SwiftUI · Backend migration
Modernizing established mobile apps
I’ve worked on moving an app used by millions to backend v3 and SwiftUI. This involved changing the app’s integration with a new backend version as well as its interface implementation.
DevelopmentBuild, modernize,
Build, modernize,
or untangle it.
I build apps, make architecture decisions, handle migrations, and untangle difficult integrations. I work in the codebase and take responsibility for getting the work done.
Development / Specific projects
When the work needs someone to own it.
Explore →
Kotlin Multiplatform migration
Shared business logic, iOS and Android integration, architecture, CI, and a migration your team can work with.
Explore →Difficult iOS bugs and integrations
Production failures across SwiftUI, UIKit, ad SDKs, view lifecycle, and configuration. Investigation and implementation.
Development / Selected work
Difficult engineering work. Done hands-on.
15+ years of hands-on delivery across new products and established systems. My experience spans native iOS and Android, Flutter, architecture, tests, and automation.
Kotlin Multiplatform · iOS · Android · Compose
Two companies. Two paths to shared code.
For one company, I defined the architecture, migrated business logic for both platforms, and started migrating UI to shared Compose code. For another, I helped adapt the architecture to iOS constraints, CI, releases, and everyday development, then recommended the next steps.
GAM · Other ad providers · iOS
Rebuilding how an app loads ads
I built consent-based provider selection and a simple interface for ad slots, added bidders, and fixed GAM request, configuration, and display issues. Released changes reduced unnecessary requests and improved CPM and impressions; the latest fixes are still awaiting release.
Tests · CI · Automation
Building the systems behind delivery
At Nebenan, my work included modular app structure and CI automation for translations, PR checks, and formatting, plus a Slack-to-Confluence tool for capturing decisions.
Sample reports
All sample reports →What the work looks like on paper.
Fictional companies and synthetic data. The same structure and depth as my client reports.
Working with your data
Questions before you grant access.
What access do you need?
Read-only access to where the answer lives: analytics, your data warehouse, App Store Connect or Google Play, logs. Through your VPN if you prefer. Before we start, I send a short list with the exact roles, so your team can set it up quickly.
Why read-only access and not exports?
Investigations don’t follow a script. One finding points to the next table. With direct access I can follow it the same hour instead of waiting days for the next export.
How do you handle our data?
We sign a data processing agreement before I see anything. Data I export for analysis stays on my encrypted laptop, is used only for your project, and is deleted when the work ends. Reports go to you through your own channels.
Do you use AI?
No AI provider ever gets your users’ data. I use AI as a tool to check queries and research markets. Code is mine: I write and review every line, and AI assists only if you agree.
Technology background
Across platforms. Across generations of software.
My recent work centers on mobile products, KMP, migrations, and product analytics. My broader background also includes desktop and frontend development. The right approach depends on the existing system and the problem at hand.
iOS & Android
Objective-C, Swift, SwiftUI, Java, Kotlin
Shared foundations
Kotlin Multiplatform, Flutter, React Native
macOS, Windows & Linux
macOS applications; C++ and C# on Windows; Qt and GTK+ on Linux
Interfaces & underlying data
Frontend development, SQL, analytics implementation, and data analysis
Systems that support the product
Architecture, automated tests, CI, automation, integrations, and backend-version migrations
New and established products
Prototypes, MVP delivery, feature development, modernization, and ongoing work in existing apps
How I contribute
See my professional background →From a defined feature to a difficult migration.
Give me a delivery area to own or bring me into your existing team. I make architecture decisions, implement changes, review code, and put tests and automation in place.
When the uncertainty is about user behavior, measurement, or what to change next, I also investigate the product question behind the work.
Explore Product & data →Let’s talkBring me
Bring me
the problem.
An app that needs building. A migration that needs someone to own it. Numbers that don’t make sense. A product decision your team can’t resolve. Tell me what’s happening. I’ll tell you whether I’m the right person, how I’d approach it, and what the work would cost.
Email Alex ↗alex@x91tech.comYou bring the context. I take the work seriously.
Not sure what you’d get? See sample reports →