Hiroshi Kaneko - Senior Software Engineer

Q: Where is Hiroshi based?

Hiroshi is based in Gliwice, Poland .

Q: What languages does Hiroshi speak?

Hiroshi speaks the following languages: English (Advanced), Japanese (Intermediate) .

Q: How many years of experience does Hiroshi have?

Hiroshi has at least 11 years of experience. During this time, Hiroshi has worked in at least 3 different roles and for 3 different companies . The average length of individual experience is 4 years and 8 months . Note that Hiroshi may not have shared all experience and actually has more experience.

Q: What is Hiroshi's latest experience?

Hiroshi's most recent position is Senior Software Engineer at instinctools .

Q: What companies has Hiroshi worked for in recent years?

In recent years, Hiroshi has worked for instinctools and Otsuka Techno Corporation .

Q: Which industries is Hiroshi most experienced in?

Hiroshi is most experienced in industries like Information Technology (IT) .

Q: Which business areas is Hiroshi most experienced in?

Hiroshi is most experienced in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) .

Q: Which industries has Hiroshi worked in recently?

Hiroshi has recently worked in industries like Information Technology (IT) .

Q: Which business areas has Hiroshi worked in recently?

Hiroshi has recently worked in business areas like Information Technology (IT) and Product Development .

Recommended expert

Gliwice, Poland

Experience

Apr 2023 - Dec 2025

2 years 9 months

Senior Software Engineer

instinctools

Led the design and implementation of complex Ruby backend services using object-oriented patterns and metaprogramming techniques to support scalable data-processing workflows
Reviewed and refactored large Ruby codebases using RuboCop, custom linters, and RSpec to improve readability, maintainability, and long-term stability
Built internal Ruby-based tooling to automatically generate, validate, and annotate code samples for AI-assisted testing and experimentation
Integrated Ruby test suites into CI/CD pipelines using GitHub Actions and Jenkins to ensure consistent quality checks across multiple repositories
Analyzed code smells and architectural anti-patterns in legacy Ruby systems and documented remediation strategies for engineering teams
Collaborated with solution engineers to benchmark Ruby services in sandboxed environments and evaluate execution behavior under different constraints
Developed Dockerized Ruby environments to ensure reproducible execution for testing, training, and evaluation workflows
Profiled and debugged performance bottlenecks in Ruby applications using built-in profilers and custom instrumentation
Produced detailed technical documentation covering test strategies, known defects, and accumulated technical debt
Mentored engineers on advanced Ruby practices, code review standards, and effective use of AI-powered coding assistants

Jun 2018 - Jan 2023

4 years 8 months

Full Stack Engineer

Otsuka Techno Corporation

Developed and maintained Ruby-based backend services for enterprise applications using clean architecture and domain-driven design principles
Implemented automated test suites in RSpec and Minitest and integrated them into GitLab CI pipelines to ensure reliable deployments
Conducted systematic code reviews to identify Ruby anti-patterns, insufficient test coverage, and maintainability issues
Designed internal Ruby scripts to automate data validation, reporting, and deployment-related tasks
Collaborated with cross-functional teams to evaluate and improve development guidelines for new technical domains
Supported containerized application workflows using Docker to standardize development and testing environments
Debugged complex production issues in Ruby applications using logging, profiling, and step-by-step analysis
Maintained clear documentation for bugs, test cases, and refactoring decisions to support long-term knowledge retention
Worked with Git-based workflows, including branching strategies, pull requests, and release management
Contributed to proof-of-concept projects exploring AI-assisted testing and automated code analysis in Ruby projects

Jul 2014 - Apr 2018

3 years 10 months

Full-stack Developer

TIS

Implemented Ruby backend features under senior guidance, focusing on clean, readable, and idiomatic Ruby code
Assisted in writing and maintaining unit and integration tests using RSpec to validate business logic
Fixed defects in existing Ruby applications by analyzing logs, reproducing issues, and applying targeted patches
Supported code review processes by addressing feedback and improving adherence to coding standards
Wrote internal documentation describing implemented features, known limitations, and testing approaches
Gained hands-on experience with Git workflows, Linux command-line tools, and basic CI pipelines
Helped maintain SQL queries and data-access layers integrated with Ruby applications
Participated in refactoring efforts to simplify legacy code and improve long-term maintainability
Assisted in containerizing simple Ruby services using Docker for development and testing consistency
Built foundational skills in debugging, profiling, and understanding performance characteristics of Ruby applications

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (11 years).

Information Technology

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (11 years), Product Development (8.5 years), and Quality Assurance (4 years).

Information Technology

Product Development

Quality Assurance

Summary

I’m a senior software engineer with over 10 years of professional experience, specializing in Ruby development, backend systems, and high-quality code practices. I have strong expertise in object-oriented design, metaprogramming, and writing idiomatic Ruby, combined with a deep interest in AI-assisted software development and large language models. I’m comfortable working with complex guidelines, reviewing and generating code at scale, and collaborating asynchronously with cross-functional teams on experimental and data-intensive projects.

Skills

Languages: Ruby, Python, Javascript, Typescript, Sql
Ruby Expertise: Object-oriented Programming, Metaprogramming, Dsl Design, Refactoring, Performance Profiling
Ai & Llm Workflows: Prompt Evaluation, Code Annotation, Model Training Support, Benchmarking, Agent-based Code Execution
Testing: Rspec, Minitest, Test Coverage Analysis, Test Gap Identification, Ci Test Integration
Ci/cd: Github Actions, Gitlab Ci, Jenkins, Circleci
Devops & Tooling: Docker, Linux Cli, Bash Scripting, Git
Code Quality: Code Review, Anti-pattern Detection, Code Smell Analysis, Technical Debt Documentation
Collaboration: Asynchronous Communication, Cross-team Reviews, Guideline Adaptation, Knowledge Sharing
Documentation: Test Documentation, Bug Reports, Architecture Notes, Internal Guidelines

Languages

English

Advanced

Japanese

Intermediate

Education

Apr 2010 - Mar 2014

Kyushu University

Bachelor's degree, Computer Science · Computer Science · Fukuoka, Japan

Profile

Created

January 2026

Need a freelancer? Find your match in seconds.

Try FRATCH GPT

Frequently asked questions

Do you have questions? Here you can find further information.

Where is Hiroshi based?

Hiroshi is based in Gliwice, Poland.

What languages does Hiroshi speak?

Hiroshi speaks the following languages: English (Advanced), Japanese (Intermediate).

How many years of experience does Hiroshi have?

Hiroshi has at least 11 years of experience. During this time, Hiroshi has worked in at least 3 different roles and for 3 different companies. The average length of individual experience is 4 years and 8 months. Note that Hiroshi may not have shared all experience and actually has more experience.

What roles would Hiroshi be best suited for?

Based on recent experience, Hiroshi would be well-suited for roles such as: Senior Software Engineer, Full Stack Engineer, Full-stack Developer.

What is Hiroshi's latest experience?

Hiroshi's most recent position is Senior Software Engineer at instinctools.

What companies has Hiroshi worked for in recent years?

In recent years, Hiroshi has worked for instinctools and Otsuka Techno Corporation.

Which industries is Hiroshi most experienced in?

Hiroshi is most experienced in industries like Information Technology (IT).

Which business areas is Hiroshi most experienced in?

Hiroshi is most experienced in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA).

Which industries has Hiroshi worked in recently?

Hiroshi has recently worked in industries like Information Technology (IT).

Which business areas has Hiroshi worked in recently?

Hiroshi has recently worked in business areas like Information Technology (IT) and Product Development.

What is Hiroshi's education?

Hiroshi holds a Bachelor in Computer Science from Kyushu University.

What is the availability of Hiroshi?

The availability of Hiroshi needs to be confirmed.

What is the rate of Hiroshi?

Hiroshi's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.