Recruitment|Reverse Engineer / Exploit Developer

Selection Process

Step. 1 Document Screening

Please submit your resume, work history (CV), and portfolio. Based on the materials you provide, we will comprehensively review your background, skills, and motivation for applying.
We will typically notify you of the results of the document screening by email within one to two weeks.

Step. 2 Aptitude Test

We conduct a standardized aptitude test (commonly used in Japanese hiring, known as the SPI test).
This is used as an opportunity for us to get to know each other from a perspective distinct from technical skills and experience.

Step. 3 First Interview

This interview is conducted by a member of our team. We will ask about your past experience, your approach to work, and your reasons for wanting to join our company, using this as an opportunity to deepen mutual understanding.

Step. 4 Technical Assessment

By having you work on a task that closely resembles actual on-the-job work, we assess not only your knowledge and skills but also how you approach challenges and your thought process.
This is conducted either online or in person, with the level of difficulty adjusted according to the position you are applying for.

Step. 5 Second Interview

Based on the first interview and technical assessment, this interview is conducted primarily by the manager of the department you would be assigned to.
We will discuss in more concrete terms your fit with the team and your suitability for the actual work involved.

Step. 6 Final Interview

This interview is conducted by a member of our executive management or board of directors. We will share our company's vision and future direction while confirming final mutual intent.
We aim to proceed carefully so that both parties can reach a mutual understanding and start off on a positive note.

※Please note that the selection process may vary depending on the position and the status of applications.

Employment Type Full-time employee
3-month probationary period (no changes to working conditions during this period)
Work Location Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Smoking Policy Indoor smoking is permitted in designated areas.
Working Hours
  • Flextime system
  • Standard working hours: 8 hours per day
  • Core hours: 11:00 AM – 2:00 PM
Working Style This is a hybrid position based in Tokyo.
While remote work is available depending on the project and team situation, regular attendance at the Tokyo office is required. Please note that all applicants must currently reside in Japan.
Holidays and Leave
  • 122 annual holidays
  • Complete two-day weekends (Saturdays and Sundays)
  • National holidays
  • Year-end and New Year holidays
  • Substitute holidays for national holidays falling on a Saturday
  • Paid leave: 20 to 22 days per year
  • Family-friendly leave (including marriage leave, maternity/paternity leave, prenatal checkup leave, childcare leave, child nursing leave, caregiving leave, bereavement leave, etc.)
Social Insurance
  • Employment Insurance
  • Health Insurance
  • Employees' Pension Insurance
  • Workers' Accident Compensation Insurance
Visa Requirements Applicants must be eligible to work in Japan.
While the company does not cover visa application fees or related costs, we will provide necessary documents and support required for the visa application process.
Salary Annual salary system
Benefits and Welfare
  • Defined contribution pension plan (401K)
  • Commuting allowance (according to company policy)
  • Housing allowance (according to company policy)
  • Payroll savings program ("Zaikei," a Japanese asset-formation savings scheme funded through payroll deduction), with additional contributions matched by the company
  • Support for obtaining professional certifications
  • Discounted rates for various insurance products
  • Congratulatory and condolence allowance
  • Flexible benefits program, administered through third-party welfare service providers (Relo Club, Benefit One)
  • Free office drinks
  • Many unofficial employee clubs (voluntary participation)
  • Employee Bug Bounty Program
Key Responsibilities
  • Investigating vulnerabilities through reverse engineering using tools such as IDA Pro
  • Demonstrating the exploitability of vulnerabilities by writing proof-of-concept attack code in Python or C
  • Proposing remediation methods and mitigation measures for vulnerabilities that have been detected and discovered
Required Skills
  • Experience in reverse engineering using tools such as IDA, GDB, and WinDbg
  • The ability to develop exploits to demonstrate the impact of vulnerabilities
  • The ability to share your reverse engineering/exploit development results and experience, both verbally and through written materials, in Japanese (or English)
Preferred Skills
  • A track record of reporting vulnerabilities in software products
  • A track record of strong performance in CTF competitions or similar security contests
  • Experience speaking at security conferences or study groups in Japan or overseas
  • At least 2 years of hands-on experience in fields related to reverse engineering or exploit development
Ideal Candidate Profile
  • A person with abundant intellectual curiosity who enjoys understanding how software and devices work internally
  • A person who is comfortable reading and interpreting datasheets and technical specifications
  • A person who can clearly define the purpose and goals of the work they are about to undertake
  • A person who can select the appropriate approach to solving a given problem
  • A person who can share their knowledge and insights with others at an appropriate level of detail
  • A person who actively engages in technical communication, including the ability to give candid and constructive feedback
Employment type
Full-time employee
3-month probationary period (no changes to working conditions during this period)
Work Location
Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Smoking Policy
Indoor smoking is permitted in designated areas.
Working Hours
  • Flextime system
  • Standard working hours: 8 hours per day
  • Core hours: 11:00 AM – 2:00 PM
Working Style
This is a hybrid position based in Tokyo.
While remote work is available depending on the project and team situation, regular attendance at the Tokyo office is required. Please note that all applicants must currently reside in Japan.
Holidays and Leave
  • 122 annual holidays
  • Complete two-day weekends (Saturdays and Sundays)
  • National holidays
  • Year-end and New Year holidays
  • Substitute holidays for national holidays falling on a Saturday
  • Paid leave: 20 to 22 days per year
  • Family-friendly leave (including marriage leave, maternity/paternity leave, prenatal checkup leave, childcare leave, child nursing leave, caregiving leave, bereavement leave, etc.)
Social Insurance
  • Employment Insurance
  • Health Insurance
  • Employees' Pension Insurance
  • Workers' Accident Compensation Insurance
Visa Requirements
Applicants must be eligible to work in Japan.
While the company does not cover visa application fees or related costs, we will provide necessary documents and support required for the visa application process.
Salary
Annual salary system
Benefits and Welfare
  • Defined contribution pension plan (401K)
  • Commuting allowance (according to company policy)
  • Housing allowance (according to company policy)
  • Payroll savings program ("Zaikei," a Japanese asset-formation savings scheme funded through payroll deduction), with additional contributions matched by the company
  • Support for obtaining professional certifications
  • Discounted rates for various insurance products
  • Congratulatory and condolence allowance
  • Flexible benefits program, administered through third-party welfare service providers (Relo Club, Benefit One)
  • Free office drinks
  • Many unofficial employee clubs (voluntary participation)
  • Employee Bug Bounty Program
Key Responsibilities
  • Investigating vulnerabilities through reverse engineering using tools such as IDA Pro
  • Demonstrating the exploitability of vulnerabilities by writing proof-of-concept attack code in Python or C
  • Proposing remediation methods and mitigation measures for vulnerabilities that have been detected and discovered
Required Skills
  • Experience in reverse engineering using tools such as IDA, GDB, and WinDbg
  • The ability to develop exploits to demonstrate the impact of vulnerabilities
  • The ability to share your reverse engineering/exploit development results and experience, both verbally and through written materials, in Japanese (or English)
Preferred Skills
  • A track record of reporting vulnerabilities in software products
  • A track record of strong performance in CTF competitions or similar security contests
  • Experience speaking at security conferences or study groups in Japan or overseas
  • At least 2 years of hands-on experience in fields related to reverse engineering or exploit development
Ideal Candidate Profile
  • A person with abundant intellectual curiosity who enjoys understanding how software and devices work internally
  • A person who is comfortable reading and interpreting datasheets and technical specifications
  • A person who can clearly define the purpose and goals of the work they are about to undertake
  • A person who can select the appropriate approach to solving a given problem
  • A person who can share their knowledge and insights with others at an appropriate level of detail
  • A person who actively engages in technical communication, including the ability to give candid and constructive feedback

How to Apply

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Please note that we do not accept inquiries related to recruitment by phone.