Данил

DANIL KASIANENKO
Location: Kiev, Ukraine (Remote, Relocate)
Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
E-Mail: [відкрити контакти](див. вище в блоці «контактна інформація»)
LinkedIn, Telegram

Frontend Engineer
Product oriented Frontend Engineer with 5+ years of experience building production-grade mobile and web applications using React,
React Native. Masters degree in CS. Delivered 10+ B2C products. Lead the team of 7+ people.
Great communicator with strong product mindset - being a good bridge between business and development to align technical
execution with strategic goals. I maintain a research-oriented approach, continuously exploring new mobile APIs, native integrations
(Live Activities, biometrics) Im taking full ownership over tasks, responsible for architecture, performance optimization and CI/CD
setup. SEO and cross-platform delivery. Evolved from hands-on engineer to team lead, mentoring others while driving scalable
solutions. Committed to quality, autonomy, and creating smooth, resilient user experiences.

TECH STACK
Frontend: React, React Native, Expo, SwiftUI, ObjectiveC, C++, Next.js, TypeScript, JavaScript (ES6+), Websockets, Skia,
Reanimated, Styled-Components, HTML5, CSS, SCSS, Tailwind CSS,
Backend: NodeJS, Express, Reddis, SQL, NoSQL, MongoDB, Firebase, Apollo Client (GraphQL)
State & Data Management: Redux, Redux Toolkit, Zustand, React Query, REST (Axios), React Hook Form, Formik, Zod
Architecture & Patterns: Feature Sliced Design, Atomic Design, SOLID, OOP, KISS, DRY, YAGNI
Mobile & Web3 Integration: Web3, OpenSea API
Testing & Quality: Jest, React Testing Library, Flashlight, Reassure
CI/CD & DevOps: Fastlane, TestFlight, Google Play, Maestro, Vercel, GitHub Actions, NPM
Monitoring & Analytics: A/B testing, Amplitude, UXCam, Google Analytics, Sentry, Firebase
General: IaP flows, Algorithms and data structures, OOP, design patterns, App Store Connect, Google Play Developer Console

WORK EXPERIENCE
React, React Native, Next.js Engineer Nov 2022 – Present
Remote, Ukraine
Requestum
Project 1. South Sydney Rabbitohs (B2C, Sports Fan Engagement App)
Sole React Native Engineer — 3-year ownership of end-to-end mobile development

Key Impact:
Delivered a highly-rated sports application 0 → 10k+ daily users, serving as the digital hub for Rabbitohs fans — covering
schedules, news, match stats, live coverage, and personalized content.
Automated CI/CD release flow — reduced build time by 75%.
Implemented automated performance monitoring — maintained stable 60 FPS across the app.
Established scalable architecture, robust release automation, and smooth native-level performance with minimal team support.
Integrated multiple analytics tools — enabled tracking of user interactions and behavior insights.

Expirience
Created a custom native module to display real-time match data (score, last event, period) via Live Activities — enhancing second-
screen engagement during games.
Connected the app to external content systems (Braze, Storyteller), user analytics (Google Analytics, UXCam), and crash tracking
(Sentry). Implemented complex deep linking (internal news, video, player profiles) and universal links to the official website.
Designed and implemented a fully automated CI/CD pipeline via Fastlane, covering linting, code style, certificate handling, and
multi-environment builds. Integrated Maestro for performance regression checks during builds.
Solely responsible for designing and building the React Native codebase from scratch, following Atomic Design and modular
principles. Developed for multi-device support (phones and tablets), including layout adaptation and responsiveness.
Led the full development lifecycle of the official mobile app for South Sydney Rabbitohs — one of Australia's leading NRL teams —
delivering a high-performance, content-rich fan platform available on both iOS and Android tablets and phones.
Proactively ensured 60 FPS performance by profiling bottlenecks using react-native-bundle-visualizer, Flashlight, React DevTools,
and release-profiler. Built custom tab navigators and reworked layouts to eliminate jank.
Managed the entire release lifecycle, from preparing visual assets and metadata to handling store rejections. Resolved complex
Apple compliance issues, including user deletion flows, via stakeholder negotiation and redirect implementation.
Worked closely with designers and the Storyteller content team, proactively suggesting design optimizations to ensure visual
performance, usability, and UX consistency. Participated in 30+ iterations with design stakeholders.
Poject 2. DIM9000 ( React Native Engineer — 6-month contribution within 3-person engineering team )

Key Impact:
Integrated IAP flows — enabled seamless bill payment transactions
Created multi-environment workflow — simplified releases and app testing.
Delivered critical features that enabled DIM9000 to transition away from fragmented offline service workflows toward a
centralized digital ecosystem for residential interaction.
Acted as a cross-functional contributor, balancing UI precision, API integration, and platform compliance — enhancing both UX
and internal dev velocity.

Expirience
Integrated In-App Purchase (IAP) flows for bill payments, enabling secure and seamless transactions within the app to enhance
user convenience.
Set up environment separation using react-native-config to support dev, staging, and production configurations — ensuring
reliable builds, consistent behavior, and smooth testing pipelines.
Integrated secure authentication via Face ID and fingerprint using react-native-biometrics, improving app onboarding and session
experience.
Built a modern utility and service management mobile app for residents of the DIM9000 real estate complex — a B2C solution
enabling tenants to manage property-related services, payments, requests, and notifications in a single platform.
Enabled seamless user experience for multiple locales by integrating i18n, making the product accessible to a diverse tenant base.
Leveraged Skia and react-native-reanimated to add smooth UI transitions and custom animations to key screens (dashboards,
modals, interactions), elevating user engagement.
Integrated advanced analytics stacks — Amplitude, Firebase, Google Analytics — to monitor user flows, retention, and behavioral
data. Configured Sentry for real-time error tracking.
Built a flexible deep link routing structure to support specific in-app navigation from external sources (e.g., push notifications
opening to specific announcements or request status pages).
Owned app release cycles and manual deployment via Google Play Console and Apple App Store. Managed build configs and
certificates, ensuring release readiness and versioning control.

Project 3. Kinetic.xyz (B2C, NFT Marketplace Aggregator & Web3 Wallet)
Frontend Tech Lead (Web + Mobile) — 8-month engagement on a large-scale crypto product

Key Impact:
Set up scalable, reusable libraries and tech — enabled separate React Native and web app development.
Participated in full release process — delivered critical features including buy/sell, tokens/NFT, login flow, CI/CD, and testing.
Enabled Kinetic to ship a performant, Web3-native NFT trading interface faster than competing platforms — with wallet
connection UX exceeding OpenSea and Blur in reliability and scope.
Positioned the frontend team for rapid scaling with a modular codebase, robust testing, and real-time Web3 feedback loops.

Expirience
Oversaw frontend development for Kinetic.xyz — an advanced Solana & Ethereum-based NFT aggregator that unified listings from
platforms like OpenSea, Blur, and Coinbase. Delivered both web and mobile interfaces enabling seamless wallet interactions,
trading, and portfolio management for retail crypto users.
Led the setup of both mobile and web projects, including repo structure, CI/CD, tech stack selection (Next.js + React Native), and
architectural decisions. Coordinated frontend delivery across distributed teams in Ukraine and the US.
Designed and implemented a reusable Wagmi-based wallet integration layer supporting WalletConnect, MetaMask, Coinbase
Wallet, Binance, OKX, and other Ethereum-compatible providers. Abstracted auth logic and ensured cross-platform consistency.
Built features for listing creation, NFT purchase flows, and order aggregation. Integrated deeply with Solana and Ethereum chains
as well as external APIs like OpenSea and Blur. Used Apollo GraphQL for backend communication.
Created real-time charts and dashboards using Skia for mobile and Nivo.js for web. Visualized NFT pricing, portfolio trends, and
liquidity data.
Enhanced discoverability through semantic HTML, dynamic metadata per route, sitemap generation, robots.txt configuration, and
Google Lighthouse compliance — critical for organic user acquisition in a competitive Web3 space.
Configured Vercel for automatic deployments. Each pull request triggered unit/integration tests, type checks, code linting, and a
temporary preview URL for QA and product review.
Regularly led sprint-end client demos. Consolidated progress from 7+ frontend developers, crafted structured walkthroughs, and
handled ad-hoc feedback. Maintained clear communication between QA, PM, and stakeholders.
React & React Native Engineer Nov 2021 – Nov 2022
Remote, Ukraine
Malevich
Worked across 4 diverse B2C mobile and web projects (finance, lifestyle, event tech) as a React/React Native developer, led the
development of a mobile app from scratch, including architecture, planning and team coordination of 3 people.
Delivered features end-to-end: from scoping and architecture to coding, testing, and release.

Key Outcomes:
Led and managed Burduck project — guided 3 developers from scratch to successful release
Created RN project template — reduced setup time for new apps.

Expirience
Used React Native CLI & Expo, TypeScript, Redux, Styled-Components, Apollo GraphQL, REST (Axios), Reanimated, Sentry,
Firebase.
Set up builds for TestFlight and Google Console; handled manual QA coordination.
Planned and delegated tasks for teammates; mentored junior devs via code reviews and onboarding support.
Took initiative in shaping technical solutions, choosing libraries, and refactoring legacy code when needed.
Communicated with PMs during grooming, sprint planning, and stakeholder handoffs.M)
Project Portfolio:
Burduck – Internal event management app. Designed app architecture, built real-time chat, integrated Apollo GraphQL, led 3
developers.
Simplewealth – Financial platform. Implemented auth flows, charts, dashboards, and REST API integration with secure session
management.
HappyHamster – Goal-tracking app. Built animated charts using Reanimated & Gesture Handler; contributed to Apollo GraphQL
integration.
Wisher – Gift registry app. Developed gift list logic, UI, and backend integrations in React Native.

Frontend React Engineer May 2021 – Nov 2021
Sumy, Ukraine
Tsukr.tech
Worked as the sole frontend developer on an early-stage startup building a lightweight CRM system and several landing pages.
Contributed end-to-end to UI design implementation, business logic integration, and collaboration with backend and product
stakeholders.

Key Outcomes:
Built an entire admin interface solo, from architecture to mobile responsiveness, improving the client’s internal operations.
Demonstrated ownership in a lean setup by designing, coding, and delivering full frontend solutions without direct supervision.

Expirience
Fully owned the development of a React-based internal CRM admin panel, including user authentication, dashboards, forms, and
data tables.
Integrated with REST APIs built in PHP; handled Axios-based requests and dynamic content rendering.
Implemented state management using Redux and built form logic using Formik with custom validation logic.
Developed responsive UI for landing pages (e.g. electrofarfor2000.com), including embedded maps and mobile-first layouts.
Used Material UI to accelerate UI development; built reusable components with TypeScript.
Participated in in-person team meetings to plan features, resolve blockers, and align on priorities.
Worked closely with the backend developer and internal product manager to ship functional features on tight timelines.
Delivered production-ready code handed off to the backend team for deployment and hosting.

Tech Stack: React, Redux, TypeScript, Axios, Formik, Material UI, REST API (PHP backend)

Publications
Sep 2024 – React Native Live Activities: A Simple Guide to Implementation (This step-by-step guide walks you through integrating
iOS Live Activities into React Native applications. With iOS 17 enhancements, discover how to make your apps more interactive with
real-time notifications and seamless user experiences.)

Awards
Aug 2022 – Frontend | DEV Challenge XIX (took 15th place in the European largest IT competition)
Certifications
Node JS: Advanced Concepts
React Native Performance Optimization Course
Graph Developer - Associate
React with TypeScript
The Complete Modern TypeScript Course

EDUCATION
Sumy State University, Ukraine, Master’s Degree in Computer Science, 2023 - 2025
Sumy State University, Ukraine, Bachelor’s Degree in Computer Science, 2019 - 2023

LANGUAGES
English - B2, Ukrainian - Native