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Updated 2025-07-09
Activated 2025-07-09

Product Engineer [LLM New Business/Application Exploration]
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This posting is managed by: Talent Fit Japan株式会社
Company Name Company is not publicly visible
Job Type IT (PC, Web, Unix) - Business Application SE
IT (PC, Web, Unix) - Web Application SE
Location Asia Japan Tokyo Minato

Job Description As a product engineer involved in the development of new businesses using generative AI and large-scale language models (LLMs), you will lead application exploration and PoC projects mainly for enterprise companies from a technical perspective. Your mission is to materialize and implement AI utilization according to your needs, mainly for major domestic manufacturing companies, and support corporate transformation.

Specifically, you will be involved in a wide range of tasks, such as the following:

Proposal, design, technical research, and development of enterprise PoC (proof of concept) projects

Listen to customer issues and develop and improve prototypes of AI systems tailored to usage scenarios

Social implementation of cutting-edge technologies such as deep research, knowledge graphs, and in-house developed Japanese LLMs

Develop application exploration systems for external use and demo products for promotions

Promote the development process by technically incorporating the results of the AI/research team (new algorithms and LLMs) and repeating hypothesis verification in a short period of time

Continually improve services and increase value based on feedback after customer use

In addition, since this is the start-up phase of the business, you will be deeply involved in future services and team structure construction. The scope of work may change as business and technology expands in the future, but this is a position where you can expect broad growth as a "core engineer supporting growth in both business and technology."

<Attractiveness of the position>

- Utilizing advanced generative AI/LLM technology, you will be involved in "zero to one" business creation

- Participate in product creation from the very core, such as technology selection and architecture design

- An environment where you can experience social impact based on real customer reactions

- A development process that works together with PdM, designers, and engineers to increase output in a short period of time

- As the business grows, you can pursue a diverse career path, such as management or lead engineering.
Company Info Our company is a rapidly growing AI venture that supports corporate transformation through services that utilize cutting-edge generative AI and large-scale language models, with the mission of "reinventing the mechanism of value creation and advancing humanity." Our main services include search and visualization SaaS that can effectively utilize internal and external information, information structuring systems as corporate assets, and we also focus on research and development of our own LLM specialized for Japanese and business scenes.

We have already introduced our services to over 250 companies, mainly major manufacturers and R&D departments listed in the Nikkei 225, and in the future we are looking to expand beyond manufacturing to the entire enterprise field and the global market. In 2024, we will release a large-scale Japanese language model with over 100 billion parameters, and we boast a top-class presence in the industry in terms of R&D innovation and social implementation capabilities.

We have over 100 members in the company, and engineers, researchers, designers, and consultants with diverse expertise work together. We have raised a total of over 8.8 billion yen in Series D and are expanding our organizational phase. Many of our members have experience at the forefront of the AI/NLP industry and BtoB SaaS products, and we have established a culture of learning from each other about new technologies and knowledge on a daily basis.
Working Hours Flextime system (core time 10:00-14:00)
Standard working hours: 8 hours per day (8 hours per business day per month)
Average overtime hours: 10-20 hours per month
Full remote work and flexible working styles possible
Job
Requirements		 <Required conditions>

・Experience developing applications using Python

<Preferred conditions>

・Experience developing and operating in-house services for customers and BtoB services

・Full cycle experience of requirements definition, design, implementation, and operation

・Experience developing products using generative AI and LLM

・Experience developing and operating information search systems such as document search services

・Experience participating in enterprise SaaS product development

・Experience developing TypeScript/Vue.js/Node.js

<Desired profile>

・Those interested in creating innovation for enterprise companies

・Those who want to create a business using generative AI and natural language processing technology

・Those who can break down issues and get stakeholders involved to move things forward

・Those who can work in Japan and can communicate smoothly in Japanese
English Level Daily Conversation Level (TOEIC 475-730)
Japanese Level Business Level(JLPT Level 2 or N2)
Salary JPY - Japanese Yen JPY 6000K - JPY 13000K   
Other Salary
Description		 ■Monthly salary: 520,000 yen to 1,062,000 yen (including base salary + 45 hours of fixed overtime)
■"Customer-facing allowance" 20,000 yen per month (can be used for self-improvement, etc.)
■Remote work preparation lump sum: 50,000 yen paid upon joining
■Salary increase twice a year (May and November)
■Full social insurance (member of Kanto IT Software Health Insurance Association)
■Actual transportation expenses paid (mainly for remote work)
■Regular health checkups and influenza vaccinations/PC provided upon request/various drinks free (office)
■One research day per month system, onboarding and technical training upon joining
■Proven track record of maternity and childcare leave
Holidays 123 days off per year (2 days off per week/Saturdays, Sundays, and holidays)
Year-end and New Year's holidays/annual paid leave (granted upon joining the company)
Maternity and childcare leave
Job Contract
Period		 Employment type: Full-time employee
Contract period: 3-month trial period
*No difference in treatment during the trial period
Nearest Station ・Directly connected to Hibiya Station on the Tokyo Metro Chiyoda Line, Hibiya Line, and Mita Line
・4-minute walk from Yurakucho Station, 5-minute walk from Ginza Station
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