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Job ID : 1544887 Date Updated : June 17th, 2025
FLEXTIME★FULLY REMOTE WORK

Full Stack Engineer | SaaS Venture Company

Hiring Company SaaS
Location Tokyo - 23 Wards
Job Type Permanent Full-time
Salary 7 million yen ~ 11 million yen

Work Style

Remote Work and WFH Flex Time

Job Description

【ABOUT THE COMPANY】

Due to social changes such as the declining labor force and technological development in recent years, the time has come when everyone can choose their own way of life and work.
In such an era when “individual power” is important, the company develops the following businesses with the mission of creating a “growth ecosystem” that supports all those who are making efforts to get closer to their dreams. doing.

・ HR Tech business
・ Conversation Tech business
・ Incubation business

 

【JOB DESCRIPTION】

The company has established "Givery AI Lab" to implement AI that solves the true challenges of its customers into society.
Givery AI Lab is a "co-creative lab development institution" that comprehensively supports development projects utilizing generative AI, and it is involved in a wide range of activities, from promoting projects with clients to AI implementation and AI Agent development in its own products (Track / DECA / MANA).
It is a cutting-edge environment, both technically and business-wise, where you can take on the challenge of AI development leveraging the company's own data infrastructure.

▼ Project Example
<Selection Environment Construction: Regional Bank>
Construction of a dedicated in-house environment with the aim of "linking generative AI with in-house data in an offline work environment" and "reducing the hurdle to adoption" for maximum utilization of generative AI.
● Implementation Details
Hands-on support for introduction and utilization (advice & consulting)
Construction of a dedicated in-house AI assistant
● Achieved Results
Expected annual reduction of approximately ¥1.2 billion

【Responsibilities】
You will be involved in "system development for promoting generative AI for customers" and "AI system development for in-house solutions."
・Developing unique AI prototypes tailored to specific customer use cases.
・Developing and implementing generative AI features for SaaS products.
・Implementing RAG (Retrieval-Augmented Generation) / fine-tuning in a multimodal approach, from model selection.
・Agile development based on PoC results.
・Improving RAG accuracy (LLM implementation).

▼Position Highlights
・Flexible Work Style with Fully Remote × Flextime (Office Commuting Also OK!)
You can flexibly choose your work location and hours, creating an environment where you can balance your hobbies and family!
With almost no overtime, work-life balance is excellent ◎

・Stimulating Daily Life with Highly Skilled Colleagues
Many excellent engineers, including those from GAFAM, are part of the team, creating an environment with very high technical standards.
You can learn various technologies, including AI, leading to skill enhancement!

・Proactive in Launching New Businesses & Challenging Field
The company is proactive in launching new businesses, with many opportunities for 0 to 1 challenges.
Even Givery AI Lab's in-house SaaS was proposed by an intern, and the project has started.
Additionally, there is a bi-annual evaluation cycle that leads to fair evaluation of your skills and efforts, creating an environment where growth directly translates into career and compensation.

▼ Languages Used ※No specific language is required, but the following are the primary languages used in projects:
Frontend: TypeScript, React
Backend: Python
Database: PostgreSQL (RDS), MySQL
Framework: Flask
Infrastructure: Azure, AWS, GCP


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【WELFARE】

Full Social Insurance
Commuting Allowance
Family Allowance

 

【HOLIDAYS】

Saturday/Sunday/National Holiday
Annual Paid Leave
New Year Holiday
Parental Leave
etc.

General Requirements

Minimum Experience Level Over 3 years
Career Level Mid Career
Minimum English Level None
Minimum Japanese Level Business Level
Minimum Education Level High-School
Visa Status No permission to work in Japan required

Required Skills

【Required】
・2+ years of practical development experience from the frontend to the backend of web applications.
・2+ years of management experience
・Development experience with Python.

【Preferred】
・Experience in developing/operating in-house services.
・Experience in building and operating systems using AWS or GCP.
・Experience leading a development team, including technology selection, development guideline formulation, and code reviews.

【Ideal Applicants】
・Enjoy developing in a team.
・Willing to incorporate the latest technology trends and improve their skills.
・Able to work independently and deliver value even in a remote environment.

Job Location

  • Tokyo - 23 Wards

Work Conditions

Job Type Permanent Full-time
Salary 7 million yen ~ 11 million yen
Work Hours Flextime System
Industry Internet, Web Services

Job Category

  • IT, Web and Communication > Web Developer
  • IT, Web and Communication > Software Developer
  • IT, Web and Communication > System Architect