Tribe of Mentors might be a bit more popular than Spoj. We know about 1 link to it since March 2021 and only 1 link to Spoj. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Have you looked at spoj.com? It has a fair amount of different problems, some of them are pretty creative, you can take an inspiration from that. Source: about 3 years ago
Tim Ferris is an author, podcast host, and entrepreneur who focuses on performance, optimization, self-development, and business. He’s the author of 4-Hour Workweek, Tools of Titans, and Tribe of Mentors (all my favorite books!). Source: about 3 years ago
CodinGame - CodinGame provides users with a fun and effective way to learn coding that eschews the rigid structure of traditional teaching methods.
Mentorcam - Mentorcam is a marketplace where people can access well-known public figures for 1:1 advice and mentorship.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Frontend Mentor - Supercharge your front-end skills by building in a real-life workflow. Solve real-world HTML, CSS and JavaScript challenges whilst working to professional quality designs.
LeetCode - Practice and level up your development skills and prepare for technical interviews.
Mentory - On demand career mentors to succeed at work.