Konstantin S.

Mode Software Inc. is a Canadian software company that specializes in privacy-focused communications, developing secure messaging and collaboration tools with advanced cryptographic systems.

• Created and maintained a secure messaging app that used post-quantum encryption, providing top-tier data protection for users.
• Implemented WebRTC-based voice and video calls, designing custom call interfaces and enhancing call stability and media quality.
• Integrated a shared Rust library used across mobile and desktop clients, ensuring strong encryption, serialization, and consistent storage.
• Collaborated with Android and backend teams to improve decentralized data storage and double encryption performance.
• Wrote detailed technical documentation, led release planning, and coordinated with QA to improve testing and deployment.

Appy Couple is a U.S.-based technology company providing a customizable wedding and event management platform via web and mobile apps.

• Led the development of the Appy Couple and Appy Life iOS apps from concept through release, achieving over 500K downloads and a 4.8/5.0 rating on the App Store.
• Created complex UI components with an in-app content editor and more than 1,000 customizable templates for event pages.
• Built robust offline data storage systems, reducing server load and enhancing user experience.
• Improved app performance and memory management, significantly increasing responsiveness and stability across multiple iOS versions.

Toptal is a global network connecting top freelance developers, designers, and engineers with clients worldwide.

• Delivered over 10 iOS applications from scratch for U.S. startups and mid-sized companies, covering design, implementation, and deployment.
• Created a dating app platform and multiple white-label apps based on it, enabling faster client rollouts and modular customization.
• Worked as part of a six-developer team to maintain and improve a medical diary app, enhancing data synchronization and reliability.
• Supported existing apps with updates, new features, and App Store maintenance.
• Guided clients on App Store compliance and CI/CD pipeline setup.

Enaza is a digital content distribution company that develops e-publishing solutions and media applications for interactive content.

• Created an interactive iOS reading app with dynamic animations to boost user engagement with digital publications.

• Partnered with web developers to design a cross-platform book creation tool for authors and publishers.

• Developed custom JavaScript bridges between the app and web editor for real-time content synchronization.

• Enhanced rendering performance for image-heavy pages and text-to-speech modules.

JSC Prognoz is a global BI company specializing in data analytics, visualization, and government information systems.

• Automated financial data uploads and validation for over 9000 accounting firms, increasing processing accuracy and reducing manual effort.

• Designed and optimized databases for government finance divisions.

• Created data visualization dashboards for internal use, enhancing accessibility to statistical information.

• Collaborated with analysts and QA teams to ensure reliability and compliance with internal data standards.