Feature Development – New Capabilities for Your Existing App
Your app works. But can it do what your users will expect tomorrow?
Feature development for existing apps starts at €7,999. In 4–8 weeks, you get new functionality cleanly integrated into your existing codebase – by a senior developer with 10+ years of experience in Kotlin, Swift, and Flutter.
When Is Feature Development the Right Move?
Markets shift, user expectations rise, competitors catch up. Standing still today means falling behind tomorrow.
Your users are asking for features that don't exist yet
When support tickets and app store reviews show a pattern, it's a clear signal. Ignore it and you'll lose users to the competition.
Your business model has evolved
In-app purchases via Google Play Billing or StoreKit, subscription models, new API integrations – after product-market fit, the app needs to grow with the business.
New technologies open up opportunities
AI personalization, Wear OS and Apple Watch integration, offline sync – now accessible with Kotlin Multiplatform, Jetpack Compose, and SwiftUI. The question is when your competitors will use them.
Regulatory requirements create new obligations
EAA/BFSG, expanded GDPR requirements, industry-specific compliance – not optional features, but legal obligations with fixed deadlines.
Spotted the need? Let's talk about your feature.
Book a CallIs Feature Development Right for You?
You know what you need – and want someone who delivers
Specific feature in mind? No agency overhead – an experienced developer who builds it right and on time.
Your internal team lacks specialized expertise
AI integration, Kotlin Multiplatform, accessibility, or Wear OS – we complement your team with the specific expertise needed.
A regulatory deadline is approaching
EAA/BFSG, data protection, industry-specific mandates – the deadline is fixed and you need someone who delivers.
Your app needs a technology leap
From XML layouts to Jetpack Compose, from UIKit to SwiftUI, from REST to GraphQL – modernization that opens up new possibilities.
This applies to you? Tell us about your project.
Book a CallHow We Approach Feature Development
Requirements Analysis
Before a single line of code is written: What should the feature solve for your users? What metrics define success? How does it fit into the existing architecture? Are there dependencies on backend systems or third parties?
Technical Design
Your senior developer analyzes the existing codebase and creates an implementation plan. This includes checking whether the architecture supports the feature or if preparatory refactoring is needed. You receive a realistic estimate – no optimistic fantasy numbers.
Iterative Implementation
Development in manageable iterations with regular check-ins. You see the progress, can provide early feedback, and corrections stay affordable. Every iteration delivers testable results.
Quality Assurance
Automated tests, manual QA on real Android and iOS devices, and code reviews are standard. We deliver features that don't just work, but remain maintainable.
Deployment & Rollout
Store submission, staged rollout, feature flags, and monitoring of initial user data after launch. No feature is simply thrown over the fence.
That's how we build features – when do we start?
Book a CallWhat Sets Us Apart from Agencies
Whoever plans it, builds it
The same senior developer analyzes, plans, and implements. No information loss, no telephone game.
We work with your codebase, not against it
Whether Kotlin, Swift, or Flutter – we respect your architecture. New features integrate seamlessly, not as foreign elements.
Honest estimates instead of lowball offers
We suggest alternatives that deliver 80% of the value at 30% of the effort. Your budget goes where it makes the biggest difference.
Knowledge stays with you
Clean documentation, tests, and traceable code. Your team or another provider can seamlessly continue the work anytime.
The right partner? Let's find out.
Book a CallPricing & Terms
Feature Development
from €7,999
The price depends on scope and complexity of the feature, the existing codebase, and the platforms involved. Typical engagements: 2 to 4 weeks.
You receive a binding quote after the requirements analysis.
All prices are exclusive of VAT. Every engagement begins with a free initial consultation.
Let's Talk About Your Feature
In 15 minutes, we'll discuss your requirements and give an initial estimate on effort and timeline. Free and no obligation.
Frequently Asked Questions
With AppBaumeister, a new push notification system can be built in 1–2 weeks; a full offline sync or AI integration may take 3–4 weeks. After the initial consultation, you receive a realistic timeline for your feature development.
Yes — whether Kotlin, Swift, Flutter, or React Native, AppBaumeister routinely works with unfamiliar codebases. During a brief onboarding phase we familiarize ourselves with the architecture, conventions, and build processes. We find our way even in undocumented code.
Absolutely — many AppBaumeister engagements are team reinforcements where we bring specific senior expertise. We integrate into your existing processes: Jira, Confluence, Slack, GitHub, GitLab.
After feature rollout, AppBaumeister jointly monitors the initial user data with you and fixes any issues. For long-term care we offer maintenance contracts with a dedicated contact from the collective.
Yes — if you have a feature idea but aren't sure whether it's technically sound or commercially worthwhile, AppBaumeister starts with a consultation. We give honest feedback, even if that means advising against a feature.
Yes. Most new app features require backend changes — new API endpoints, database extensions, webhook integrations, or cloud functions. AppBaumeister has dedicated full-stack members in the collective; Ktor, Node.js, Spring Boot, or Firebase are all covered.
AppBaumeister offers fixed prices for clearly defined features. After a free initial consultation, you receive a detailed quote with a transparent flat fee — full budget predictability, no hidden costs.
In the AppBaumeister initial consultation, we help you evaluate features by impact and effort. Proven methods like the Impact-Effort Matrix provide clear priorities. Together we identify the features that deliver the most value for your users.
No — at AppBaumeister, performance optimization is part of the development process from the start. We analyze the impact on load times and memory usage before implementation, and with efficient algorithms, lazy loading, and targeted performance tests we make sure new features don't slow down your app.
AppBaumeister uses staged feature rollouts: the new feature is initially released to a small percentage of users, so we can collect early feedback and fix issues before it goes live for everyone. This controlled approach minimizes risk.