Accounting and ERP Integrations

Six accounting and ERP integrations for a manufacturing SaaS platform, built on Kotlin and Spring Boot services

Role: Full-stack engineer
Status: Shipped
Period: 2023–present
Stack: Kotlin, Spring Boot, PostgreSQL

Problem

Customers of the platform keep their books in different accounting and ERP systems. I built integrations with six of them: QuickBooks, Odoo, Xero, Comatic, Bexio, and LexOffice. Each has its own API, its own auth model, and its own idea of what an invoice, a customer, and an account look like.

Constraints

Existing stack. The work lives in Kotlin and Spring Boot services on PostgreSQL.
Real customers, real money. These systems hold enterprise customers' financial records. An error lands in someone's books, not just on a screen.

Architecture

Platform services

Kotlin, Spring Boot

PostgreSQL

Integration layer

QuickBooks

Odoo

Xero

Comatic

Bexio

LexOffice

High-level shape only, as described on my résumé; internals are not shown

Platform services on PostgreSQL reach six external accounting systems through an integration layer.

Results

Built six accounting and ERP integrations: QuickBooks, Odoo, Xero, Comatic, Bexio, and LexOffice.
On the same platform I supported 20+ enterprise customers from onboarding through production and drove 5+ of them to go-live.