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Andrey Karpenko
Senior Software Engineer | React Native & Full-Stack
[open contact info](look above in the "contact info" section) | LinkedIn | Telegram: @obsidianuser92
Ukraine | Open to remote

SUMMARY
Senior Software Engineer with 9+ years of experience building React, React Native, and Node.js applications across finance,
healthcare, banking, and sports. Shipped 6+ apps to App Store and Google Play, led developer teams and technical delivery,
and owned architecture (FSD/DDD), CI/CD, and production releases for web and mobile products.

SKILLS
Frontend: React, React Native, TypeScript, JavaScript, Redux / Redux Toolkit / Redux-Saga, React Query, React Router, React
Navigation, HTML5, JSX
Backend: Node.js, NestJS, Express, Koa, GraphQL, REST APIs, WebSockets, Socket.io
Data: PostgreSQL, MongoDB, TypeORM, Prisma, Mongoose
DevOps & Release: Docker, GitHub Actions, GitLab Actions, Fastlane, App Center; App Store & Google Play publishing
Testing: Jest, React Testing Library, React Profiler, Lighthouse
Architecture: Domain-Driven Design (DDD), Feature-Sliced Design (FSD), GRASP, Nx monorepos, micro-frontends
Mobile & Integrations: Native modules (iOS/Android), offline-first (PowerSync, SQLite, WatermelonDB), OAuth, Firebase, AWS,
Sentry; push notifications (FCM, OneSignal)

EXPERIENCE
Freelance - Independent Contractor Feb 2025 - Present
Full-Stack Developer
Project: NDA - B2C social network with marketplace features
- Built a full-stack platform from scratch using React, TypeScript, NestJS, PostgreSQL, TypeORM, and Docker; designed
service boundaries, data models, and application architecture (FSD/DDD).
- Delivered end-to-end front-end and back-end features, including real-time messaging via WebSockets and AWS-backed
services for core social and marketplace flows.
- Established CI/CD with GitHub Actions and unit testing with Jest as the sole engineer owning the initial product foundation.
Mobile Developer (React / React Native) Nov 2025 - Present
Project: Phoenix (Accompany Health) - field care app for patient home visits | Live app: Google Play
- Developed a secure healthcare web and mobile app for clinical field teams, with offline-first visit documentation (PowerSync,
SQLite), background geolocation, and App Store / Google Play releases.
- Enabled reliable care workflows in low-connectivity environments; supported production delivery through CI/CD automation,
bug fixes, and cross-platform feature work (TypeScript, Context API).
Web / Mobile Developer Nov 2025 - Mar 2026
Project: Trusted Boaters - boater safety & community platform | Live app: Google Play
- Delivered offline-first mobile and web features with background geolocation, Google Maps integration, and store releases for
a public safety product.
Israel IT
Web / Mobile Engineer (React, React Native) Feb 2022 - Feb 2025
Project: Trade PLUS - trading / investing platform | Live app: App Store
- Built and maintained trading platform features for web and mobile over 3 years using React, React Native, Redux Toolkit,
TypeScript, WebSockets, Victory charts, Firebase, and AWS.
- Owned native iOS/Android module improvements for a production finance application serving real-time market data and
investing flows.
- Led code reviews and release processes, managed CI/CD, and supported App Store / Google Play delivery throughout the
product lifecycle.
React Native Developer Sep 2021 - Feb 2022
Project: Cookz (MVP) - social network for food enthusiasts (MVP, store release)
- Built a greenfield React Native application from scratch, including CI/CD setup and App Store / Google Play publishing.
Svitla System
Lead / React Native Developer Jan 2021 - Sep 2021
Project: FlatsOrSpikes - sports meet management platform | Live app: Google Play
- Led React Native development on a greenfield sports platform; owned implementation, code reviews, and CI/CD for split-time
tracking and meet organization.
CHI Software
Lead / React Native Developer Jul 2020 - Jan 2021

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Project: NDA (MVP) - IoT thermostat control application
- Built a greenfield mobile app from scratch with React Native and Firebase; integrated IoT devices over HTTP and local
network APIs.
React Native Developer Mar 2020 - Jul 2020
Project: NDA - sports app with nutrition/training recommendations and social community
- Delivered new features and production support using React Native, TypeScript, Firebase, and GraphQL.
SmartIT
Web / Mobile Engineer (React, React Native) Nov 2019 - Mar 2020
Project: Digital 2.0 - mobile and web banking | Live app: Google Play
- Delivered features for a customer-facing mobile banking product using React Native, Redux, and Socket.io; led a feature
workstream coordinating delivery across a multi-team banking project.
- Supported CI/CD, code reviews, and production quality for a regulated finance application.
Web / Mobile Developer Nov 2018 - Nov 2019
Project: HostelPass - hostel booking service across Europe
- Built a React Native and React application from scratch with Stripe payments, Firebase, and OpenStreetMap; managed
CI/CD and store publishing.
Full-Stack Developer Oct 2017 - Nov 2018
Project: LoveThisPlace - volunteer & nonprofit event matching platform
- Maintained and extended a full-stack MERN application (React, Redux, Node.js, Express, MongoDB, Socket.io).

EDUCATION
Dnipro National University of Railway Transport - System Software (Sep 2014 - Jun 2017)
LANGUAGES
English (B2-C1) | Ukrainian (native) | Russian (native)

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