--- title: "Custom web applications — SwiftUp" description: "We design and build fully custom web applications: dashboards, client portals, internal tools, SaaS platforms. Nothing off-the-shelf — the architecture follows your business logic, the interface stays clear, and scale is handled from the start." canonical: "https://swift-up.com/en/savoir-faire/applications-web" lang: "en" --- # Custom web applications The product that runs your business. Dashboards, client portals, internal tools. Nothing off-the-shelf. [Start a project](https://swift-up.com/en/contact) [See our method](https://swift-up.com/en/methode) Built for - SaaS founders - Companies going digital - Ops & business teams app.your-product.com Your product Signed this month **$26,850** **+10%**vs last month Awaiting signature **$36,700** 3 quotes sent Win rate **57%** 4 signed out of 7 Signed amount Awaiting 3 - $12,400 - $18,900 - $5,400 Draft 2 $26,300 - $4,800 - $21,500 Sent 3 $36,700 - $12,400 - $18,900 - $5,400 Signed 4 $26,850 - $7,250Signed - $3,200Signed - $6,600Signed - Ref. Subject Status - - - - - 1–5 of 9 New quote Illustrative SwiftUp mockup — generic demo interface. **Your turn.** Sign a quote, create one, move it along: every figure follows. Sign a quote, create one: every figure follows. - What we bring - Behind the scenes - Deliverables - The right fit What we bring ## A tool that works the way you do. Off-the-shelf software asks you to adapt to it. A custom application does the opposite: it takes your rules, your roles and your tools, and makes them run together. ### Your rules, not a vendor's. Your steps, your approvals, your exceptions: we write them into the application exactly as you practise them. Nobody has to work around the tool to get their job done. ### Everyone sees what concerns them. Management, team, client: one tool, access tuned precisely for each. - Dashboard - Records - Invoicing - Settings ### Plugged into your tools. Payments, accounting, email, calendar: the application talks to what you already use. No more retyping. ### Your data stays yours. A structured database, backed up, exportable at any time. The source code and the access are handed over to you. ### It grows with you. A new need, a new team, ten times the users: we add a module, we don't start over. Behind the scenes ## What sits under the screen. The interface is only the visible part. An application stands on four layers — we design and build all of them, so they hold together. 1. What your teams see ### Screens, forms, dashboards: drawn for how you work, consistent from the first to the last. - React - Design system 2. What applies your rules ### Calculations, validations, automations, access rights. The brain of the application, written for your business. - TypeScript - API 3. What the application knows ### Clients, records, history: a structured, reliable, backed-up database. - PostgreSQL 4. What keeps it online ### Hosting, security, monitoring. Available and fast, day and night. - Cloud edge - Monitoring Deliverables ## What you get - ### Product framing and user journeys Before the first line of code, we set down in writing what the application does, for whom, and in what order we build it. - ### Interface and design system Every screen designed, plus the component library that keeps the whole coherent as the application grows. - ### Back end, database and API The engine: your data and your business rules, ready to talk to your other tools. - ### Authentication, roles and permissions Secure accounts and finely tuned rights: everyone reaches what concerns them, nothing more. - ### Deployment and documented handover The application live, the source code, the access, the documentation. All handed over to you, and explained. Stack & technologies - TypeScript - React / Astro - Node - PostgreSQL - Cloud edge Indicative — the final stack is chosen to fit your project. The right fit ## Is this the right approach for you? We don't sell the same answer to everyone. Here is when this approach is the right one — and when another will serve you better. ### It's the right approach if… - Your spreadsheets and current tools no longer keep up with your business. - Your business has rules no off-the-shelf software respects. - Several profiles work on the same data, each with their own rights. - You are launching a SaaS product and want to master every detail of it. ### Look instead at… - [Websites if the goal is to be found and to convince, with no accounts or data to manage.](https://swift-up.com/en/savoir-faire/sites-web) - [Cross-platform apps if usage happens first on the phone, in the field or on the move.](https://swift-up.com/en/savoir-faire/apps-cross-platform) Unsure between two approaches? We settle it together, at the framing stage. ## We also build. Same studio, same standards. Only the form changes. - [Websites An online presence that earns trust. Explore](https://swift-up.com/en/savoir-faire/sites-web) - [Native mobile apps The best of iOS and Android. Explore](https://swift-up.com/en/savoir-faire/apps-mobiles-natives) - [Cross-platform apps One codebase, two platforms. Explore](https://swift-up.com/en/savoir-faire/apps-cross-platform) [SwiftUp](https://swift-up.com/en) · [Contact](https://swift-up.com/en/contact) · [Index for AI agents (llms.txt)](https://swift-up.com/llms.txt) · [Sitemap](https://swift-up.com/sitemap-index.xml)