Lower the total cost of software ownership by retiring the recurring per-seat license fees of the legacy product

Our client is a tour operator specializing in complex, tailor-made trips that combine accommodations, transportation, and activities. For years, the company relied on a licensed legacy platform with a high cost of ownership that no longer met business needs, forcing employees to handle much of their work manually and store critical data in spreadsheets.
The company decided to replace the system with a modern custom solution. AltexSoft joined under a tight deadline -- before the next licensing payment was due -- and delivered ahead of it, using AI-backed spec-driven development to lower the total cost of ownership across the platform's core workflows.
The project involved rebuilding the operational core of a tour business rather than simply replicating the existing system. The overriding goal was to reduce the total cost of ownership: the licensed legacy product carried a high, recurring price tag, and much of the day-to-day work still depended on manual effort. The replacement had to address several challenges at once.
Lower the total cost of software ownership by retiring the recurring per-seat license fees of the legacy product
Cut costs on agent headcount by automating workflows that previously required manual effort
Build a higher-converting platform earlier, so the client starts earning sooner
Taken together, these goals meant the new platform had to reduce ownership costs on the order of several hundred thousand dollars over its lifecycle -- through lower licensing, leaner headcount, and earlier revenue -- while still shipping on an aggressive schedule.
The platform had to support numerous operations and workflows whose behavior varied by user role, itinerary status, traveler configuration, supplier conditions, and other business rules.
Under a traditional development model, implementing a single feature could take anywhere from several days to several weeks. Given the fixed deadline, designing and validating every scenario through this cycle would have made on-time delivery impossible.
To accelerate the project, AltexSoft combined an interactive system simulation with spec-driven development. This enabled the team to verify complex business logic early and translate approved behavior directly into production code.
In one month, a single AltexSoft solution architect built a functional simulator covering approximately 80 platform operations, from adding services and updating traveler details to repricing trips and communicating with suppliers.
For each operation, the simulator defined required data, availability rules, blocking conditions, system-state changes, and impacts on related workflows. Through an interactive interface, the client could test and approve expected behavior before backend and frontend development began.
Representing approximately 68 percent of the platform's functionality, the simulator served as a shared blueprint for requirements, design, development, and testing. This helped minimize rework and gave all project participants a common reference.
Once the core logic was approved, one backend engineer used spec-driven development and AI assistance to turn the simulator into working functionality. The approach shifted much of the effort from writing routine code to creating precise specifications and reviewing implementation quality. This enabled AltexSoft to deliver features about four times faster, shortening development cycles from months to weeks.
We estimate that the new spec-driven development approach helped reduce engineering time by 610 hours compared with traditional development practices, lowering the cost of creating the platform and, in turn, its total cost of ownership.
The faster delivery translates directly into cost savings. By retiring the licensed legacy product ahead of schedule, the client stops paying recurring per-seat license fees sooner, and the reduced engineering time lowers the one-time cost of building the replacement. Combined with the ongoing operating savings from workflow automation, these effects add up to savings in the range of several hundred thousand dollars across the platform's lifecycle.
Beyond cost reduction, the new platform improves the top line. Streamlined, automated booking workflows deliver a smoother experience that yields higher conversion rates than the legacy system. Because spec-driven development shortened time-to-market, the platform reaches production sooner -- so the client begins capturing those improved conversions, and the associated revenue, earlier than a traditional build would have allowed.
Building a custom platform allows the client to move away from the substantial licensing and operating costs associated with a legacy product. The accelerated development approach also lowered the cost of creating the replacement. Instead of scaling the engineering team proportionally to the amount of functionality required, AltexSoft increased the output of a compact cross-functional team. This reduced headcount lowered the cost of ownership by tens of thousands of dollars, cutting labor spend during the build while still meeting the deadline.
The specifications remain part of the project repository and can be reused for implementation, testing, documentation, and future product changes. This creates value beyond the initial release by reducing the effort needed to understand and extend the platform.
In total, the team designed and delivered the most critical workflows in approximately five weeks, from building the simulator to transferring the approved logic into production -- completing the work ahead of the deadline and before the next licensing payment fell due. The core team consisted of one solution architect, one backend engineer, one QA automation engineer, and one manual QA specialist.
The remaining platform functionality was developed with the support of one additional backend engineer and one frontend engineer.
The technology stack included OpenSpec, .NET, C#, PostgreSQL, AWS, and .NET Aspire.