Kamil D.

About

Senior React Native Developer with 8 years of experience building high-quality mobile applications for fintech, healthcare, government, transit, and blockchain sectors. Proven team leader who delivered apps from scratch to production. Skilled in TypeScript, Swift, Kotlin, and cross-platform architecture. Passionate about clean code, performance optimization, and seamless user experiences across iOS and Android.

Top skills

Verified by Pangea.ai due diligence

Top Skills	Current Usage	Seniority
Mobile Development	20%	8 years
React Native	40%	8 years
System Architecture	20%	4 years
TypeScript	10%	4 years
Performance Optimization	10%	8 years

All skills

Roles and tools, to bring ideas to life and create meaningful experiences

Mobile Apps

HR Platforms

Blockchain & Crypto

Enterprise Software

Banking & Trading Platforms

API

Professional experience

Explore a curated selection of projects highlighting Kamil D.'s expertise and experience. Each project aims to showcase challenges, solutions, and the final outcome, along with the tools and technologies used.

Healthcare Booking Platform Mobile App project preview

ZnanyLekarz (DocPlanner) — Healthcare App

Healthcare Booking Platform Mobile App — Senior Mobile Developer

Improved a leading healthcare booking platform used by millions of patients. Implemented new features, fixed bugs, and improved code quality and eslint rules. Developed native components, implemented real-time chat functionality, upgraded native dependencies to higher versions, and migrated existing users to the newest app version with the chat feature. Stack: Objective-C, Groovy, React Native, TypeScript, JavaScript, Jest, Firebase, React, Redux.

Objective-C

React Native

TypeScript

JavaScript

Jest

Mobile Banking Application project preview

JPMorgan Chase — Mobile Banking App

Mobile Banking Application — Senior Mobile Engineer

Developed and maintained a mobile banking application for one of the world's largest financial institutions. Built with React Native and TypeScript, integrating a GraphQL API layer for efficient data management. Implemented comprehensive testing with Appium and Jest to ensure reliability and security in a highly regulated fintech environment. Ensured high code quality standards and collaborated with distributed teams. Stack: React Native, TypeScript, Swift, Kotlin, GraphQL, Appium, Jest, Detox.

Mobile Apps

React Native

TypeScript

Swift

Kotlin

Mobile Application — Full Lifecycle Development project preview

Fixvi Inc

Mobile Application — Full Lifecycle Development — Mobile Team Leader

Led the creation of a mobile app from scratch, guiding it through the full development lifecycle to successful release. Managed cross-team collaboration, ensured adherence to industry best practices, and calculated risks meticulously. Delivered a high-quality, robust app including native modules while maintaining a dynamic development environment. Stack: React Native, TypeScript, Swift, Kotlin, React Navigation (Native Stack), Axios, React Query, React Context API, Formik, Yup, i18next, Sentry, Expo Modules, Jest, Detox, Reanimated, Valtio.

React Native

TypeScript

Swift

Kotlin

React-query

Preferred tools

View the preferred tools and apps used by Kamil D. to assess compatibility and alignment.

Figma

Firebase

Git

Github

Gitlab

Jira

Notion

Slack

Career highlights

Discover Kamil D.’s professional journey, including employment history, certifications, and educational background.

Senior Mobile Engineer

JPMorgan Chase & Co.⸺2023 - 2024

Developed and maintained mobile banking application using React Native with TypeScript. Integrated GraphQL API layer, implemented testing with Appium and Jest, and ensured high code quality for financial services. Tech: React Native, TypeScript, Swift, Kotlin, GraphQL, Appium, Jest, Detox.

Mobile Team Leader

Fixvi Inc.⸺2023 - 2023

Led creation of a mobile app from scratch to release. Managed cross-team collaboration, kept project aligned with best practices, calculated risks, and delivered a robust product with native modules. Tech: React Native, TypeScript, Swift, Kotlin, React Navigation, Formik, Jest, Detox, Reanimated, Valtio.

Senior Mobile Developer

Blaise Transit⸺2021 - 2023

Built on-demand transit platform with native map navigation (OSRM) for iOS and Android. Improved bus rerouting, worked on driver and passenger apps. Introduced TypeScript for platform stability. Tech: React Native, TypeScript, React Navigation, Axios, Sentry, MapBox, Swift, Objective-C, Kotlin.

Senior React Native Developer

Orange⸺2021 - 2021

Developed mobile features for one of Europe's leading telecom providers using React Native. Focused on delivering high-quality code and seamless user experience. Tech: React Native, TypeScript.

Mobile Developer

Entia Ltd⸺2021 - 2021

Built mobile solutions for a UK-based healthcare company. Developed features and maintained React Native applications. Tech: React Native, TypeScript.

iOS Developer

Booksy⸺2021 - 2021

Developed native iOS components using SwiftUI and Combine. Created proof of concept for brownfield integration of SwiftUI with React Native. Handled state manipulation and data transfer between native and RN layers. Tech: SwiftUI, Combine, Swift, Kotlin, React Native, TypeScript.

Mobile Developer

Versum.com⸺2020 - 2021

Integrated features into React Native apps (business and customer-facing). Used Apollo Client with GraphQL, wrote E2E tests with Detox, developed mobile subscriptions and payment modules. Tech: React Native, TypeScript, Apollo Client, Redux, GraphQL, Firebase, Jest, Detox.

Mobile Developer

ZnanyLekarz (DocPlanner)⸺2020 - 2020

Improved healthcare app with new features, bug fixes, and better code quality. Developed native components, implemented chat, upgraded dependencies, and migrated users to newest version. Tech: Objective-C, Groovy, React Native, TypeScript, Firebase, Redux, Jest.

Frontend Developer

NextApps⸺2019 - 2019

Developed mobile and web frontend solutions. Built React Native applications for various clients, working on Android and iOS platforms. Tech: React Native, JavaScript, TypeScript, React.

React Native Freelancer

Freelancer.com⸺2018 - 2019

Built cross-platform mobile apps with React Native for Android and iOS. Delivered freelance projects for various clients, gaining early professional experience in mobile development.

Testimonials

Anonymous

nomtek

Verified Testimonial

“Kamil joined us when the app was just an idea and turned it into a real product. He took full ownership of the mobile side — architecture, native modules, testing, release. What impressed me most was how he balanced speed with quality. He pushed back when timelines were unrealistic and always came with a plan. Communication was smooth even across time zones. I'd work with him again without hesitation.“

nomtek

Top skills

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Preferred tools

Career highlights

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