Custom Software Development
Web applications, API integrations, and business-oriented digital products for Luxembourg startups and SMEs.
OneSpaceHouse designs and ships software aligned with your real processes — not technical demos disconnected from operations. Our technical team, led by CTO Júlio Papel, covers discovery through production, favoring modern, maintainable stacks suited to lean teams.
Project types
Business applications
Client portals, back-offices, approval workflows, partner extranets.
Integrations & APIs
ERP, CRM, payments, e-invoicing, webhooks — synchronized, traceable data.
SaaS products
MVPs with scalable architecture, auth, billing, observability.
Modernization
Progressive legacy refactors, cloud migration, targeted tech debt.
Preferred stack
We choose technology based on total cost of ownership, not hype:
- Front : Astro, React, TypeScript for fast sites and apps
- Back : Node.js, PostgreSQL, REST or GraphQL APIs
- Infra : Docker, EU hosting (GDPR alignment), CI/CD
Delivery method
- Scoping — User stories, MVP boundary, acceptance criteria
- Two-week sprints — Regular demos, visible backlog
- Quality — Code review, automated tests on critical paths
- Production — Monitoring, runbook, launch support
Recent deliverable patterns
- Multilingual document submission portal for a services SME
- E-invoicing connector + management dashboard
- Admin interface for an internal AI product (Laiss OSH AI)
Describe the business problem to solve — we’ll estimate a realistic MVP and delivery trajectory.