Senior React Native Developer - Accessibility Specialist
Email: artur.kalach.andreevich@gmail.com · LinkedIn: linkedin.com/in/artur-kalach · Location: Krakow, Poland
Senior React Native Developer with 9+ years in software engineering and 6+ years in React Native, across both the JavaScript and native layers. At EPAM Systems, I deliver mobile apps for global clients in banking, insurance, healthcare, and retail.
Accessibility is one of my strongest areas. I author and maintain open-source React Native accessibility packages, and I know the iOS and Android accessibility layers and WCAG 2.1 in depth.
On the native side, I build modules in Swift, Objective-C, Kotlin, and Java — payments, push and marketing services, deep linking, and device features. I have also mentored developers, run interviews, and covered team-lead duties.
I am seeking a senior or lead React Native role with new technical challenges and ownership of delivery. Accessibility, native iOS and Android development, and performance optimization are core strengths I bring. I am also keen to expand into new domains and technologies.
- Cut screen load time by ~50% through profiling and performance work.
- Resolved every medium- and high-severity accessibility issue on a project using my own open-source packages.
- Built a custom GraphQL client to reduce network latency.
- Authored and released open-source React Native accessibility libraries used across production projects.
- Added New Architecture support with backward compatibility.
- Implemented full RTL/LTR language support.
- Integrated payments (Venmo, PayPal) and analytics (Firebase/GA4, Azure) through native modules.
I author and maintain accessibility-focused React Native packages:
- react-native-a11y-order — controls the reading order for screen readers.
- react-native-external-keyboard — full physical keyboard support.
- react-native-a11y — accessibility helpers and components.
Author of a "Digital accessibility" article series on LinkedIn for mobile developers. The series covers WCAG, assistive technologies, screen readers (TalkBack and VoiceOver), and React Native:
- What it is and why it matters
- Assistive technologies
- Mobile devices and assistive technologies
- React Native overview
- Screen reader behavior in mobile apps
Areas of expertise
- React Native internals — JavaScript and native layers, TurboModules, JSI, JNI, C++ bridge
- Accessibility — WCAG 2.1, iOS and Android accessibility APIs, open-source library authorship
- Native modules — iOS (Swift / Objective-C) and Android (Kotlin / Java)
- Performance — load-time reduction, custom network clients
- Architecture — New Architecture migration, backward compatibility
- Leadership — mentoring, onboarding, technical interviews, Scrum
Technical skills
| Category | Technologies |
|---|---|
| Core | React Native, React, TypeScript, JavaScript, Redux, GraphQL, Jest |
| Native | Swift, Objective-C, Kotlin, Java, TurboModules, JSI, JNI, C++ |
| Tools | Storybook, Firebase, Azure, Git, Jira, Confluence, Figma |
| Domains | Banking, Insurance, Retail & E-commerce, Grocery, Healthcare & Pharmacy |
- English: B2
Senior React Native Developer · Oct 2019 – Present
Delivering React Native apps for global clients across banking, insurance, healthcare, and retail. Selected engagements:
Jul 2025 – Present · Banking
A React and React Native monorepo modernizing a mobile banking experience for regulatory compliance.
- Consult on accessibility and deliver fixes across the app, and lead knowledge-transfer sessions for the team.
- Build reusable UI components and integrate native iOS and Android modules.
- Maintain and extend my own open-source npm packages to meet project requirements.
- Patch third-party libraries (Gesture Handler, Reanimated, React Navigation), and resolve security and performance issues across web and mobile.
Stack: React Native, React, TypeScript
Sep 2024 – Jun 2025 · Insurance
A cross-platform insurance solution with country-specific mobile apps and a shared web platform.
- Built features and fixed issues across web portals and country-specific mobile apps.
- Configured dynamic JSON/JSONata pages for flexible content handling.
- Improved analytics for accurate event tracking, and strengthened app security.
- Maintained shared UI components across multiple country builds.
Stack: React Native, React, TypeScript
Jan 2024 – Sep 2024 · Grocery & Retail
A re-platforming program: migration from native apps to React Native, with a white-label design system and A/B mechanics.
- Reduced screen load times and improved animation smoothness; refactored Apollo and built a custom GraphQL client.
- Configured OkHttp and image caching, integrated deep linking, and built a screen-brightness control module.
- Integrated Salesforce Marketing Cloud push and in-app messaging through custom native modules.
- Increased Jest coverage and resolved complex issues across the codebase.
Stack: React Native, React, TypeScript, GraphQL, Apollo, Salesforce Marketing Cloud, Jest
Apr 2023 – Nov 2023 · Retail
An in-store application with digital receipt features for a global retail group.
- Built internationalization with full RTL/LTR support.
- Integrated a shared internal framework and third-party services.
- Refactored code, resolved issues, and collaborated across teams in Scrum.
Stack: React Native, TypeScript, Redux, Jest, Firebase
Oct 2022 – Apr 2023 · Grocery & E-commerce
Continuous development of a grocery e-commerce mobile platform after MVP delivery.
- Updated the app to WCAG 2.1 A, and built reusable accessibility helpers and utilities.
- Integrated Venmo and PayPal payments with native modules (Swift / Kotlin).
- Implemented Firebase Analytics with GA4 e-commerce and custom event tracking.
- Onboarded and mentored junior developers, and led meetings.
Stack: React Native, TypeScript, Swift, Kotlin, GraphQL, Apollo, Firebase
Sep 2020 – Oct 2022 · Healthcare & Pharmacy
A platform to improve consumer access and experience in healthcare. Joined the project at inception.
- Configured project structure, navigation, TypeScript, Jest, and Fastlane scripts.
- Developed accessibility modules and components for WCAG compliance, in native Swift, Objective-C, and Java.
- Integrated Firebase push notifications, charts, and payment systems through native modules.
- Led interviews and onboarding, mentored junior developers, and covered team-lead duties (Scrum).
Stack: React Native, TypeScript, GraphQL, React Hook Form, Storybook, Firebase, Azure DevOps
Earlier engagements: a retail loyalty app (2025), an internal mobile proof-of-concept (2023), a retail e-commerce app built from scratch (2020), and a construction-sector web migration (2019–2020).
Full-stack Developer · 2017 – 2019
- Built a casting and modeling platform for show-business professionals end to end: architecture, server setup (Nginx, PHP, MySQL, Redis), business logic, a Vue/Vuex front end, an internal chat system, and payment integrations.
- Delivered several smaller web projects (news sites, landing pages, e-commerce shops) on WordPress, PHP, and Node.js.
Stack: Vue, Vuex, PHP, Laravel, MySQL, Redis, JavaScript
- 2017–2021 — Coursework in Information Technology and Software Development (no formal degree awarded)
- 2014–2017 — Vocational Specialized Education in Information Technology and Software Development
- 2011–2014 — Vocational Education in Operation and Maintenance of Electronic Computers