Konstantin Simakov

Hello!


My name is Konstantin Simakov and I am a developer with over 15 years of experience in commercial software development.

I specialize in building iOS apps and have worked with multiple companies as a remote contractor for the past 10 years.

I focus on creating applications with a user-friendly and intuitive interface, always considering the needs of both users and businesses.

I strive to keep things as simple as possible. I believe that the best solutions are the ones that are easy to use and understand.

Personal info

Info:
Language skills:
  • Russian: Native
  • English: Advanced
  • German: Intermediate
Interests:
  • Extreme sports
  • Music
  • Traveling

Overall Technical Skills

Languages: Swift, Objective-C, Rust, Java, Node.js, JavaScript
Databases: Realm, CoreData, SQLite, MongoDB
Development Software: Xcode, VS Code, Git
Graphics: Figma, Sketch, Adobe Photoshop, Adobe Illustrator, Adobe XD
Technologies: SwiftUI, UIKit, Core Graphics, Core Animation, CoreData, RESTful web services
Services: Jira, Gitlab, Github, Fastlane, Firebase

My projects

Mobile apps

Mode

AppyCouple Wedding App

Invoice Ahead

PostalPix

Events Apps

Rio Novo SAC

RioNovo

On.com

Friskee

"Open Budget" app prototype

Stunr

Caliente

Experience

Remote iOS developer

Mode - Secure communication app
March 2019 - May 2025

  • Led the development of encrypted messaging app, improving encryption speed by 2x and strengthening security protocols.
  • Designed and implemented 30+ features, including advanced UI and reactive local data storage.
  • Drove the development of a shared Rust library, significantly improving performance. Achieved 2x faster encryption and decryption speeds. Integrated Rust code into the iOS app and assisted with Android integration.
  • Mentored iOS developers and actively collaborated with other teams, providing feedback, solutions, and planning cross-team initiatives to improve product quality.
  • Created technical documentation and actively collaborated with cross-functional teams to architect complex decentralized data systems.
Skills: Swift, Objective-C, UIKit, SwiftUI, Realm, Rust, Cryptography, Socket, Protobuf

Remote iOS developer

AppeProPo, Inc.
May 2016 - Today (on-demand maintenance)

  • Launched Appy Couple and Appy Life iOS apps from scratch, achieving 500K+ downloads, 40K monthly active users, and a 4.8/5.0 rating.
  • Designed and implemented a complex UI with over 50 screens, in-app editor, 1000+ design templates and robust offline data storage, reducing server costs.
  • Built an offline data cache with CoreData, developed a network sync layer, enhanced UX with animations, contributed to UI/UX decisions, and mentored team members.
Skills: Objective-C, Swift, SwiftUI, REST, CoreData, Apple Subscriptions, Dependency Injection, Push Notifications

Remote iOS developer

Toptal, LLC
Mar 2014 - May 2016

  • As a contractor for several US-based companies, I have experience creating iOS apps from scratch as well as improving and providing support for existing apps.
  • My past projects include building a dating app iOS platform and producing several niche apps based on this platform.
  • I have also worked on a team of 6 developers to maintain and improve a medical diary app.
  • Overall, I have a strong understanding of the process of building and maintaining iOS apps and am able to deliver high-quality results for my clients.
Skills: Objective-C, Swift, Node.js, REST, CoreData, SQLite, Apple Subscriptions, Push Notifications

iOS/JS developer

Enaza
Sep 2013 - Dec 2013

  • I have extensive experience working on an iOS app for interactive books. This app allows users to read and interact with digital books in a way that enhances their reading experience.
  • In addition to developing the iOS app, I also contributed to the creation of a web platform for authors and publishers to create and publish their own interactive books. This platform provides a user-friendly interface for designing and uploading digital content, making it easy for anyone to create interactive books.
Skills: Objective-C, Node.js, MongoDB, JavaScript, TypeScript

Software developer

JSC Prognoz
Feb 2009 - Aug 2013

  • I was responsible for designing, building, and maintaining systems for collecting, loading, processing, analyzing, and outputting data.
  • I also managed databases and worked on optimizing and administering them.
  • In addition, I developed several in-house iOS applications for government organizations and created iOS app prototypes.
  • I also provided technical writing support and communicated with customers, as well as contributing to project management, mentoring, and supervision.
Skills: MSSql, C#, Asp.Net, PHP, JavaScript, Objective-C

Education

Perm College Of Technology and Chemistry

Sep 2005 - Jun 2009
Software development

Perm National Research Polytechnic University

Sep 2010 - Jan 2012
Information Technologies and Computer-Aided Systems

Web apps

In addition to my experience with iOS app development, I have also developed several web projects including budget organizations, rich internet applications, and landing pages.

Known technologies:
  • HTML / HTML5
  • CSS
  • JavaScript / JQuery / Backbone
  • MSSQL / MySQL
  • Node.js
  • PHP
  • Asp.Net / C#
  • MongoDB
  • XML / JSON / SOAP

Browser extensions

I have experience developing browser extensions for Firefox, Google Chrome, and Safari. I have also published my own Google Chrome extension on the Chrome Store.

Known technologies:
  • JavaScript
  • Google Chrome Extensions API
  • Social network APIs
 
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