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Development & IT Consultation with Konstantin K.

5.0 · 22 reviews

Development & IT Consultation with Konstantin K.

5.0 · 22 reviews

The experienced problem solver to help plan your project and solve current bottlenecks is available in a few clicks on the site.
Get personalized advice on:
Game Development Mobile App Development

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Konstantin K.Status: Offline

About Konstantin

Konstantin K.Status: Offline
Senior iOS & Mobile App Developer | Swift, Kotlin, React Native
100% Job Success
5.0  (22 reviews)
Vigo, Spain - 8:19 am local time
An iOS developer who takes apps from idea to millions of downloads. I built Struckd (12M+ downloads, acquired by Unity Technologies) and Daily Dozen (1M+ downloads, 4.9 rating, featured by Apple). 14+ years shipping Swift, SwiftUI, and React Native. 30M+ client app downloads total.

Most developers write code. I handle the entire product lifecycle - architecture, development, App Store submission, ASO, growth, and ongoing support. You focus on business and marketing, I handle everything technical. Need someone to drop into an existing codebase and ship features instead? I do that just as well. Whatever the project needs.

iOS native is my strongest skill - Swift, SwiftUI, SwiftData, UIKit, and Combine since day one, with a large library of reusable components for fast shipping. I also work deep in:

- Android - Kotlin, Jetpack Compose, Kotlin Multiplatform, Compose Multiplatform
- Cross-platform - React Native, Expo, Flutter
- AI integration - Claude API, OpenAI, CoreML, on-device ML, spec-driven AI-assisted development
- Specialized - HealthKit and medical apps, BLE hardware, fintech, and game dev (Unity, ARKit, SceneKit, Metal)

Growth is built in. I created ASOFast to solve App Store optimization at scale. I've gotten multiple apps featured by Apple and know the review process inside out. I also ran the CosmicTaps iOS portfolio (9M+ downloads).

Former CTO, Head of Mobile, and Tech Game Producer. If you need a developer who ships clean, scalable code, that's me. If you also need someone who thinks about the business value of what they're building, you won't find that combination twice.

Tell me what you're building, and I'll tell you exactly how I'd ship it.

What to expect

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Share details about your project and what you want to talk about. The freelancer will review and reach out if they have questions.
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1-on-1 meeting with the freelancer to discuss your needs and project.
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The freelancer will finish up the documents you asked for and send them to you for approval:
    Before the consultation

    Here’s what Konstantin will need to know before you meet

    1. Tell me about yourself and what you want to talk about
    Rating is 5.0 out of 5.
    (22)
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    KQ
    Kevin Q.
    5.0
    Jul 20, 2025
    Small UI project for an iOS developer (in SwiftUI) Konstantin has been amazing to work with: not only is he a super solid iOS dev, but he also brings tons of experience with all the technologies we use (iOS, Android, cross-platform, and web), as well as strong knowledge of scripts and automation. He also has a business mindset, which is rare: he always thinks about the business value of what he’s building and doesn’t hesitate to suggest smarter ways to do things. Also simply a great human and team player. Thank you, Konstantin!!!
    EW
    Eleanor W.
    5.0
    Apr 21, 2023
    Help distributing an iOS app to the App Store It was a pleasure to work with Konstantin. He was friendly, responsive, articulate, and very knowledgeable. Over a couple of calls, he walked me through a tough technical problem which had kept me stumped. A successful happy outcome for me, and a pleasure throughout. Thank you, Konstantin!
    DE
    David E.
    5.0
    May 4, 2022
    iOS Swift and SwiftUI developer needed to add features to a game Konstantin was a superb partner on my project, which is a game written in Swift, SwiftUI, and Kotlin (for iOS and Android). I would have continued to work with him had Upwork not terminated its presence in Russia.
    I have many years of software development and management experience at highly selective companies like Microsoft and Google, and I found Konstantin's work to be on par with that of those developers.
    Konstantin kept me updated on his progress every day, and he also updated the code in github daily. The app is in broad release and I've found very few bugs. He also fixed some performance problems that I had been unable to resolve even after prolonged effort.
    OW
    Oliver W.
    5.0
    Apr 11, 2021
    Implementation of iOS game port in React Native Fantastic work, we can absolutely recommend Konstantin.
    YS
    Yevgeniy S.
    5.0
    Dec 18, 2020
    Unity iOS Developer needed for short R&D Project He had really clear communication, did the project quickly, and was great at fielding questions. Very knowledgable with Unity and iOS