Custom B2B SaaS development

What does custom SaaS development involve?

Internal software serves a single organisation; a B2B SaaS product must serve several without mixing their data. You need to define who can create an account, who invites colleagues, what permissions each person has, and how a company can leave the service with its own data. Custom SaaS development therefore starts with questions of organisation and journey, before the list of business features. A login page bolted onto an internal tool doesn't solve any of this.

You also need to plan what the team operating the product can see and do: help a user, understand an error, check an invoice, act without improper access to a customer's data. Monitoring, backups and a tested restore process belong to this foundation. The scope of the first version should stay manageable, but these foundational decisions can't be pushed back as mere finishing touches.

• Organisations, invitations and roles
• Subscriptions, invoices and internal administration
• Monitoring, backups and data export

Custom B2B SaaS development: from business need to product

Before building, we try to understand who buys the software, who uses it, and for what value. The person who pays isn't always the person entering the data. The journeys need to work for both. We look at what's shared between customers and what must stay isolated, then at how roles and permissions will evolve. This step protects your idea from a common trap: shipping something useful to a first company but hard to offer to the next ones.

An existing internal tool can serve as a starting point. Its business rules may already be well understood, but turning it into a SaaS product requires examining access, data separation, subscriptions and support. Conversely, if what you really need is a tool for your own team, custom business software may be more appropriate. Our role is to tell these paths apart during scoping, not to label every project a SaaS product.

Building a SaaS product: billing, access and operations

A subscription isn't just about taking a payment. Depending on your model, you need to decide the billing unit, plan changes, invoices and how failed payments are handled. Invitations, access resets and sign-in tracking must stay consistent with each company's permissions. We scope these choices with you; we don't assume either your pricing or your sector's specific obligations without examining them.

On the operations side, you need to be able to detect an error, know whether a job is pending, check a backup, and restore the service. An internal administration area helps diagnose issues without improvising production access. We also look at per-customer running cost and the ability to export their data. A credible SaaS shouldn't keep its users captive because their data is locked in. These topics are less visible than a sales screen, but they matter over time.

How does our SaaS development studio work?

The work starts with a day on site with the people involved in the product and its use. We write down the rules, roles, exceptions and data, then produce a scoping document that stays yours, even without further work together. The quote is based on this scope. For a SaaS product, this means describing both the business served and the life of the product itself: sign-up, access, billing, support, export and day-to-day operation.

A usable version arrives early so the product can be tested against real journeys. Feedback is used to reorder features not yet built. If the project starts from an existing tool, data quality and migration are examined at the start. Going live includes training, documentation, monitoring and backups with a tested restore. We remain the same point of contact from scoping through to future improvements. Based in Lille, we work across France, on site for scoping and remotely for building.

1. Scope the business need and the service model
2. Define the foundation and examine the data
3. Test an early usable version
4. Train, operate and keep improving

Trackary, our own B2B SaaS product

THE LEVEL CODE publishes Trackary, a web and mobile CMMS for construction equipment fleets. Its mobile app works offline. Designing and running our own product makes the questions of customer journey, data, maintenance and day-to-day operation very concrete. The Trackary case study page describes its scope. Trackary is proof of our product work, not a template we copy for your business. Your software must answer to its own users and its own way of going to market.

We don't take a stake in the SaaS products we build for you. We're paid for scoping and development; the product and its code belong to you. The code is on your repository from the first commit, and third-party accounts are in your name. There's no licence to pay us to keep using it, and no exit fees. This clear separation lets you choose who will run operations and future improvements.

What budget for a SaaS development agency?

Budget depends on the business to cover, the number of roles, subscription journeys, integrations with other tools, data migration, and operational needs. A product with an offline field app adds decisions about sync and conflicts. We don't give a generic figure: scoping, billed separately, produces a scope and a quote you can discuss. Our guide on the price of custom software details the cost factors.

Timeline doesn't follow from a number of screens either. An early version can be tried before the whole product is built, but going live requires checking access, data and operating conditions. A SaaS development agency should explain what goes into the first version and what will wait, rather than promising a complete product after a short conversation. If existing software needs to be taken over, the audit comes before this estimate.