Summary
Overview
Work History
Skills
Languages
Timeline
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Ivan Hassay

Krakow

Summary

As an accomplished React Native developer, I am deeply committed to crafting top-tier mobile applications that enhance user engagement and satisfaction. My career is marked by a consistent ability to lead multidisciplinary teams and spearhead the execution of complex functionalities that significantly improve app efficiency for a vast user base. My expertise in React Native is complemented by strong analytical capabilities and meticulousness, enabling me to elevate project quality and ensure timely completion. I am eager to leverage my extensive skill set to advance your team's objectives and propel your mobile development projects to unprecedented levels.

Overview

7
7
years of professional experience

Work History

React Native Developer

LG ThinQ Energy
05.2021 - 12.2023
  • I was part of the development of a scalable React Native application for smart home energy management, emphasizing seamless integration across multiple IoT devices.
  • Implemented OAuth2 for multi-service authentication, enabling users to access personalized energy data from various AI-enhanced services on different smart home devices.
  • Developed a modular application architecture to support generation with multiple domains, facilitating custom builds via Expo EAS, which enhanced deployment flexibility and speed.
  • Utilized AI API for sophisticated data aggregation and analysis, optimizing real-time energy usage monitoring and control.
  • Led a development team through complex project cycles, upholding high standards of code quality and ensuring performance across diverse operating environments.
  • Designed and implemented custom, complex visualizations of energy data using D3.js + Reanimated, providing users with detailed, interactive graphs that enhance understanding and engagement.

React Native Developer

NDA
06.2022 - 02.2023
  • Led the deployment of Kotlin Multiplatform across multiple endpoints, enhancing functionality and interoperability of financial applications.
  • Maintained 95% Jest test coverage on the React Native codebase, ensuring high reliability and quality of application features.
  • Implemented GraphQL to optimize data exchange processes, improving the efficiency of real-time financial transactions.
  • Operated within a Scrum framework, collaborating effectively in sprint planning, reviews, and daily scrums to meet project milestones.

React Native Developer

Crumbiz
10.2020 - 02.2021
  • Developed key features for Crumbiz, a mobile platform designed to maximize the potential of global business networks.
  • Implemented advanced React Native components to facilitate seamless interaction and management of professional connections.
  • Integrated social media APIs to allow users to import and synchronize contacts, enhancing the network building experience.
  • Collaborated with a multinational team to tailor user interface elements that cater to diverse user bases across various business sectors.
  • Ensured robust application performance and scalability to support growing user numbers and data intensity.

React Native Developer

The Next Web Solutions
05.2019 - 02.2021
  • Collaborated closely with a senior lead developer to enhance mobile application performance and user experience across Android and iOS platforms.
  • Implemented CodePush for direct updates to production environments, enabling rapid iteration and immediate deployment of features.
  • Developed robust CI/CD pipelines tailored for multiple backends, ensuring consistent, error-free releases through automated testing.
  • Integrated feature flags to manage application functionality for different levels of premium users, enhancing customization and user engagement.
  • Spearheaded the adoption of advanced development practices and tools, significantly improving code quality and project turnaround time.

React Native Developer

Light IT
07.2018 - 07.2019
  • Led the development of advanced cross-platform mobile applications using React Native, enhancing app functionality and user engagement.
  • Spearheaded the integration of complex APIs and web services to facilitate seamless data synchronization across mobile platforms.
  • Pioneered the adoption of advanced state management techniques using Redux to ensure robust and scalable application architecture.
  • Coordinated with cross-functional teams to design and implement critical app features, meeting both technical and consumer needs.
  • Conducted rigorous testing protocols to ensure application reliability and performance under diverse conditions.

React Native Developer

OpenGeeksLab
06.2017 - 07.2018
  • Developed and maintained React Native applications for both Android and iOS.
  • Optimized mobile apps for better speed and efficiency.
  • Integrated APIs for enhanced functionality.
  • Worked with design teams to implement user-friendly mobile interfaces.
  • Supported daily project management activities to meet deadlines effectively.

Skills

  • React Native
  • Redux/Jotai/RX
  • TypeScript
  • Firebase
  • CI/CD
  • App Store & Google Play
  • Xcode & Android Studio
  • Expo
  • GraphQL
  • HTML & CSS/tailwind
  • Flutter/Nodejs/ReactJS

Languages

Ukrainian, Russian
Native language
English
Upper intermediate
B2
Polish
Elementary
A2

Timeline

React Native Developer

NDA
06.2022 - 02.2023

React Native Developer

LG ThinQ Energy
05.2021 - 12.2023

React Native Developer

Crumbiz
10.2020 - 02.2021

React Native Developer

The Next Web Solutions
05.2019 - 02.2021

React Native Developer

Light IT
07.2018 - 07.2019

React Native Developer

OpenGeeksLab
06.2017 - 07.2018

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Ivan Hassay