Web Application & API Development
Customer portals, internal tools and API integrations for businesses. Custom web application development by Northerd in Kajaani, Finland.
Request a QuoteWhen off-the-shelf software does not fit
A custom web application can support a customer portal, order processing or an internal dashboard. We start with the people using it: what information do they need, who may change it and which systems must receive it? That makes it possible to scope a useful first release without unnecessary features.
The interface and integrations belong together
Alongside the React interface, we design the data model, permissions and APIs. Backend choices depend on requirements: Node.js, Python or Rust. Integration planning covers failure handling, retries and data synchronisation, rather than only the successful API request.
Agreeing on the delivery
The specification sets out screens, user roles, integrations and acceptance criteria. Testing covers agreed workflows on mobile and desktop. Source code handover, deployment instructions, technical documentation and post-launch maintenance are agreed as part of the delivery.
What determines cost and timing?
The estimate depends particularly on integrations, permission complexity and legacy data migration. A focused first release can be priced separately from later development. We quote against an agreed scope rather than promise the same price or timeline for every application.
Includes
- React / Next.js frontend development
- Node.js / Python / Rust backend APIs
- Database design and optimization (PostgreSQL, Redis)
- Third-party integrations (payment, auth, APIs)
- Performance optimization and caching
What to bring to the first discussion
- Who will use the application and what must they accomplish?
- Which existing systems or APIs does it need to connect to?
- Do you have interface sketches, existing data or a target launch date?