duolingo
20
Open roles
Machine Learning
Top skill required
duolingo has 20 open data and tech roles, with Machine Learning the most-requested skill (35% of listings).
Source: Datamata Studios — methodology and update cadence.
Tech stack
Skills that come up most across duolingo's 20 open roles, ranked by how often each one appears.
% of their open roles that mention this skill.
Open roles
Seniority mix
Hiring by domain
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Further reading
chmod 755 vs 644: which permission should you use?
When to use chmod 755 versus 644—what each octal mode grants, why directories need the execute bit and how to pick safe defaults for files and folders.
chmod -R: changing permissions recursively and safely
How to use chmod -R to change permissions on a whole directory tree without making files executable—plus the find and capital-X tricks that keep folders usable.
How to write a counter offer email that works
A clear structure for a counter offer email—how to open, where to put your number and how to stay warm—plus a template you can adapt and send in minutes.