Andrei Klopov

React Native Developer @ The Vault

About

I’m a Senior React Native Engineer and Mobile Architect with experience building scalable, high-performance mobile applications across fintech, consumer products, and high-load systems.I specialize in end-to-end mobile development - from architecture and system design to delivery and production support. My focus is on building reliable, maintainable, and scalable applications with strong performance and clean architecture. In recent projects, I’ve been working on secure platforms involving cryptography, transaction security, and protection of sensitive data. At the same time, I’ve contributed to large-scale consumer applications with millions of users, improving performance, reducing bundle size, and building shared architectures. Previously, I worked as a Development Lead, managing teams, improving engineering processes, and delivering complex products across multiple markets. My core expertise includes: • React Native, TypeScript, mobile architecture • Scalable applications and performance optimization • Secure systems, cryptography, and data protection • CI/CD, release processes, and production stability I focus on practical engineering - delivering robust products without overengineering, while keeping development fast and efficient. Before transitioning into software development, I spent 10 years as a police investigator - a background that shaped my problem-solving mindset, attention to detail, and ability to operate in high-pressure environments.

Country

Cyprus

City

Paphos

Industry

Information Technology & Services

Skill

ClickUp, Jira, gRPC, iOS Development, React, Управление командой, Оценка проектов, Техническое обучение, Java, Android, ООП, Git, SQL, JSON, XML, React Native, React.js, Redux.js, TypeScript

Experience

React Native Developer

The Vault

2025-3 - Present · 1 yr 7 mos

Limassol, Cyprus

Worked on secure mobile platform development, focusing on cryptography, transaction security, and high-reliability systems. • Development and launch of a mobile application with secure transaction flows and sensitive data protection • Designed and implemented cryptographic solutions (digital signatures, key management) for blockchain transactions • Built secure data handling mechanisms (DEK-based encryption) • Contributed to backend-integrated features using C++/Kotlin for enhanced security • Set up CI/CD pipelines, improving release speed and stability

Development Lead

Futurus Services LTD

2024-4 - 2024-12 · 9 mos

Limassol, Cyprus

Led development of web and mobile applications for fintech products across multiple markets, managing a team of engineers. • Managed and mentored a team of 3 developers, ensuring consistent delivery and code quality • Led migration from legacy stack to TypeScript, React, Next.js, and React Native • Architected scalable application structure, improving performance and maintainability • Improved development processes, testing, and documentation standards • Participated in hiring and technical interviews

React Native Developer

Muse Group

2022-1 - 2024-1 · 2 yrs 1 mo

Cyprus

Worked on large-scale consumer applications with millions of users, focusing on performance and architecture. • Improved app loading performance by 30% and reduced bundle size by 80% • Contributed to shared architecture and component system across products • Optimized application scalability and runtime performance • Delivered cross-platform mobile applications (iOS & Android)

React Native Developer

Heartify Inc.

2021-7 - 2021-12 · 6 mos

St Petersburg City, Russia

Built and launched mobile applications with full-stack involvement, including backend and mobile features. • Delivered two mobile applications end-to-end (frontend + backend) • Implemented camera-based pulse detection using CameraX and OpenCV • Integrated in-app purchases and analytics (RevenueCat) • Set up CI/CD pipelines for faster and more stable releases

React Native Developer

Noveo Group

2019-6 - 2021-7 · 2 yrs 2 mos

Saint Petersburg Metropolitan Area

Worked on multiple projects, including media applications and internal tools. • Developed music player functionality for a Spotify-like application • Built internal tools for resource and meeting management • Created Apple Watch app (Swift + React Native) • Participated in pre-sale technical evaluations

Android-разработчик

Upwork

2018-4 - 2019-6 · 1 yr 3 mos

St Petersburg

Delivered multiple applications independently and in small teams. • Developed e-commerce, delivery, and messaging applications • Built and maintained Android and React Native apps • Worked directly with clients and handled full development lifecycle