Summary
Overview
Work History
Education
Skills
LANGUAGES
Timeline
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Ryotaro Isoyama

Ryotaro Isoyama

Tokyo,13

Summary

I am a software engineer with extensive experience in developing and maintaining large-scale mobile applications. At Gurunavi, I contributed to the restaurant search and reservation app used by millions, and successfully led a major project to rebuild the iOS/Android app with Flutter, significantly improving performance and maintainability.
After co-founding and working at a startup, I transitioned to working as a freelance engineer. Currently, I am the sole mobile engineer for a subscription-based craft beer delivery service, responsible for the full lifecycle of the app—from proposal and design to implementation, release, and maintenance—using Flutter for both iOS and Android.
I enjoy building applications independently and take pride in delivering high-quality, scalable solutions with technologies like Firebase, CI/CD, and analytics tools to support product and business goals.

Overview

4
4
years of professional experience

Work History

Lead Mobile Engineer (Flutter, IOS/Android)

Freelance / Subscription-based Craft Beer Delivery Startup
01.2025 - Current
  • Independently designed, developed, and maintained a cross-platform mobile application (Flutter) for iOS and Android, serving a monthly active user base of ~1,400.
  • Led end-to-end feature development including planning, requirements gathering, implementation, testing, and release.
  • Proposed and implemented new product features based on user feedback and business needs, contributing to customer engagement and retention.
  • Handled app store operations (App Store & Google Play), CI/CD pipelines, and crash/error monitoring setup.
  • Collaborated directly with stakeholders to align technical priorities with business objectives.

co-founder & CTO

Ten-Days, Inc.
10.2024 - 02.2025
  • Responsible for technology stack selection and feasibility assessment of implementations.
  • Collaborating on specification adjustments and application design.
  • Leading end-to-end app development, including implementation, testing, and deployment.
  • Defining operational strategies and ensuring smooth app management.
  • Actively contributing to business growth through sales initiatives and process development.

Mobile Application Engineer

Freelance Software Engineer (Multiple Clients)
04.2024 - Current
  • Developed mobile applications for various industries.
  • Collaborated with teams to design and implement scalable solutions.

Mobile Application Engineer(iOS)

Gurunavi, Inc.
04.2021 - 04.2024
  • Developed and maintained a large-scale restaurant search and reservation app used by millions of users.
  • Directed contract engineers by providing clear instructions and technical guidance.
  • Mentored new graduates through OJT (On-the-Job Training), fostering their growth as engineers.
  • Designed replacement architectures for legacy systems, ensuring scalability and maintainability.
  • Contributed to the successful migration of the app to Flutter, enhancing performance and user experience.

Education

Bachelor - Electrical and Electronic Engineering

Kyoto University
Kyoto
01.2019

Skills

  • Project Management
  • Teamwork
  • Leadership
  • Effective Communication
  • Critical Thinking
  • Dart
  • Mobile Application Engineering
  • GCP/Firebase

LANGUAGES

Japanese(Fluent)
English (Basic)

Timeline

Lead Mobile Engineer (Flutter, IOS/Android)

Freelance / Subscription-based Craft Beer Delivery Startup
01.2025 - Current

co-founder & CTO

Ten-Days, Inc.
10.2024 - 02.2025

Mobile Application Engineer

Freelance Software Engineer (Multiple Clients)
04.2024 - Current

Mobile Application Engineer(iOS)

Gurunavi, Inc.
04.2021 - 04.2024

Bachelor - Electrical and Electronic Engineering

Kyoto University

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Ryotaro Isoyama