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## Freelance Developer Needed — Cargo Load Optimizer (SaaS Web App) *Project type:* Web application (SaaS) *Stack:* Python (FastAPI) + React + PostgreSQL + [login to view URL] *Budget:* ~6,000 EUR *Timeline:* 3–4 months *Location:* Remote (EU timezone preferred) --- ### 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. --- ### 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 ([login to view URL] 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 (%) --- ### 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* - *[login to view URL]* 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 --- ### What I Will Provide - Full feature specification document - Excel import template design - UI wireframes (in progress) - Feedback and testing throughout the project --- ### 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
Project ID: 40459584
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80 freelancers are bidding on average €7,078 EUR for this job

A Warm Hello! We are readily available to start working on this project! We would be excited to collaborate on the Cargo Load Optimizer and help turn it into a scalable, production-ready SaaS application. It combines several challenging and high-value areas: SaaS architecture, logistics optimization, algorithmic problem solving, and real-time 3D visualization. This is exactly the type of technically meaningful platform our team enjoys building. Our Understanding of the Project The platform needs to: - Allow users to upload cargo data via Excel/CSV - Store and manage custom truck profiles - Run an intelligent 3D cargo placement algorithm - Visualize the result interactively in 3D - Generate printable/exportable loading plans - Operate as a subscription-based SaaS platform We’d love to review the specification document and wireframes once available and discuss the optimization logic in more detail. Looking forward to connecting. Best regards, Ana
€7,500 EUR in 50 days
10.0
10.0

Hi - Elias here from Miami. The main challenge in developing a 3D bin packing algorithm is efficiently optimizing space while managing constraints like weight distribution and cargo dimensions. Poor designs can lead to suboptimal packing, resulting in wasted space and increased costs. Common pitfalls include overlooking edge cases, such as irregularly shaped items, and naive implementations that suffer from high computational complexity, leading to performance issues under load. A modular architecture that can easily adapt to various packing configurations is essential for scalability. I propose a hybrid approach that combines heuristic algorithms with optimization techniques, allowing for real-time adjustments based on user input. The workflow would involve inputting cargo dimensions and constraints, processing them through the algorithm, and visualizing the solution in 3D. This ensures users can iterate quickly and see immediate results. A critical risk to address early is selecting data structures that handle concurrent requests efficiently to avoid bottlenecks as user load increases. What specific constraints should the algorithm prioritize to meet your operational needs? Looking forward to discussing this further.
€7,500 EUR in 26 days
8.4
8.4

Hi, this is exactly the kind of SaaS where my mix of backend, frontend and algorithm work fits well. I have solid experience with Python FastAPI, React, PostgreSQL and Stripe based subscriptions, and I have built logistics style optimizers before, including container and pallet loading tools with 3D views in Three JS. One example is a warehouse slotting and carton filling planner, another is a vehicle routing dashboard with capacity constraints, both delivered as subscription web apps with clean, documented code for non expert maintainers. For the 3D bin packing I would implement a heuristic approach rather than pure academic optimisation, for example a layered first fit decreasing strategy that sorts items by size and weight, respects stackability flags and orientation options, and fills the truck in stable layers while tracking payload and simple axle constraints. The algorithm would output exact coordinates and a loading order, which we then render in Three JS with an interactive truck view and utilisation metrics. I can work in an EU friendly timezone, commit to roughly three to four months, and propose a fixed price in the six thousand euro range once I review your spec document.
€7,500 EUR in 7 days
4.9
4.9

Lets chat, a free consultation and no obligation. I understand you need a clean, professional, and user-friendly solution for your "3D Bin Packing Algorithm Development" project. My skills in PHP, Java, JavaScript are a perfect fit for this project. While I am new to freelancer.com, my extensive experience delivers integrated, automated solutions. Regards, Jason McLachlan
€7,491 EUR in 3 days
1.4
1.4

Dordrecht, Netherlands
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