Build Complete Property Management SaaS + CRM + Marketplace + Field App + HRMS

Full-Stack Property Management, CRM, Marketplace & Field Operations Platform We are looking for an experienced senior full-stack developer or small product engineering team to build a complete, production-grade property management operating system for an Indian real-estate/property-management company. This is not a simple website or admin panel. The requirement is for an integrated SaaS-style platform combining a public property marketplace, CRM, property-management operations, customer portals, field operations, finance workflows and employee/HR functions within a single system. Core Product Scope The system should have four interconnected application surfaces sharing one central backend: 1. Public Website + Property Marketplace SEO-optimized responsive website, city/locality landing pages, Buy/Rent/Lease listings, property search and filters, property detail pages, owner-property submission, tenant requirements, enquiry capture, visit booking, lead/referral intake and customer authentication. 2. Internal Operations / CRM Desktop-first operations system for property acquisition, tenant acquisition, lead management, property onboarding, property master, owner/tenant profiles, visit scheduling, follow-ups, negotiations, agreements, move-in/move-out, inspections, inventory, keys, maintenance, rent collection, vendor management, documents, tasks, SLA/TAT monitoring and complete operational timelines. The CRM must support assignment by employee, department, city and role, with controlled reassignment, audit trails, duplicate detection, workflow/state-machine rules and role-based access. 3. Owner & Tenant Customer Portal Customers should be able to log in and view their properties/tenancy, agreements, payments, rent information, maintenance requests, inspections, documents, visits, approvals, support requests, notifications and action-required items. 4. Mobile-First Field Operations Field executives require a dedicated mobile interface for assigned visits/jobs, GPS-based check-in/out, property inspections, onboarding, photography, inventory verification, meter readings, key handover, move-in/out, maintenance verification, evidence/photos, navigation and job completion. Employee / HRMS The platform should also include a native HR layer linked to the same employee identity system: Employee master and access control Departments/designations/reporting managers Roles and city assignments Shifts and weekly offs Attendance and GPS punch Leave balances, leave requests and approvals Attendance regularization Employee documents Workforce availability Employee self-service “My HR” Manager/team HR dashboard Salary structures Shadow payroll processing Payslips and downloadable PDF salary slips Technical Expectations Preferred modern stack: React 19 + TypeScript + TanStack Start/Router/Query + Vite + Tailwind CSS + shadcn/ui + Supabase/PostgreSQL. The backend should use PostgreSQL with strong Row Level Security (RLS), secure server-side privileged operations, audit logging, role/city-based authorization, object/document storage and API/RPC boundaries. The product must be responsive, premium and highly polished, with the public/customer experience optimized for mobile, the internal operations system optimized for laptop/desktop, and Field Ops optimized for mobile. Integrations Architecture should support integrations such as: WhatsApp/SMS/email notifications MSG91 or similar communication provider Razorpay/payment gateway Google Maps/Places/Geocoding Google Calendar Telephony Accounting integration such as Zoho Books Document/PDF generation OTP authentication All real provider activation should be environment-controlled and secure. Security & Quality Requirements This is a business-critical application. We expect: Proper RBAC and city-level access restrictions Supabase/Postgres RLS Secure server-side privileged operations No secret/service-role keys in frontend code Audit logs Controlled workflow/state transitions Idempotent backend operations where required Automated tests TypeScript/typecheck compliance Production-grade error handling Separate staging and production environments Migration/version discipline Clean Git-based development workflow Expected Freelancer We prefer someone who has previously built large SaaS, ERP, CRM, property-management, logistics, field-service or marketplace platforms, rather than only landing pages or basic CRUD dashboards. Please provide: Similar systems you have built Proposed architecture and technology stack Team size Estimated development timeline Fixed-price or milestone-wise quotation Post-launch warranty/support period Whether UI/UX, backend, DevOps, testing and deployment are included Important: We already understand the required product deeply and can provide detailed workflows, schemas, business rules and reference screens. We are looking for someone capable of implementing the complete system to production quality, not merely creating a prototype.