Михаил

MYKHAIL OVSIANNYKOV
React Native Developer | 5+ years experience
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section) | Poznan, Poland (GMT+2)

I offer 5+ years of hands-on experience in system design, development, shipping, and maintenance of
large-scale mobile and web products, having successfully delivered 10+ such projects. Additionally, I have
experience creating & leading teams and managing the entire development process, with 3+ successful
product deliveries as a Team Lead or Development Manager. I’m passionate about creating scalable,
high-performance solutions and enjoy mentoring teams to achieve outstanding the results

Specializations: React Native, React, JavaScript, TypeScript, Redux, HTML, CSS, Native Modules,
Expo, Android Studio, Xcode, Next, Node, Mobile Engineering, Front-End Engineering

PROFESSIONAL EXPERIENCE

Front-End Team Lead / Front-End Technical Manager
Pitch Avatar | Vienna, Austria (Remote) | Jan 2025 - now (Short-Term Сontract)

• Conducted a comprehensive team audit, optimised team structure by 20% based on performance and project needs
• Introduced scalable front-end architecture, improving development e ciency and maintainability
• Applied prompt engineering techniques to optimise frontend-side prompts for improved interaction with LLM
• Implemented feature ags and feature branches, enabling safe isolation of incomplete features and risk-free A/B
testing — resulting in a 40% increase in production environment stability
• Stabilised dev/stage/prod environments through the use of feature ags and adoption of git- ow, which led to a 60%
reduction in production incidents and a 30% acceleration in the release cycle
• Implemented a structured code review process, increasing code quality and reducing bugs by 30%
• Established code style guidelines and integrated linting tools to ensure consistency and readability across the
codebase
• Introduced unit testing practices with 30%+ code coverage, improving reliability and reducing regression issues
• Integrated Sentry for real-time error monitoring and debugging, signi cantly improving production issue response time
• Set up and led Scrum processes, reducing development cycle time by 25%
• Had made team training and mentoring, accelerating developers ramp-up time by 20%
• Reviewed and improved technical and project documentation to ensure consistency and clarity across teams
• Actively contributed to front-end and mobile development, delivering high-impact features on schedule

Senior React Native Developer / Mobile Team Lead / Development Manager
ARBIPAY | Bratislava, Slovakia (Remote) | Feb 2023 - Nov 2024

• Have successfully created and launched 3+ high-scale projects
• Con gured all business processes to create an application from scratch, to publication and support
• Established interaction between departments during the development of mobile applications
• Managed the team
• Managed the tasks
• Was building frontend and mobile apps architecture
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 • Code review and mentoring

React / React Native Developer
HELIOTROPE DIGITAL | London, UK (Remote, Short-Term Contract) | Nov 2022 - Feb 2023
Developing high-load CRM system with market-disrupting innovations
• Led the mobile application development process
• Was building frontend and mobile apps architecture
• Was part of a nimble front-end team that launched a fully-featured CRM system in less than six months

React / React Native Developer
MEMCRAB | Vinnitsa, Ukraine | Mar 2022 - Jan 2023
Building a large-scale Tasks-Management System and big E-Commerce store
• Developed a successful MVP of a high-load mobile application in six months
• I'm was expanded and improved the middle level functionality in the large application.
• I was part of the front-end team with whom he worked on the web version

React Native Developer
ISQUAD | Kharkiv, Ukraine | Oct 2021 - Feb 2022

• Successfully identi ed and resolved technical issues in a mobile application, reducing incident response time and
improving overall product stability.
• Implemented an improvement to the application code that resulted in increased performance and reduced load on
device users, which in turn limited the overall user experience.
• Implemented new features that adhered to deadlines and coding standards, resulting in increased application
functionality and a consistent user experience

Lead Full-Stack Developer
G-OONE STUDIO | Kharkiv, Ukraine | Aug 2020 - Oct 2021

• 20+ successfully implemented projects of varying complexity
• Implemented a process for versioning projects and current code
• Developed designs for 5+ projects
• Code review and mentoring

Full-Stack Developer
FREELANCE | 2019 - 2021
• 50+ successfully implemented projects of varying complexity
• Covered the full development cycle, from concept and design to deployment and support, providing customers with
reliable and innovative solutions
• Implemented e ective strategies and tools that resulted in increased productivity and quality of projects, improving
customer satisfaction and reducing development time
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 PROJECTS

Swift Surf
ARBIPAY
Team size: 4
Role: Team Lead
Description: Mobile Browser
Link: https://play.google.com/store/apps/details?id=com.swiftsurf
Stack: Typescript, React Native, React, Next, MySQL, Postman, Zustand, React Navigation, Zod, MUI, i18next, Xcode, Android
Studio, Swift, Kotlin, Firebase, Push-Noti cations, Sentry, AppsFlyer, Git, Bitbucket, Jira, Figma

ARBIPAY
ARBIPAY

Team size: 12
Role: Team Lead
Description: Online Banking
Link: https://arbitaspay.com/
Stack: Typescript, React Native, React, Zustand, React Navigation, React Query, React Hook Form, Axios, Zod, i18next, Firebase,
Push-Noti cations, Google Maps, Deep Linking, AWS S3, Xcode, Android Studio, Swift, Git, Bitbucket, Jira, Figma

MINEREX
ARBIPAY
Team size: 4
Role: Team Lead
Description: Cloud Mining
Link: https://play.google.com/store/apps/details?id=com.miningmobile
Stack: Typescript, React Native, React, Zustand, React Navigation, React Query, Axios, Zod, i18next, Google Maps, Deep Linking,
Xcode, Android Studio, Swift, Git, Bitbucket, Jira, Figma

LIQUID CRM
HELIOTROPE DIGITAL
Team size: 22
Role: Front-End Developer / React Native Developer
Description: HR Service (Web & Mobile)
Link: https://www.heliotrope.digital/portfolio/web-mobile-development/liquid-crm
Stack: Typescript, React Native, React, Next, Effector-Next, React Navigation, Axios, i18next, Google Maps, Deep Linking, AWS
S3, Xcode, Android Studio, Swift, Git, Bitbucket, Jira, Figma

WORKSFLY
MEMCRAB
Team size: 8
Role: React Native Developer
Description: Jira Analogue (Web & Mobile)
Link: https://play.google.com/store/apps/details?id=com.work y
Stack: Typescript, React Native, React, React Navigation, Zod, i18next, Lingui, Docker, Firebase, Push-Noti cations, Deep Linking,
Xcode, Android Studio, Swift, Git, Bitbucket, Jira, Figma
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MEGASPORT
MEMCRAB
Team size: 16
Role: React Native Developer (Web & Mobile)
Description: E-Commerce
Link: https://apps.apple.com/ua/app/megasport-ua-fashion-store/id1388331213
Stack: Typescript, React Native, React, React Navigation, Zod, i18next, Lingui, Firebase, Push-Noti cations, Deep Linking, Xcode,
Android Studio, Swift, Jest, Docker, Git, Bitbucket, Jira, Figma

UDAZZY
FREELNACE
Team size: 5
Role: React Native Developer
Description: Social Network
Stack: Javascript, React Native, React, Redux, Mapbox, React Navigation, Yup, Formik, Xcode, Android Studio, Swift, Git, Gitlab,
Trello, Figma

EDUCATION

Master of Software Engineering
Kharkiv National University of Radio Electronics | Kharkiv, Ukraine | 2020-2023

Bachelor of Software Engineering
Kharkiv National University of Radio Electronics | Kharkiv, Ukraine | 2016-2020

LANGUAGES

English
Upper-Intermediate

Ukrainian
Native

Russian
Native

German
Pre-Intermediate

Polish
Elementary
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