Building a Securities Brokerage with Ruby and Go

#go #programming #ruby #software

December 31, 2025

How Bloomo built a regulated trading system from scratch

By Satoshi Kobayashi (noel), CTO – Bloomo Securities RubyWorld Conference 2025 – Day 1

Introduction

At RubyWorld Conference 2025 , Satoshi Kobayashi (小林悟史 / noel), CTO of Bloomo Securities Inc. , delivered one of the most consequential Ruby case studies in recent years:

“Building a Securities System from Scratch with Ruby and Go – What Worked, What Hurt, and What We Learned.”

Bloomo is not a fintech demo. It is a licensed Japanese securities broker that allows customers to invest in US stocks and ETFs , automatically execute trades, and manage diversified portfolios.

What makes this story extraordinary is not just the product — it is that Bloomo’s core production system is built on Ruby on Rails and Go , running on Kubernetes in Google Cloud, and trusted with real customer money.

👉 Full article https://rubystacknews.com/2025/12/31/building-a-securities-brokerage-with-ruby-and-go/