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Case Studies / Full-Stack Business Software

HR Operations Platform

A solo-built HR workflow platform connecting employee records, attendance, leave, payroll, policies, reporting, and role-based administration across web and mobile surfaces.

Public status

Personal project - active

Verified delivery

3
Connected product surfaces: backend, admin, and mobile
PostgreSQL
Shared operational data model
Generated data
Lifecycle walkthrough evidence
Generated-data employee setup workflow in the HR Operations Platform
Generated-data interface capture from the verified Admin CP lifecycle walkthrough.
Project type
Personal project
Period
2026
Development
Active development
State
Personal project - active

90-second walkthrough

Generated-data operator workflow.

A public-safe excerpt from the verified deployed-site lifecycle recording. It follows organization setup, employee creation and readback, staff access, and the start of the attendance workflow using generated records.

Silent screen recording · generated demonstration data · no employer records or credentialsDownload MP4 · 1.9 MB

Architecture and API proof

One data model across operator and employee workflows.

Sanitized from the implemented project structure and employee-directory GraphQL contract.

Operator surface

React admin portal

Records, approvals, payroll, policies, and reports

Employee surface

Expo mobile app

Attendance, requests, balances, and documents

Application boundary

NestJS GraphQL API

AuthEmployeesAttendanceLeavePayrollPoliciesReports

Shared records

PostgreSQL

One operational model for people, roles, attendance, leave, payroll, documents, and reporting.

Docker-based development runtime

Public-safe architecture view. Infrastructure addresses, credentials, employer records, and private deployment details are intentionally excluded.

Sanitized API sample

Employee directory query

A reduced read-only selection from the implemented admin query. It shows typed filtering and joined organizational data without exposing authentication, endpoints, IDs, or real employee information.

query EmployeeDirectory($filter: EmployeeFilterInput) {
  employees(filter: $filter) {
    employeeNumber
    fullName
    status
    department { name }
    designation { title }
  }
}

01 / Challenge

The workflow before the system

HR administration often joins records, attendance, leave, payroll support, documents, and management follow-up across separate files and tools.

02 / Approach

How I designed the response

I independently designed a modular NestJS and GraphQL backend, React admin portal, Expo mobile app, and PostgreSQL data model around those connected workflows.

Authentication and account provisioning
Company, department, and role settings
Employee records and location assignment
Attendance and leave workflows
Payroll processing and payslips
Policy documents and reporting

03 / Outcome

Delivered an integrated HR workflow across backend, admin, mobile, PostgreSQL, role-based access, employee records, attendance, leave, payroll, policies, and reporting, verified through a generated-data lifecycle walkthrough.

04 / Workflow

Before

  • Records and follow-up are split across files and separate tools
  • Attendance, leave, payroll support, and documents require manual reconciliation
  • Reporting depends on repeated cleanup

With the system

  • Configure companies, departments, roles, and employee records
  • Record attendance and submit requests through bounded workflows
  • Review approvals, balances, documents, payroll records, and reports
  • Use generated demonstration data for public-safe lifecycle verification

05 / Engineering proof

Architecture

  • Bun workspace with NestJS GraphQL backend, React admin portal, and Expo mobile app
  • Modular monolith structure for bounded HR domains
  • PostgreSQL-backed runtime with Docker-based development
  • Separate web-admin and mobile surfaces over shared backend workflows

Verified evidence

  • Repository documents the backend, admin, mobile, database, and verification commands
  • Implemented modules cover authentication, employees, attendance, leave, payroll, policies, and reporting
  • A deployed Admin CP lifecycle walkthrough was verified with generated data

06 / Judgment

Tradeoffs

  • A modular monolith keeps deployment practical while preserving domain boundaries

Why it matters

  • Models fragmented HR administration as one connected workflow
  • Demonstrates backend, web, mobile, and data-model ownership
  • Shows practical business-software engineering without relying on AI as the headline

What this proves

I can independently design and build full-stack business software across backend, web, mobile, records, roles, approvals, and reporting.

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