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Backend Engineer / バックエンドエンジニア, Core Banking System at… | Swiftcruit
PayPay is a FinTech company that has grown to over 75M (as of August 2026) users since its launch in 2018. Our team is hugely diverse with members from over 50 different countries.
OUR VISION IS UNLIMITED_
We dare to believe that we do not need a clear vision to create a future beyond our imagination. PayPay will always stay true to our roots and realize a vision (future) that no one else can imagine by constantly taking risks and challenging ourselves. With this mindset, you will be presented with new and exciting opportunities on a daily basis and have the opportunity to grow and reach new dimensions that you could never have imagined. We are looking for people who can embrace this challenge, refresh the product at breakneck speed and promote PayPay with professionalism and passion. ※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation.
PayPay Bank is responsible for developing the financial infrastructure that supports the financial services of the PayPay Group. Our team is driven by our in-house engineers, from the design and development of the core system to its operation.
Our role is not just to develop functions, but to:
Evolve the system while maintaining high reliability
Design an architecture that anticipates future service expansion
Create the development organization and development process itself
Because it is a new organization, you can proactively participate in technology selection and the creation of development culture.
※ After joining the company, you are expected to be seconded to PayPay Bank as a member of the above project.
At the PayPay Group, we are accelerating the evolution of financial services across payments, banking, cards, and securities.
The banking system that forms the foundation for this requires more than ever:
Flexibility
Scalability
Development speed
High quality
To continue meeting these technical demands, we are broadly recruiting not only engineers with experience in financial system development but also backend engineers with experience in large-scale web services and platform development.
Opportunity to be involved in the modernization of financial infrastructure While maintaining the reliability of the financial system cultivated over many years, we will advance architecture improvements and feature expansions.
Mission-critical system development Because it is a financial system where downtime is not permitted, you can experience design and implementation that consider high availability, performance, and fault tolerance.
Ability to design the entire system You will be involved in the design of not only implementation but also:
Architecture
Middleware
Infrastructure
Scale unique to the PayPay Group You will be involved in system development that supports the financial services of the entire PayPay Group, not just the bank itself.
Application development for new services and improvements to existing services: ・Account opening linked with LINE, inquiry chat ・PayPay mini-app integration ・Expansion of cardless ATM usage ・Improvement of account opening processes ・Improvement of various loan services, etc.
What is differences with PayPay (Please choose the position that best aligns with your career goals, as we do not allow simultaneous applications for two positions）
Working Conditions
Employment Status
Full Time
Office Location
Hybrid Workstyle ※ You will be expected to work in the office, in alignment with organizational guidelines and team objectives.
In principle, 9:00am-5:45pm + 1h break (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
Benefits
Social Insurance (health insurance, employee pension, employment insurance and compensation insurance)
