Alexey Marinin
Texas, United States
Senior iOS Developer at Avito
Alexey Marinin is a Senior iOS Engineer with six years of experience designing high-performance mobile applications for top-tier technology and finance companies with over 100 million active users and $8.5+ billion in combined revenue. Based in Austin, Texas, he specializes in Swift, SwiftUI, UIKit, and architectural patterns including MVVM, Clean Architecture, and Backend-Driven UI, consistently delivering measurable business impact across fintech, e-commerce, and consumer app sectors.
Currently working as Senior iOS Developer at Avito (April 2025 - Present), one of the world's largest classifieds platforms with 113+ million users, Alexey designs scalable architecture for the New Cars category, builds reusable UI widgets enhancing conversion rates, and collaborates cross-functionally to ensure high-quality iOS releases.
At Devexperts (July 2024 - January 2025), a global fintech software provider, he led development of a high-performance iOS brokerage application for TD Bank's platform reaching over 27.5 million global customers. He contributed to 40% faster UI responsiveness and 20% improvement in release efficiency through CI automation while reducing bug-related support tickets by 30% and ensuring 99.9% app uptime during production releases.
His breakthrough achievement came at Promsvyazbank (August 2023 - September 2024), where he developed and deployed a secure network layer for the Digital Ruble project using Swift concurrency, enabling the first real transaction with Russia's Central Bank. He led multi-platform library development for digital currency transactions used by 9,000+ users and 1,200+ businesses and boosted unit test coverage from 34% to 97.5%, accelerating releases by 10%.
At Ozon (November 2021 - August 2023), an e-commerce superapp with over 100 million users, Alexey spearheaded an analytics system powering 3x ad revenue growth from $53.3 million to $165.5 million. He engineered 3x CPU reduction and 30% faster startup via banner video system redesign, integrated Audio Watermark technology securing $11 million in street ad discounts, and created reusable DesignSystem components adopted across 80+ developers. He conducted 50+ candidate interviews and provided extensive mentorship.
At MTS Group (October 2020 - November 2021), he built core financial library for brokerage transactions increasing mobile user activity by 25%, developed an auto-investment feature attracting 10,000+ new users, and authored company-wide style guides reducing review times by 30%. At Sberbank (November 2019 - October 2020), he created a Process Mining app visualizing workflows from over one million daily documents and revamped the "Sber Shareholder" app boosting installs by 20%.
Alexey's commitment to engineering education includes his role as Mentor & Instructor at OzonTech Route 256 (May 2022 - August 2022), teaching mid-level iOS developers with curriculum on architecture, testing, and clean code. His thought leadership extends through technical articles on RunLoop usage, Async/await vs GCD, UIKit layout approaches, and unit testing economics, plus peer-reviewed research in scientific journals on mobile application architecture, automated testing, digital transaction security, and marketplace app efficiency. His TechTimes interview "Growth is the ability to work under conditions of uncertainty" and active LinkedIn presence cover technical debt, mentorship, AI/AR convergence, and SwiftUI vs UIKit pragmatic approaches.
Currently working as Senior iOS Developer at Avito (April 2025 - Present), one of the world's largest classifieds platforms with 113+ million users, Alexey designs scalable architecture for the New Cars category, builds reusable UI widgets enhancing conversion rates, and collaborates cross-functionally to ensure high-quality iOS releases.
At Devexperts (July 2024 - January 2025), a global fintech software provider, he led development of a high-performance iOS brokerage application for TD Bank's platform reaching over 27.5 million global customers. He contributed to 40% faster UI responsiveness and 20% improvement in release efficiency through CI automation while reducing bug-related support tickets by 30% and ensuring 99.9% app uptime during production releases.
His breakthrough achievement came at Promsvyazbank (August 2023 - September 2024), where he developed and deployed a secure network layer for the Digital Ruble project using Swift concurrency, enabling the first real transaction with Russia's Central Bank. He led multi-platform library development for digital currency transactions used by 9,000+ users and 1,200+ businesses and boosted unit test coverage from 34% to 97.5%, accelerating releases by 10%.
At Ozon (November 2021 - August 2023), an e-commerce superapp with over 100 million users, Alexey spearheaded an analytics system powering 3x ad revenue growth from $53.3 million to $165.5 million. He engineered 3x CPU reduction and 30% faster startup via banner video system redesign, integrated Audio Watermark technology securing $11 million in street ad discounts, and created reusable DesignSystem components adopted across 80+ developers. He conducted 50+ candidate interviews and provided extensive mentorship.
At MTS Group (October 2020 - November 2021), he built core financial library for brokerage transactions increasing mobile user activity by 25%, developed an auto-investment feature attracting 10,000+ new users, and authored company-wide style guides reducing review times by 30%. At Sberbank (November 2019 - October 2020), he created a Process Mining app visualizing workflows from over one million daily documents and revamped the "Sber Shareholder" app boosting installs by 20%.
Alexey's commitment to engineering education includes his role as Mentor & Instructor at OzonTech Route 256 (May 2022 - August 2022), teaching mid-level iOS developers with curriculum on architecture, testing, and clean code. His thought leadership extends through technical articles on RunLoop usage, Async/await vs GCD, UIKit layout approaches, and unit testing economics, plus peer-reviewed research in scientific journals on mobile application architecture, automated testing, digital transaction security, and marketplace app efficiency. His TechTimes interview "Growth is the ability to work under conditions of uncertainty" and active LinkedIn presence cover technical debt, mentorship, AI/AR convergence, and SwiftUI vs UIKit pragmatic approaches.
He holds a Master's degree in Computer Science from Synergy University Moscow (2021-2024), completed the prestigious School 21 / Ecole 42 Software Engineering Program (2019-2021), and earned a Bachelor's degree in Computer Science from Synergy University (2014-2018). His technical expertise spans Swift, Objective-C, SwiftUI, UIKit, RxSwift, Combine, GCD, Async/Await, MVVM, Clean Architecture, CI/CD, and TDD.
What distinguishes Alexey is his ability to deliver systems driving substantial business outcomes—from tripling ad revenue to enabling first-of-its-kind digital currency transactions with central banks. His consistent focus on quality engineering through 97.5% test coverage, architectural excellence, and mentorship positions him as an ideal technical leader for organizations requiring senior iOS expertise that transforms complex requirements into elegant, scalable mobile applications supporting millions of users.
What distinguishes Alexey is his ability to deliver systems driving substantial business outcomes—from tripling ad revenue to enabling first-of-its-kind digital currency transactions with central banks. His consistent focus on quality engineering through 97.5% test coverage, architectural excellence, and mentorship positions him as an ideal technical leader for organizations requiring senior iOS expertise that transforms complex requirements into elegant, scalable mobile applications supporting millions of users.