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I think Koyfin does a decent job there. Great information density and ability to drill down into things

any idea on their tech stack? Crunchbase just lists "HTML5, jQuery, and Google Analytics" which is not very helpful

When figuring out tech stacks I usually start with their careers page :) https://www.koyfin.com/careers/senior-software-engineer/

Tech Stack: TypeScript, Node.js, NestJS, React, RxJS, AWS, Kubernetes, MongoDB, PostgreSQL