About NAILDD

One product,
many interview tracks.

Interview prep today is a mess of Glassdoor threads, Stack Overflow answers, and courses that teach syntax instead of judgement. NAILDD consolidates the highest-signal questions from real interview loops — and explains the reasoning interviewers actually want to hear.

1,500+
real interview questions
30+
company guides
5
role tracks

Roles we cover

Each track has its own question bank, skill radar, and topic-cluster guides — calibrated for the seniority and target companies you pick.

💻
Software engineers
Backend, frontend, full-stack, mobile. Data structures, system design, language-specific questions, behavioral loops.
📊
Data & analytics
Data analyst, data scientist, data engineer, ML engineer, analytics engineer. SQL, Python, A/B testing, metrics, ML fundamentals.
🚀
Product
Product manager, product analyst, technical PM. Case interviews, product sense, JTBD, PRDs, prioritization, metrics.
🎨
Design
Product designer, UX, UI. Design critiques, portfolio review, UX case studies, design systems.
🏗
Systems & architecture
Systems analyst, solution architect. REST API design, UML, BPMN, system design, requirements.

How we think about prep

01
Real loops, not textbooks
Every question is sourced from an actual interview at a top tech employer — Google, Meta, Amazon, Stripe, Airbnb, and 25+ others. We track new patterns as they appear.
02
The "why" matters more than the answer
Interviewers reward reasoning, not memorization. Every worked solution explains why the answer works and what trap the question is set up to catch.
03
10 minutes a day beats cramming
Streaks, leagues, and quests are built so prep becomes a daily habit. Most users hit interview-ready in 4-8 weeks of consistent practice.

Behind the product

Tagir Khairutdinov
Founder

6+ years building data products at top tech. Originally launched kariernik.ru — the Russian-speaking sister product — to 4,000+ users with a 5-role question bank. NAILDD is the English-language expansion: same depth, broader scope across the full tech-interview spectrum.

Be there at launch

iOS and Android apps in private beta. Drop your email — we'll send you the App Store / Play Store link the day public access opens, plus a free PDF cheat sheet with the 50 most-asked questions on signup.

Join the NAILDD waitlist

Free PDF cheat sheet on signup. One email when the app launches — no spam.

No spam. One email when the app launches.