Mobile App Development

API & backend integration for your app

Connect your app seamlessly to existing systems: CRM, ERP, payment providers, notifications and custom backends. Robust API design, secure auth and real-time sync where needed.

Get a free quote Request for quote

Why professional API and backend integration?

An app is only valuable when connected to your business processes: inventory, orders, customer data, payments. Syncro designs and implements API connections that are scalable and maintainable. We work with REST, GraphQL, webhooks and event-driven architecture. Our mobile app projects often include integration with e-commerce and marketing automation systems.

For PIM and ERP we have specific experience. For data synchronization between systems we also build standalone integrations. Intake.

Capabilities

What we deliver

API design

REST or GraphQL APIs that connect to your existing backend or are built new.

Auth & security

OAuth2, JWT, API keys and encryption. GDPR and security by design.

Sync & offline

Offline-first sync, conflict resolution and real-time updates where needed.

Third-party connections

CRM, ERP, payment providers, notifications (push, email), PIM.

Why choose us

Benefits

Single point of contact

App and integrations by the same team; no separate vendors.

Reliable

Error handling, retries and monitoring. SLA when needed.

Scalable

Architecture that grows with volume and new systems.

How we work

Approach

Integration analysis

Inventory of systems, APIs and requirements. Technical design.

Development

Implementation of endpoints, auth and sync logic. Testing with staging.

Deploy & monitor

Production deploy, documentation and monitoring.

Technology stack

Technology

REST API GraphQL OAuth2 Laravel Node.js PostgreSQL Redis Firebase Mollie Stripe

Use cases

E-commerce app

Connection to webshop, inventory, payment provider and order processing.

B2B portal

CRM, ERP and documents in the app. Real-time pricing and availability.

FAQ

Frequently asked questions

One simple integration: from around €3,000. Multiple systems or complex sync: €8,000–€25,000. Often part of a larger app project. Quote.

One API connection: 1–3 weeks. Multiple systems and offline sync: 4–8 weeks. Depends on documentation and availability of the other party.

We build a middleware layer or discuss with the vendor whether an API can be made available. Sometimes official SDKs exist.

Yes. We use OAuth2 or JWT where possible, encryption in transit and at rest, and follow OWASP guidelines. No credentials in the app.

Yes. APIs change; we offer maintenance and monitoring. Often part of an SLA or retainer.

Explore all Mobile App Development solutions

Ready to get started?

Book a free intake and receive a tailored proposal within 48 hours.

Plan Intake No commitment · Free consultation