Recruitment｜Cyber Defense Institute, Inc.

At Cyber Defense Institute, all our members possess exceptional abilities in their chosen specialization.

We work in collaboration with world-class security experts both within Japan and from overseas to provide security services to our clients. The quality of our services always comes down to the “people” – the individuals and their contributions. We invite you to join us and put your skills to use in collaboration with our engineers, working hard together to benefit customers, and society as a whole. In combination with and through friendly competition, join your colleagues in further cultivating and polishing your skills.

Cyber Defense Institute believes in building a working environment that prioritizes freedom where your ideas to improve the security of clients, and build your own skills are made possible. We look forward to hearing from you!

Threat Intelligence Analyst

Infrastructure Engineer

Application Development Engineer

Security Engineer (Reverse Engineer / Exploit Developer)

Corporate Sales

Product Marketing

Employment type	Full-time employee
Work Location	Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description	Prepare reports by independently analyzing technical content of domestic and international threat information and vulnerability information, both public and private. Provide consulting services related to threat intelligence services for clients. Provide technical support for incident response and red team operations.
Essential criteria	Basic knowledge of computer science (operating systems, network infrastructure, security, etc.) Expertise in cyber security (malware analysis, OSINT, threat intelligence, etc.) At least one programming language skill
Preferred Skills	Expertise in attributing campaigns and threat actors based on TTPs, infrastructure, and malware similarities Experience presenting at domestic and international security conferences Experience in writing threat research reports Specialized knowledge in geopolitics, international affairs, and security studies

Employment type Full-time employee
Work Location Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description Prepare reports by independently analyzing technical content of domestic and international threat information and vulnerability information, both public and private. Provide consulting services related to threat intelligence services for clients. Provide technical support for incident response and red team operations.
Essential criteria Basic knowledge of computer science (operating systems, network infrastructure, security, etc.) Expertise in cyber security (malware analysis, OSINT, threat intelligence, etc.) At least one programming language skill
Preferred Skills Expertise in attributing campaigns and threat actors based on TTPs, infrastructure, and malware similarities Experience presenting at domestic and international security conferences Experience in writing threat research reports Specialized knowledge in geopolitics, international affairs, and security studies

Employment type	Full-time employee
Work Location	Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description	Security service development Maintenance and improvement of internal infrastructure Design of new services
Essential criteria	At least 3 years of experience in implementing, maintaining, managing, and troubleshooting infrastructure services At least 3 years of experience working in a Linux environment Technical proficiency equivalent to the Fundamental Information Technology Engineer Examination Willingness to work with public key authentication, on-premises environments, and Command-Line Interfaces
Preferred Skills	Experience with automation and deployment strategies for server systems and desktop computers using Ansible, Active Directory GPO, or Intune Ability to build cooperative relationships and communicate effectively with IT infrastructure teams, security teams, and internal infrastructure users Understanding of virtualization technologies such as HyperV, KVM, and VMware, as well as container technologies Experience in identity management Knowledge and experience with Public Key Infrastructure (PKI), including x509 digital certificates Knowledge and experience in log monitoring and visualization Development experience with Python or Golang Experience and understanding of essential network protocols such as DNS, NTP, and HTTP System design capabilities Experience in internal activities related to team building and knowledge sharing Ability to align customer needs with technical solutions

Employment type Full-time employee
Work Location Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description Security service development Maintenance and improvement of internal infrastructure Design of new services
Essential criteria At least 3 years of experience in implementing, maintaining, managing, and troubleshooting infrastructure services At least 3 years of experience working in a Linux environment Technical proficiency equivalent to the Fundamental Information Technology Engineer Examination Willingness to work with public key authentication, on-premises environments, and Command-Line Interfaces
Preferred Skills Experience with automation and deployment strategies for server systems and desktop computers using Ansible, Active Directory GPO, or Intune Ability to build cooperative relationships and communicate effectively with IT infrastructure teams, security teams, and internal infrastructure users Understanding of virtualization technologies such as HyperV, KVM, and VMware, as well as container technologies Experience in identity management Knowledge and experience with Public Key Infrastructure (PKI), including x509 digital certificates Knowledge and experience in log monitoring and visualization Development experience with Python or Golang Experience and understanding of essential network protocols such as DNS, NTP, and HTTP System design capabilities Experience in internal activities related to team building and knowledge sharing Ability to align customer needs with technical solutions

Employment type	Full-time employee
Work Location	Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description	Development of our PIV Gateway Service Authentication using x509 and attribute certificates Authorization flow implementation Development aligned with customer needs Product structuring and utilization
Essential criteria	At least 3 years of development experience with JavaScript, Python, or Golang Technical proficiency equivalent to the Fundamental Information Technology Engineer Examination Willingness to work with public key authentication, on-premises environments, and Command-Line Interfaces
Preferred Skills	Understanding of virtualization technologies such as HyperV, KVM, and VMware, as well as container technologies Experience in authentication management Experience developing and utilizing TPM, HSM, or PKCS11 Development experience with Erlang, Golang, or gRPC Experience in Web API design Understanding of IAM in cloud services System design capabilities Ability to align customer needs with technical solutions Experience in internal activities related to team building and knowledge sharing

Employment type Full-time employee
Work Location Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description Development of our PIV Gateway Service Authentication using x509 and attribute certificates Authorization flow implementation Development aligned with customer needs Product structuring and utilization
Essential criteria At least 3 years of development experience with JavaScript, Python, or Golang Technical proficiency equivalent to the Fundamental Information Technology Engineer Examination Willingness to work with public key authentication, on-premises environments, and Command-Line Interfaces
Preferred Skills Understanding of virtualization technologies such as HyperV, KVM, and VMware, as well as container technologies Experience in authentication management Experience developing and utilizing TPM, HSM, or PKCS11 Development experience with Erlang, Golang, or gRPC Experience in Web API design Understanding of IAM in cloud services System design capabilities Ability to align customer needs with technical solutions Experience in internal activities related to team building and knowledge sharing

Employment type	Full-time employee
Work Location	Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description	Investigate software vulnerabilities through reverse engineering using tools such as IDA Pro Develop proof-of-concept exploits for vulnerabilities using Python or C Propose remediation and mitigation strategies for identified vulnerabilities
Required Experience	Experience in reverse engineering using tools such as IDA, GDB, or WinDbg Ability to develop exploits to demonstrate vulnerabilities Capability to share reverse engineering and exploit development findings and experiences through presentations and written documentation in Japanese or English
Preferred Skills	Track record of vulnerability disclosures in commercial software products Achievements in Capture The Flag (CTF) competitions or similar cybersecurity contests Experience speaking at domestic or international security conferences or study groups Over two years of professional experience in fields related to reverse engineering or exploit development
Ideal Candidate Profile	Highly intellectually curious and enjoys understanding the inner workings of software and devices Comfortable reading datasheets and technical specifications Able to clearly define the objectives and goals of new tasks Capable of choosing appropriate solutions to tackle technical challenges Willing and able to share knowledge and information at the right level of detail Proactively engages in technical communication and provides candid feedback to peers

Employment type Full-time employee
Work Location Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description Investigate software vulnerabilities through reverse engineering using tools such as IDA Pro Develop proof-of-concept exploits for vulnerabilities using Python or C Propose remediation and mitigation strategies for identified vulnerabilities
Required Experience Experience in reverse engineering using tools such as IDA, GDB, or WinDbg Ability to develop exploits to demonstrate vulnerabilities Capability to share reverse engineering and exploit development findings and experiences through presentations and written documentation in Japanese or English
Preferred Skills Track record of vulnerability disclosures in commercial software products Achievements in Capture The Flag (CTF) competitions or similar cybersecurity contests Experience speaking at domestic or international security conferences or study groups Over two years of professional experience in fields related to reverse engineering or exploit development
Ideal Candidate Profile Highly intellectually curious and enjoys understanding the inner workings of software and devices Comfortable reading datasheets and technical specifications Able to clearly define the objectives and goals of new tasks Capable of choosing appropriate solutions to tackle technical challenges Willing and able to share knowledge and information at the right level of detail Proactively engages in technical communication and provides candid feedback to peers

Employment type	Full-time employee
Work Location	Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description	Communication with clients Communication with engineers Proposing solutions to clients Project management (schedule coordination/progress management) Sales administration tasks such as contract procedures
Essential criteria	Sales experience in the IT industry Experience in tasks such as estimation, order processing, contract execution, delivery inspection, and invoicing
Preferred Skills	Sales experience at an SIer (System Integrator) Experience in sales to government agencies Knowledge of the cybersecurity field Sales experience in penetration testing, forensics, and intelligence

Employment type Full-time employee
Work Location Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description Communication with clients Communication with engineers Proposing solutions to clients Project management (schedule coordination/progress management) Sales administration tasks such as contract procedures
Essential criteria Sales experience in the IT industry Experience in tasks such as estimation, order processing, contract execution, delivery inspection, and invoicing
Preferred Skills Sales experience at an SIer (System Integrator) Experience in sales to government agencies Knowledge of the cybersecurity field Sales experience in penetration testing, forensics, and intelligence

Employment type	Full-time employee
Work Location	Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description	【Driving Business Growth by Establishing Mechanisms to Expand Product and Service Sales and Increase Revenue】 Promote awareness of products and services. Define and deliver appropriate messaging that communicates the value of products and services to target customers, motivating adoption. Manage agreements with distributors and direct sales partners. Plan, execute, and evaluate sales strategies and initiatives based on product/service value and market conditions. Identify elements or risks that hinder sales, and develop and implement rational risk mitigation or elimination strategies in collaboration with stakeholders. Identify barriers to product/service adoption for customers, and plan and implement systems that enable efficient implementation. 【Promoting Product Development that Drives Customer Selection】 Provide ongoing communication with customers to support improved security measures through product implementation. Collect, analyze, and propose responses based on customer feedback, and relay those insights to the product development team. Identify risks or factors that negatively impact product retention, find common issues, and share them with the development team for resolution. Communicate and report effectively to stakeholders through appropriate methods. 【Work in close coordination with the product development department to achieve common goals through teamwork.】
Required Experience	Experience in product marketing and branding for cloud-based or packaged products. Experience in planning, developing, and executing go-to-market strategies for packaged or online services. Proven track record in analyzing facts, identifying bottlenecks and issues, formulating strategic initiatives, prioritizing resources, and executing action plans.
Essential criteria	Insight and analysis based on factual data Reporting skills Document writing skills Ability to translate technical or business information into appropriate messaging for prospective customers Ability to conduct market analysis and plan and execute marketing strategies Ability to demonstrate leadership in responsibilities while collaborating with other team members
Preferred Skills	Experience with product launches Experience in copywriting Market analysis expertise

Employment type Full-time employee
Work Location Ochanomizu First Building 5F, 2-5-1, Kanda Surugadai, Chiyoda-ku, Tokyo, Japan, 101-0062
Job Description 【Driving Business Growth by Establishing Mechanisms to Expand Product and Service Sales and Increase Revenue】 Promote awareness of products and services. Define and deliver appropriate messaging that communicates the value of products and services to target customers, motivating adoption. Manage agreements with distributors and direct sales partners. Plan, execute, and evaluate sales strategies and initiatives based on product/service value and market conditions. Identify elements or risks that hinder sales, and develop and implement rational risk mitigation or elimination strategies in collaboration with stakeholders. Identify barriers to product/service adoption for customers, and plan and implement systems that enable efficient implementation. 【Promoting Product Development that Drives Customer Selection】 Provide ongoing communication with customers to support improved security measures through product implementation. Collect, analyze, and propose responses based on customer feedback, and relay those insights to the product development team. Identify risks or factors that negatively impact product retention, find common issues, and share them with the development team for resolution. Communicate and report effectively to stakeholders through appropriate methods. 【Work in close coordination with the product development department to achieve common goals through teamwork.】
Required Experience Experience in product marketing and branding for cloud-based or packaged products. Experience in planning, developing, and executing go-to-market strategies for packaged or online services. Proven track record in analyzing facts, identifying bottlenecks and issues, formulating strategic initiatives, prioritizing resources, and executing action plans.
Essential Criteria Insight and analysis based on factual data Reporting skills Document writing skills Ability to translate technical or business information into appropriate messaging for prospective customers Ability to conduct market analysis and plan and execute marketing strategies Ability to demonstrate leadership in responsibilities while collaborating with other team members
Preferred Skills Experience with product launches Experience in copywriting Market analysis expertise

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