Оскар

OSKAR SAIENKO
Frontend Developer

CONTACT INTRODUCTION
[відкрити контакти](див. вище в блоці «контактна інформація») Frontend Developer with 2+ years of experience building and maintaining
Lviv, Ukraine production-grade mobile and web applications (React Native, Next.js, Vue/Nuxt).
[відкрити контакти](див. вище в блоці «контактна інформація») Experienced in monorepo architectures, SDK migrations, payment integrations,
652254 AI-assisted product development, and improving app stability in multi-app
github.com/osichan ecosystems.
t.me/osichan
WORK EXPERIENCE
LIVE PROJECTS
Frontend Developer - Confidential (NDA) May 2026 - Now
ta-planer.se - AI traffic-plan Remote
generator
● Built frontend features across multiple Vue/Nuxt products under NDA.
cheffo.org - food-tech platform
● Contributed to an AI product that takes a user's idea and runs it through a
SKILLS structured, multi-step analysis flow.
● Worked on an AI-powered generator for traffic control plans (TA-plans) for
Frontend: React Native, React, Swedish roadworks projects, including editable traffic signs/symbols on an
Next.js, Vue, Nuxt, TypeScript
interactive map, risk analysis, and pick-lists.
State Management: Redux
● Developed parts of a small CRM with distinct admin, contractor, and user
Toolkit, Zustand
roles and permissions.
Backend/Services: Firebase,
AWS, GCP Frontend Developer - Admiral Studios Jan 2026 - May 2026
Payments: Stripe, Revolut, Plaid Remote
Tools: Expo, Zod, NativeWind, ● Built and maintained financial integrations (Plaid, Stripe), including
Tailwind CSS, CI/CD (Codemagic, transaction processing logic and confirmation flows.
GitHub Actions) ● Kept financial data consistent across app state and asynchronous flows,
Mobile: Android SDK, Gradle, reducing edge-case bugs in transaction handling.
Kotlin, Xcode ● Optimized rendering and data handling for activity feeds and large
Familiar with: GraphQL (Apollo), transaction lists, improving perceived app speed.
SQLite, basic Kotlin/Android ● Refined UI/UX details in React Native components - text truncation, layout
(personal projects / coursework)
fixes, and state-driven rendering - for a more polished user experience.
LANGUAGES Frontend Developer - Linkup st Jun 2025 - Dec 2025
English - B2 Remote
Ukrainian - C2 ● Contributed to a large-scale food-tech ecosystem spanning a web client, two
Russian - C2 mobile apps (Customer & Chef), and two shared component repositories
(design system + UI library).
EDUCATION ● Maintained and extended a complex multi-app monorepo, keeping shared
libraries consistent across independent apps.
Lviv Polytechnic National
University
● Worked on payment integrations with Stripe and Revolut, including
confirmation flows and troubleshooting edge cases.
Bachelor's Degree, Computer
Science ● Led a full project modernization: upgraded to RN 0.7x, Gradle 8.x, Android
SDK 35, and newer Kotlin versions, fixing autolinking issues along the way.
● Diagnosed and resolved architecture-level issues - navigation, state
consistency, race conditions, native integrations - improving overall app
stability.
● Supported CI/CD pipelines, fixing build failures, environment
inconsistencies, and dependency conflicts.
Frontend Developer - Appexoft Dec 2024 - Jun 2025
On site
● Built mobile and web applications using React Native, Expo, Next.js, Redux
Toolkit, Firebase, and Zod.
● Implemented camera capture, voice input, and real-time geolocation
features.
● Built responsive, cross-platform UI with a focus on performance.
● Took apps from zero to store-ready, handling App Store and Google Play
submission and guideline compliance.

React Native Developer - Freelance Apr 2024 - Aug 2024
Remote
● Built advanced PDF generation, editing, and viewing functionality for a client
application.
● Implemented secure, AWS-based authentication.
● Collaborated closely with a distributed Ukrainian-American engineering
team.

React Native Developer - Startup Wombase Jul 2023 - Jun 2024
Lviv
● Built the mobile companion app for a large-scale ERP system, from scratch
to a production-ready APK.
● Owned the full cycle - design input, development, deployment, and
troubleshooting.
● Fixed runtime issues to keep the app stable across a range of devices.