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Backend and API development

A secure, maintainable foundation behind your web or mobile product.

We design and implement the server-side logic, data and integrations that connect users, operations and external systems.

Who this service is for

  • Web and mobile products that need a new backend
  • Teams adding APIs, permissions or integrations to an existing system
  • Businesses that need secure administrative and data workflows

Problems we solve

  • Frontend experiences rely on fragmented or manual data handling
  • Users and administrators need clearly separated permissions
  • External services must exchange data reliably
  • The current backend cannot safely support planned features

Services

What the service can include

  1. Server-side architecture
  2. Database modelling and access
  3. Authentication and user roles
  4. APIs for web and mobile applications
  5. Administrative capabilities
  6. Third-party service integrations
  7. Security measures appropriate to the project scope
  8. Deployment, monitoring and maintenance

What you receive

  • A backend aligned with the product's roles and data flows
  • Documented interfaces between the product and connected services
  • Operational safeguards appropriate to the agreed risk level
  • A deployment and maintenance path

Our process

How we work together

We identify data ownership, permissions, integrations and failure cases before choosing the architecture. Existing systems are reviewed before any migration or takeover is proposed.

Relevant technology and platforms

  • Node.js
  • Firebase
  • Supabase
  • REST APIs
  • Cloud infrastructure

Projects

Projects that solve concrete business challenges.

The examples below reflect professional work and product experience behind CodeFusion; they are not presented as a seven-year company history or as products created solely by the newly established company.

Multilingual property and finance website

Matijaš Immobilien und Finanzen

A Serbian- and German-language website for presenting properties and financing solutions. Visitors can explore the offer by country, view property details and galleries, then send an enquiry through a clear journey.

Mobile platform for sports clubs

AktivZona

A cross-platform product for the day-to-day work of sports clubs, bringing together members and children, coaches, groups, schedules, attendance, membership fees, finance, reporting and announcements.

Local services marketplace

Prenesi.com

A web marketplace that makes it easier to find local services by city and category. The platform brings together listings, provider profiles, user accounts, favourites and moderation.

Related services

Web application developmentWeb applicationsMobile application developmentMobile applicationsE-commerce developmentE-commerceMaintenance and improvementsMaintenance and improvements

FAQ

Frequently asked questions

Can you build only the API for our existing frontend?

Yes, when responsibilities, data contracts, authentication and deployment requirements can be clearly defined with the existing team.

Can you connect to a third-party service?

Usually, if the provider offers suitable documentation, access and technical capabilities. We verify those conditions before confirming the integration.

Do you maintain the backend after launch?

Ongoing monitoring, fixes, updates and new capabilities can be included in a separately agreed maintenance scope.

Contact

Tell us what you need.

Share the essential details about your project. We will reply within one business day and suggest the next step.

Send enquiry