stacks, Trees, Graphs, Binary Search, Heaps, Backtracking, Tries, 1D DP, 2D DP, Greedy, Union-Find, Topological Sort, Dijkstra's), 14 system design patterns (caching, load balancing, sharding, CDNs, replication, and more), and 6 behavioral categories (leadership, conflict, technical failure, cross-team impact, growth, and ownership).
What's the money-back guarantee?
If you complete the program — meaning you engage with all three pillars and reach the 6-week mark — and you're not at 85%+ interview readiness, we refund you. No ambiguity. The guarantee is the point: we're confident enough in the outcome to put money on it, and that should tell you something.
Outcome Guaranteed
85%+ interview-ready in 6 weeks, or your money back
Take the 10-minute gap assessment. See your score. Then decide. Less than $1/day to keep the anxiety of “what if I got laid off tomorrow” permanently off your plate.