Shashank Agarwal

Minsk, Belarus

I own frontend architecture and delivery for Butlerapp (bookings manager and CRM) and TaylorDb (AI app builder). The timeline below follows how that work evolved.

1. Butlerapp Booking Form

   React 16 · TypeScript · UX architecture

   • Rebuilt the legacy booking forms as a modern React and TypeScript application that continued to talk to the existing PHP APIs.
   • Designed and shipped an event cart that worked cleanly on top of the data we already had, rather than forcing a backend rewrite.

2. SchnellTestButler

   React Native · Expo · NativeBase · UX architecture

   • Extended Butlerapp with scheduling flows suited to high-volume COVID testing, covering bookings, queue timing, and result handoff.
   • Built a React Native field app with QR check-in and multi-account access; at peak it was in use at more than 1,500 test centers across Germany.
   • Released the app on both the App Store and Google Play.

3. Butlerapp Dashboard — React Native migration

   React Native · Expo · NativeBase

   • Migrated the class-based React Butlerapp Dashboard to a hybrid React Native app on Expo and NativeBase, and gave the product a full UX overhaul along the way.
   • Designed and built a view system from scratch so operators could save filters, sorting, and layout as reusable views, and made the interface fully responsive.
   • Adopted Autodesk BaseTable to give operators a noticeably faster table experience on large data sets.
   • Reworked filters into filter chips with a ranking model that surfaces the most-used filters first.
   • Added dashboard customization so each customer could match the product to their own branding.

4. TaylorDb — AI App Builder

   React Native · GraphQL · WebSockets · Client-side data layer

   • Led TaylorDb for about two and a half years as it evolved from an app builder into an Airtable-like data product and, eventually, an AI app builder.
   • Treated the client as a local database: all product data arrived over GraphQL on WebSockets rather than REST, so I built a dedicated data-loading layer and a subscription system that kept local state in sync while navigating race conditions as events streamed in. A local-first cache let people start working immediately, with live data filling in over subscriptions as it arrived.
   • Onboarded mid-level engineers and mentored them until they could operate as independent seniors.
   • Compared the React Native component libraries available at the time, then designed and built a greenfield library— react-native-molecules (npm)—to serve as the shared UI foundation across products.

5. Butlerapp Dashboard — upgrades & grid system

   React Native · Widget systems

   • Came back to Butlerapp Dashboard for a major upgrade cycle, including a responsive grid builder and a set of widgets driven by the backend.
   • Implemented self-onboarding so logged-in users could reach value without relying on hand-held setup.
   • Onboarded a junior developer, mentored them through day-to-day delivery, and ran thorough code reviews so quality stayed high as the team moved faster.
   • Currently working on the mobile app for this product surface.

6. Butlerapp Booking Form — React 19 & embed platform

   React 19 · TypeScript · Embeddable widgets · Cross-site integration

   • Re-architected Butlerapp Booking Form around React 19 so the codebase could absorb future change cleanly, and integrated the form into Butlerapp Dashboard so operators work in one continuous experience.
   • The form now runs on more than 200 websites and brings in thousands of bookings each month. It can open on any page that loads the booking scripts, not only a dedicated integration page.
   • Build cross-domain embeddable widgets that sit around the form—calendar, offer card, accordion, table, and user login—so host sites can present inventory in the shape they need.