Your applications, designed, custom-built
From scoping to launch. Modern stack (Next.js, TypeScript, Supabase, PostgreSQL) with AI integrated only when it delivers measurable value.
One team.
From scoping to delivery.
Three concrete commitments that shape how we deliver, from the first workshop to production deployment.
One team, from the first workshop to support
Scoping, design, development, deployment. The developer who engages with your business team during scoping is the one who writes the code.
Production-grade code, not a disguised AI prototype
AI speeds up our prototyping, but what goes into production is reviewed, tested, monitored, and maintainable code for your teams.
Modern stack, technical debt under control
Next.js, strict TypeScript, PostgreSQL, automated tests, human oversight, and end-to-end validation.
Four application families.
One dedicated page per use case.
Four formats we design and deliver regularly. Click to explore our approaches, client cases, and the tailored method for each.
Looking for an editorial site or a multi-country CMS? View Websites & CMS.
Business tool
Custom ERP, back-office, or internal management platform. When existing solutions (Excel, no-code, generic SaaS) no longer suffice.
View business toolSales enablement tool
Configurators, dynamic quotes, commercial portals, simulators. For field teams.
View sales enablement toolSaaS
Multi-tenant B2B product, billing, onboarding, RBAC. From MVP to scale, with an architecture built to handle the load.
View SaaSMarketplace
Matching, split payments, moderation, dual registration. Stripe Connect, MangoPay—proven integrations.
View marketplaceHave another application idea? Let’s discuss. A single conversation is enough to assess the project and outline next steps.
A modern stack
for custom applications.
We tailor our stack to the client context (sovereignty, GDPR, existing in-house teams, SI integrations).
From Airtable to a custom application.
Gradual migration to Next.js + Supabase, with the old system coexisting until full switch. Zero business disruption.
Read the case studyA project
No handoffs between scoping, build, and run. The same engineers support you from the first workshop to maintenance, so knowledge isn’t lost along the way.
Spec, plan, estimate.
Business workshop, use case mapping, constraints (IT systems, GDPR, security), quantified success criteria. Deliverable: functional spec + technical plan + fixed estimate.
Parcours validés.
Wireframes, user journeys, design system, mockups. Full validation before any code is written.
Sprints de 2 semaines.
Demo at the end of each sprint. Your IT teams involved from sprint 1 — code reviews, pair programming if requested.
Bascule sécurisée.
Load testing, security audit, rollout plan, team training. No Go Live without measurable quality criteria.
Maintenance ou transfert.
Corrective maintenance, updates, gradual handover to internal teams if desired. Our goal is not to become indispensable to your operations.
Frequently asked questions
The questions we hear most often during scoping. If yours isn’t here, get in touch!
An idea, a business need, or an existing project to take over?
75011 Paris
Resources
Recommended guides
In-depth resources explaining the choices, methods and challenges behind this service.
Custom web application development: the complete guide
Discover custom web application development and learn how to scope your project, budget it, and choose the right solution for your business.
Cost of a web application in 2026: what to budget for?
Web app budget: estimate by project scope, compare cost items and quotes, and plan ongoing expenses. Scroll's custom software starting point.
5 web app examples to inspire you
Looking for web app examples? Scroll breaks it all down
What are the differences between a web application and a website?
Website or web application? Compare uses, examples, PWAs, and practical criteria based on your content, users, and business features.
Proof
Related case studies
Delivered projects showing this expertise in real-world contexts.
Temp agency · Artificial intelligence
How Scroll developed a temp agency platform connected to WhatsApp
Vertical SaaS – fire safety · SaaS
Cindra is a vertical SaaS that digitizes the operations of groups specializing in the installation and maintenance of fire safety equipment.
Healthcare · No-code to code migration
Migrating a hospital RFID system from Bubble to a sovereign stack, without a single service interruption
Explore further
Related services
Complementary expertise for building a coherent delivery path.
Custom business applications
A custom ERP, back office or internal tool connected to your systems, when spreadsheets, no-code or generic SaaS no longer keep up with your business.
Custom B2B SaaS development
Your SaaS product from MVP to scale: onboarding, billing, roles, customer portals and integrations.
Sovereign and reversible applications
Applications designed in France, hosted in France or Europe, with code and data you can take with you.