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Alexander LiashchukAL
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Alexander Liashchuk

@alexanderliashchuk

iOS Developer at Performance Golf who cut app bundle size by more than 60% and enabled remote mobile marketing experiments.

Poland
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At Performance Golf, I designed multiple UX flows from scratch and refactored payment and upsell systems to support pricing experiments. I also integrated a marketing SDK for remote experiments and reduced the app bundle size by more than 60%.

At Solvd, Inc., I revamped a client's payment solution across its iOS client and backend, resolving an issue that left approximately 10% of paying users without purchased services and boosting yearly revenue by 10–15%. I also migrated approximately 25% of a legacy codebase from Objective-C to Swift and improved architecture to reduce maintenance time by 40%.

Earlier, I engineered iOS applications as a self-employed developer and worked as a Junior iOS Developer at OrangeSoft. My experience includes Swift, Objective-C, iOS architectures, payment systems, and performance optimization.

Experience

Work history, roles, and key accomplishments

Performance Golf logoPG
Current

iOS Developer

Performance Golf

Jun 2025 - Present (1 year 4 months)

Designed and implemented multiple UX flows from scratch, improving the overall user experience.
Refactored the payment and upsell systems to enable pricing and marketing experiments on paywalls; launched and evaluated multiple pricing experiments and a trial test.
Integrated a third-party marketing SDK, enabling the digital marketing team to run fully remote, engineering-independent experiments on

Solvd, Inc. logoSI

iOS Developer

Solvd, Inc.

Sep 2019 - May 2025 (5 years 8 months)

Revamped the client's payment solution, encompassing both the iOS client and backend, which resolved the issue of approximately 10% of paying users not receiving the services they had purchased, boosting revenue 10-15% yearly. Transformed approximately 25% of the legacy codebase from Objective-C to Swift, resulting in reduced project build time and the elimination of numerous bugs and crashes asso

SE

iOS Developer

Self-employed

Nov 2016 - Aug 2019 (2 years 9 months)

Engineered 10+ iOS applications using Swift and Objective-C, improving performance by 30% and reducing load times by 35%. Designed, developed, and deployed bespoke iOS applications for diverse industries, enhancing client engagement and boosting user retention by 25%. Integrated third-party APIs, payment gateways, push notifications, and real-time data synchronization, optimizing app performance a

OrangeSoft logoOR

Junior iOS Developer

OrangeSoft

Apr 2014 - Nov 2016 (2 years 7 months)

Led the development of feature-rich iOS applications, implementing advanced animations and custom UI components that improved user engagement by 45%. Integrated Core Data and Realm for optimized local storage, reducing data retrieval times by 50% and enhancing offline functionality. Developed in-app purchase systems and subscription models, boosting revenue streams by 30% through seamless monetiza

Education

Degrees, certifications, and relevant coursework

BU

Brest State Polytechnic University

Bachelor's degree, Artificial Intelligence

2009 - 2014

My main goal was to gain as much experience in AI and software development as possible. I've also done some research in queuing network problems and constructing.

BS

Brest State School #25

English Language and Literature, General

1999 - 2009

It was public school, but I've managed to learn English there. I've took part at different English language contests among pupils from other schools from our region and republic.

Tech stack

Software and tools used professionally

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