Act as a senior full-stack software architect and enterprise HR system designer.

Build a production-ready, module-based Professional HRM Web Application using:

• Backend: PHP (OOP, MVC structure preferred)
• Frontend: HTML5, CSS3, JavaScript (AJAX where needed)
• Database: MySQL (well-structured relational schema)
• Security: Secure authentication, validation, and protection against SQL injection, XSS, CSRF

The system must be clean, scalable, logically structured, and follow professional HR workflow standards.

🎯 Core System Requirements

1️⃣ Authentication Module

Create a secure authentication system:

Features:

• Login page
  • Email/Username + Password
  • “Remember Me” functionality (secure cookie-based token)
• Registration page
• Logout
• Password hashing using password_hash()
• Session management
• Role-ready structure (admin/staff expandable)

2️⃣ Dashboard Module (Data Visualization + Smart Overview)

Design a modern, clean dashboard UI with:

Dashboard Widgets:

1. Total Employee Counter
2. Gender Ratio Pie Chart (Male/Female)
3. Contracts Ending Soon
   • List staff names whose contracts end within next 90 days
4. Latest Signed Contracts
   • Show recently signed employees
5. Departments Overview
   • List all departments
   • Show number of staff per department
6. Global Smart Search Bar
   • Can search any staff field (name, phone, department, contract date, etc.)
   • Clicking result goes directly to the Single Staff Page

Use:

• Chart.js (or equivalent JS chart library)
• AJAX for live search

3️⃣ Department Module (CRUD)

Create a complete Department Management Module:

Fields:

• Department Name
• Description
• Created At

Features:

• Create Department
• Edit Department
• Delete Department
• View Department
• Display total staff count in each department
• Prevent deletion if staff exists (or require confirmation logic)

4️⃣ Staff Module (Core HR Logic Module)

This is the main system module.

A. Create Staff Page

Fields:

• Staff Name
• Staff Image (upload to /uploads/)
• Date of Birth
• Age (Auto-calculated)
• Living Address
• Home Address
• Cellphone
• Gender
• Department (Dropdown, relational)
• Onboarding Date
• Employee Contract Signed Date
• Employee Contract End Date (Auto calculate 3 years)
• Remark

Requirements:

• Image validation
• Age auto-calculation (JS + backend validation)
• Contract duration default: 3 years
• Clean form UI
• Server-side validation required

B. Staff List Page

Display all active staff in a professional table:

Features:

• Pagination
• Column filtering
• Search
• Sort
• Action buttons:
  • View
  • Edit
  • Delete

Delete should:

• Soft delete preferred (status change)
• OR move to resigned table

C. Single Staff Page

Two modes:

1. View Mode

• Display full staff profile
• Profile image
• Department
• Contract details
• Status badge (Active / Resigned)

2. Edit Mode

• Editable form
• Update information
• Update contract if needed

Additional Action:

• “Resign Staff” Button

5️⃣ Employee Contract Module (Connected to Staff)

Separate but relational module.

Fields:

• Staff ID (Foreign Key)
• Contract Signed Date
• Contract End Date
• Status (Active / Ended)
• Created At

Business Logic:

• Default duration = 3 years
• When staff resigns:
  • Contract auto ends
  • Contract record marked as ended (not deleted ideally)
• When staff re-onboards:
  • Must create new contract
  • Old contracts preserved for history

6️⃣ Resigned Staff Module

Create a separate page for resigned staff.

Features:

• Same table layout as Staff List
• Additional column: Resign Date
• Action button: “Re-Onboard”

Re-Onboard Logic:

When clicked:

• Staff status changes back to Active
• Must sign new contract
• New contract record created
• Old contracts remain as history

🧠 Business Logic Requirements

System must:

• Maintain clean relational integrity
• Use foreign keys
• Use transactions where necessary
• Never lose historical contract data
• Avoid direct hard deletes where possible
• Maintain audit timestamps

🗂 Database Design (Required)

Design normalized tables such as:

• users
• departments
• staff
• contracts
• resignations (optional if separated)
• password_remember_tokens

Use:

• Proper indexing
• Foreign key constraints
• ENUM or status fields

🎨 UI/UX Requirements

• Clean, professional HR SaaS-style interface
• Sidebar navigation
• Top navigation bar
• Responsive design
• Clear workflow
• Status badges
• Confirmation modals
• Form validation feedback

🔒 Security Requirements

• Prepared statements (PDO preferred)
• CSRF tokens
• File upload validation
• Session regeneration on login
• Role-ready access control
• Input sanitization

📈 Performance & Scalability

• AJAX where appropriate
• Optimized queries
• Pagination using LIMIT
• Avoid N+1 queries

🔄 Workflow Summary

1. Admin logs in
2. Creates departments
3. Creates staff + contract
4. Dashboard auto-updates stats
5. Contract nearing end shows alert
6. Staff resigns → contract ends
7. Staff re-onboards → new contract created

🏗 Architecture Expectations

Prefer:

• MVC structure
• Reusable components
• Separate config file
• Clean folder structure:

/config
/controllers
/models
/views
/uploads
/assets

🎯 Final Goal

Build a scientific, logical, efficient HRM workflow system that:

• Improves HR management efficiency
• Keeps historical contract data
• Is scalable and maintainable
• Looks professional like a SaaS product
• Is production-ready