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Pub/Sub
AWS

Responsibilities

Design, develop, test, deploy, maintain and improve software and core platform
Provide architectural blueprints and technical leadership
Provides input and guidance during all phases of programs to solve challenging technical issues
Build common platforms to support different business vertical application systems
Develop tools and contribute to open source wherever possible
Adopt problem-solving as a way of life – always go to the root cause!

Preferred Qualifications

Experience in working for system development in finance, payment, or similar industries
Experience with AWS services
Contribute to open-source projects
Language ability in Japanese and English is a plus (We have a professional translator but it is nice to have language skills)

About PayPay

PayPay, a FinTech company that has achieved more than 75M (as of August 2026) 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.

Experience life in Japan

Featured life in Japan

Position

We are looking for a Principal Software Engineer to work on our various systems which need high scalability, reliability and availability. These challenges require creative thinking and a deep understanding of how software and platform work.

Our ideal candidate is an ace problem solver and a learner at heart. You should have a very high degree of comfort in a programming language of your choice. We offer a flexible work schedule and you get your choice of tools (both hardware and software) and most importantly, the opportunity to work on tough problems with the brightest minds around you. So, if challenges excite you, and you're ready for a big one, let us know.

Experience with at least one of the following

Solid foundation in designing, implementing, and maintaining a large-scale distributed system (e.g. with microservice architecture)
Experience in developing distributed platform systems such as Messaging Platforms, Pub/Sub Systems, Databases, Distributed Computing Frameworks, and Schedulers

Your qualification

Degree in Computer Engineering or Computer Science or 7+ years equivalent experience in software development
Strong fundamentals in data structure, algorithm, operating system and object-oriented programming
Deep understanding of concurrency, distributed computing, large-scale system, messaging and algorithm
Software development experience in one or more general-purpose programming languages
Interest and ability to learn new technology stacks as needed

Portrait

Unparalleled speed: Discover for yourself the important things that need to be done and implement ways to reach the best results at the fastest speed possible for the organization
Commitment: As a professional, commit to the growth and business goals of the organization and create impactful results by your ownership
Logical thinking: Think logically and structurally to bring real communication
Curiosity and questioning mind: Keep your curiosity about new things and your challenges along with a continuous questioning mind and enjoy such circumstances in a future-oriented manner
Problem solving: Take a proper approach towards both explicit and potential business/organization challenges to lead solutions involving others
True opinion and communication skill: Communicate your opinions to others in a flat manner to ensure mutual understanding and to keep things moving forward

What we offer

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

PayPay 5 senses

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

Employment Status

Full Time

Office Location

Hybrid Workstyle (flexible working style including Remote and office)
You will be expected to work both in the office and remotely, in alignment with organizational guidelines and team objectives.

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
Late overtime allowance

*Payroll payment can be changed to digital salary payment “PayPay Paycheck” for an amount set by you