I am a Senior Software Developer with extensive experience in cross-platform mobile development using Flutter and React Native, and strong full-stack web skills in React and Angular. I also have a solid foundation in Node.js backend development and database design, delivering mission-critical applications across financial services and enterprise projects for telecom, insurance, and banking sectors. I’ve led engineering teams and shaped architecture while remaining hands-on with implementation decisions. I’ve steered multi-team initiatives at GymBeam, launching mobile e-commerce apps and Magento-driven platforms, while continuously upskilling and mentoring colleagues. I enjoy solving complex problems, building scalable systems, and collaborating with product and business stakeholders to deliver value.

Ján Široký

I am a Senior Software Developer with extensive experience in cross-platform mobile development using Flutter and React Native, and strong full-stack web skills in React and Angular. I also have a solid foundation in Node.js backend development and database design, delivering mission-critical applications across financial services and enterprise projects for telecom, insurance, and banking sectors. I’ve led engineering teams and shaped architecture while remaining hands-on with implementation decisions. I’ve steered multi-team initiatives at GymBeam, launching mobile e-commerce apps and Magento-driven platforms, while continuously upskilling and mentoring colleagues. I enjoy solving complex problems, building scalable systems, and collaborating with product and business stakeholders to deliver value.

Available to hire

I am a Senior Software Developer with extensive experience in cross-platform mobile development using Flutter and React Native, and strong full-stack web skills in React and Angular. I also have a solid foundation in Node.js backend development and database design, delivering mission-critical applications across financial services and enterprise projects for telecom, insurance, and banking sectors. I’ve led engineering teams and shaped architecture while remaining hands-on with implementation decisions.

I’ve steered multi-team initiatives at GymBeam, launching mobile e-commerce apps and Magento-driven platforms, while continuously upskilling and mentoring colleagues. I enjoy solving complex problems, building scalable systems, and collaborating with product and business stakeholders to deliver value.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
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Language

Slovak
Fluent
English
Advanced
French
Beginner

Work Experience

CTO Associate at GymBeam
January 1, 2025 - October 23, 2025
Assisted in overseeing the development of GymBeam’s first mobile application and contributed to four IT teams, including Magento platform development; supported architecture and product strategy.
Director of Magento Systems at GymBeam
January 1, 2025 - October 23, 2025
Led four IT teams focusing on Magento development, Next.js frontend migration, React Native mobile app, and WordPress blog; collaborated with team leads to align goals and support the mobile app development.
Flutter Developer / Front-end & Full-stack at Finportal
January 1, 2024 - October 23, 2025
Developed cross-platform internal company app (Flutter for iOS/Android/Web) with 40+ screens, chat, calculators, and complex forms; web login in React; implemented data-driven features and backend integrations.
Flutter Developer at Financie.app
January 1, 2022 - October 23, 2025
Developed Fintech mobile and web app with 40+ screens; led backend integration using Python/Go/NodeJS; initiated microservices architecture; implemented complex forms and charts.
Flutter Developer / Mobile & Web App at BodyFix.io
January 1, 2020 - October 23, 2025
Mobile app development with React Native and Flutter; neural network integration and computer vision; technical design and UI implementation in a small team.
Internal Company App Lead at PwC
January 1, 2021 - October 23, 2025
Developed internal company app with complex HTML rendering and annotations; architected and delivered the full app within six months.
Zonky – Platform Developer at Zonky
January 1, 2019 - October 23, 2025
Implemented new functionality in React and migrated functionality from AngularJS; hosted on AWS infrastructure (CloudFront, Lambda, EC2, Elastic Beanstalk, S3).
CTO Associate at GymBeam
January 1, 2025 - January 1, 2025
Assisted in overseeing the development of GymBeam’s first mobile application. Implemented the first version of automatic responses to customer emails, and collaborated with engineering leads to align mobile strategy and delivery across platforms.
Director of Magento Systems at GymBeam
January 1, 2025 - January 1, 2025
Led four IT teams focused on Magento features; front-end transitioned the store to Next.js; built a mobile app using React Native; maintained a WordPress-based blog; ensured cross-team communication and alignment of project goals; contributed to React Native development tasks.
Flutter Developer at Finportal – Financial Broker's app
January 1, 2024 - January 1, 2024
Development of a Flutter-based cross-platform internal app with 40+ screens, including chat, profiles, calculators, PDF export, charts, webviews, videos, notifications and 10+ complex forms with validations; designed and implemented Flutter frontend for iOS, Android and Web; web login flow implemented with React.
Front-end Developer at PwC – Internal company app
January 1, 2021 - January 1, 2021
Development of an internal company app with complex HTML rendering and annotations functionality; architectural design and production deployment within 6 months; Angular frontend implementation.
Front-end Developer at Zonky
January 1, 2019 - January 1, 2019
Implemented new functionality in React and migrated functionality from AngularJS; previously worked with Ember; contributed to AWS-based hosting and infrastructure; led migration efforts and frontend enhancements.
Front-end Developer at BodyFix.io
January 1, 2020 - January 1, 2020
Medical app development in Angular 6, React Native and Flutter (2017–2020); technical design, programming and UI work in a team of 3 developers; involved in neural network integration and computer vision components.
Full-stack Developer at Financie.app
January 1, 2022 - January 1, 2022
Extensive mobile application (40+ screens) with complex Python, Go and Node.js (Dart) backend microservices; technical design, implementation and UI development for mobile apps and websites across a cross-functional team of 5 developers.
Web Developer at Freelancer (Web development and design)
January 1, 2015 - January 1, 2015
Websites for small businesses with Bootstrap, jQuery and WordPress; custom design and implementation, responsive UI, website maintenance and enhancements.
Front-end Developer at Global Logic
January 1, 2018 - January 1, 2018
Angular Web App for a medical devices company; design and implementation of frontend features in Angular 6 within a team of 4 developers and 2 testers.
Front-end Developer at PosAm
January 1, 2017 - January 1, 2017
Mobile and Web app development for an insurance company; implemented new screens, logic and refactoring in AngularJS and later Angular 4 platforms.

Education

Software Engineering and Big Data at Unicorn University
January 11, 2030 - October 23, 2025
Economics at Economics university in Bratislava
January 11, 2030 - October 23, 2025
High School at Grammar School, Poštová 9, Košice
January 11, 2030 - October 23, 2025
Software Engineering and Big Data at Unicorn University
January 11, 2030 - November 16, 2025
Business Economics and Management at Economics university in Bratislava
January 11, 2030 - November 16, 2025
High School at Grammar School, Poštová 9, Košice
January 11, 2030 - November 16, 2025

Qualifications

Dart, Flutter, Google Cloud Platform
January 1, 2019 - October 23, 2025
Python
January 1, 2018 - October 23, 2025
NodeJS + Express, React Native
January 1, 2017 - October 23, 2025
Ionic 2
January 1, 2016 - October 23, 2025
Dart, Flutter, Google Cloud Platform
January 1, 2019 - November 16, 2025
Python
January 1, 2018 - November 16, 2025
NodeJS + Express, React Native
January 1, 2017 - November 16, 2025

Industry Experience

Software & Internet, Financial Services, Telecommunications, Professional Services, Retail