Payroll software with accounting integration — Carvajal

The problem

Payroll processes with fragile dependencies between the core system and external accounting systems at enterprise clients. Each client demanded adaptations that piled up as technical debt.

The approach

I built the software on Oracle DB with PL/SQL, Oracle Reports and Oracle Forms. I customized functions and procedures integrated into the core. I designed the accounting integration linking payroll transactions to external systems, replicable across clients.

• Custom PL/SQL integrated into the payroll core.
• Accounting integration as a well-defined contract — not a per-client hack.
• Deployed across multiple enterprise clients.

The outcome

• Replicable integration across enterprise clients — the pattern saves work on every new onboarding.
• Maintainable payroll logic on Oracle PL/SQL.
• Solid baseline for scaling new core modules.