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Hi there! I’m Josef Guillen, a mobile and software developer with over 8 years of experience building cross-platform apps, web interfaces, and backend services. I enjoy turning ideas into solid, scalable solutions using Flutter, Android and iOS, and modern web stacks. I’m collaborative, detail-oriented, and motivated to deliver clean code and great user experiences. Portfolio: _Website not available. Sign in: https://www.twine.net/signup_…Hi there! I’m Josef Guillen, a mobile and software developer with over 8 years of experience building cross-platform apps, web interfaces, and backend services. I enjoy turning ideas into solid, scalable solutions using Flutter, Android and iOS, and modern web stacks. I’m collaborative, detail-oriented, and motivated to deliver clean code and great user experiences. Portfolio: _Website not available. Sign in: https://www.twine.net/signup_

Josef Guillen

App Developer, Web Developer, Full Stack Developer, +2

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Hi there! I’m Josef Guillen, a mobile and software developer with over 8 years of experience building cross-platform apps, web interfaces, and backend services. I enjoy turning ideas into solid, scalable solutions using Flutter, Android and iOS, and modern web stacks. I’m collaborative, detail-oriented, and motivated to deliver clean code and great user experiences. Portfolio: _Website not available. Sign in: https://www.twine.net/signup_…Hi there! I’m Josef Guillen, a mobile and software developer with over 8 years of experience building cross-platform apps, web interfaces, and backend services. I enjoy turning ideas into solid, scalable solutions using Flutter, Android and iOS, and modern web stacks. I’m collaborative, detail-oriented, and motivated to deliver clean code and great user experiences. Portfolio: _Website not available. Sign in: https://www.twine.net/signup_

Available to hire

Hi there! I’m Josef Guillen, a mobile and software developer with over 8 years of experience building cross-platform apps, web interfaces, and backend services. I enjoy turning ideas into solid, scalable solutions using Flutter, Android and iOS, and modern web stacks. I’m collaborative, detail-oriented, and motivated to deliver clean code and great user experiences.

Portfolio: Website not available. Sign in: https://www.twine.net/signup

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Work Experience

Mobile App Developer at Hitachi Digital Payment Solutions

November 1, 2024 - November 1, 2025

Contributed to development and maintenance of a widely used mobile payment application in the Philippines. Implemented new features and resolved critical bugs to improve user experience and app stability. Used Flutter to build scalable and responsive UI components, ensuring cross-platform compatibility. Collaborated closely with QA and backend teams to ensure features integrated correctly and released on schedule.

Tech Lead / Mobile & Backend Developer at Vision Frame AI (Digital Frame)

January 1, 2024 - July 1, 2024

Led the full development of Vision Frame AI, an AI-powered platform for generating and displaying unique digital art. Managed client communications and gathered feedback to shape solutions. Assigned tasks to junior developers and mentored them to grow in their roles. Built the mobile app and backend from scratch, integrating OpenAI APIs to offer a gallery, chat, and editable art features, delivering an engaging, user-friendly experience.

Mobile App Developer at FP G Insurance

October 1, 2020 - April 1, 2022

Developed the SIM ONE App (Insurance Application) for FP G Insurance, enabling mobility and real-time data flows. Key tasks included implementing device communication features to remotely operate a connected blood analyzer, real-time status tracking, and the core 'Measure' functionality, with collaboration across QA and backend teams to ensure reliability and timely releases.

Mobile Application Developer at Centrix Mobile

June 1, 2017 - October 1, 2020

Centrix Mobile Merchandising App (Survey Application) helps agents check product availability in designated supermarkets. Maintained and enhanced the Xamarin-based app, addressing user inquiries and bug reports to ensure a seamless experience. Led release efforts to Google Play and supported ongoing maintenance for users.