Custom Logistics, Fleet & Last-Mile Delivery Management Software: Architecture, GPS Telemetry, and Build Costs

Why Logistics & Distribution Margins Live or Die by Dispatch Software

For courier networks, wholesale FMCG distributors, fuel/gas transporters, construction material suppliers, and field-service fleets, two operational leaks quietly drain up to 22% of net profit: unoptimized route dispatch (and unauthorized vehicle detours/fuel siphonage) and disputed paper delivery notes (PODs) that delay customer invoice settlement by weeks.

When fleets try to rent off-the-shelf Western delivery SaaS tools, they get hit with $25 to $55 per driver per month—which quickly exceeds $30,000/year for an 80-vehicle fleet—while the software still fails to support local cash-on-delivery (COD) M-Pesa STK Push collection, multi-drop wholesale manifest splitting, or offline 3G rural checkpoints. At devManue Systems Engineering, we build custom, zero-per-driver-fee logistics and fleet management platforms tailored to your exact physical operations.

1. Custom Logistics Platform Modules & Fixed-Price Build Breakdown

A production fleet and last-mile delivery platform combines a central web command center for dispatchers with an offline-first mobile Progressive Web App (PWA) or Android app for drivers:

2. Eliminating Fraudulent "Completed Deliveries" & Cash-on-Delivery Leakage

In manual or basic delivery setups, drivers sometimes mark a package as "Delivered" while still 3 kilometers away, or collect cash from a wholesale buyer and delay remitting it for days. We eliminate both problems deterministically in software:

1. PostGIS Geofence Enforcement: The driver's app will not unlock the "Complete Drop" button unless the device's GPS coordinates are within 150 meters of the customer's pinned delivery coordinates (or a supervisor issues an audited override code).
2. Zero-Cash M-Pesa STK Push on the Doorstep: For Cash-on-Delivery orders, the driver taps "Request Payment" on their screen, triggering an M-Pesa STK Push directly to the recipient's phone. The digital Proof-of-Delivery OTP only unlocks once the payment webhook settles in your database—eliminating physical cash handling completely.

# Geofence-Verified & OTP-Locked Proof of Delivery (POD) Handler in Django + PostGIS
import math
from django.db import transaction
from django.core.exceptions import PermissionDenied
from django.utils import timezone
from .models import DeliveryStop, Invoice

def haversine_meters(lat1: float, lon1: float, lat2: float, lon2: float) -> float:
    R = 6371000.0
    phi1, phi2 = math.radians(lat1), math.radians(lat2)
    dphi = math.radians(lat2 - lat1)
    dlambda = math.radians(lon2 - lon1)
    a = math.sin(dphi / 2) ** 2 + math.cos(phi1) * math.cos(phi2) * math.sin(dlambda / 2) ** 2
    return 2 * R * math.atan2(math.sqrt(a), math.sqrt(1 - a))

@transaction.atomic
def complete_delivery_stop(stop_id: int, driver_lat: float, driver_lon: float, customer_otp: str) -> DeliveryStop:
    stop = DeliveryStop.objects.select_for_update().select_related("order__invoice").get(id=stop_id)

    distance_m = haversine_meters(driver_lat, driver_lon, stop.destination_lat, stop.destination_lon)
    if distance_m > 200.0 and not stop.supervisor_geofence_override:
        raise PermissionDenied(f"GPS check failed: Driver is {distance_m:.0f}m away from delivery point (max 200m).")

    if stop.recipient_otp_code != customer_otp.strip():
        raise PermissionDenied("Invalid recipient OTP code.")

    if stop.order.is_cod and stop.order.invoice.status != "PAID":
        raise PermissionDenied("Cash-on-Delivery invoice must be settled via M-Pesa before releasing goods.")

    stop.status = "DELIVERED"
    stop.delivered_at = timezone.now()
    stop.verified_lat = driver_lat
    stop.verified_lon = driver_lon
    stop.save(update_fields=["status", "delivered_at", "verified_lat", "verified_lon"])
    return stop

Managing a growing vehicle fleet or distribution network? Calculate your infrastructure savings with our Cloud & SaaS ROI Calculator or book a Logistics Architecture Discovery Session.

3. Frequently Asked Questions (FAQ)