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Custom software for b2b saas.

B2B SaaS vendors in growth: client portal, automated onboarding, recurring billing, usage telemetry, multi-tenant architecture. Typically the moment when the product team hits the limits of no-code solutions and must move to custom without blowing the budget.

01What we solve

Three recurring problems.
The same in most firms.

Before talking software, we talk pain points. If you don't recognize any of these three, we are probably not the right partner for you.

  • 01

    No-code hits its ceiling

    Bubble, Webflow, Airtable, Make: excellent to validate an idea, unmanageable past 50 paying users. You end up coding business logic in Make formulas, praying it holds.

    No-code ceiling reached around 50-100 paying customers

  • 02

    Billing with proration is a nightmare

    Stripe Billing does a lot, but real cases (mid-cycle upgrade, credits, partial refunds, multi-currency) quickly get complex. Billing bugs = guaranteed churn.

    Billing bugs = top 3 causes of B2B churn

  • 03

    Onboarding breaks conversion

    Without automation, every new client demands 2-5 hours of manual onboarding from your success team. You can't scale; each customer costs more to acquire than they bring in the first year.

    2-5 hours of support per manual onboarding

02Complex or critical software

The systems that
cannot fail.

When your processes require a replayable audit trail, sagas with compensation, or compliance by construction, we ship an event-driven architecture (DDD + CQRS + Event Sourcing), not a CRUD layered with audit logs.

  • Per-customer isolated architecture (SOC 2 / ISO 27001 / NIS2)

    Per-customer isolated architecture (SOC 2 / ISO 27001 / NIS2)

    Strict per-customer isolation (separate database or workspace), tamper-proof access history, automated GDPR DPA exports. Designed to pass SOC 2 Type II, ISO 27001 and NIS2 from the first review, NIS2 has been applicable since 17 October 2024 for critical SaaS vendors (cloud, datacenter, managed services). Pass enterprise security reviews without hacks.

    SOC 2ISO 27001NIS2AWSGCP
  • EU AI Act articles 8-15 (high-risk AI features)

    EU AI Act articles 8-15 (high-risk AI features)

    For any SaaS embedding high-risk AI: every AI output is kept with its reasoning, the model, the score and the inputs. Compliant with EU AI Act obligations applicable on 2 August 2026, 5-year history for regulator audit.

    EU AI ActStructured logs
  • Billing cycle with proration and recovery

    Billing cycle with proration and recovery

    Full Upgrade / Downgrade / Refund / Credit cycle with clean recovery on Stripe or Chargebee error. No customer can be billed twice, none can slip through the cracks, drastically reduces churn linked to billing bugs.

    StripeChargebeeRecurly
  • Self-service GDPR replayable

    Self-service GDPR replayable

    Right of access, rectification, erasure and portability per end-user or customer DPO. Every GDPR request is end-to-end traced, tamper-proof, evidence admissible to the CNIL in case of complaint. Responses guaranteed within legal deadlines.

    GDPRDPA
03Mobile and web applications

The day-to-day apps,
screen by screen.

For everything else (CRM, portals, scheduling, billing), we ship a custom application, on your design system and with your existing integrations.

  • Client portal with enterprise SSO

    Client portal with enterprise SSO

    Google / Microsoft / SAML authentication (enterprise SSO), fine-grained per-role permissions (admin, manager, viewer), team workspace with invitations, per-module permission management. Modern UX.

    Google WorkspaceMicrosoft 365OktaWorkOS
  • Automated onboarding

    Automated onboarding

    Configurable multi-step onboarding flow, self-service checklist, contextual videos, automated success-team booking based on progression. Visible time-to-value metric.

    CalendlyLoomUserlist
  • Usage telemetry and analytics

    Usage telemetry and analytics

    Tracking usage per customer / per user / per feature. Identification of power users, under-used features, churn signals. Cohort comparison.

    SegmentAmplitudeMixpanel
  • Status page and SLA

    Status page and SLA

    Public status page, self-declared monitoring, per-customer SLA tracking, structured incident communication. Essential to win enterprise customers.

    StatuspageBetter Uptime
04Regulations & integrations

What we handle natively,
no add-ons.

Business compliance and key integrations are not options, they are prerequisites built in from the start.

  • GDPR

    Customer DPA signed, right of access and portability

  • VAT OSS

    EU VAT one-stop-shop for B2C sales

  • SOC 2 / ISO 27001

    Security, often required by enterprise

  • EU AI Act

    If AI features, applicable 2 August 2026

  • DPA / SCC

    Non-EU transfers, standard contractual clauses

  • WCAG 2.1 AA accessibility

    If public-sector customers

05Frequently asked questions

Answers to the questions we get in meetings.

We already use Stripe / Chargebee, do you replace them?
No. Stripe and Chargebee are excellent billing back-ends. We orchestrate on top to handle business logic (plans with custom quotas, specific proration, accounting integrations).
Do you help us migrate from Bubble / Webflow to custom?
Yes, that's one of our typical cases. Progressive migration: we replace the critical modules (auth, billing, multi-tenant) then add missing functions. No big bang.
Is the multi-tenant architecture solid for enterprise customers?
Yes. DB or schema isolation depending on your constraints, per-tenant audit logs, automated GDPR exports, SOC 2 / ISO 27001 reachable. Designed to pass enterprise security reviews.
How much does it cost for a Series-A B2B SaaS?
€60-150k initial (SSO portal + advanced billing + telemetry + multi-tenant), €10-20k/year maintenance. Compare with an internal team of 2-3 devs over 6 months (€300-500k).
Is the code ours?
Yes. IP transferred at delivery or perpetual licence. Reversible hosting (AWS, GCP, DigitalOcean). No Swoft lock-in.
06Related industries

On the boundary?

Mixed firms (accounting + audit, accounting + advisory, accounting + legal) draw from several industries. Here are those that share the most challenges.

07Articles & veille

L'actualité B2B SaaS, décryptée.

Réglementations, virages business, sous-domaines en mutation : ce que notre pôle veille publie sur le secteur B2B SaaS.

  • NIS2 for SaaS vendors: six months to pass the audit
    Salle serveur d'un éditeur SaaS avec consoles de supervision sécurité

    NIS2 for SaaS vendors: six months to pass the audit

    Applicable since October 2024, the NIS2 directive starts to bite in 2026. SaaS vendors classified as "important entities" face new technical obligations.

Tous les articles B2B SaaS →
Glossaire connexe

Le cadre réglementaire qui structure B2B SaaS.

Les réglementations qui pèsent sur les choix logiciels (appliquées, partielles, ou imminentes), décryptées par notre pôle veille.

  • Network and Information Security 2, Directive (UE) 2022/2555
    In force

    NIS2

    Network and Information Security 2, Directive (UE) 2022/2555

    Directive cybersécurité européenne applicable depuis octobre 2024. Élargit le périmètre aux SaaS, datacenters, transporteurs, alimentaire.

    • B2B SaaS
    • Banking
    • Clinic & Health
    • +3
  • Règlement (UE) 2024/1689 sur l'intelligence artificielle
    Partially in force

    EU AI Act

    Règlement (UE) 2024/1689 sur l'intelligence artificielle

    Premier cadre horizontal mondial de régulation de l'IA. Obligations IA haut risque applicables le 2 août 2026.

    • B2B SaaS
    • Banking
    • Defense
    • +1
Tout le glossaire réglementaire →

A B2B SaaS coming out of no-code?
30 minutes, no sales pitch.

30 minutes to scope the migration from your current stack and price the project for your stage.

Talk about a SaaS project