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Custom SaaS development
From idea to a SaaS built to grow
We design and develop your SaaS end to end: multi-tenant architecture, subscription management, dashboards, API. From MVP to a version that handles real load, with no rewrite in between.
Launch my SaaS
Have a SaaS idea?
The SaaS (Software as a Service) model turns your solution into a monthly or annual subscription. No install at the client's end, everything runs in the browser, and updates land at the same time for everyone.
We build the back-office you'd expect from a 2026 SaaS: account creation, organisation management, roles and permissions, recurring Stripe billing, dashboards, API for third-party integrations. No need to stitch ten tools together, we start from a consistent base.
We deliver iteratively: we ship an MVP quickly to test the idea against the market, then grow the product based on real user feedback. More useful than spending six months polishing in the dark.
We start with project scoping to frame the MVP scope, figure out which modules add value from v1 and which can wait. Scoping gives you a number you can hold us to, not a figure that doubles mid-project.
Our fully remote team works with software vendors across France, remote for the build and on site for product workshops when it helps the scoping. If your app already exists as a desktop or single-seat version, we can also modernise it rather than starting from scratch.
Use cases
With custom SaaS development, you control your product, your data and your user experience.
API
Communicate via API
with your internal tools or partners.
Stripe
Integrate Stripe payments and subscriptions
Smooth and automated billing.
Clients
Offer a complete client portal
Dynamic dashboards, multi-role access.
React.Django.Next JS.Sanity.Node.js.FastAPI.Directus.React.Django.Next JS.Sanity.Node.js.FastAPI.Directus.React.Django.Next JS.Sanity.Node.js.FastAPI.Directus.React.Django.Next JS.Sanity.Node.js.FastAPI.Directus.
React.Django.Next JS.Sanity.Node.js.FastAPI.Directus.React.Django.Next JS.Sanity.Node.js.FastAPI.Directus.React.Django.Next JS.Sanity.Node.js.FastAPI.Directus.React.Django.Next JS.Sanity.Node.js.FastAPI.Directus.
Case studies.
SaaS solutions adapted to each context
STARTUP
A fintech startup wants to launch a cash management platform for SMEs.
A SaaS with Open Banking connection, forecasting dashboards, automated alerts and accounting integration.
INSTITUTION
A ministry wants to offer a grant tracking portal for local authorities.
A secure SaaS platform with case management, validation workflows, reporting and government SSO authentication.
SME
An HR software vendor wants to transform their desktop application into a cloud solution.
Migration to a multi-tenant SaaS architecture with Stripe subscriptions, customer portal and API for third-party integrations.
ASSOCIATION
A sports federation wants to digitize license and competition management.
A SaaS with club portal, online registration, member management, event calendar and real-time results.
Client cases.
Concrete projects Dorima delivered on this service.
SaaS for energy monitoring and simulation
Solene
Allow users to monitor their energy spending and simulate the production of photovoltaic solar projects to optimise their consumption.
DjangoDjango Rest FrameworkReact
Read more →
Rebuild of a scientific business SaaS
Genomax
Rebuild the genomic sequencing application to make it more accessible and add productivity features for scientists.
DjangoDjango Rest FrameworkReactJS
Read more →Commitments.
What we hold to, from the MVP to the version that takes real load.
Tenant isolation
Pool, bridge or silo: the isolation level is settled before the first line of code.
Billing that runs itself
The subscription cycle runs on Stripe, with its customer portal reachable from your app.
A number you can hold us to
Scoping sets the range, €30k to €60k for a B2B MVP, not a figure that doubles mid-project.
Your code, your repository
We push to your repo from day one. No Dorima-locked layer, no captive licence.
Ready for the auditor
Architecture aligned with your certification target, controls documented for your CISO.
Releases that don't break
The automated test suite is in place from the start, not the day production goes down.
Scaling decided upfront
Auto-scaling and database replication are settled at architecture time, not when traffic spikes.
Readable contracting
Fixed price on scoped phases, then time-and-materials with a monthly day quota.
Projects.
Concrete custom development achievements
+ 150 projects delivered+ 10 years of experience
See all projects
Identify levers to strengthen farm autonomy
An extranet to centralize all information and documentary resources
Offer a mortgage simulation that matches real lending conditions
Provide tools to master energy consumption
Carry out genomic sequencing projects
Identify levers to strengthen farm autonomy
An extranet to centralize all information and documentary resources
Offer a mortgage simulation that matches real lending conditions
Provide tools to master energy consumption
Carry out genomic sequencing projects
Identify levers to strengthen farm autonomy
An extranet to centralize all information and documentary resources
Offer a mortgage simulation that matches real lending conditions
Provide tools to master energy consumption
Carry out genomic sequencing projects
Our approach.
How we build a SaaS that holds up past the MVP stage.
A single instance of the app serves all your clients, with strict data isolation per organisation. We decide together on the level of isolation (logical via a tenant_id, or physical via a dedicated schema) based on your industry: a SaaS in health or finance doesn't face the same constraints as a general productivity tool. The choice happens during the software architecture phase, before the first line of code.
We plug Stripe into the full cycle: multiple plans, trial periods, upgrades/downgrades, expired card handling, payment retries. The Stripe customer portal is directly accessible from your app, which saves you from building a full billing self-service in-house. Stripe webhooks feed your internal dashboards through a dedicated API.
We deploy on AWS, GCP or Vercel depending on context, with auto-scaling on the app layer and a database that can be replicated. In practice, scaling is prepared at architecture time, not the day traffic explodes. We set up a solid automated test suite from the start so deployments don't break production.
A SaaS MVP with authentication, Stripe billing and two or three business modules starts between €30k and €60k. A full product with multi-tenant, public API, analytics dashboards and third-party integrations sits between €80k and €200k. Upfront scoping lets us break the scope down into priorities using the MoSCoW method so the budget stays tight without dropping the features that carry the value.
For an MVP in production with paying early adopters, expect 3 to 5 months. We ship a first usable version in 4 to 8 weeks so your early users can start paying for it. We then extend the product on the back of their feedback rather than assumptions, which avoids building features that end up in the graveyard.
No-code saves time on early prototypes but hits a ceiling on performance, customisation and vendor independence. A custom-built SaaS costs more upfront, but you own it, the stack fits your business, and infrastructure costs stay linear instead of spiking with your row count. The right call as soon as the product carries a serious share of your revenue.
Benefits.
What you get with a custom-built SaaS.
A custom SaaS means predictable recurring revenue first. It also means a product you fully control — the roadmap, the pricing, the integrations, the terms of service.
Compared to no-code or template-based solutions, a custom SaaS doesn't hit a ceiling on cases the base tool can't handle. When your business has a specific rule, we write it; when a client needs an integration, we add it.
On the technical side, the architecture is built to carry you smoothly from your first ten users to your ten thousandth, without a rewrite midway.
What a custom SaaS gives you, in practice:
An app available 24/7 from any browser
End-to-end recurring billing handled by Stripe
Multi-user management with roles configurable per client
An infrastructure that absorbs growth without rebuilding
Dashboards tracking MRR, churn and LTV over time
An interface that stays usable on mobile and tablet
Frequently asked questions.
What clients ask us most often before launching a SaaS.
B2B MVP (one tenant model, one or two integrations, web UI): €30,000–€60,000. Full B2B SaaS product (multi-tenant, billing, SSO, admin, observability): €80,000–€200,000. The initial scoping gives you a number you can hold us to, not a figure that doubles mid-project.
Between 4 and 8 weeks after kick-off for a B2B MVP with authentication, one tenant model, and the main usage scenario. The condition: a clean scoping phase, which rarely takes more than a week.
By isolation requirement and customer profile. Healthcare or finance customers typically require silo (database per tenant). SMB SaaS usually starts in pool (shared database, tenant_id column). Bridge fits regulated industries that need physical separation per region.
Backend: Django, FastAPI, Node.js (NestJS) — chosen by team familiarity and use case. Frontend: Next.js, React, TypeScript. Database: PostgreSQL with row-level security for tenant isolation when relevant. Hosting: AWS, Scaleway, Vercel, or your existing cloud.
You do. Every line. We push to your repository from day one. There's no Dorima-locked layer, no captive licence. If you decide to bring it all in-house in 18 months, we document, train and walk away.
We deliver an architecture compatible with the certification target, document the controls, and work with your CISO or compliance lead. We don't issue the certificate ourselves.
Fixed price for scoped phases (scoping, MVP, clearly specified modules). Time-and-materials for ongoing evolution post-launch, with a monthly day quota and short sprints.
Ready to get started?
From scoping to prototype, to AI integration.
We support your business software projects from start to finish.