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Technologies

REST API: the standard bridge between your applications

The standard through which software systems talk — from the ERP to the mobile app.

A REST API is the interface through which software systems communicate under predictable rules — the de facto integration standard of the past two decades. When an online store pulls stock from the ERP, when a mobile app shows a customer's orders, or when invoicing software issues a document automatically at every sale, a REST API is almost always doing the work. We design and build such interfaces end to end: resource structure shaped around your business processes, authentication and access rights done seriously, versioning that never breaks partners' existing integrations, and documentation other developers can work from without calling us. We also build the other half: connecting your applications to others' APIs — banks, couriers, tax authorities, marketing platforms. A truth from the field: an API's quality shows in its documentation and error handling, not in the demo — exactly the areas haste skips and we treat contractually.

Let’s talk about your project

Message us on WhatsApp or send an email — you talk directly to a developer.

office@northdan.com · +40 752 070 247

What you get

Your systems, finally connected

ERP, website, mobile app and accounting exchange data automatically — manual Excel exports and retyping errors disappear.

A foundation for any future channel

Once the API exists, a mobile app, partner portal or marketplace integration all start from the same tested base.

Mature security and versioning

Standards-based authentication, granular per-resource permissions and versions that never break existing partner integrations.

Frequently asked questions

Which integrations do businesses typically need?

The most frequent among our clients: online store with the inventory ERP, automated invoicing with e-invoicing compliance, courier label generation and order synchronization with accounting. All of them flow through a well-built API.

Our legacy system has no API — is there a solution?

Usually yes: we build an API layer over its database or its existing export mechanisms, making the old system integrable without modifying it. It is often the pragmatic first step of a longer modernization.

How do you guarantee the API holds up over time?

Through an interface contract: disciplined versioning — breaking changes mean a new version, never surprises — automated tests on every route and documentation generated from code, always in sync with reality. Your partners integrate once.