Jeremy Marin

Minacolor, Tokyo

Senior Backend Engineer → Team Lead

2023 - Present

CrowdCast, Tokyo

Senior Backend Engineer → Team Lead → Engineering Manager

2015 - 2023

• Joined the company as the first in-house developer and established the first development standards
• Implemented most features of the first Ruby on Rails monolith version of the product
• Researched, planned and implemented the rewrite of the product into a SPA, using Rails, GraphQL and React as early as 2017. This product received a Good Design Award
• Integrated external Rest APIs such as Slack, Stripe, Komoju, Rakuten Bank, Moneytree, Mastercard or Xero
• Built continuous integration and deployment with GitHub Actions, Heroku and AWS services
• Switched to a manager role and successfully hired 10 engineers with junior or senior backgrounds. Organized 1:1 reviews, team hackathons and other team building events
• Conceived and developed Staple Card, the first self-managed corporate prepaid card offer released in Japan
• Collaborated closely with product managers and designers in an Agile environment to specify features and give time estimates to stakeholders.

Milky, Paris

Backend Developer

2014 - 2015

• Designed and coded a flexible Twitter bot applying several treatments or game dynamics (Ruby on Rails)
• Created a incident reporting application for the Paris suburb transportation network using unique QR codes (Ruby on Rails)
• Developed a couponing application listing discounts in Paris train stations with shop specific security codes (Ruby on Rails)
• Implemented deploy scripts for staging and production environments
• Led junior team members on projects for significant customers
• Assimilated web agency work methods and delivery challenges

Adikteev, Paris

Developer

2013 - 2014

• Contributed to the gamification platform made with Ruby on Rails and backbone.js components
• Adopted Agile SCRUM and continuous integration

DaCast, Paris

Junior Developer

2010 - 2013

• Contributed to the video streaming platforms made with PHP Zend Framework, Symfony 2, MySQL and Redis

oklm.xyz

2025

Personal blog talking about all my hobbies. Technologies used: Ruby, Jekyll, Github Actions, AWS S3, AWS Cloudfront See page

Dementia Kitchen

2025

2D time-attack 2D action game with procedurally generated levels. Technologies used: Godot, GDScript See page

Wallaby

2024

Generation of random mathematics exercices PDFs for kids. Technologies used: Ruby, Sinatra, Serverless Framework, AWS Lamdba, AWS S3 See page

Caretops

2022 - 2023

Mental wellbeing chatbot enabling bottom up communication with management. Technologies used: Ruby on Rails, PostgreSQL, Slack API, Tailwind CSS

T-Fal Japan

2022

Various landing pages promoting T-Fal products on their website. Technologies used: HMTL, CSS. See page

Kadowaki Farm

2021

Homepage for a vegetables and chicken farm in Hokkaido. Technologies used: HMTL, CSS. See website

Binary Clock

2020

Time and date displayed in dots on a LED matrix by a micro-controller. Technologies used: C++, Wemos D1-mini, ESP-8266. View source

Dominion Melee

2019

2 players shooting game with a 8-bit medieval atmosphere. Technologies used: JS, Contra. Try it on itch.io