Ruby on Rails Developer

Responsibilities

• Design, build, and operate reliable backend services for payment products using Ruby and Ruby on Rails.
• Build and maintain APIs, services, and third-party integrations.
• Implement payment flows across multiple currencies, countries, and payment methods.
• Handle refunds, retries, idempotency, webhooks, asynchronous processing, and partial failures.
• Write clean, maintainable, and testable code; participate in code reviews and refactoring.
• Improve system performance, reliability, observability, and security.
• Investigate production issues, contribute to root-cause analysis, and prevent regressions.
• Collaborate with product, QA, and other engineers; communicate risks early.

Requirements

• 3+ years of backend engineering experience for a mid-level role, or 5+ years for senior level, including hands-on experience building applications with Ruby and Ruby on Rails.
• English communication proficiency at B2 level or above.
• Experience designing, building, and operating production APIs and backend services, including authentication and authorization, pagination, validation, and consistent error handling.
• Practical experience troubleshooting production issues using application logs, metrics, stack traces, and database queries.
• Working knowledge of relational databases, preferably PostgreSQL or MySQL, including schema design fundamentals, indexes, transactions, and writing SQL for investigation and troubleshooting.
• Experience working with background jobs and asynchronous workflows, including queues, retries, failure handling, and idempotency.
• Experience debugging issues across APIs, background jobs, databases, and external service integrations.

Benefits

• Working location: Tan My Ward, (District 7), HCMC
• Salary range: Up to VND 65,000,000 gross