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HDdev
Web apps · custom

Custom web applications — designed, delivered, operated.

Business dashboards, internal tools, configurators, customer portals, API integrations. Modern stack, European hosting, contractual guarantees written into the contract.

02 · Tech stack

Default stack — battle-tested, durable, maintainable.

Frontend

  • · Next.js 14 App Router
  • · Strict TypeScript
  • · Tailwind CSS
  • · Static export or SSR depending on need
  • · i18n via next-intl if multilingual

Backend

  • · Node.js + Express or Python FastAPI
  • · PostgreSQL primary
  • · Redis for cache and queues
  • · Magic-link or OAuth authentication
  • · HMAC-signed webhooks, native idempotency

Hosting & ops

  • · Swiss Infomaniak (LPD/GDPR jurisdiction)
  • · Bunny.net CDN (EU)
  • · 30-day local backups + weekly off-site Swiss
  • · 24/7 in-house monitoring with auto-recovery
  • · Public status page on /status

Stack adaptable to your constraints (ERP compatibility, team language, hosting already in place). We discuss technical choices during scoping before issuing a firm quote.

03 · Types of projects we run

Six families of projects — all handled bespoke.

Business dashboards

Dashboards to track your KPIs in real time. Connect to your sources (DB, third-party APIs, files). Filters, exports, controlled sharing. Mobile responsive.

Internal tools

Custom tools for your operations: back office, business CRUD, approval workflows, recurring scripts with UI. RBAC authentication, audit logging.

Configurators and complex forms

Multi-step wizards, dynamic price calculations, conditional validation, Stripe integration, PDF/CSV exports. Ideal for automated quotes or structured registrations.

Customer or partner portals

Auth spaces (magic-link or SSO), personalised dashboards, downloads, invoices, service tracking. Integrated Stripe Customer Portal for subscriptions.

API integrations and orchestration

Stripe, Bridge, Peppol connectors, business services (ERP, CRM). Automated workflows, bi-directional webhooks, retry and idempotency. Complete documentation.

Advanced memory and AI

For projects that need a memory infrastructure (semantic search, classification, recommendation), we offer a dedicated orchestration layer to scope together.

04 · Pricing

Day rate or fixed package — depending on the nature of the project.

Custom dev day rate

For exploratory projects or one-off missions. Short commitment, iterative delivery.

  • · Day : 550 €
  • · Half-day : 290 €
  • · Hour : 80 €
book days →

Fixed project on quote

For structured, scopable projects. Written scope, signed milestones, milestone delivery.

  • · Initial scoping included (≤ 30 min) or rolled into the package depending on size
  • · Firm quote within 5 business days after scoping
  • · GTC article 4 guarantees (perf, compliance)
request a quote →

Got a project in mind?

Tell us in a few sentences. We reply within 24 business hours with an orientation (day rate or package), an estimate and the next step.