Job Responsibility

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:

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

Required Skills

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

Nice-to-have Skills

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

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

Job Location

・Head Office in Tokyo (Midtown Tower 30F, 9-7-1 Akasaka, Minato-ku, Tokyo) 　Direct access from Roppongi Station 　3-min walk from Nogizaka Station 　10-min walk from Roppongi-itchome Station ・Work In the Office is currently recommended

Allowances・Benefits

・Commutation Allowance ・Social insurances (health insurance, welfare annuity insurance, employment insurance, industrial accident compensation insurance) ・Book purchase support ・Free drinks, snacks, noodles, cut fruits, and Office massage

Holidays

・Saturdays, Sundays, Japanese public holidays ・Annual leaves ・Year-end and New Year holiday ・Congratulatory and condolence leave, maternity leave, childcare leave, birthday leave, etc.

About Us

Founded in 2014, bitFlyer, Inc. operates with the mission: “Simplify the World with Blockchain.” Together with our group companies—bitFlyer USA, Inc. and bitFlyer EUROPE S.A.—we have expanded our crypto asset trading business globally. With the continued support of our customers, we’ve earned the No.1 ranking in customer satisfaction. As a licensed Crypto Asset Exchange Service Provider and Type I Financial Instruments Business Operator, we are constantly enhancing and expanding our services. Our goal is to become a highly liquid and reliable crypto asset exchange that delivers value to as many users as possible. Our founder, Yuzo Kano, has been appointed CEO of bitFlyer Holdings, Inc., and also serves as the Representative Director of both bitFlyer, Inc. and bitFlyer Blockchain, Inc. This leadership structure is designed to strengthen alignment across the group and marks a new chapter for bitFlyer. Moving forward, we remain committed to strict regulatory compliance and robust governance. As a group, we’re ta

Diversity

bitFlyer brings together high-performing individuals from a wide range of backgrounds—regardless of age, gender, or nationality. Our team includes professionals from global investment banks and securities firms, Japanese securities companies, megabanks, the Big Four accounting firms, strategy and general consulting firms, international and domestic IT companies, and Japanese startups. On the engineering side, we have members who have competed in world-class programming competitions, and over 30% of our engineers come from outside Japan. English is spoken regularly in discussions throughout the company, creating a truly diverse and global working environment.

Office Environment

bitFlyer’s headquarters is located in Tokyo Midtown, a landmark in the heart of Roppongi. Beyond the unbeatable location, our office is thoughtfully designed to support everyone in doing their best work. Whether you’re an engineer, part of the corporate team, or in a back-office role, you’ll be equipped with a high-performance PC and a large-screen monitor. We also provide ergonomic chairs selected through an employee vote to ensure comfort throughout the day. Need a specific keyboard, pen tablet, or software to do your job better? We’re more than happy to accommodate individual preferences so you can work at your full potential.