App development for iOS and Android
From flawless native builds to infinitely scalable cross-platform apps.
High-performing mobile apps for startups and scale-ups—native or cross-platform—with crisp UX and release cadence aligned to investors and enterprise buyers. Ship a net-new product, rebuild a stalled app, or mobilize internal tools without sacrificing speed or security.
App development for iOS and Android
What we deliver
Concrete deliverables, clearly scoped. You know before we start what you will have at the end.
Scalable cross-platform app development
We build with Flutter and React Native so your app looks sharp and runs well on both iOS and Android. No need to compromise or pay twice.
High-performance native app development
We build in Swift, Objective-C, Kotlin, and Java to get the most out of iPhone and Android hardware. Smooth, stable, and fully integrated.
App modernization & performance optimization
We forensically analyze what's dragging your app down—from outdated legacy code to clunky user flows and critical security gaps—and surgically bring things up to lightning speed without a total restart.
Secure enterprise mobility solutions
We architect unshakeable mobile systems for the real, heavy-duty work happening outside the office: field service operations, secure ERP access, and live CRM dashboards. Military-grade security included.
Rigorous testing & quality assurance
We break things in our test lab so your users don't have to. With Appium, Selenium, and Espresso, we test your app across devices, OS versions, and edge cases.
Proactive maintenance & ongoing support
We don’t just launch and vanish. When bugs arise, traffic spikes, or features need expanding, we are right there to fix, scale, and update—without vendor lock-in. You retain 100% control.
Why mobile teams trust us
Uncompromising performance
We obsess over delivering silky-smooth 60fps animations and near-instant load times across all supported devices.
Flawless integrations
We expertly wire your mobile front-end to complex back-end APIs, IoT devices, and sprawling cloud architectures.
User-centric architecture
Every architectural decision is made to ensure the end-user experiences zero friction and total delight.
One codebase discipline, AI-assisted QA
Cross-platform code plus AI-assisted test generation across devices. Seniors own performance budgets and store releases.
Process
Our mobile engineering process
Step 1: Deep discovery & requirements
We question what you actually need, who really uses it, and what measurable success looks like for your business.
Step 2: Behavioral design & prototyping
Crafting intelligent wireframes and highly-interactive working prototypes based on real-world human mobile behavior.
Step 3: Agile development & integration
Building rapidly in focused sprints, securely connecting to your APIs, and keeping momentum high.
Step 4: Ruthless testing & QA
A punishing matrix of manual edge-case checks and automated tests to catch the breaks before anyone else does.
Step 5: App Store launch & hyper-care support
Navigating the complex app store approvals, going live, monitoring vitals closely, and iterating continuously.
How an engagement runs
- Fixed-scope first release, then a retainer
- The first release has a defined feature set and a capped budget. Post-launch work runs monthly at the blended senior rate of $25–49 per hour.
- First release in 10–20 weeks (planning assumption)
- Cross-platform builds with one codebase sit at the lower end. Store review cycles and backend dependencies move the number more than screen count does.
- One accountable delivery lead, senior mobile engineers
- One lead owns scope and communication. Two to four senior engineers build, with QA covering real devices, not just simulators.
Tooling
Our mobile tech stack
- Mobile & UI frameworks
React Native
Flutter
Swift
Kotlin
Expo
Metro- Backend & infrastructure
Node.js
Firebase
Supabase
Google Cloud Platform (GCP)
AWS- DevOps & CI/CD deployment
AWS Amplify
Bitrise
GitHub Actions
Fastlane- QA & automated testing
Appium
Selenium
Espresso
XCTestDetox- Deep integrations
Stripe
Apple Pay
Google PayPlaid
Salesforce CRMCustom IoT APIs
What you walk away with
Store-ready app builds
Release candidates for Apple App Store and Google Play, with the listing material and the review process handled together with you.
Source code in your repositories
The full codebase, CI configuration, and signing setup documented so another team could take over.
Automated test coverage
Unit and UI tests for the critical paths, run on every build through the CI pipeline.
Release & monitoring setup
Crash reporting and analytics wired into a release checklist, plus a handover session for your team.
Is this the right service?
This works if...
- Your customers or field staff need the product in their pocket, offline-capable where it matters.
- You want one codebase for iOS and Android without paying for two separate teams.
- An existing app has stalled and you need a team that can read, rescue, and extend someone else's code.
Probably not if...
- A responsive web app would solve the problem. We will tell you that in the first call; app stores are a tax you should only pay when the device capabilities justify it.
- You need a game or heavy 3D. That is a different craft, and we are honest about not practicing it.
- There is no budget for maintenance. Apps without updates die in the stores within a year or two; we would rather not build one.
For AEYA we co-built a mobile-first health platform with a privacy-aware backend and bilingual EN/DE support from day one.
Read the case studyMore work in this area
Built for the German business environment
International companies running software and AI in Germany need more than engineering capacity. They need a partner who works the way German teams, procurement, and data protection officers expect. Your contract partner is SolutionPlus UG in Berlin.
German-speaking delivery lead
One accountable lead runs decisions, written updates, and handover in German or English. Your team in Germany is never the last to get context.
DSGVO and GDPR by design
Data-minimising architectures, EU hosting options, processing records, and DPAs (AVV) prepared together with your data protection officer.
German contracts and invoicing
EUR quotes, phased statements of work, German jurisdiction, and documentation that stands up to procurement and internal audit.
Integrates with German systems
We connect DATEV, SAP, Microsoft 365, Personio, Shopware, and your existing ERP or CRM instead of asking you to replace them.
Shared hours with Germany and the US
Shared working hours with Germany, plus enough shared time for US stakeholders so both sides keep moving.
EU AI Act readiness
Human review, audit trails, and model documentation for the AI systems we build, aligned with how German auditors expect AI to be governed.
Get in touch
Let’s build your next app
Book a consultation about your mobile plans. Estimates in EUR or USD.
Fixed scope, weekly demos
Your product factory for custom software. We diagnose your bottleneck first, then ship in fixed, weekly-demoed steps.
Shared working hours
Shared hours with Germany and the US East Coast, synchronous when it matters.
From MVP to scale-up
One partner across AI, web, mobile, and UX — through every stage of your product.
Email us
admin@solutionplus.io
Response time
Within one business day
Clear & direct
You're not the first to ask, and we're ready.
How incredibly fast can you start working on my mobile project?
We operate with immense urgency. We typically fully onboard new clients within 5-6 business days. For mission-critical MVPs or urgent feature work, we can align and deploy a dedicated squad even faster. Your kickoff covers exhaustive scoping, architecture alignment, and deep integration with your workflows so rapid delivery starts smoothly from day one.
Do I need to lock myself into a massive long-term contract?
No. You can start with a fixed-scope sprint, a short engagement, or a dedicated team — whatever fits your roadmap. If you later choose to internalize the team, we support the transition and hand over cleanly.
What makes SolutionPlus fundamentally different from traditional, slow outsourcing shops?
We work as an extension of your team, not as a ticket queue. The engineers you work with are senior-level. Communication is structured and transparent, and delivery is managed with one accountable delivery lead. You keep full control of your IP, your codebase, and your roadmap.
How much does an app cost?
A first release typically takes 10 to 20 weeks; price depends on platforms, device features, and backend needs. Cross-platform builds share one codebase to hold cost down. The cost calculator gives you a band; the scoping call fixes the number.