HR Management System — Talent Lifecycle Architecture

An HR platform touches the most sensitive data in a company and the most error-prone process in it: payroll. We built a cloud system covering the full talent lifecycle — recruit, onboard, pay, review — with a tax engine that stays correct as rules change and access controls granular enough for HR, managers and employees to share one system safely.

A React / Next.js frontend runs the employee, manager and admin surfaces. A Node.js backend with Prisma ORM models the domain against a Supabase-hosted PostgreSQL database, using Supabase Auth and row-level security so every query is scoped to the caller's role. Payroll runs as a deterministic, versioned calculation so a historical payslip can always be reproduced.

Payroll is unforgiving and jurisdiction-specific: tax slabs and deductions change, and a wrong number is both a compliance and a trust failure. The challenge was a variable tax engine that stays auditable across rule changes, combined with access control strict enough that no employee ever sees another's compensation.

• A variable tax calculation engine with versioned rule sets, so payroll for any past period recomputes exactly as it did then.
• Granular role-based access control backed by Supabase row-level security — data is filtered at the database, not just the UI.
• Interactive OKR and performance-review boards linking goals to review cycles.
• An applicant-tracking funnel with résumé parsing to move candidates through stages with less manual data entry.