Khasan Abdullaev

• Developed iOS features across multiple product lines, implementing modular and scalable solutions to enhance user engagement and retention.
• Implemented systematic testing strategies, including unit, UI, and integration tests.
• Reduced crash rates by addressing concurrency issues, fixing unsafe API calls, improving thread handling with GCD/OperationQueue, resolving out-of-bounds and race-condition errors, and adding defensive logic for edge cases; contributed to a measurable reduction in Crashlytics-reported issues.
• Identified and fixed memory leaks using Instruments (Leaks, Allocations, Memory Graph), resolving strong reference cycles, eliminating retain cycles in closures, and refactoring heavy view controllers into smaller, lifecycle-friendly components — resulting in significantly lower memory consumption and more stable long-session usage.
• Optimized performance across UI and networking layers, including minimizing layout passes, reducing expensive computations on the main thread, caching heavy resources, optimizing JSON parsing, improving pagination, and batching network requests — leading to smoother scrolling, faster load times, and improved battery efficiency.
• Optimized backend and frontend flows, improving data handling, reducing latency, and enhancing overall app responsiveness.
• Refactored critical modules (networking, storage, UI rendering) to improve maintainability and performance, reducing technical debt and enabling faster iteration for future features.
• Defined and enforced coding standards and best practices, mentoring junior engineers to improve overall code quality and team productivity.
• Collaborated cross-functionally with product managers, designers, backend engineers, and QA teams to align technical solutions with business goals and roadmap priorities.
• Introduced monitoring and diagnostics tools such as Crashlytics, Xcode Metrics, and custom logging utilities, resulting in faster issue detection and prioritized bug resolution.
• Attended regular meetings with clients or stakeholders to discuss progress and address any concerns promptly.

Achieved

• Increased user engagement by 15% to 20%, and release predictability by 25%.
• Reduced load times by up to 40% and crash rates by 30%.
• Improved team productivity and code quality by 25%, reducing long-term maintenance overhead by 20%.

Technologies

• Languages/Frameworks: Swift, SwiftUI, UIKit, Combine, MatrixSDK
• Architecture & Testing: Clean Architecture, MVVM, MVP, SOLID, Tuist, XCTest, XCUITest
• Tools & CI/CD: Fastlane, GitHub Actions, Bitrise, REST APIs, third-party SDKs

• Built and maintained iOS features, improving user experience and engagement.
• Implemented automated testing frameworks to enhance code reliability and reduce regressions.
• Optimized memory usage and networking, improving app performance and responsiveness.
• Defined best practices and coding standards to ensure scalability and maintainable code.

Achieved

• Increased feature adoption and overall user satisfaction.
• Reduced bugs and improved app stability through automated testing.
• Enhanced app responsiveness, contributing to a smoother user experience.
• Strengthened team development processes via coding standards and best practices.

Technologies

• Languages / Frameworks: Swift, UIKit, RxSwift, Core Data, Moya, GCD, VoIP
• Testing: XCTest, XCUITest Automated test frameworks
• Performance & Optimization: Instruments, Memory Graph Debugger, Networking tools
• Collaboration & CI/CD: Git, Jenkins, GitHub Actions, Jira, REST APIs

• Developed and maintained iOS features across several product areas, delivering scalable and reusable components that improved the overall user experience.
• Optimized frontend and backend data flows through efficient API integration, improved state management, and strategic caching, resulting in faster load times and more responsive interfaces.
• Refactored and modernized existing codebases to enhance maintainability, strengthen memory management, and reduce performance bottlenecks.
• Collaborated with product managers, designers, and backend engineers to align technical implementation with business goals and delivery timelines.

Achieved

• Increased user engagement across multiple products.
• Reduced app crashes and improved overall stability.
• Enhanced data performance contributes to a smoother user experience.

Technologies

• Languages / Frameworks: C, Objective-C, Swift, UIKit, third-party SDKs
• Architectures: MVC, MVVM
• Performance & Optimization: Instruments, Profiling, Networking tools
• Collaboration & CI/CD: Git, GitHub Actions, Trello, REST APIs