Data Structures & Algorithms
AI-generated solutions, dry runs, and pattern flashcards.
Practice DSA the way it shows up in real onsites — with worked solutions, dry-run walkthroughs, and spaced-repetition flashcards on the underlying patterns. Built for engineers prepping FAANG, fintech, and product-startup interview loops.
Free to start · Pro at $9.99/mo unlocks unlimited tutor + mock interviews
Who this track is for
- CS new-grads + early-career engineers prepping for FAANG / unicorn loops.
- Self-taught engineers who want pattern-first practice, not raw problem grinding.
- Anyone who finds Leetcode editorials too terse — we explain every step.
Why Coachingle for DSA
What separates us from the problem-banks + recorded courses.
Pattern-first, not problem-first
Every solution links to the underlying pattern (sliding window, monotonic stack, etc.) so you build transferable intuition, not memorize specific problems.
AI-walked dry runs
Our agentic tutor solves the problem step-by-step, then asks Socratic follow-ups. You learn the why, not just the answer.
Spaced-rep flashcards
Patterns + complexity proofs surface at D+1, D+3, D+7, D+21 — the only DSA prep app that fights forgetting on a schedule.
Mock interview integration
Practice in a real interview loop with our AI interviewer, get a scorecard PDF you can share on LinkedIn.
What you'll cover
Concept coverage drilled across cheatsheets, flashcards, quizzes, and mock interviews.
- ✓Arrays + two-pointer / sliding window
- ✓Hashing + frequency counters
- ✓Trees + DFS / BFS / level-order
- ✓Graphs + Dijkstra / Union-Find
- ✓Dynamic programming + memoization
- ✓Greedy + interval scheduling
- ✓Bit manipulation + advanced math
- ✓System-prep adjacent: behavioral STAR drilling
Frequently asked questions
How is this different from Leetcode?
Leetcode is a problem bank; Coachingle is a learning system. We layer pattern explanations, dry runs, spaced-repetition flashcards on the patterns, and an AI tutor that asks you Socratic follow-ups. You can still grind Leetcode in parallel — many of our users do.
Do I need Pro to use the DSA track?
No. The free tier includes daily cheatsheets, pattern flashcards, and quizzes. Pro ($9.99/mo) lifts the daily quota on the AI tutor + unlocks the AI mock interview with scorecard PDFs.
Which interview loops does this prep for?
FAANG (Google, Meta, Amazon, Apple, Netflix, Microsoft), unicorns (Stripe, Databricks, Anthropic, OpenAI, etc.), fintech (Bloomberg, Two Sigma, Citadel), and most US/UK product startups. We focus on coding rounds — system design has its own track at /skills/system-design.
Can I share my mock interview scorecard on LinkedIn?
Yes — Pro users get a public scorecard page + PDF download. The page renders OG metadata so it looks polished when shared. Many of our users use this as a portable interview-readiness signal.
Ready to drill DSA?
Free to start. No credit card. Pro at $9.99/mo unlocks the AI mock interview.