Billing and tax at volume

FinTech & Web3

About

Volume Billing is a Dallas-based SaaS company that handles subscription, usage and device billing, including vehicle subscription billing, for businesses that bill at high volume. Its customers depend on accurate invoices and correct tax across large numbers of accounts, contracts and orders, which makes billing accuracy and speed central to everything the product does.

Client Review

Review

Very good developer. Focused on requirements and also end to end design.

50+ releases

Shipped over 18 months

12 modules

Accounts through to receivables

Angular 12

Upgraded from 9 mid-delivery

Avalara tax

Calculated on every order

1 team

Product owner to production

Challenge

Traditional billing tools could not handle subscription, usage-based and device billing at volume. The result was revenue leakage, manual cross-checking and tax that had to be checked by hand, all of which slowed invoicing and put accuracy at risk. Volume Billing needed one portal covering accounts, contracts, orders, usage and receivables, with tax right on every order and tables the team could change without waiting on developers.

Solution

We owned portal delivery for 18 months, working with Volume Billing’s product owner, architect and backend developer and shipping against their requirement and error documents sprint after sprint.

Discovery & Strategy

Turned each sprint’s requirement and error documents into scoped releases
Chose a server-side Avalara integration after comparing both SDKs
Planned the Angular 9 to 12 upgrade alongside feature work

Design & Engineering

Built 12 portal modules in Angular, connected to the Spring Boot REST APIs
Integrated Avalara tax estimation and post-tax on order creation
Added address validation and moved data to MongoDB Atlas
Built config-driven tables, two-level grouping and quotes with PDF output
Built dark mode and fixed selected-row highlighting in tables

Security & Reliability

Added Keycloak sign-in and record locking against conflicting edits
Fixed a long-standing bug in the third-party table library

The Results

Outcome Summary

Over 18 months and more than 50 releases, Volume Billing kept extending scope with the same team. Billing, tax and receivables moved out of manual cross-checking and into one portal with Avalara tax on every order. The product owner described the work as focused on requirements and end-to-end design.