Flutter App Development
We build sleek, scalable apps tailored for your business — web, mobile, and desktop — using world-class Flutter expertise.
Modern app Alchemy
Modern Day Software Alchemy
Flutter & Mobile Team Lead — IT Transformation in the DACH Region
We build secure, high-performance applications and guide organizations through digital transformation — in the DACH region and beyond.
From mobile apps to enterprise rollouts: we deliver solutions that scale with your business.
See how we can helpFlutter · Mobile Team Lead · Apps · Software · Training · Consulting
About Us
The people behind OpenSphere
Maximilian Berktold
CEO · Flutter & Mobile Team Lead
As a Flutter and mobile team lead, I specialize in driving software teams to excellence through hands-on coding, strategic leadership, and agile processes. My mission: help companies scale, innovate, and deliver top-tier digital products.
At OpenSphere Software, we combine Flutter expertise with strategic IT consulting. We don’t just build apps — we guide organizations through change management, ensuring smooth adoption and sustainable success.
With a background as an entrepreneur, freelancer, and startup player, I bring a perspective that blends technical depth with a strong sense for business. I thrive on solving complex problems, thinking outside the box, and leading teams to success.
Our Offer
From App Development to Full IT Transformation
Led by an experienced Flutter and mobile team lead — from cross-platform apps to enterprise rollouts and team coaching.
Custom Software Solutions
Every organization has unique challenges. We design individual software to close gaps, streamline processes, and optimize workflows.
Change Management & IT Consulting
Technology alone is not enough. We guide organizations through IT system rollouts and digital transformations, ensuring smooth adoption and lasting success.
Package Offers
High-Performance Apps: From Foundation to Market Leadership
For mid-sized enterprises and startups, the challenge isn't just building an app—it's avoiding technical debt and creating an architecture that scales. We don't just write code; we build digital assets according to enterprise standards.
New Venture Build / Core Architecture Package
Your app is set up like a mature enterprise product from day one instead of a "let's see" experiment.
- Structured architecture: Clean separation of logic, data, and UI (Clean Architecture) that keeps features shippable even years later.
- Lifecycle & state management: Precise app initialization and efficient state management (Bloc/Provider) for predictable behaviour and performance.
- Ready for growth: Native i18n, dynamic theming (light/dark), and full flavorization (Dev, Staging, Prod) built in.
- Offline-first & caching: Intelligent data handling and local storage so the app works smoothly even in dead zones.
The Security Excellence Add-on
For industries with the highest requirements (Finance, Health, Gov), we provide a dedicated security layer:
- Device integrity: Jailbreak and root detection to protect against compromised hardware.
- Data lockdown: Full on-device encryption and utilization of Secure Storage (Keychain/Keystore).
- Identity & access: Seamless integration of 2FA and biometric authentication.
- Code hardening: Obfuscation and protection against reverse engineering.
Strategic Partnership & Engineering. Sometimes you don't need a new app from scratch, but the right brainpower to lead your existing team or accelerate development.
Technical Lead & Interim CTO
We take full ownership of your technical roadmap. From high-level architecture decisions to code reviews and mentoring your developers:
- Team leadership: Guiding internal or external teams towards best practices.
- Architecture governance: Ensuring the system remains scalable and debt-free.
- Process optimization: Implementing CI/CD, automated testing, and agile workflows.
Embedded Engineering
Need an expert to dive deep into the code? We join your team as active contributors:
- Active development: Writing high-quality, production-ready code (Flutter, Dart, Mobile Stack).
- Problem solving: Solving complex performance issues or refactoring legacy modules.
- Seamless integration: We work directly in your Jira, Slack, and Git environment.
Tech-Coaching & Knowledge Transfer
We are not a "black-box" agency. We act as your technical guardians: hands-on mentoring—we lead the technical implementation while simultaneously training your internal team—and expert knowledge transfer, translating complex tech into actionable insights so your team retains long-term control of the codebase.
Our Packages
| Service | Focus | Investment (starting at) |
|---|---|---|
New Venture Build / Core Architecture Package Project-based · Greenfield builds | We set up your entire product as a greenfield build—architecture, tooling and workflows—and train your team so everything fits from day one. | €20,000starting |
Security Suite Add-on · Regulated industries | Security upgrade for existing or new apps: encryption, 2FA, device integrity and hardening. | on request |
App & System Review One-time audit | Deep-dive analysis of your current setup: security, performance, architecture and refactoring roadmap. | €4,900 |
Technical Lead & Interim CTO Retainer · Strategic leadership | Fractional tech leadership for your product: roadmap, architecture decisions, reviews and mentoring. | €120/h |
Embedded Engineering Retainer · Hands-on delivery | Senior engineer embedded into your team: active development, refactoring and problem-solving in your toolchain. | €120/h |
Pro-level know-how, simply delivered.
Do you have a vision that needs a rock-solid foundation? Or an existing app that requires a professional review?
Get in contactOS-Software In Numbers
As Flutter and mobile trainers, we guide developers toward success through our courses. As Flutter lead developers, we have delivered dozens of end-user applications. Here’s what that looks like so far.
