From SaaS Subscriptions to an Internal Business OS

The first replacement was the hardest, because nothing existed yet. Before building any feature, the team had to set up everything a SaaS vendor normally handles behind the scenes: hosting, automatic backups, security, a tech stack, a database, user accounts with access rights, and a backlog to plan the work. An experienced developer designed the architecture and set the rules for testing, deployment and monitoring. Every change now passes several checks before it reaches production. The first module on this base was an internal team messenger with channels, threads and direct messages, which replaced Slack for internal communication. Most of the two weeks went into the foundation, not the messenger itself.

Tasks turned out to be close relatives of tickets: both have an owner, a status and a discussion thread. So the team didn't build a task manager from scratch. It refactored the messaging and tickets modules to add Tasks and Projects, plus a Kanban view. Tasks now link directly to orders, clients and conversations. The full history sits in the client's own database with no time limit. The client can finally analyze how fast the team processes orders and requests, which was the question that triggered the move.

Every replacement leaves reusable layers behind: accounts, permissions, notifications, email and the deployment process. A new module only needs its own logic. By the client's estimate, the second tool takes about 30% of the first one's effort, and the third takes less than 10%. The client picks the next candidate with a simple rule: whatever is most annoying and easiest to replace. Tools with a real advantage of their own, such as payment systems or large data providers, stay.