Javascript Developer & React Developer & React Native Developer

This candidate is a React and React Native developer who has been developing in these technologies for over 7 years in commercial practice. He also excels in technologies such as iOS, Android, Java and Kotlin. In his current position, he is leading a project for Norwegian clients focusing on a train travel assistance app as of September 2021. He is involved in technical design, product delivery and DevOps support, using technologies such as React, React-Native, iOS, Android, Swift, Objective-C, Java and Kotlin. Previous roles include projects with customers in the UK, Belgium, the US and Israel. Their diverse experience includes digital publishing, social media management, and business education platforms, leveraging technologies such as GraphQL, Typescript, Node.js, Docker, and more. They are proficient in communicating in English at an excellent level.

Self-employed, Spišská Nová Ves (Norwegian customer)

• Duration September 2021 - Present (2 years)
• Role: React, React-Native, iOS, Android, Java/Kotlin full-stack senior engineer (Technology and team leader)
• Project Description: Assistance with traveling by train conveniently on your phone. App for travelers with limited mobility to plan trips, request assistance, and monitor trips in real-time.
• Responsibilities: Application technical design, product delivery, DevOps support, testing, sprint planning, estimations, new feature implementation, optimization.
• Technologies: React, React-Native, iOS, Android, Java, Kotlin, Swift, Objective-C, REST, GraphQL, Typescript, Docker, Kubernetes, Azure, GitHub Actions, Firebase, and more.

Self-employed, Spišská Nová Ves (UK customer)

• Duration: Aug 2018 - July 2020 (1 year and 11 months)
• Role: React, React-Native, iOS, Android, AWS senior full-stack engineer
• Project Description: International weekly newspaper app focusing on current affairs, business, politics, and technology.
• Responsibilities: Development, testing, estimation, advertisement & subscription management, optimization, new features.
• Technologies: React, React-Native, iOS, Android, AWS, CircleCI, GitHub Actions, Bamboo, Firebase, and more.

Self-employed, Spišská Nová Ves (Belgian customer)

• Duration: July 2020 - September 2021 (1 year and 2 months)
• Role: React, React-Native, Node.js, iOS, Android full-stack senior engineer (Technology and team leader)
• Project Description: Assistance with traveling by train app for travelers with limited mobility.
• Responsibilities: Technical design, product delivery, DevOps, testing, sprint planning, estimations, new features, optimization.
• Technologies: React, React-Native, Node.js, iOS, Android, Kotlin, Java, Jenkins, Sonarcube, Azure, Firebase, and more.

Self-employed, Košice (US customer)

• Duration: Sep 2016 - Dec 2017 (1 year and 4 months)
• Role: iOS Senior developer
• Project Description: Social media campaigns management mobile app - content marketing platform for enterprise.
• Responsibilities: iOS development, feature integration, bug fixing, code review, testing, planning, CI/CD.
• Technologies: iOS, Swift, SwiftUI.

Self-employed, Spišská Nová Ves (UK customer)

• Duration: Jan 2018 - July 2018 (7 months)
• Role: React-Native Senior developer
• Project Description: International weekly newspaper app.
• Responsibilities: React-Native development, testing, planning, estimations, advertisement integration, optimization.
• Technologies: React-Native, iOS, Android, Typescript, Firebase.

Self-employed, Spišská Nová Ves (Israel customer)

• Duration: May 2018 - Aug 2018 (3 months)
• Role: React-Native Solution Architect, Full-stack engineer
• Project Description: Business education platform for millennials.
• Responsibilities: Technical architecture, development, backend, DevOps, planning, optimization.
• Technologies: React, React-Native, Nest.js, Docker, Kubernetes, Helm.

Freelancer, Košice (German customer)

• Duration: June 2014 - Nov 2014 (6 months)
• Role: Java mid developer
• Project Description: SAP data to Java transformations, data encryption/decryption, automation system for SAP data manipulation.
• Responsibilities: Java Spring development, compression/decompression, data validation.
• Technologies: Java, JNI, CloverETL.

Freelancer, Košice (Slovak customer)

• Duration: Nov 2014 - Sep 2015 (11 months)
• Role: Full-stack iOS/PHP Tech leader
• Project Description: Retail system, statistics operations, composed of multiple applications.
• Responsibilities: Tech leadership, iOS and PHP development, deployment management, business analysis.
• Technologies: iOS, Swift, PHP, Symfony, PostgreSQL.

Freelancer, Košice (Czech customer)

• Duration: Sep 2015 - Sep 2016 (about 1 year)
• Role: React/NodeJS full-stack developer
• Project Description: Automotive web system for marketing and mobile app management, customer service systems.
• Responsibilities: Backend and frontend development, database manipulations, pipeline configuration, Docker.
• Technologies: React, Microsoft SQL, Docker, NodeJS, Azure, TFS.

Internship, Košice

• Duration: Sep 2011 - Dec 2012 (over 1 year)
• Role: Full-stack developer
• Project Description: Driving skills evaluation in public transportation using sensor data analysis.
• Responsibilities: Full-stack development, database design, UI/UX design, project management.
• Technologies: Android SDK, Angular, Meteor.js, Ionic, MongoDB, ReactiveX