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Oleksandr Zavazhenko

@oleksandrzavazhenko

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iOS Engineer at Miquido who cut a health app’s crash rate from 15% to 0%.

Poland

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At Miquido, I work across client products in healthcare, travel, telecommunications, fitness, EV charging, and fleet management. I take features from technical planning through production release, and contributed reusable components and analytics tracking to Salesmanago’s embedded iOS SDK.

On WimHofTechnologies, I reduced the production crash rate from 15% to 0% and migrated 126 storyboard-based screens to programmatic UI. I also built MQSwiftSign, an open-source Swift CLI for iOS code signing, and developed Cuply’s Go backend and React + TypeScript PWA.

Experience

Work history, roles, and key accomplishments

Current

Mobile Analytics SDK

Current

Salesmanago

Jan 2025 - Present (1 year 9 months)

Contributed to the development of an embedded iOS SDK integrated into third-party applications for a customer engagement platform. Developed reusable SDK components with stable public APIs and implemented analytics event collection and application lifecycle tracking.

IOS SDK Swift Analytics Backward Compatibility Versioning Maintainability

Current

iOS Engineer

Current

Miquido

Jul 2022 - Present (4 years 3 months)

Working across multiple long-term client products in healthcare, travel, telecommunications, fitness, EV charging, and fleet management. Collaborating closely with Product Managers, Designers, Backend Engineers, and QA while owning features from technical planning through production release.

Swift SwiftUI UIKit Objective C RxSwift GraphQL Firebase REST APIs WebSockets MapKit CoreLocation SPM CI CD

EV & Fleet Management

Orlen Charge / Orlen mFlota

Jan 2024 - Dec 2025 (1 year 11 months)

Developed production applications for electric vehicle charging and fleet management. Built charging session flows, charger state management, and QR-based charger onboarding, and implemented real-time updates using WebSockets.

Swift SwiftUI MapKit CoreLocation Firebase REST APIs WebSockets SPM Webkit CI CD

Telecommunications

Play

Jan 2023 - Dec 2024 (1 year 11 months)

Delivered customer-facing features for a large telecom application serving hundreds of thousands of users. Implemented KYC verification flows, payment functionality, and migrated legacy UIKit components to SwiftUI.

Swift SwiftUI UIKit Objective C Uber RIB GraphQL Firebase SSL Pinning

Fitness & Sports Technology

Hiveact

Jan 2023 - Dec 2023 (11 months)

Developed Bluetooth communication for connected fitness devices and built SwiftUI interfaces for real-time device interaction. Improved reliability of hardware communication and connection handling.

Swift SwiftUI Bluetooth

Travel & Tourism

TUI Poland

Jan 2022 - Dec 2023 (1 year 11 months)

Developed customer-facing functionality for one of Poland's leading travel operators. Delivered new product features from technical design through production release and integrated analytics and payment solutions.

Swift UIKit SwiftUI RxSwift Objective C Core Data Firebase Appsflyer OneSignal JavaScript Bridge

Health & Wellness

WimHof

Jan 2022 - Dec 2022 (11 months)

Reduced production crash rate from 15% to 0% by identifying and resolving critical stability issues. Migrated 126 storyboard-based screens to fully programmatic UI and built CI/CD pipelines.

Swift UIKit SwiftUI WatchKit Core Data Firebase Bluetooth Fastlane GitHub Actions

Developer

Cuply

Developed a location-based café discovery platform for remote workers. Built the backend in Go with PostgreSQL/PostGIS and a React + TypeScript PWA with offline support.

Go PostgreSQL PostGIS React TypeScript Maplibre Docker

Open Source Developer

MQSwiftSign

Developed an open-source Swift CLI providing a native alternative to Fastlane Match for iOS code signing. Automated certificates, provisioning profiles, and TestFlight deployment.

Swift CLI Code Signing Fastlane App Store Connect TestFlight