Case study · Founding Engineer · Production ERP
Takkada
Standalone Tally-Replacement ERP
A production accounting & ERP platform built end-to-end as founding engineer at Takkada. 139 businesses onboarded, 83 actively syncing their books from Tally, 716K+ vouchers mirrored and 196K receipts in production. Native double-entry accounting core in PostgreSQL, filing-ready GST compliance (GSTR-1/GSTR-3B GSTN JSON export, e-invoice, e-way bill), WhatsApp Business automation, and an AI document-import pipeline, replacing Tally workflows for real businesses.
+23 businesses in 7 days · +62 in 30 days
139 · Businesses onboarded
83 · Active Tally syncs
716K+ · Vouchers mirrored
196K · Receipts
Stack
Flutter / Supabase / PostgreSQL / Next.js / TypeScript
Four layers: Flutter app → Supabase Edge Functions → PostgreSQL (double-entry ledger, RLS) → External (GSTN, WhatsApp API, Gemini/Vertex)
Product surfaces
Marketing site
Live product marketing site — real businesses, real receivables
Mobile purchase flow
Add purchase on mobile: pick a party to create or update a draft invoice
GST invoicing
Line items with HSN and GST split, e-invoice / e-way bill actions, share over WhatsApp
Admin & revenue ops
Partner workspace: payouts, commissions, targets, dealer tiers
What I owned
The work spans product surfaces, data model, backend functions, admin operations, and the desktop sync edge.
App surface
Flutter client flows for registers, parties, vouchers, imports, reminders, reports, and mobile-first operations.
Backend core
Supabase Edge Functions, PostgreSQL schema, RLS-aware services, voucher state, and integration contracts.
Admin and ops
Next.js CRM for partner/admin workflows, plan controls, assisted customer setup, and production support paths.
Tally connector
Desktop sync layer with IPC control, connection testing, company selection, incremental export, and status monitoring.
What shipped
Mined from the local PaySaathi/Takkada app, backend, admin dashboard, and loader histories.
Standalone accounting core
Backend migration arc replaced inherited table/RPC assumptions with app-native voucher families, register periods, bill-wise settlement, ageing, analytics, and financial-statement surfaces.
Voucher and compliance workflows
App and backend commits added GRN/Receipt Note, stock journals, GST return exports, e-invoice/e-way bill tables, invoice-detail columns, PDF rendering, and WhatsApp delivery paths.
Access, tenant safety, and gates
RBAC work covered voucher-type grants, restricted-member behavior, tenant-write guards, license checks, feature gates, granular permission fallbacks, and safer deployment targets.
Admin revenue operations
Admin dashboard commits added MD rate cards, usage views, assisted customer creation, wallet reconciliation, partner/dealer tier controls, onboarding caps, and production Cloudflare deployment constraints.
Tally loader reliability
Loader work covered IPC sync control, GRN/Material In-Out writeback, resumable first sync, checkpoints, per-company last-run status with a live syncing overlay, queue-scoped wait-instead-of-skip scheduling, and SSRF/path-traversal hardening of the download path.
Customer-facing automation
Delivery paths included public buyer orders, payment links, WhatsApp own-number onboarding, template status trails, attached-PDF template provisioning, and polished failure messaging.