Andrey Didenko

Mobile • Middle • Belgrade, Serbia • UTC+01:00 • Work permits: Serbia • Available in 2 weeks

iOS Developer

4+ years exp

Swift

Objective-C

Active 20 days ago

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Overview

Technical skills

Timeline

Roles

Overview

iOS developer at a Middle level focused on building consumer-facing screens and client-side features across UIKit and SwiftUI. The strongest proven skill is UI implementation and client logic as shown by InfoElementView.swift and DetailView.swift which include custom programmatic layout, input formatting and SwiftUI composables. There is little public evidence of background processing, offline sync, testing, CI/release automation or platform-level permission handling.

Technical skills

Languages

Swift

Objective-C

Mobile

SwiftUI

UIKit

Firebase

iOS SDK

Combine

Realm

XCTest

Other

Git

Rest API

A/B Testing

RxSwift

GitLab

GitLab CI

Swift Concurrency

SwiftLint

Fastlane

MVVM

SPM

iOS

Declarative UI

Frontend

CocoaPods

GCD

TestFlight

Deep Linking

MVP

VIPER

Timeline

Senior iOS Developer • Senior

RWB • Full-Time

May 2025 to Present 1 Year 5 Months In office

Led a deep refactoring of legacy business logic to speed up delivery of new features. Reduced onboarding time for the team and significantly lowered bug counts. Built reusable SwiftUI components to accelerate feature development and improve maintainability. Refactored core layers and modularized the codebase to improve build times and enable parallel work.

SwiftUI

Senior iOS Developer • Senior

X5 Tech • Full-Time

Jun 2023 to May 2025 1 Year 11 Months Belgrade In office

Led a redesign and business logic overhaul for a highly complex checkout flow. Shipped 100+ A/B tests to validate hypotheses and support data-driven product decisions. Implemented push notifications and deep-link handling, including scenarios when the app is fully closed. Architected and deployed an anti-fraud framework integrated with app logic, and led a gradual migration from UIKit to SwiftUI while preserving interoperability.

A/B Testing

SwiftUI

UIKit

iOS Developer • Middle

GreatBox • Full-Time

Oct 2022 to Jun 2023 8 Months Belgrade In office

Developed new screens and UI components with pixel-precise implementation and smooth user experience. Built the networking layer from scratch, including REST API integration, error handling, and data parsing. Implemented location and database modules as foundational parts of the app. Wrote and maintained technical documentation to support ongoing development.

Rest API

iOS Developer • Middle

Depo dev • Full-Time

Jan 2021 to Oct 2022 1 Year 9 Months In office

Built an iOS app from scratch and delivered an MVP by defining core architecture and foundational business logic. Established scalable development patterns to support future feature work. Set up Git workflows, introduced code review practices, and maintained release branches. Integrated analytics to track user behavior, conversion funnels, and feature adoption for data-driven decisions and targeted A/B testing.

Git

Middle Mobile Developer Confidence: Medium iOS Engineer

Platform Native Mastery

2/10

Knowing the mobile platform

Basic platform-native knowledge is present: correct use of AppDelegate/SceneDelegate, UIViewController lifecycle and UITextFieldDelegate, but no advanced lifecycle handling, state restoration, structured concurrency, or robust error handling beyond template patterns.

Evidence

Leasing-calc---1.0/Leasing Calc - 1.0/AppDelegate.swift: NSPersistentContainer usage and default lifecycle hooks

Leasing-calc---1.0/Leasing Calc - 1.0/Modules/MainModule/MainViewController.swift: viewDidLoad, keyboard dismissal and gesture hookup

MyPlaces/MyPlaces/SceneDelegate.swift: scene lifecycle methods present

Mobile UI/UX & Responsiveness

3/10

Smooth mobile experience

Solid practical UI work across UIKit and SwiftUI with custom views and programmatic Auto Layout plus SwiftUI composable views and scroll/offset handling, but no explicit accessibility, adaptive layouts for foldables/tablets, or internationalization evidence.

Evidence

Leasing-calc---1.0/Leasing Calc - 1.0/Custom Views/InfoElementView.swift: programmatic UI elements, layout constraints and UITextField formatting

Leasing-calc---1.0/Leasing Calc - 1.0/Custom Views/ResultElementView.swift: programmatic layout and multi-column results view

Weather/Weather Test App/View/DetailView.swift: SwiftUI header, offset-based animations and composable subviews

Performance & Battery

1/10

Speed and battery use

Minimal performance or battery work; uses URLSession dataTasks and DispatchQueue.main for UI updates but no profiling, baseline measurements, background-job design or battery-aware scheduling.

Evidence

Weather/Weather Test App/View Model/ViewModel.swift: multiple URLSession.dataTask calls with DispatchQueue.main updates

Offline & Data Sync

1/10

Working offline and syncing

Almost no offline-first or sync infrastructure; a Core Data NSPersistentContainer exists in the AppDelegate but there is no migration/versioning, sync engine, conflict resolution or queued idempotent retry logic.

Evidence

Leasing-calc---1.0/Leasing Calc - 1.0/AppDelegate.swift: persistentContainer and saveContext template

Device Integration

Using device features

Not evidenced in public code

Release & App Lifecycle

Building and publishing apps

Not evidenced in public code

Expertise

iOS• Middle

Industries

Financial Services• Middle

Technologies

iOS

Swift• since 2022 • Middle

Objective-C

UIKit• since 2023

SwiftUI• since 2023

RxSwift

Combine

MVVM

SPM

Realm

GCD

Firebase

iOS SDK

CocoaPods

XCTest

Swift Concurrency

VIPER

Fastlane

SwiftLint

MVP

Declarative UI

Deep Linking

TestFlight

Recommendations

Develop UI-heavy iOS features and prototypes that require custom programmatic views and SwiftUI transitions.
Implement client-side business logic components such as calculators, data formatting and local persistence for finance or consumer apps.
Extend skills into networked features with robust error handling and add offline-first behavior using local storage and sync patterns.
Work on instrumentation and performance profiling tasks to measure and reduce jank and optimize battery usage.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

Leasing-calc---1.0 MyPlaces Weather

Junior Frontend Developer Confidence: Medium UI Engineer

Junior frontend UI engineer focused on simple Progressive Web App interfaces and static product UIs. The strongest proven skill is implementing a basic PWA offline cache via a service worker (firstPWA/sw.js) together with simple cart persistence to localStorage (firstPWA/script.js). There is little evidence of advanced state management, accessibility engineering, automated testing, or production-grade performance measurement and tuning.

UI Component Architecture

2/10

How interface parts are built

Basic component-like separation via render functions and modular CSS, but no deliberate component architecture, composition pattern, or custom lifecycle hooks.

Evidence

firstPWA/script.js: function renderProducts

firstPWA/script.js: addToCart / updateCart functions

firstPWA/style.css: CSS variables and product-card styles

Responsive & Cross-browser

3/10

Works on all screens and browsers

Responsive layouts and PWA meta tags are present, with simple media queries and some platform-aware CSS, but no advanced cross-browser/RTL or feature-detection strategies.

Evidence

firstPWA/index.html: viewport and iOS PWA meta tags

firstPWA/style.css: grid-based .card-grid and @media queries

firstPWA/css/style.css: @media (display-mode: window-controls-overlay) usage and env() references

Performance Optimization

2/10

Speed of the interface

Basic offline support via a service worker cache-first strategy is implemented, but no measured optimizations, code splitting, or advanced runtime caching strategies are present.

Evidence

firstPWA/sw.js: caches.open and cache-first fetch handler

Accessibility & Semantics

2/10

Usable for everyone

Some semantic markup and image alt attributes exist, but there is no explicit ARIA, focus management, keyboard handling for custom widgets, or CI accessibility tooling.

Evidence

firstPWA/index.html: img elements with alt attributes

countdown-2026/index.html: simple semantic HTML structure (h1, div.timer)

State Management & Data Flow

2/10

Managing data in the app

Client-side state is handled with simple patterns (localStorage, arrays, DOM updates), but lacks request cancellation, optimistic updates, cache invalidation, or state machines for complex flows.

Evidence

firstPWA/script.js: cart persisted to localStorage and updateCart/updateCartUI functions

firstPWA/script.js: multiple local cart handling blocks (simple event-driven state updates)

UX & Visual Polish

3/10

Look and feel quality

UI shows attention to visual polish with responsive cards, shadows and transitions and a modal style, but UX flows (error/empty/loading states, undo, skeletons) are minimal or inconsistent across files.

Evidence

firstPWA/style.css: product-card styles, transitions and modal styles

countdown-2026/index.html: presentational timer UI

Expertise

HTML & CSS• Junior

PWA & Web APIs• Junior

Industries

Commerce• Junior

Food & Beverages• Junior

Technologies

Frontend

Recommendations

Consolidate and clean the cart state logic into a single predictable module and add robust edge-case handling (empty state, corrupted localStorage, duplicate items).
Improve PWA runtime strategy with smarter caching (runtime caching, stale-while-revalidate) and add Lighthouse audits with measurable before/after results.
Add accessibility improvements: keyboard focus management for modal/cart, ARIA roles for custom controls, and integrate an a11y linter or axe checks in CI.
Introduce a component approach (React/Vue/vanilla web components) or clearer modular patterns and add unit/UI tests to validate behavior

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

countdown-2026 firstPWA