Build a secure multi-firm client management web app (Apex CRM pilot MVP)

Apex CRM is a client management product for professional services firms (law, accounting and financial advisory). We have a front-end shell (installable web app, responsive for phone and desktop, offline page, service worker) but no server, database or login, so data only lives in the browser...

(Budget: $250 - $1200 AUD, Jobs: API Development, Database Development, JavaScript, Progressive Web Apps, Security, Web Development)