Our company operates various service platforms for cryptocurrencies (virtual currencies), including a cryptocurrency exchange. Within the Cybersecurity Department, we are responsible for security measures from a technical standpoint for our production environment, corporate environment, and against financial crimes. For this position, you will be responsible for the following tasks:

1. White-box vulnerability assessments for web applications
2. Design review from a security perspective and security improvement consulting
3. Promoting secure-by-design principles
4. Driving shift-left initiatives

Required Skills

1. Knowledge of common vulnerability types in web applications (e.g., SQL Injection, Cross-Site Scripting)
2. Experience in white-box vulnerability assessments
3. Experience using or reading object-oriented programming languages
4. Business-level proficiency in Japanese

Nice-to-have Skills

1. Knowledge of various web frameworks such as ASP.NET Web Forms, .NET Core, etc.
2. Strong communication skills to facilitate smooth collaboration with external organizations
3. Work experience in cybersecurity at a financial institution
4. Experience participating in security camps, security-related study sessions, or CTF (Capture The Flag) events
5. Experience reporting vulnerability information to organizations such as IPA or CISA

Compensation

8,000,000 – 13,000,000 yen - Monthly salary = Annual salary ÷ 12 - Breakdown of monthly salary: -- Fixed overtime pay: Equivalent to 45 hours/month = hourly wage + 25% × 45 hours -- Base salary = Monthly salary – Fixed overtime pay - Additional legal overtime, night, and holiday work exceeding 45 hours/month will be compensated separately - Various allowances (commuting, remote work, etc.) provided separately - Performance-based bonus available in addition

Employment and Work Conditions

1. Employment Type: Full-time (No fixed term)
2. Probation Period: Yes (6 months), with no changes to labor conditions during the probation period
3. Working Hours: 9:00 AM - 6:00 PM (Flextime system with core hours from 10:00 AM - 4:00 PM)
4. Break Time: 60 minutes during working hours
5. Overtime: Available
6. Smoking Prevention Measures: No smoking indoors

Ideal Traits

A Team of Responsible Professionals As of November 2024, bitFlyer supports the trading of customer assets exceeding one trillion yen across our Japan, US, and EU locations. Developing reliable systems in such a dynamic market is both highly challenging and rewarding.

We aim to be a team of professionals who can shoulder this critical responsibility. Let’s shape the next generation of finance together. - Strong commitment to compliance - Empathy with bitFlyer's MVV (Mission, Vision, Values) - Passionate and sincere attitude - Agility and adaptability to change - Logical and effective communication skills - Strong problem-setting, solving, and execution capabilities