Locatelog: GPS Attendance & Polygon Geofencing System, Zero Proxy Sign-Ins, Full Audit Trail

GPS attendance app development with polygon geofencing is what field-service organisations search for once they hit this exact wall: for organisations with dozens of distributed field sites, traditional paper attendance registers are trivially bypassed, employees can sign in from anywhere. Manual supervisor verification is expensive, slow, and doesn't scale across multiple geographic divisions. These organisations needed a system that could verify attendance against physical site boundaries in real time, handle multiple parallel workspaces across a geographic hierarchy, manage leave requests with approvals, and give administrators a live operational view.

We built Locatelog as a full-stack Django and React platform running on a polygon boundary engine, not simple radius checks. Its backend models a three-tier geographic hierarchy (Circle, Division, SubDivision) mapping to the client's operational territory structure. The geofencing engine uses a polygon boundary algorithm that instantly validates whether any GPS coordinate falls within a defined site boundary, handling irregular shapes and complex polygons reliably. The mobile check-in system fetches workspace assignments, runs the geofencing check, and creates an attendance record marked in or out of boundary. The same endpoint handles leave submissions. The admin dashboard uses annotated queries to deliver attendance counts in a single database round trip, with a geographic map view filterable by hierarchy level.

Django 5 + DRF API. JWT authentication. PostgreSQL database. Pure Python polygon boundary geofencing engine (no external dependencies). 3-tier geographic hierarchy (Circle → Division → SubDivision). JSONField polygon coordinate storage. Attendance model with 5-type enum and full leave management fields. React + Redux + Material UI dashboard. Mobile API for GPS coordinate submission.