Security Engineer (Smartphone Apps)

Application Guidelines

Job Description
  • Vulnerability Assessment of Smartphone Applications
  • Security consulting

※ The exact job description will be decided based on your performance and aptitude.

Application Requirements
  • Experience in developing smartphone applications (iOS, Android)
  • Interest in security and vulnerability assessment of smartphone applications (iOS, Android) (no experience required)
Welcome Skills and Experience
  • Bug Hunting
  • Have participated in some kind of vulnerability detection programme in the past
  • Previous experience in finding vulnerabilities in applications of any kind.
  • Proven track record of security-related activities, including participation in CTFs
Monthly income from ¥400,000
  • Determined in accordance with our internal policies, taking into account performance and ability.
  • Includes a fixed overtime allowance of 20 hours.
Associated Department
Technical Analysis Division, Research and Development Department
Employment Status
Permanent Staff (3 month evaluation period)
Chiyoda-ku, Tokyo
Work Location
Tokyo HQ (Chiyoda-ku, Tokyo)
※ Remote work available (for residents of Japan)
Working Hours
Flextime system (no core time)
  • Standard working day of 8 hours
  • You may be asked to work at a specified date and time, if you have meetings or work commitments.
Twice yearly (from the second year onwards)
determined by the performance of the previous year.
Time Off
  • 2 days per week (Saturday + Sunday)
  • Public Holidays
  • New Years
  • Paid Leave
  • Special Leave (Congratulatory + Condolence Leave, Birthday Leave)
Social Insurance / Benefits
  • Full Range of Social Benefits
  • Health Checkup (Once yearly)
  • Commuting Allowance (up to 30,000 yen)
  • Moving Allowance (once only, before or after starting your position)
  • Welfare Club (Relo Club)
Language Proficiency
Japanese JLPT N3-N2 equivalent
English skills welcome but not required
Other Conditions
  • Enjoy or participate in conversation about Evangelion and Ghost in the Shell.
  • Enjoy working in the setting of "employees of an undisclosed organization that reports directly to the UN."
  • Willingness to learn new skills and technologies.
  • Enjoy working in (or not dissatisfied with) a nonhierarchical organisation.

Recruitment Process

How to Apply

Send an email to with the following requirements.
A member of our team will respond as soon as possible.

  • The body of the email should be in plain text
  • Include all of the following personal information requirements in the body of the email
  • Include answers to the following questions in the body of the email
  • Encrypt the body of the email using PGP with the public key provided below
Personal Information
  • Applicant's Name
  • Applicant's Email Address
  • Desired PositionRequired
  • Work HistoryRequired
  • MotivationRequired
  • Explain how you can help us to achieve our mission to "Make Japan Safer".Required
  • Link your GitHub account, portfolio, blog, web services you run, or any other links that show your activities. Optional
  • Let us know of any Open Source projects or Web Services that interest you.Optional
  • Let us know of any questions you may have about our company. Optional

Handling of Personal Data

Gehirn Inc. has established the following policy for the safe storage and management of personal information and the use of personal information in accordance with the wishes of applicants for employment.
Recruitment Privacy Policy

When you apply for a job, you must agree that the information you provide will be managed in accordance with our Recruitment Privacy Policy.

If you agree, please tick the 'I agree to the privacy policy' checkbox below, download the PGP public key and submit your application.