Featured Project

FDC WhatsApp Cheque Bot

Released

A WhatsApp bot that reads photographed cheques with GPT-4o Vision and posts receipt vouchers straight into Busy accounting — the part I built independently on a team project.

Released Featured FastAPI · OpenAI · Evolution API

Project Snapshot

Status Released

Project Type Featured Case Study

Core Stack 9 technologies

Access Private build

Overview

Project Snapshot

For a distribution business that wanted every cheque in their Busy accounting software without staff learning it. An employee photographs a cheque on WhatsApp; the bot extracts amount/date/party/bank with GPT-4o Vision, matches the party (including learned alternative names), fetches unpaid bills, and writes the receipt voucher into Busy.

It was a team project; the WhatsApp cheque bot was mine to build and own.

Key Features

Overview

01

Cheque processing

GPT-4o Vision OCR with orientation handling; documented 10+ OCR approaches to get handwriting right.
Queue-based bulk processing — send a stack of cheques at once.
Accuracy is measured from operator approve/disapprove feedback in the dashboard.

02

Quotation & catalog

RAG catalog search with LangChain/LangGraph + pgvector + OpenAI embeddings.
Busy integration over an RDP/SQL-Server bridge for parties, bills, and vouchers.

Tech Stack

Core Stack

FastAPI
OpenAI

Application Layer

Evolution API
PostgreSQL

Data & AI

pgvector
LangGraph

Delivery

Redis
GCP
Nginx

Architecture

Tech Stack

Stack

FastAPI + PostgreSQL/pgvector + Redis
WhatsApp via Evolution API
Deployed on GCP Compute Engine behind Nginx

Results

Impact

Accuracy (self-reported, dashboard-measured)

Before

After

Impact

~95%+ overall; ~99% catalog/party

Manual cheque entry

Before

5–30 min

After

photo on WhatsApp

Impact

no accounting-software training

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