【SaaS】Sales Platform_Senior Backend Engineer

We’re hiring a Senior Backend Engineer to lead our enterprise rollout through technology

About Geniee Inc.

We were founded in April 2010 with the goal of creating a global tech company from Japan, like GAFA. We went public only seven years after our founding and have kept increasing both revenue and profit since then. We are a fast-growing company.

As a marketing technology company, we operate an ad platform business, a marketing SaaS business, and a digital PR business. We are a rare company that has both ad technology and marketing technology products, and we continue to grow.

In 2020, we were selected in the Financial Times “High-Growth Companies Asia-Pacific” ranking. In 2023, we established JAPAN AI Inc. as a wholly owned subsidiary to focus on the cutting-edge AI business. JAPAN AI’s technology creates synergy with Geniee’s existing products, and the group is achieving high growth. By offering state-of-the-art solutions, we help customers improve efficiency and productivity.

Note: The “High-Growth Companies Asia-Pacific 2020” ranking surveyed more than 50 million companies in 12 countries in the Asia-Pacific region. It selected 500 companies based on revenue growth from 2015 to 2018. Geniee ranked 357th overall and 11th among technology companies from Japan. 

https://geniee.co.jp/news/20200525/232

Why We’re Hiring

“Use your experience to lead our team to the next stage.”

Our in-house AI-powered SFA/CRM, GENIEE SFA/CRM, has gained many customers. It is growing 300% YoY and is entering a new phase as we expand into the enterprise market.

However, our development organization is feeling strong growing pains. Rapid expansion has left our structure unfinished, support for high-potential young members is behind, and we carry technical debt. To maximize product value and secure our competitiveness, we must solve these issues and mature both our organization and technology.

This role is not just to fill a seat. With your rich SaaS development experience and leadership, we want you to tackle our “technical debt” as room for growth and act as a trusted senior who guides our highly capable junior engineers—the technical pillar of the team.

Join us to build a development organization with world-class technical strength and take our product to the next level.

Note: GENIEE SFA/CRM won 1st place in the SFA (sales support system) category at the BOXIL SaaS AWARD 2025.

Press release: BOXIL SaaS AWARD 2025.

Job Description

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.

Position

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.

Why You’ll Love This Role

1. Your experience will define our “standards” Because the organization is still maturing, your experience will become the foundation of our processes and culture. You’ll take ownership of building core pillars—architecture design, coding conventions, and training systems—gaining rare, high-impact experience.
2. Grow high-potential juniors into world-class engineers We have highly motivated members in their 20s–30s, but structured growth support hasn’t fully caught up. You’ll mentor them closely and scale together as a team—an experience that brings strong purpose and joy.
3. Tackle advanced challenges in enterprise SaaS As we expand into the enterprise market, we face demanding problems in scalability, performance, and security. You’ll lead the resolution of complex issues, including paying down technical debt, and further increase your market value as an engineer.
4. Build at the forefront of AI-powered product development We embed our in-house AI technology into the product to create the next generation of SFA/CRM. You’ll deepen your knowledge of AI-driven features and gain practical, hands-on skills in an environment built for innovation.

Work Style

Primarily office-based, with the option to work from home two days per week.
Note: This may change in the future depending on circumstances.

Tech Stack

Backend: Python
Frontend: React, Typescript, OpenAPI
Cloud: AWS, GCP
Container: Docker, AWS Lambda
DB: MongoDB, AWS RDS, MySQL, AWS OpenSearch, AWS Redis, Amazon DynamoDB
CI/CD: GitHub Actions, Circle CI, Jenkins
Design Philosophy: DDD
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, etc.
Others: Windows/Mac available by choice

Required Qualifications

• Over 3 years of experience developing web applications using modern frameworks.
  3+ years of hands-on experience with at least two backend programming languages such as Python or Ruby.
• 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.
• Vietnamese

We’re Looking For

• Someone passionate about analyzing complex technical challenges and driving solutions
• Someone who takes joy in the team’s growth and success, and actively shares their own experience
• Someone who enjoys unstructured environments and takes ownership to build processes and culture
• Someone who collaborates across departments to tackle shared problems together

Selection Process

CV Screening → Coding test → Multiple Interviews → Final Interview
(Reference checks and SPI test are required before the final interview.)