Sergii Koval

Senior iOS/macOS Developer with 15+ years of experience in mobile and desktop app development for Apple platforms. I was leading a digital transformation of a neobank application in Credit Dnipro bank. In addition, I have skills in integration of hardware with iOS and connectivity. Actively implementing different AI models in iOS, as well as MCP and Agentic workflows. Having advanced knowledge of UI/UX design and tools, like Photoshop and Figma, and being a graphic designer in the past, helped to shape the look and feel of products. Published myself numerous apps on the AppStore and negotiated rejections with Apple review team. Have minimal knowledge of Android, enough to make minor fixes and lead cross-platform development. Creator of Threat Explorer, a unique penetration testing tool for finding security vulnerabilities in iOS and macOS applications. Proficient in Swift, Objective-C, SwiftUI, and advanced technologies like MetalKit, CoreML, and ARKit.