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Practice coding interviews with a real judge, in your browser.
3,900+ problems, the study lists everyone recommends, an AI coach, career roadmaps and live opportunities. Your progress is saved locally from the first submission.
Starts with Blind 75. Prefer more coverage? NeetCode 150 or compare lists.
Problems
The full LeetCode catalog with topic and company tags, each solvable in the browser.
Study lists
Blind 75, NeetCode 150, Grind 75, LeetCode 75 and Top Interview 150, with a pattern roadmap.
Spaced review
Solved problems come back for review on a schedule, so patterns stick past the interview.
AI coach
Ask for hints without spoilers, or plan the rest of your prep and career.
Ask the AI advisor
Interview plans, study schedules, roadmaps and programs worth applying to.
Career roadmaps
A clear sequence of skills for each role.
Software Engineer
The generalist path: write solid code, design systems, and ship real software.
6–10 months · 4 stages
Frontend Developer
Build modern, accessible, performant user interfaces.
4–6 months · 4 stages
Backend Developer
Design APIs, databases, and scalable server systems.
5–7 months · 4 stages
Data Scientist
Turn data into insights and predictive models.
6–9 months · 4 stages
ML Engineer
Ship machine-learning systems to production.
8–12 months · 4 stages
DevOps / Cloud Engineer
Automate, deploy, and operate reliable infrastructure.
6–9 months · 4 stages
Opportunities
Programs, contests and internships, with application windows kept current.
2025 applications closed — next cycle opens Mar 2026
Global program where contributors spend a summer writing code for open-source organizations under mentorship.
Mix of paid & unpaid tracks — many projects are unpaid
Paid remote mentorships across CNCF and Linux Foundation projects like Kubernetes, Envoy, and Prometheus.