Vitalii

VITALII
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TREBKO Ukraine, Kharkiv

GitHub
REACT / REACT-NATIVE @askard_go
DEVELOPER
PORTFOLIO

S KI L L S

JavaScript ReactNative Redux Thunk React-Reanimated
TypeScript React MongoDB Tauri
HTML/CSS/SCSS Socket.IO Scrum OOP
Node.js Redux/ReduxToolkit ThreeJS
Express.js/Fastify Zustand/Recoil Firebase

WORK EXPERI ENCE S UMMARY

Ambitious and results-driven web
AUG 2024 - SEP 2025 developer with over 5 years of
Join.To.It - Kyiv experience. Skilled in React Native
Mobile developer • ReactNative (2.5 years) and React (2.5 years,
including 1.5 years as a Fullstack
DRM & Secure Streaming: Integrated ClearKey DRM
developer with the MERN stack).
and designed secure content workflows; connected
Quick to adapt, eager to learn new
backend APIs and gained working knowledge of
technologies, and recognized for
Widevine and FairPlay.
delivering innovative, non-standard
Complex Form Systems: Built multi-step, validated
solutions to complex problems.
forms with animated transitions using React Hook
Form and React Native Reanimated.
Payments & Monetization: Implemented Google Pay, L ANGUAGES
Apple Pay, and Stripe SDK with backend
tokenization for secure transactions.
Motion & Animation: Delivered advanced UI/UX with English B2
Lottie, Reanimated v2, and Gesture Handler. Ukrainian (native)
Responsive & Adaptive UI: Developed scalable Russian (native)
layouts with Flexbox and Styled Components,
ensuring compatibility across multiple platforms
PORT F OL I O
and screen sizes.
Document & Media Processing: Created camera
flows with react-native-vision-camera, OCR Preview page:
previews, and API-based recognition. https://trebko.xyz
Performance & Optimization: Optimized apps with GitHub:
the Hermes engine, improved memory usage, and https://github.com/AskardGO
reduced bundle size via Metro optimizations.

CI/CD & Deployment: Automated builds and EDUCAT I ON
distribution using Fastlane, App Center, and
Firebase App Distribution; managed versioning and
release cycles. 2017 - 2021 [Bachelor]
KHARKIV PETRО VASILENKO
Additional Experience: Worked with Google Maps
NATIONAL TECHNICAL UNIVERSITY
API, background tracking using transistorsoft/react-
OF AGRICULTURE - MECHATRONIC
native-background-geolocation, FFMPEG, ThreeJS
Chip Firmware development
and structured architecture via FSD (Feature-Sliced
Automation of units
Design) with class-based and singleton
configurations.
2022 - 2023 [Master]
SEP 2023 - AUG 2024 SNAU - AGRICULTURAL ENGINEER
BN Digital - Kyiv
Integration of experimental units
Mobile developer • ReactNative into John Deere agricultural
machinery
Led the end-to-end development of cross-platform
Participation in the development of
mobile applications with React Native, ensuring
AI laser virtual guides for the
high performance, scalability, and consistent UX
automation of tractor operations
across iOS and Android.
Integrated Firebase (Authentication, Firestore, Cloud
2018 - 2019 [Additional]
Messaging) to enable secure user flows, real-time
EPAM UNIVERSITY
synchronization, and robust push notification
systems. Fundation of Manual testing (QA)
Designed and implemented a headless CMS Test automation with use Maven +
architecture using Strapi, empowering non- Java
technical teams to manage content seamlessly and C# base
reducing release cycles. SCRUM / KANBAN theory
Delivered secure and optimized payment solutions
with Stripe, supporting both subscriptions and one-
time transactions, resulting in improved checkout
conversion rates.
Enhanced user engagement by implementing
advanced notification workflows with Notifee,
including rich media and contextual notifications.
Optimized data handling by adopting GraphQL APIs,
minimizing over-fetching and improving app
performance.
Managed the build and release pipeline for both
platforms (TestFlight, Google Play Console),
introducing versioning practices that ensured
smooth rollouts and backward compatibility.
Contributed to release management and version
control strategy, maintaining stable production
environments while supporting iterative
development in agile sprints.
Acted as a key collaborator between design,
backend, and product teams, ensuring timely
delivery of features aligned with business goals.
Proactively identified performance bottlenecks and
applied best practices in mobile development,
improving app stability and reducing crash rates.

DEC 2021 - APR 2023
LechnerSoft - Kharkiv
Fullstack developer • MERN
Developed and maintained applications in the MERN stack (MongoDB, Express.js,
React, Node.js), delivering scalable web platforms and interactive user experiences.
Built and deployed cross-platform mobile apps with Ionic, ensuring seamless
performance across Android and iOS.

Key Projects:
JUDO Auster Forum & CRM
Designed and implemented a forum platform for the JUDO Auster
association, enabling community discussions and knowledge sharing.
Developed a custom CRM system for content moderation and editing,
allowing administrators to efficiently manage posts, user roles, and event
updates.
Ensured robust access control and secure data handling through optimized
backend logic.
Facebook Chat Game (Bot-based)
Engineered the backend using Express.js + MongoDB, implementing user
registration, validation, and authentication flows.
Integrated real-time communication with WebSockets and Socket.IO,
enabling live interaction between users and the game logic.
Built an admin dashboard for content and gameplay management: adding
new characters, editing attributes/stats, and updating sprite assets
dynamically.
Optimized system performance and scalability, ensuring smooth handling of
concurrent players in the chat-based environment.

Core Contributions:
Acted as a full lifecycle developer: from designing system architecture and
database schemas to frontend integration and deployment.
Improved maintainability by introducing modular code practices and clear
separation of concerns across backend and frontend layers.
Collaborated with designers and product stakeholders to align features with
business and community needs, delivering reliable and engaging applications.

DEC 2020 - DEC 2021
NerbLab
JavaScript developer • React • ThreeJS
Designed and implemented responsive page layouts with CSS, SASS (SCSS), ensuring
cross-browser compatibility and pixel-perfect execution.
Developed reusable functional components with React Hooks, improving
maintainability and scalability of front-end codebases.
Consumed REST APIs using Axios, optimizing data handling and state management.
Built visually engaging 3D elements and interactive icons in the browser with Three.js,
enhancing user interfaces with modern 3D experiences.
Created and optimized custom icon packs in Adobe Illustrator, delivering scalable
vector graphics tailored for UI/UX needs.
Leveraged modern UI libraries such as Ant Design, Material UI, and TailwindCSS to
accelerate development and ensure consistent design systems.
Applied TypeScript for type-safe, maintainable, and scalable React applications,
reducing runtime errors and improving developer productivity.