What We Do
From technology selection to development and operations, we support every phase of your project.
Ruby on Rails Development
From designing and building new Rails apps to adding features and improving performance in existing ones. We specialize in modern Rails development with ActionCable and Hotwire.
Phoenix / Elixir Development
For systems that demand real-time communication or high traffic. We build high-performance applications using Phoenix LiveView and Channels.
Technical Consulting
Code review, architecture design, security assessment, and second opinions. We solve technical challenges from an objective perspective.
Our Products
As proof of our technical ability, we develop and operate our own products.
Japan Voyage
A platform for finding golf, ski, and travel companions in Japan. Built with Rails 8, it implements real-time notifications, multilingual support, and map search.
Company Profile
- Company Name
- Sampo Development LLC
- Founded
- 2021
- Location
- Suita, Osaka, Japan
- Representative
- Kuokkanen Sampo
- Employees
- 2 people
- Languages
- Japanese, English, Chinese, Finnish
Strengths
- Extensive experience with real-time communication (WebSocket, ActionCable, Phoenix Channels).
- Able to develop and communicate in a multilingual environment (Japanese, English, Chinese).
- Consistent support from design through deployment and operation.
- Objective technical evaluation as a second opinion.
Team
Sampo Kuokkanen
Representative / CEO
A Ruby and Elixir developer from Finland, living in Japan. Representative of Sampo Development LLC and head of the Evil Martians GK Japan office. He is active in the Japanese Ruby community.
Speaking
- Kaigi on Rails 2023
- RubyWorld Conference 2024 — “Keeping it Ruby: why your product need to have Ruby SDK”
- RubyConf Taiwan 2025 — “What is happening with strings in Ruby and why is it feeling chilly?”
Anssi Kuokkanen
Engineer
A Ruby on Rails engineer from Finland, living in Japan. He specializes in UX-focused web application development, handling everything from design to implementation. His motto is building products that balance usability and maintainability.
Education
- University of Helsinki, Graduate School — Master's degree
- Kobe University, Graduate School — Exchange program
Feel Free to Get in Touch
Whether it's a development project, technical consultation, or a second opinion, please don't hesitate to reach out. Email, X, or GitHub — whichever works for you.