★Backend Engineer (AI Product and Infrastructure Team) | Portal Site, App Development

• Business Level Japanese Required (N2 Level)

◆ Fully Remote Work

◆ Listed Company

◆ In-house Products/Services

◆ Great Welfare

◆ Annual salary: 7 million yen - 16 million yen

【About the company】

The company's philosophy is to create a society where people all over the world can freely utilize "wisdom to live better = intellectual information" and to create a society where people can live happily.

It provides a wide range of services, including different portal sites and the Web-based cloud contract service.

【 Job Description】

【About the Service / Business Division】

The service is a core technology that integrates Generative AI into the company's proprietary database. This unique database is constructed by adding a vast amount of legal data accumulated by the company group—such as case law data, legal reference book information, records of legal consultations, and information from lawyers—to massive information sets of laws and guidelines. This data is then structured by graphing the relationships between the data points. By using this, it becomes possible to realize legal services with unprecedented utility.

【Introduction to the Recruiting Department】

・Development Division, Product Infrastructure Team

This department is responsible for developing the AI infrastructure technology that implements the company's proprietary database. The Infrastructure Team is currently working on development related to authentication and authorization.

【Recruitment Background】

To promote new product development.

Since 2022, the company has been researching and developing the social implementation of products that combine legal (law) and Generative AI. As a result, in August 2024, they announced the release of a technical foundation that graphs a massive amount of legal data—including laws, precedents, guidelines, and reference books—and combines it with Generative AI, having learned a wide range of legal expertise.

Furthermore, in May 2025, they released a product that enables lawyers and corporate legal professionals to cross-search laws and precedents.

This product has just been released and needs to be scaled further. The company is also planning the launch of new products and services, making the construction of a system to efficiently develop and operate multiple services an urgent priority.

In parallel with the growth of these products, the company is intensifying its efforts to develop the underlying technical foundation, which is why they have begun recruiting Backend Engineers. Current main development themes include the authentication/authorization foundation and the billing foundation.

【Responsibilities】

・Service requirements definition, design, and implementation.

・Project promotion to ensure smooth releases.

・Refactoring.

・Code review.

・Service improvement and operation.

・Improvement and optimization of business processes.

・Resolution of technical challenges, long-term technical selection, and formulation/execution of technical strategy.

【Development Environment】

Languages & Frameworks

Backend: PHP 8.3 / BEAR.Sunday

Frontend: TypeScript / 14

Technical Infrastructure

Infrastructure: AWS (Cognito, ECS, Lambda, S3, Redis, SES, SQS, ELB, etc.)

Database: RDS

AI/Search: Bedrock, Gemini, SageMaker, OpenSearch

Project Management & Source Code Management

Project Management: JIRA

Source Code Management: GitHub

Information Sharing & Development Support

Information Sharing: Slack, Google Workspace,

Development Support: GitHub Copilot, Cursor, NotebookLM, etc.

【Position Highlights】

・The ability to be involved in developing the foundation where legal data will be aggregated company-wide in the future.

・The opportunity to advance development with a strong focus on information architecture and system architecture in the mid-to-long term.

・Experience in different stages of product growth, from the 0-to-1 phase to the 1-to-10 phase.

・The ability to develop products in close proximity to the AI product initiatives.

【 Requirements】

【Required】

Knowledge and experience in web application development

Experience designing software architecture

Experience selecting middleware

Proactive approach to providing feedback and sincere attitude toward receiving it

【Preferred】

Experience designing, developing, and operating a service from scratch

Experience tackling technical debt and major changes in existing services

【Ideal Applicants】

Willing to engage with information architecture and system architecture over the medium to long term

Interested in new technologies and motivated to continuously learn independently

Proactive in taking initiative and actively involving others

Committed to HRT (Humility, Respect, Trust)

【Welfare】

■Housing Allowance: An allowance of up to ¥30,000 is provided to employees whose home is located less than 2km (straight-line distance) from the company office.

■Employee Stock Ownership Plan

■Defined Contribution (DC) Pension Plan

■Club Activity Subsidy System: Various clubs are organized internally to deepen interaction among employees. The company provides a partial subsidy for activity expenses when employees belong to a circle and actively participate.

■Regular Social Gatherings: To foster employee interaction, the company hosts gatherings such as a Beer Bash (held internally on a Friday once a month) and General Employee Meetings (held at an external venue with all employees present).

■Shuffle Lunch: To deepen employee interaction, once a month, the company subsidizes lunch for groups of 4-5 randomly selected employees. The company provides a subsidy of ¥1,500 per person for the lunch expense.

■Resort Support System: A system allowing employees to stay at a private, membership-based resort hotel, with access to diverse facilities such as hot springs, sports, and restaurants.

■Internal Commendation System: A system used during General Employee Meetings to recognize employees who embody excellence and serve as role models (e.g., MVP awards).

■Real Estate Brokerage Fee Discount: Employees relocating receive a discount on brokerage fees if they use the real estate agency with which the company has a corporate contract.

■Babysitter Expense Subsidy: Expenses are subsidized for employees who need to use a babysitter to attend internal events, starting with the regular social gatherings.

■Book Purchase System: The company covers the cost of purchasing books, provided certain conditions are met.

■Side Jobs (Fukugyo) Allowed: Side jobs are permitted upon approval.

■PC Provision: The standard PC provided is a MacBook Air. (MacBook Pro is provided to creative roles such as engineers and designers.)