Job Description

Roles & Responsibilities

## � Freelance or Inhouse Developer Needed — Cargo Load Optimizer (SaaS Web App)

*Project type:* Web application (SaaS)

*Stack:* Python (FastAPI) + React + PostgreSQL + Three.js

*Timeline:* 3–4 months

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### About the Project

I am building a web-based cargo load optimizer for logistics and transport professionals. The app allows users to import cargo dimensions from an Excel/CSV template, define their own custom truck dimensions, and receive an optimized 3D loading plan showing how to fit the cargo inside the truck.

The app will be sold as a monthly subscription (via Stripe) so the code must be clean, scalable, and maintainable.

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### Core Features to Build

*1. User Accounts & Subscriptions*

• Registration, login, password reset (via Supabase or similar)

• Stripe integration for monthly subscription billing

• Free trial or freemium tier (TBD)

*2. Custom Truck Profiles*

• Each user can create and save multiple truck configurations

• Fields: internal length, width, height, max payload weight, axle limits (optional)

• CRUD interface to manage saved truck profiles

*3. Cargo Import*

• Upload Excel (.xlsx) or CSV file with cargo dimensions

• Template provided (columns: item name, length, width, height, weight, quantity, stackable yes/no)

• Validation and error handling for bad data

*4. 3D Bin Packing Algorithm*

• Fit cargo items into the selected truck using an efficient 3D bin packing algorithm

• Respect stackability rules, weight limits, and item orientation options

• Return a loading order and placement coordinates for each item

*5. 3D Visualization*

• Interactive 3D view of the loaded truck (Three.js or similar)

• Each cargo item displayed as a colored box with label

• Rotate/zoom the view

• Show utilization percentage (volume and weight)

*6. Loading Plan Export*

• Export the loading plan as PDF or printable view

• Summary: total items, total weight, space used (%)

  
  

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### What I Will Provide

• Full feature specification document

• Excel import template design

• UI wireframes (in progress)

• Feedback and testing throughout the project

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### How to Apply

Please send me:

1. Your relevant experience (algorithms, SaaS apps, logistics if any)

2. 1–2 examples of similar projects

3. Your proposed approach to the 3D bin packing problem

4. Your availability and rate

Candidates who address the bin packing approach specifically will be prioritised — this is the technical heart of the project.

Desired Candidate Profile

### What I Am Looking For

• Strong experience with *Python backend development* (FastAPI or Django REST)

• Experience with *React* for frontend

• Experience (or strong interest) in *3D bin packing algorithms*

• *Three.js* or similar 3D web visualization experience is a big plus

• Experience with *Stripe* integration

• Clean, documented code — I am learning to code and will need to maintain this

• Good communication in English or French