Product Security Engineer (Infrastructure)

Tokyo, Japan

PayPay

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About PayPay

PayPay, a FinTech company that has achieved more than 70M (as of July 2025) since its launch in 2018, is rapidly expanding its business scale as a payment platform used by approximately one out of every two smartphone users in Japan.

The company has a diverse team of professionals from more than 50 countries and is building a world-class engineering organization.

Our biggest competitor is "cash".

They are seeking people who can accept this challenge positively, brush up on the product at a tremendous speed that other companies could never achieve, and who are passionate about promoting and spreading such a financial life platform in a short time along with professionalism.

PayPay is committed to maintaining a "Day 1" mindset, bringing to life visions of the future that no one else can even imagine.

At PayPay, we provide an environment where everyone can deliver outstanding performance as professionals, through a flexible work style that includes remote and office.

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Position

The PayPay Product Security team is looking for experienced infrastructure security engineers to lead improvements to our infrastructure and operational security, and introduce key security solutions.

About

PayPay Product Security team is responsible for driving the application security and infrastructure security changes within the product division - the part of PayPay responsible for development and operations of the PayPay app.

A strong candidate for the infrastructure security engineer position will be knowledgeable about modern infrastructure solutions (such as Kubernetes, various public clouds and their services, message brokers and so on), security challenges and threats relevant to them, and have experience in one of the following areas:

Leading projects to improve infrastructure security at scale (e.g. introducing role-based access control, hardening K8s configurations, introducing temporary access credentials for database access, and so on)
Introducing and improving security orchestration and automation, as well as solution to gather, store and analyze security events and assets

Primary Responsibilities

Analyzing security risks relevant to the production infrastructure
Designing security measures for the product infrastructure environment
Implementing and running security solutions (SIEM, vulnerability management, network security, cloud security, container security, etc.)
Improve security incident handling within product division.
Improving observability and monitoring for security information and events.
Assisting infrastructure teams in prioritizing security goals

Supporting Responsibilities

Assisting infrastructure teams in implementing and running secure solutions
Participating in major infrastructure projects as a security expert

Your qualification

2+ years of infrastructure security or relevant experience
Solid understanding of security principles, protocols, and best practices
Solid programming skills in one or more programming languages, such as Java, Python, Golang
Experience leading projects in any kind of security solutions, such as CNAPP, PAM, IDS/IPS, SIEM, SOAR, WAF, NGFW, etc
Hands-on experience with cloud platforms, preferably AWS
Hands-on Terraform experience. Experience with other IAC tools is also acceptable
Hands-on experience with CI/CD pipelines and tools like Github Action, Jenkins, ArgoCD, etc
Strong teamwork skills and the ability to collaborate with others in a diverse environment
Enjoy taking up a challenge and driving it to a conclusion

Will be a plus

Previous experience working in DevOps, SRE, or similar roles
Experience working with microservice-based systems
Experience working in a security position within the fintech industry
Native or business level Japanese proficiency

What we offer

Social Insurance (health insurance, employee pension, employment insurance and compensation insurance)
401K
Translation/Interpretation support
VISA sponsor + Relocation support

Additional details

PayPay 5 senses

Please refer PayPay 5 senses to learn what we value at work.

Working Conditions

Employment Status

Full Time

Office Location

Hybrid Workstyle (flexible working style including Remote and office)
There are no fixed rules regarding office attendance in Product group; it depends on each individual's discretion.
LIFE in JAPAN FACTBOOK

Work Hours

Super Flex Time (No Core Time)

In principle, 9:00am-5:45pm (actual working hours: 7h45m + 1h break)

Holidays

Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days

Paid leave

Annual leave (up to 14 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire)
Personal leave (5 days each year, granted proportionally according to the month of employment)

PayPay's own special paid leave system, which can be used to attend to illnesses, injuries, hospital visits, etc., of the employee, family members, pets, etc.

Salary

Annual salary paid in 12 installments (monthly)
Based on skills, experience, and abilities
Reviewed once a year
Special Incentive once a year *Based on company performance and individual contribution and evaluation
Late overtime allowance
Payroll payment can be changed to digital salary payment "PayPay Paycheck" for an amount set by you

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