Mihaela Mihaljević Jakić

Senior iOS Architect & Developer

Experienced iOS engineer with a deep commitment to modular architecture and elegant code. I specialize in OpenAPI-driven development, building robust, multi-platform Swift applications that scale gracefully. My work is defined by clean structure, extreme attention to testability, and the kind of modularization that makes features easy to extend, reason about, and maintain. I take pride in shipping polished, production-grade software that balances design clarity with engineering precision.

Contact:

Email: mihaelamj@me.com
Phone: +385995491157
Location: Zagreb, Croatia
LinkedIn
GitHub
Website

Education:

M.Sc. in Information and Speech Science
University of Zagreb, Faculty of Humanities and Social Sciences

EXPERIENCE

Code Weaver (May 2024 - Jun 2025) – Senior iOS Developer

Anonymous Big EU Project

Refactored client backend OpenAPI specs and built a Swift networking package
Reorganized and clarified existing OpenAPI specifications to better reflect backend capabilities and client requirements. Ensured consistency and accuracy across endpoints and models
Created a modular Swift package to encapsulate networking logic, designed for clean separation of concerns, testability, and reuse across projects
Integrated Swift OpenAPI Generator to automatically generate type-safe API client code from OpenAPI specs, enabling seamless updates and minimizing manual maintenance
Streamlined the build process to regenerate client code automatically upon spec changes, aligning with CI/CD pipelines and reducing the risk of contract drift

Technologies: Swift, SwiftUI, REST, OpenAPI, Swift Package Manager, Swift Server, Unit Testing, UI Testing, Structured Concurrency

Everliv AI Fitness Chat

Developed comprehensive OpenAPI YAML specifications defining REST and Server-Sent Events endpoints for real-time chat functionality
Built mock Swift Vapor server implementation with REST API and SSE streaming capabilities for development and testing workflows
Integrated Swift OpenAPI Generator to automatically generate type-safe server code from YAML specifications, enabling seamless API contract enforcement
Generated modular Swift networking layer from OpenAPI specs, providing clean separation of concerns and automatic client code updates
Developed cross-platform SwiftUI chat clients for macOS and iOS with real-time messaging, error handling, and responsive user interfaces
Implemented comprehensive preview and testing systems with mock data scenarios, ensuring robust development workflow and UI validation across platforms
Engineered a custom Server-Sent Events (SSE) client with fine-grained streaming management, async/await handling, and resilient error propagation for real-time interactions
Refactored chat architecture using actors, modular components, and adaptive UI to ensure a scalable, maintainable, and clean codebase
Designed and implemented a rich ActionCard system supporting multiple types (nutrition, goal, measurement, etc.) with expandable content and platform-optimized UX
Enhanced user experience with image upload workflows, previews, adaptive layouts, and cross-platform interaction consistency

Technologies: Swift, SwiftUI, REST, OpenAPI, Swift Package Manager, Unit Testing, UI Testing, Structured Concurrency, SSE, OpenAPI, Swift Server

iOLAP (Nov 2022 - Mar 2025) – Senior iOS Developer

ZUMIEZ Stash App

Worked on the Zumiez Stash app as a Senior iOS Engineer
Created Swift network client code generator from OpenAPI specs
Refactored legacy applications and unit-tested critical components
Implemented a custom lightweight GraphQL client without external dependencies, featuring type-safe request handling, efficient query utilities, custom GraphQL schema parsing, and sophisticated error management
Designed and implemented a modular filtering system with dynamic UI components, supporting complex data sorting and real-time updates
https://www.zumiez.com
https://apps.apple.com/app/apple-store/id1163863113

Technologies: Swift, REST, OpenAPI, GraphQL, UIKit, UI in code, Swift Package Manager, Unit Testing

AI Chat SDK

Developed a cross-platform chat SDK for iOS and macOS using Swift and SwiftUI for an AI chatbot
Implemented real-time messaging, speech recognition, and UI components with modern architecture patterns
Designed using modular architecture with 10+ local packages handling UI styling, message management, socket communication, and speech recognition
Built with Combine for reactive programming, protocol-oriented design, and comprehensive testing infrastructure
Implemented platform-specific components with shared protocols ensuring consistent behavior

Technologies: WebSockets, Swift, UIKit, Artificial Intelligence, Swift Package Manager, macOS, Unit Testing, AppKit

iRobot App

Added features for the onboarding process
Automated localization

Technologies: Swift, SwiftUI, Swift Package Manager, Objective-C, UIKit, UI in code, Unit Testing

Cherishing Studio (Jul 2019 - Oct 2022) – Senior iOS Developer

Wheels Up

Modernized and refactored legacy Objective-C codebase to Swift
Improved maintainability and fixed bugs
Simplified login flow to enhance user experience and reduce authentication friction
Developed custom UIKit components to improve app performance and user interface
https://wheelsup.com
https://itunes.apple.com/us/app/wheels-up/id956615077

Technologies: Objective-C, Swift, UIKit, UI in code, Push Notifications, REST, AFNetworking, OpenAPI, Unit Testing

Birch Finance

Refactored a large iOS app’s UI and networking layer using modern Swift
Implemented MVVM architecture with a clean separation of concerns
Built a comprehensive networking library with complete test coverage
Organized code into feature-based modules
Improved code quality through formatting, linting, and testing infrastructure
https://www.birchfinance.com

Technologies: Swift, REST, UIKit, CoreAnimation, UI in code, Unit Testing, UI Testing

Budtz Innovation

Led the refactoring of a legacy iOS app’s UI and networking stack using modern Swift paradigms
Reorganized the codebase into scalable, feature-driven modules to improve team velocity and onboarding

Technologies: Swift, REST, UIKit, UI in code

Token (Jun 2014 - Aug 2019) – Senior iOS Developer

Kindergarten (Cancelled)

iOS app for a Croatian company, for managing kindergartens
Developed 90% of the app
Designed REST APIs and implemented them in the app
Implemented custom UI design code

Technologies: Objective-C, UIKit, UI in code, AFNetworking, AutoLayout, REST, Carthage, Unit Testing, CocoaPods

Whatt - social network

iOS app for a social network
Developed custom expandable TextView with links and tagging

Technologies: Objective-C, UIKit, UI in code, AFNetworking, AutoLayout, REST, Carthage, Unit Testing, CoreAnimation, CocoaPods

Christian Resources

Universal iOS app (iPhone and iPad), for a client through oDesk
Developed the application (100%)
Created design in Sketch and implemented it in the application, with dynamic UI for iPhone 4, iPhone 5, iPhone 6, iPhone 6 Plus, and iPad
Used Core Animation, Auto Layout, AFNetworking, remote audio streaming
Client changed parts of the UI afterward
https://itunes.apple.com/us/app/bible-study-tools-christian/id600610494

Technologies: Objective-C, UIKit, UI in code, AFNetworking, AutoLayout, REST, Carthage, Unit Testing, AVFoundation, CoreGraphics

ServicePal

Added custom features using Objective-C, UIKit
Dynamic Content Framework Developer – designed and implemented a template-based dynamic content creation system that allowed for real-time content generation and updates without requiring app redeployment
Increased development efficiency by 35%
https://servicepal.com

Technologies: Objective-C, UI in code, UIKit, CoreData, REST, Unit Testing

Breck World

Built app from scratch in Swift 4+
Built UI in code using UIKit and Auto Layout
Implemented networking layer using URLSession
ARKit integration

Technologies: Swift, UIKit, UI in code, CoreData, AutoLayout, REST, ARKit

Masinerija (Nov 2018 - May 2019) – Senior iOS Developer

Birthdayrama App

A fun way to share birthday wishes with friends and family
Refactored the entire app
Created a form factory for the app which uses many screens with input fields
Used the latest Auto Layout best practices
https://www.producthunt.com/products/birthdayrama

Technologies: Swift, UIKit, UI in code, CoreData, AutoLayout

Huxly App

Newsreader reimagined
Added many features and new screens to the app
Login / Sign up / Forgot password screens (dynamic form screens)
Demographics screens (dynamic radio control screens using Core Animation)
Home and dynamic filter screens
Sharing functionality

Technologies: Swift, UIKit, UI in code, CoreData, AutoLayout, REST, CocoaPods

Purch (Mar 2015 - Oct 2018) – iOS Developer

Consumr App

Adapted existing client application for iOS 8+
Performed detailed gap analysis for the application, including iOS frontend and REST API backend differences
Implemented custom UI design code (from design sheets)
REST API implementation
Used Core Animation, Auto Layout, AFNetworking, Push Notifications
https://x.com/purchxapp

Technologies: Objective-C, UIKit, UI in code, Push Notifications, CoreAnimation, REST, Unit Testing, AutoLayout, Barcodes & QRCodes

Shopsavvy App

App for shopping and barcode scanning
Developer in Swift, UIKit, Auto Layout
Worked on parts of the app including barcode scanning, QR code scanning and creation, and general bug fixing
https://itunes.apple.com/us/app/shop-savvy-barcode-scanner/id338828953

Technologies: Swift, UIKit, UI in code, CoreAnimation, REST, Unit Testing, AutoLayout, Barcodes & QRCodes, Swift Package Manager

QR Code Reader and Scanner App

Objective-C, custom UI in code
QR code scanning and creation
Added custom sharing and feedback functionality
https://itunes.apple.com/us/app/qr-code-reader-and-scanner/id388175979

Technologies: Objective-C, UIKit, UI in code, CoreAnimation, REST, Unit Testing, AutoLayout, Barcodes & QRCodes

Undabot (Sep 2013 - Jun 2014) – Junior iOS Developer

Tito

iOS (iPad) book application about the life of Josip Broz Tito
Objective-C, CocoaPods
Implemented custom UI in code (from design sheets)
CoreText custom page layouts

Technologies: Objective-C, UIKit, UI in code, CoreText, CoreGraphics, CoreAnimation, Carthage, In-App Purchase

wogibtswas.at

wogibtswas.at, Austria’s biggest “what’s on offer” portal
Objective-C, AFNetworking, REST services, CocoaPods
Custom UI design in code
https://itunes.apple.com/de/app/wogibtswas.at-aktionen-angebote/id771962700
https://www.wogibtswas.at

Technologies: Objective-C, UIKit, UI in code, AFNetworking, AutoLayout, REST, Carthage

Blade Soho App

Custom app for one of the leading London hair salons
Objective-C, AFNetworking, REST services, CocoaPods
Implemented custom UI in code (from design sheets)
https://www.bladesoho.co.uk

Technologies: Objective-C, UIKit, UI in code, AFNetworking, AutoLayout, REST, Carthage, Unit Testing

Coachlette App

Custom app for personal trainers and coaches
Objective-C, AFNetworking, REST services, CocoaPods
Implemented custom UI in code

Technologies: Objective-C, UIKit, UI in code, AFNetworking, AutoLayout, REST, Carthage, Unit Testing

SKILLS

Created with CVBuilder