Yurii Babii

Case Study

UAdemy

Founder / Lead Developer · Mar 2022 – May 2023
Xamarin.iOS C# .NET Firebase TestFlight

A Ukrainian knowledge app — built and led a remote team of 6 through wartime constraints.

The idea

Ukraine's full-scale invasion began in February 2022. A wave of people wanted to reconnect with their roots — history, language, culture. UAdemy gave them a quiz-based learning experience they could use daily, on their phones, even in a shelter.

The constraints

We built entirely remote across multiple time zones, with team members dealing with air-raid alerts, power outages, and relocation. Keeping velocity steady while keeping people's wellbeing in focus was the core leadership challenge.

👥

Founded & led the team

Recruited and managed a cross-functional team of 6: iOS developers, a designer, and a content lead. Ran weekly syncs, set clear ownership, and kept the team psychologically safe during a stressful period.

📐

Engineering standards

Defined coding guidelines, Git branching strategy, and PR review norms from day one. Set up incident playbooks so any team member could handle a production issue without escalation.

🚀

Owned the release train

Ran the full release cycle end-to-end — TestFlight beta, staged rollout, App Store submission, version negotiation with Apple review. Every build from 1.0.0 to 1.3.8 went through me.

📊

Instrumentation & observability

Designed the metrics / log / trace taxonomy from scratch. Wired up dashboards and alerting via New Relic, Crashlytics, and AppCenter so the team had signal, not noise, when things went wrong.

total downloads
796 ratings
team led
1.3.8 build shipping

Source: App Store Connect, Jul 2026

View UAdemy on the App Store

UAdemy App Store listing showing Ukrainian quiz app with phone mockups
App Store listing — phone mockups showing quiz flow and onboarding.
App Store Connect downloads chart showing 25.3K total downloads
App Store Connect analytics — 25.3K total downloads to date.
App Store Connect ratings panel showing 4.9 out of 5 from 796 ratings
App Store Connect ratings — 4.9 ★ from 796 verified ratings.

Xamarin.iOS — native iOS

C#/.NET codebase compiled to a native iOS app, sharing business logic while using native iOS UI bindings. Let a lean team ship native quality without maintaining a separate Swift stack.

Firebase backend

Firebase (Auth, Firestore, Cloud Storage, Crashlytics, Analytics) gave us a production-grade, low-ops backend — critical for a lean team operating under wartime conditions.

Release pipeline

TestFlight for staged beta, automated build numbering, per-version changelogs, and a documented App Store submission checklist that any team member could execute.

Observability stack

New Relic for APM and custom dashboards, Crashlytics for crash symbolication, AppCenter for distribution. Unified metric/log/trace taxonomy defined upfront to avoid alert noise.