【★Full-Stack Engineer】AI-Driven Marketing & SFA/CRM SaaS / Hybrid / JLPT N1 Challenge Level～

★【SaaS】AI × Marketing SaaS – Full-Stack Engineer | Marketing Technology Company

• Business Level Japanese Required

◆ Listed Company

◆ Hybrid Work

◆ Global Business

◆ Great Welfare

◆ Annual Salary： 7 million ～ 12 million yen.

-------------【About the company】-------------

Business Overview.

Development and provision of advertising delivery platforms for Internet media

(2) Providing marketing support services for advertisers and advertising agencies

They support the development and introduction of the marketing automation system, the CRM/SFA and the chat tool.

[Specifically...]

In the realm of ad technology and digital marketing, they use cutting-edge technology to independently develop products that help our clients maximize their revenues.

In particular, they are focusing on platform business, which analyzes users' access to ad spaces in web media and smartphone applications and delivers the most appropriate ads in a real-time auction format.

In fiscal 2016, the core business expanded to the No. 1 scale in Japan.

In addition, they have developed six products in-house: "SSP," "DSP," "DMP," "Marketing Automation," "CRM/SFA," and "Chatbot" for domestic and overseas markets.

As of June 2019, they have six overseas offices in five countries, including Singapore, Vietnam, Indonesia, Thailand, and India. Even in rapidly growing Asia, we are working to maximize advertising revenue for local companies by leveraging Japan's advanced technological capabilities.

Going forward, they will continue to lead the field of ad technology both in Japan and abroad, and take on the challenge of exploring unknown areas.

-------------【 Job Description】-------------

【About the Company】

Founded in April 2010 with the vision of creating a world-class technology titan from Japan, the company achieved its public listing within just seven years of inception. It continues to operate as a market-leading enterprise at the intersection of marketing technology and AI, maintaining a strong average annual growth rate exceeding 30%.

The organization operates across ad-tech platforms, marketing SaaS solutions, and digital PR services—standing out as a rare enterprise possessing both ad-tech and mar-tech product ecosystems.

In 2023, the group established a dedicated AI subsidiary to spearhead developments in cutting-edge markets. The advanced capabilities developed by this subsidiary create powerful synergies with the parent company's existing products, serving as a primary catalyst for group-wide expansion.

The enterprise has entered its "Third Founding Era," marking a major strategic inflection point that fuses its robust foundation in marketing and advertising with state-of-the-art group AI technologies. Rather than simply adding incremental features to legacy SaaS offerings, the company aims to build transformative, AI-first products that redefine modern marketing execution on a global scale.

【Recruitment Background】

The company's proprietary AI-powered SFA/CRM platform continues to see rapid market adoption, demonstrating 300% YoY growth as it enters a new expansion phase into the enterprise segment.

However, behind this momentum, the engineering organization faces significant growth challenges. Rapid scaling has led to organizational gaps, delayed career support for promising junior engineers, and accumulated technical debt. To maximize product value and solidify its competitive market edge, the team must evolve both its engineering architecture and organizational maturity.

This role is not merely a head-count addition. The organization seeks an experienced engineer whose strong SaaS background and technical leadership will transform technical debt into product scalability. You will serve as the core technical pillar of the team—acting as a dependable mentor to guide high-potential junior engineers.

The company invites you to build a world-class engineering team and elevate its products to new heights.

【Responsibilities】

As a Full-Stack Engineer leading the technical evolution of the rapidly growing SFA/CRM platform, you will oversee everything from architecture design and hands-on development to team mentorship and capability building.

In this pivotal role, you will leverage your engineering expertise to guide technical decision-making while acting as a mentor to elevate team capabilities, directly shaping product quality and engineering culture.

Design, development, and maintenance of high-quality, high-performance software applications and systems

Identifying and implementing effective solutions to technical challenges (such as performance improvements and resolving technical debt)

Writing code that is readable, efficient, and easy to maintain, based on best practices

Participating in discussions regarding technical design, architecture, and long-term system strategy

Sharing technical knowledge and fostering the growth of junior engineers through guidance and mentoring

Improving quality, consistency, and maintainability through code reviews

Staying abreast of new technologies and industry trends and applying them to the team and projects

Working closely with stakeholders such as product managers, designers, and business owners to drive the achievement of common goals

【Development Environment】

Backend: Python, FastAPI

Frontend: React, Next.js, TypeScript

-------------【 Requirements】-------------

【Required】

3+ years of experience developing web applications using modern frameworks

1+ years of full-stack development experience with Python, TypeScript, React, etc.

Experience developing enterprise-grade SaaS services

Experience developing on major cloud platforms such as AWS and GCP

Practical experience with database technologies such as SQL and NoSQL

Experience utilizing generative AI (e.g., to improve development efficiency and quality through code generation and code review assistance)

Business-level Japanese proficiency

【Preferred】

3+ years of experience developing web applications using modern frameworks

1+ years of full-stack development experience with Python, TypeScript, React, etc.

Experience developing enterprise-grade SaaS services

Experience developing on major cloud platforms such as AWS and GCP

Practical experience with database technologies such as SQL and NoSQL

Experience utilizing generative AI (e.g., to improve development efficiency and quality through code generation and code review assistance)

Business-level Japanese proficiency

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【Working Hours】

10:00~19:00

【Holidays】

・Full holiday 2 day system (Saturday / Sunday) holidays

・Annual paid leave

・New Year Holiday

・Summer Holiday

・Winter Holiday

【Welfare】

・Book purchase subsidy (up to 30,000 yen per half year)

・Refreshment allowance (up to 5,000 yen per month)

・Rent allowance

・Support system for acquiring qualifications and languages, and support for attending training courses (individual application required)

・Working parents' support system

・Refreshment leave system

・Club activity allowance

・Other in-house events (monthly get-togethers, etc.)

・Use of Kanto IT Software Health Insurance Association's recreational facilities, affiliated sports clubs, etc.

・Regular health checkups (once a year)

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