Principal Ruby on Rails Engineer

This role expects a strong security mindset, with a clear understanding of data privacy, credential protection, device security, and the responsible use of corporate systems, tools, and accounts.
TOP 3 REASONS TO JOIN US
Perks you will love: Hybrid woring; 16 - 24 paid days off; Top modern & sufficient devices
Solid global business: No.1 market - 13.7 million B2C users in Japan; 140,000+ paying business customers; Listed in the prime market of Tokyo Stock Exchange
Hub of growth support: Fintech industry; Tailored L&D programs for individual growth
JOB DESCRIPTION
Design and develop services which can handle a massive amount of data
Design good database considering functional and non-functional requirements
Write clean and maintainable code
Improve code by continuous refactoring
Monitor application performance and fix system failures
Train junior/middle members
REQUIREMENTS
Must-Have
5+ year experience of development with Ruby on Rails
Good understanding of SOLID principles, common design patterns and best practices
Solid experience with MySQL or PostgreSQL including performance tuning and optimization
Experience with complicated system architecture which includes API linkage with external systems
Experience with application performance monitoring and opimization
Experience with automation testing, E2E testing
Extensive knowledge of web security
Familiarity with CI/CD, Docker
English communication
Experience of leading a project as a team leader
Strong sense of ownership
Nice-To-Have
Experience with Amazon Web Services
Experience with service operations on production
Experience with frontend development (TypeScript, ReactJS/VueJS)
Experience of training junior/middle members
OUR BENEFITS
Caring Mental & Physical Recreation:
Hybrid working: 2 days at the office and 3 days WFH
Working hour: Flexible start 8AM-9AM from Mon-Fri
Full salary in probation
Insurance: Applied from Probation period
Social Insurance, Health Insurance, Unemployment Insurance (on 100% salary)
Private health insurance & accident insurance. From Managing level: extra for family members
Bonus: 13th month salary
16 - 24 paid days off and more
Paternity leave: Extra 5 days
Annual company trip; Quarterly team building
Billiards & Running club
Annual health check
Well-equipped facility: Macbook pro, additional monitor,..
Caring Career & Development:
Clear Career path
Foreign language & International technology-related certifications sponsoring
External & internal training courses
Soft-skill workshops
Tech seminars
Monthly and biannual Recognition Awards
Performance & salary review: twice/year (Jun & Dec)