English Speaking Senior Backend Engineer

As a backend engineer who will technically lead our fast-growing SFA/CRM product, you will take on a wide range of responsibilities—from design and development to supporting team growth.• Design, build, and maintain robust, high-performance software applications and systems.

• Tackle complex technical challenges with creative and effective solutions.
• Produce clean, efficient, and well-documented code that adheres to best practices.
• Lead discussions on technical design, architecture, and long-term system strategy.
• Mentor junior engineers, providing guidance and sharing technical expertise.
• Conduct thorough code reviews to ensure quality, consistency, and maintainability.
• Keep current with emerging technologies, frameworks, and industry trends.
• Actively contribute to Agile processes such as sprint planning, daily stand-ups, and retrospectives.
• Collaborate closely with product managers, designers, business owners,and fellow engineers to deliver aligned outcomes.
• Help define technical specifications, project scopes, and implementation plans.

In this position, you are expected to be the technical compass of the team, not just a developer.
People management—such as goal setting and evaluations—will be handled by an experienced engineering manager. This environment allows you to focus 100% on technical leadership, technical decision-making, and team growth.

You will leverage your experience to lead technology selection and architecture design, while mentoring junior members to raise the team’s overall technical level. Your impact will directly shape product quality and the culture of our engineering organization—this is a highly important role.

Backend:  Python, FastAPI
Frontend:  React, Next.js, TypeScript
Mobile:  iOS: Swift / Android: Kotlin
Cloud Infrastructure:  Amazon ECS
Container:  Docker, AWS Lambda
Test Tools:  Playwright, Jest, Storybook, Chromatic
DB:  MySQL, BigQuery, MongoDB, AWS OpenSearch, AWS Redis
CI/CD:  GitHub Actions, CodeBuild
Design Philosophy:  DDD, Clean Architecture
Version Control System:  GitHub
Other Tools:  Slack, Jira, Confluence, Google Workspace
AI Coding:  Company covers the cost of using AI tools such as JAPAN AI SaaS services, Curosor, CharGPT, Claude, CodeRabbit, etc.
Others:  Windows/Mac available by choice

Required Qualifications

• 3+ years of experience developing web applications using modern frameworks.
• 3+ years of backend development experience with Python and other programming languages.
• Proven experience in developing  SaaS products for enterprise customers.
• More than 2 years of experience mentoring or leading team members in a senior or leadership capacity.
• Knowledge with major cloud platforms such as AWS and GCP.
• Practical experience with database technologies, including both SQL and NoSQL systems.

Preferred Qualifications

• Experience leading or managing a development team.
• Hands-on experience implementing and utilizing automated testing frameworks.
• Japanese language proficiency: JLPT N2 or conversational level.
• Proficiency in Vietnamese is a strong plus (to facilitate collaboration with our Vietnam-based development team).