← Back to main page

【Exa Enterprise AI（exaBase AI Business ）】Fullstack Engineer（Tech Lead Track）

Salary: 720 - 1200 百万円

Japanese only
English: FluentJapanese: Native

Minimum year of experience: 3

ExaWizards

【Exa Enterprise AI（exaBase AI Business ）】Fullstack Engineer（Tech Lead Track）

Job Description

Job Responsibilities

  • Design, develop, and release "exaBase AI" and our AI agent products
  • Take an active role in technology selection and architecture design
  • Raise the development quality of the entire team through code reviews
  • Drive full-stack development across backend, frontend, and cloud infrastructure
  • Contribute to launching new products from the ground up (0-to-1 phase)

How We Work

  • We use AI coding agents such as Claude Code as part of our everyday workflow
  • We place a strong emphasis on code reviews and pair programming
  • We prioritize code readability and maintainability in everything we build
  • We choose between agile and more flexible approaches depending on the project

Tech Stack

  • Frontend: Next.js, TypeScript, React
  • Backend: Python (Django, FastAPI), TypeScript (Fastify)
  • AI / LLM: (Azure) OpenAI API, Anthropic Claude API, Google Gemini API
  • Other: AWS, Git, Datadog, Slack, Claude Code, Amplitude, Nginx

Even if you don't have experience with every part of our tech stack, we welcome you if you have deep expertise in your core skills.

Others

  • To keep product development running smoothly, you will work from our Tokyo office once a week
    The required frequency of office attendance may change in the future.
  • Communication within the team is primarily in English, while communication with other departments is in both English and Japanese
  • At the exaBase AI business, we hold a monthly engineering study session called "EAI-dev knowledge sharing," where you can keep up with the latest technologies and insights.

Qualifications

必須スキル / Requirements

  • 3+ years of experience developing web applications
  • Experience proposing technology choices and design direction on your own initiative, and driving implementation through to release while bringing your team along
  • Basic knowledge of networking, databases, and cloud infrastructure
  • A passion for delivering high-quality products that many users continue to rely on
  • Basic knowledge of algorithms and data structures
  • Currently residing in Japan, within commuting distance of our Tokyo office
  • Experience developing products at a product-based company (not contract or outsourced development)
  • Japanese proficiency at JLPT N1 level or higher

Salary

  • Annual Salary: JPY 7.2 million – 12 million
    • Monthly Salary: Annual salary paid in 12 equal monthly installments
    • Minimum monthly salary: JPY 600,000 (base salary JPY 446,300 + fixed overtime allowance of JPY 153,700 for 45 hours)
    • Maximum monthly salary: JPY 1,000,000 (base salary JPY 743,830 + fixed overtime allowance of JPY 256,170 for 45 hours)
    • Overtime exceeding 45 hours per month will be paid separately
    • Compensation will be determined in accordance with company regulations, based on your experience, skills, and expectations
    • Depending on the nature of the role, a flextime system, a discretionary work system, or managerial (supervisory) status will apply.

Application Process

  1. Application
  2. (Optional: Casual Meeting Depending on the Situation)
  3. Document Screening
    Coding Test
  4. First, Second Interview (Online, 60 minutes / Tech Lead + Team Members)
  5. Final Interview (In-person, 60 minutes / Executive Director) *Technical Manager
  6. Job Offer

Depending on the situation, interviews may be conducted online.
If desired, we can arrange a casual meeting before the first interview to help you better understand the position.
After the first or final interview, we will hold a non-evaluative HR meeting (Online, 30 minutes).

Work Location

〒108-0023 東京都港区芝浦4丁目2−8 住友不動産三田ファーストビル5階

Working Conditions

  • Working Hours:
    Standard working hours: 9:00-18:00 (1 hour break included)
    Work style: Depending on the duties, flextime/discretionary work system or managerial/supervisory status will be applied
    Other: As of 2026, the standard rule is three days per week in the office (with exceptions for certain departments/roles)
  • Salary Increase & Bonus:
    Salary review: Twice a year (April & October) * Per company regulations
    Bonus: Twice a year (May & November) * Company performance / individual performance
  • Allowances:
    Commuting expenses (eligibility criteria apply)
  • Holidays:
    Fully two days off per week (every Saturday and Sunday), national holidays, and other year-end and New Year holidays as designated by the company.
  • Welfare:
    Employment insurance, health insurance, employees' pension insurance, workers' accident compensation insurance, employee stock ownership plan (optional), defined contribution pension plan (optional)
  • 社内のAI利活用状況:
    Employees have full access to proprietary AI products, especially exaBase AI
    Claude Code is available as a coding agent for all engineering staff (and for other roles upon request)
    Other AI tools can be used upon internal approval

Company Information

  • Date of establishment: 2016年2月
  • CEO: 代表取締役社長CEO　春田 真
  • Number of employees: 624名（連結、2026年3月末時点）
  • Capital: 24億円（2026年3月末時点）
  • Business Description:
    AIを利活用したサービス開発による産業革新と社会課題の解決
  • Headquarters:
    〒108-0023 東京都港区芝浦4丁目2−8 住友不動産三田ファーストビル5階
  • Branch Offices:
    〒530-0001 大阪府大阪市北区梅田 3-3-45 マルイト西梅田ビル5階　株式会社スタジアム内
    〒430-0927 静岡県浜松市中区旭町11-1 プレスタワー8階
    〒812-0011 福岡市博多区博多駅前 2-3-23 安田第3ビル2階　株式会社スタジアム内
  • Corporate site:
    https://exawizards.com
reco経由で応募する