Ruby Jobs

I’m expanding our engineering group to tackle several green-field products that blend full-stack web work with a major AI initiative. My most urgent need is someone who lives and breathes machine learning—specifically model training and optimisation—and is comfortable doing it in Python. You’ll take ownership of the entire training workflow: building data pipelines, crafting efficient training loops, fine-tuning models, and squeezing every drop of performance out of our GPU clusters on AWS. Because the broader team also works in Rust micro-services and Ruby on Rails APIs, an appreciation for end-to-end software delivery is important; your models will eventually power customer-facing features served from those back-ends. Core responsibilities • Design and impl...

About the Opportunity I'm looking for a reliable and experienced Ruby Developer to collaborate with me on a long-term basis. This is a remote position with a fixed monthly salary, offering stable, ongoing work rather than short-term contracts. Requirements 2+ years of professional experience with Ruby/Ruby on Rails Strong understanding of Git and GitHub workflows Ability to fix bugs, implement features, and review pull requests Must be able to read and understand Japanese documentation, issues, and comments without using translation tools Speaking or writing Japanese is not required Good written English communication Responsible, proactive, and able to work independently Nice to Have Experience with PostgreSQL, Redis, Sidekiq, Docker Familiarity with CI/CD and automated testing Expe...

I need a seasoned Ruby engineer (around five years’ hands-on work) to help me build and continuously improve a production-grade web application running on Ruby on Rails. You will dive straight into an existing codebase, shape new features from scratch, and keep the current ones lean, secure, and well-tested. Day-to-day you’ll be pairing with me on feature planning, writing clean Ruby, refining ActiveRecord queries, introducing service objects where it makes sense, and pushing everything through Git-based workflows with peer reviews and CI. Solid knowledge of Rails conventions, background jobs, caching, and test-driven development is essential because we rely heavily on RSpec and Capybara for stability. I will give you clear tickets, Figma screens, and access to the staging en...