FrontendData/ML/AIAround since 2011
D3.js / Charting Libraries
Also written as D3.js, D3, Chart.js, Recharts, Highcharts, ECharts
Libraries for drawing charts and data visualisations in the browser. D3 is the powerful low-level option for custom visuals; Chart.js, Recharts, Highcharts and ECharts give ready-made charts with less effort.
Think of it like
D3 is a full art studio; the others are a set of good templates you fill in.
Junior or senior?
Common for dashboard and analytics products. Real D3 depth (custom, interactive visuals) is rarer and more valuable than dropping in a ready-made chart.
Ask them
“What's the most complex chart you built, and why did you pick that library for it?”