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03/08 Web Applications

Web applications built for your business.

Platforms, internal tools, SaaS, dashboards, every project is built with the technology best suited to your problem.

Deliverable Custom web app
Included Design · Dev · API · Auth
Timeline 2 to 8 weeks on average
Stack SvelteKit · Next · Supabase

The problem

Generic tools hold you back.

Excel, Notion, Zapier, a generic tool: at first, it holds. Then the business grows and everything gets complicated. Data scatters, tasks repeat, each new customer costs more to manage. A custom application restores order: your processes, your rules, one tool.

The starting point is often a process, not an application: see process automation and client portals and internal tools.

What's included

A complete platform.

Product design

Information architecture, wireframes, UI, user journeys, an app that people enjoy using.

Full-stack development

Modern frontend, robust backend, scalable database. Clean, maintainable, documented code.

Auth & roles

Secure login, permission management, SSO if needed, production-ready.

Third-party integrations

Stripe, Resend, Google APIs, CRM, ERP, your app plugs into your existing ecosystem.

Dashboards & reporting

Real-time dashboards, exports, alerts, steer your business with the right data.

Deployment & monitoring

CI/CD, monitoring, logs, backups, the app runs 24/7 without manual work.

Our method

From idea to product in use.

  1. 01

    Framing

    We understand the business problem, users, constraints. We define a clear, pragmatic MVP.

  2. 02

    Design

    Wireframes, clickable prototype, validation with end users before writing a line of code.

  3. 03

    Development

    Short sprints, regular demos, feedback integrated. We ship early, iterate fast.

  4. 04

    Launch & follow-up

    Deployment, team onboarding, support. We stay as a partner after delivery.

The outcomes

What a well-built app changes.

10x Operational productivity
0 Manual entry errors
24/7 Availability

The questions we get asked.

Straight answers on budgets, timelines and how we work.

How much does a custom web app cost?

Budget depends entirely on scope. We always start with a free scoping session to estimate precisely based on your needs.

What technology do you use?

We choose the stack based on the project, not the other way around. SvelteKit or Next.js for frontend, Node/Bun for backend, Supabase or Postgres for the database. What matters: modern, performant, maintainable code.

Who owns the code?

You. 100%. Source code belongs to you, hosted on your GitHub, with full documentation. No proprietary lock-in.

A well-built app is a growth lever.

Free scoping · Reply within 24h · Luxembourg

Discuss your project

+352 621 526 847 hello@slash.lu WhatsApp