AriesDevs engineering team Engineering notes
7 min read
Building software-as-a-service is different from building a one-off application. You are creating a product that many customers share, pay for monthly and expect to improve continuously. A repeatable process keeps that complexity under control. This is the sequence we recommend.
Step 1: validate the problem
Talk to potential customers before writing code. Confirm that the problem is painful, that they already spend money or time solving it, and that you can reach them. A landing page with a waiting list or a few paid pilots is a stronger signal than a survey.
Step 2: plan the foundations
- Multi-tenancy: how customer data is separated. A shared database with strict tenant checks is the usual starting point.
- Authentication and roles: sign-in, teams, invitations and permissions.
- Billing: subscriptions, trials, invoices and tax handled through a provider such as Stripe, not built by hand.
- Observability: logging, error tracking and uptime monitoring from day one.
Step 3: design the core journey
Design the path from sign-up to the first moment of value, and make it short. Prototype it, test it with five users and fix what confuses them. Onboarding is where most SaaS products lose customers.
Step 4: build in small releases
Work in two-week sprints with a working demo at the end of each. Use automated tests for billing, permissions and anything that handles customer data, and review every change. Keep a staging environment that mirrors production.
Step 5: harden before you launch
- Security review: access control, input validation, dependency updates and secret management.
- Backups and a rehearsed restore.
- Performance testing for the pages and API calls that matter.
- Legal basics: privacy policy, terms and data-processing terms for business customers.
Step 6: launch, learn and iterate
Release to a small group first, watch how they use it and fix what breaks. Track activation (people who reach first value), retention and support requests, and let those numbers set the next sprint. After launch, plan for steady improvement rather than a big second release.
How long and how much?
A focused first version typically takes three to five months. Cost depends on scope and the number of integrations, so treat any early figure as a range until the first release is defined. A short discovery sprint will give you a prioritised scope and a realistic estimate to plan around.
