Backend & API Development
Overview
Whether an app or portal truly works in everyday use is often decided not in the interface but in the interplay of data model, role logic, integrations, security and operational reliability. That is why backend and API development is not a purely technical discipline but a central part of product quality. allaboutapps develops backends and APIs in Vienna for apps, portals and platforms - with focus on system integration, scalability and long-term maintainability.
Discover our work
Why backend and API logic determine a product's viability
Many digital products appear simple on the surface but are highly interconnected behind the scenes. Roles, permissions, system boundaries, data flows and integrations determine whether a product scales reliably or noticeably loses speed with every extension. Good backend and API development makes this complexity manageable.
Model data and domain logic cleanly: Backend development does not begin with endpoints but with understanding the business domain. Which objects, states and relationships are truly relevant? Which rules apply independently of the interface? Which information needs to be versioned, logged or kept consistent across multiple systems? When these questions are answered cleanly early on, backends emerge that not only work today but can grow with future requirements.
APIs are contracts between systems and products: APIs should not just deliver data but represent clear and reliable contracts. They define which information is available, how states are passed, which error cases can occur and how different systems communicate. Good API development therefore pays attention to consistency, versioning, documentation and real usage scenarios - not just technical reachability. This is especially critical when multiple frontends, partner systems or legacy systems are connected to the same logic.
Security, roles and traceability belong in the foundation: As soon as digital products work with sensitive data, internal processes or multiple user groups, security and authorization topics become core architecture concerns. Who can see what? Which action is permitted for which role? How are changes traceable? How are systems protected against abuse, inconsistencies or unclear states? Good backend development treats these questions not as a later compliance task but as part of product design.
Scalability and operations do not emerge only under load: Scalability is more than the ability to process many requests. It also depends on how clearly responsibilities are distributed in the system, how observability is built and how outages or load spikes are absorbed. Logging, monitoring, alerting, error transparency and clean operational processes turn a technically functioning backend into a reliable product foundation. This is indispensable especially for growing platforms or service-critical applications.
Integrations and legacy systems must be assessed realistically: In many projects, the backend is where new product logic and existing system landscapes must converge. ERP, CRM, identity solutions, third-party services or internal business systems often determine which data is available when and how processes can practically be implemented. Good backend and API development assesses this reality soberly. The goal is not a perfect greenfield vision but an architecture that integrates what exists, makes risks transparent and still leaves room for evolution.
Good backend decisions make future development faster: Technical debt accumulates in the backend often gradually. What seems pragmatic at the start can later slow down every extension. That is why it pays to think early about domain boundaries, decoupling, documentation, testability and governance. The result is not a perfect system but a backend that facilitates decisions and does not lead teams back to the same limitations with every feature.
What our clients say
Got a question? We've got answers
Do you support products after launch?
Yes. The launch is typically not the end but the start of the next learning and optimization cycle. Ongoing development, stabilization, prioritization and new features should be understood as part of the product lifecycle.
Do you handle development only, or also product strategy, app design and UX/UI?
Both. Many projects don't start with finalized requirements but with open questions around scope, priorities, platform choice, interaction logic or design systems. That's why product strategy and app design are often part of the engagement from the very beginning.
What kind of projects is allaboutapps the right partner for?
allaboutapps is a strong fit when a company is looking for more than just implementation - a partner that combines product thinking, app design, UX/UI, engineering and ongoing development. We also help teams establish secure vibe coding setups and turn AI prototypes into production-ready software.
How long does it take to develop an app?
Development timelines vary significantly by scope. Simple apps can be delivered in roughly 2-3 months, while complex platforms with integrations, role models and extensive business logic may take 9 months or longer. Beyond development itself, planning, testing and certification play an important role. Our agile approach allows us to deliver initial versions early in the process.
How do I get a proposal for app development?
Getting a proposal is straightforward: reach out via our contact form or schedule an initial call to discuss your project idea and requirements. Based on that, we can provide a first cost estimate. If your requirements are already well-defined, we create a concrete proposal including scope, budget and timeline - giving you a transparent foundation for planning from day one.
How much does it cost to develop an app?
App development costs depend heavily on scope, complexity and required features. Simple apps with core functionality typically start at EUR 30,000-50,000, while custom platforms with complex integrations, user roles and backends require more investment. Factors like design, system integration (e.g. ERP, CRM), security requirements and cross-platform development significantly affect total cost. We recommend starting with a scope workshop to clearly define requirements and build a transparent proposal from there.
Can allaboutapps take over and evolve an existing application?
Yes, we regularly take over existing systems and apps from clients. We start with a code and architecture review to assess the current state of the software. From there, we can optimize, modernize or extend it with new features. If the existing codebase is no longer viable, we can also handle a migration to modern frameworks or a full technical redesign.
What does the app development process look like?
A typical project starts with a kick-off and a scope workshop where we define requirements and goals together. Our designers then create initial UX and UI concepts, closely aligned with the client. Development follows in agile sprints, giving you regular visibility into progress. After thorough testing - including automated tests, QA and usability checks - the app goes live in the app stores. We continue to support you with hosting, maintenance and ongoing development to ensure long-term success.
