Dennis Lysenko, Developer in Los Angeles, CA, United States
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Dennis Lysenko

Verified Expert  in Engineering

Full-stack Developer

Los Angeles, CA, United States
Toptal Member Since
January 1, 2020

Dennis has over a decade of experience crafting iOS and Android apps, blending technical mastery with startup experience. He delivers excellent, rapid, business-focused, and enduring solutions. Dennis is an expert in the full pipeline from requirement planning, design, and development to app launch and user acquisition.


Milki Studio Pty Ltd
iOS, Swift, Metal, SwiftUI, Core Image, AVFoundation, UI Animation, UIKit...
ARKit, iOS, Xcode, Metal, AVFoundation, Swift, App Store Optimization (ASO)...
Metal, Git, Node.js, iOS, Swift, AVFoundation, Mobile, Swift 4...




Preferred Environment

Git, Xcode, iOS, In-app Purchases, Ruby on Rails (RoR), Mobile Development, Flutter, React Native

The most amazing...

...experience I've had was crafting a unique concept, designing and delivering an app that drives monthly downloads and revenue.

Work Experience

iOS Developer

2023 - 2023
Milki Studio Pty Ltd
  • Evaluated and gave a comprehensive crisis plan to stabilize the client's frequently crashing app that also leaked memory and stuttered in the UI.
  • Implemented a step-by-step, tiered solution plan that progressively fixed issues in order of highest impact.
  • Made the app run smoothly at 60 fps and separated concerns between the data and rendering layers to avoid memory leaks crashing.
Technologies: iOS, Swift, Metal, SwiftUI, Core Image, AVFoundation, UI Animation, UIKit, iOS SDK, Xcode, Git, In-app Purchases, iTunes Connect

VP of Research and Development

2021 - 2023
  • Managed launches for multiple apps within the company, handling ASO (App Store Optimization) and ideation, resulting in six-figure monthly downloads for the top apps.
  • Built a highly specialized live face-tuning and makeup app using state-of-the-art AR technology from scratch, using Metal and Swift.
  • Added modules and functionality to multiple apps within the company's portfolio.
Technologies: ARKit, iOS, Xcode, Metal, AVFoundation, Swift, App Store Optimization (ASO), ASO, Mobile, Core Image, Swift 4, Mobile Development, UI Animation, UIKit, iOS SDK, Augmented Reality (AR), Product Management, Git, Business, In-app Purchases, iTunes Connect, Design, UI Design, UX Design, iOS UI Design

Director of Product Engineering

2018 - 2020
  • Led and executed an iOS app and mobile graphics development using SceneKit and later a custom metal renderer with simple augmented reality features.
  • Contributed to deciding product priorities based on engineering efforts and helped to translate business ideas into programming tasks.
  • Managed technical investigations relating to business requirements, to ensure the company stays on the cutting edge in the realm of native mobile video.
  • Contributed to the overall product, design, and engineering process.
Technologies: Metal, Git, Node.js, iOS, Swift, AVFoundation, Mobile, Swift 4, Mobile Development, UI Animation, UIKit, iOS SDK, CocoaPods, Xcode, Product Management, iTunes Connect

Lead Developer

2017 - 2018
  • Led the architecture and implementation of an AR app, including ARKit, video rendering and I/O, 3D graphics, and the full VFX pipeline.
  • Managed iOS and GPU-based FX and 3D graphics developers to create a cohesive app and render a pipeline with QA.
  • Oversaw and occasionally led the implementation and usage of neural networks and classical computer vision algorithms on mobile devices.
  • Led iOS UI development and client-server sync architecture.
  • Shaped and evolved project architecture, reconciling product requirements with technical workflow.
Technologies: iOS SceneKit, Metal, Swift, iOS, Xcode, ARKit, AVFoundation, Mobile, Swift 4, Mobile Development, UI Animation, UIKit, iOS SDK, CocoaPods, Augmented Reality (AR), Git, iTunes Connect

Auto Caption: Video Subtitles
A monetized, AI-powered live video captioning and editor app on iOS with over 10,000 downloads. Powered by state-of-the-art on-device ML, this app automatically generates highly accurate captions. It allows you to browse and customize styles and export a social media-ready video in seconds.

Riff for Artists
Cross-platform app to create music videos from artists' tracks on streaming services and post to social media. The iOS version has advanced FX built using Metal and AVFoundation. The back end is in Ruby on Rails, Node.js, and Python.

Medical Records Server and iOS Consultation App

An iPad-compatible iOS app and RoR back end for doctors to log details about their appointments. Communicates with a central back office for patient record storage. Compliant with government requirements for prescription writing. Communicates over local network or HTTPS.

A monetized, subscription-based app for users to get a second phone number, with integrated in-app messaging capabilities. Communicated directly with telecom back end. I was chiefly in charge of the in-app purchase integration and compliance.

AI MP3 Enhancer
A monetized Swift-based app for audio editing, file format conversion, and automatic AI-powered denoising. I was tasked with the project's ideation, design, development, and delivery, including the marketing assets and launch plan.

Arturo &

A shoppable video app and a collaborative content creation app boasting a brand-new video editor with all the features in Instagram's stories editor plus numerous extra ones that were added. This project included versioning and collaboration features.

Nü Photo

An app offering users a variety of GPU-powered, AR-style filters to augment photo and video content with interesting visuals and effects. I designed this app with Sketch and used Swift and Metal for the implementation.

Sanction Search
I built a website that scrapes various web services to identify violations by people and vendors engaged by the website users. This was built end-to-end as an automatically running service and handles 15 different websites for source data.

Android Developer Certification

An online freelance agency


Core Image, CocoaPods, React, Node.js, jQuery, API Development, Shopify API


Xcode, iTunes Connect, Android Studio, Git


Ruby on Rails (RoR), Metal, StoreKit, UIKit, iOS SDK, ARKit, iOS SceneKit, Redux, SwiftUI, Flutter, React Native


Swift, JavaScript, Ruby, Swift 4, TypeScript, Objective-C, Kotlin, Python


UI Design, UX Design, iOS UI Design, App Store Optimization (ASO), Mobile Development


iOS, Web, Mobile, Android


Product Management, AVFoundation, In-app Purchases, ASO, Augmented Reality (AR), Business, Monetization, App Design, Design, Screenshots, UI Animation, SDKs, SDK Development, Software Development Toolkits (SDK), Scraping

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