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Web applications

At simsustech we specialise in building complete web applications using our own, self-developed stack.

Frontend — Vue.js with Quasar Framework, resulting in fast, responsive and visually appealing interfaces.

Backend — a self-developed Node.js API based on Fastify, for speed and reliability. Its main features:

  • OpenID Connect (OIDC) authentication — a streamlined login experience, including third-party login with Google, Facebook or Microsoft.
  • Payments and invoicing — integrated into the web application, either built in or through an external API.
  • A type-safe API with tRPC — communication between the front end and the back end is efficient and faultless.
  • PostgreSQL — safe, fast and type-safe data storage with PostgreSQL and Kysely as the query builder. No limitations imposed by an ORM.
  • Server-side rendering — better search engine optimisation and quicker loading times.

Complete adaptability

The technical details above provide a solid, safe and fast base for your web application. Specific feature requests can usually be included, as long as they do not compromise security or reliability. For example:

  • Integrating your own or third-party npm packages.
  • Communicating with external APIs.
  • Theming the application to your liking.
  • Integrating a job scheduler (cron).

Proven success

Check out our open-source projects to see the stack in action:

Interface in Vue, Quasar and Vitrify; a typed contract with tRPC and zod; an API in Fastify; data in PostgreSQL through Kysely; and integrations for sign-in, payments and e-invoicing. One stack, end to end TypeScript from the database row to the button that renders it. INTERFACE Vue 3 · Quasar Framework · Vitrify CONTRACT tRPC · zod a changed field is a compile error, not a bug report API Fastify · Modular API DATA PostgreSQL · Kysely real SQL, typed — no query builder hiding the plan Integrations when they are needed: OpenID Connect, payments, EU invoicing.

Pricing

Every web application is different, so there is no price list. Tell us what you need and you get a fixed quote before any work starts — that quote is the price, not an estimate.

What moves the price

  • How many kinds of user there are, and what each of them may see and do.
  • Integrations. A payment provider, an accounting package, an existing database, a supplier's API — this is where the surprises are, and leaving one out is what makes a quote wrong.
  • Migrating data from the system it replaces, and how clean that data is.
  • Reporting and exports — dashboards, invoices, CSV or PDF output are their own build.
  • Rules you have to follow: invoicing standards, retention, audit trails.

What the quote covers

Front end, API, authentication, database design, the integrations above, automated checks, and the deploy. You own the code, and the handover explains how to run it — see how we work.

Looking for a web application, whether to serve your clients or as an internal tool? Contact us to discuss the requirements and the possibilities.

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