Java Billing System & Report Writing
Budget: $30 – $250 USD
I am developing a Java-based billing system and my immediate need is rock-solid payment processing. Your task is twofold: first, build the core payment module in clean, well-structured Java; second, document the work in a clear, professional report.
Scope of the build
The application is centred on secure, reliable payment handling—think card transactions, error recovery, and accurate balance updates. While payment processing is the top priority, a design that leaves room for future add-ons such as invoice generation or basic customer records would be ideal. I will supply detailed specs, UI sketches, and any gateway credentials once we get started.
Report requirements
Alongside the code, I need a concise technical report that explains the overall architecture, key classes, data flow, and the tests you ran to prove the module is production ready. Good English, logical structure, and the ability to present diagrams (e.g., UML or simple flowcharts) will be valued.
Deliverables
• Source code (Java 8+ or a later LTS version)
• Build/run instructions (Maven or Gradle preferred)
• Unit tests with clear pass criteria
• Technical report in PDF or DOCX, 5–10 pages
Acceptance
I will sign off once the payment workflow runs end-to-end on my machine and the report accurately reflects the implementation.
Scope of the build
The application is centred on secure, reliable payment handling—think card transactions, error recovery, and accurate balance updates. While payment processing is the top priority, a design that leaves room for future add-ons such as invoice generation or basic customer records would be ideal. I will supply detailed specs, UI sketches, and any gateway credentials once we get started.
Report requirements
Alongside the code, I need a concise technical report that explains the overall architecture, key classes, data flow, and the tests you ran to prove the module is production ready. Good English, logical structure, and the ability to present diagrams (e.g., UML or simple flowcharts) will be valued.
Deliverables
• Source code (Java 8+ or a later LTS version)
• Build/run instructions (Maven or Gradle preferred)
• Unit tests with clear pass criteria
• Technical report in PDF or DOCX, 5–10 pages
Acceptance
I will sign off once the payment workflow runs end-to-end on my machine and the report accurately reflects the implementation.