Remote

Backend Engineer

Remote OK - Anywhere in Japan
Full-time
May 19, 2026

Job Description

PayPay Securities, as an important part of PayPay’s financial ecosystem, has launched “Point Management” with over 20 million users and “PayPay Asset Management, the first initiative in Japan that enables asset management on a payment application. Now that the business foundation of the financial ecosystem is finally in place, we intend to expand our business to change the structure of asset management in Japan, with the main target being those who have not yet started asset management or were not interested in it before.

To achieve our goal, PayPay Securities is preparing to bring in technical talents not only from Japan but also globally, just as we have done with PayPay’s product division. As a Backend Engineer, you will be collaborating with engineers, designers and QAs, and working in an environment where you can be one of the founding members to build up a new organization within PayPay Securities.

※ Please note that this job is for Japan Residents Only

Highlights of the opportunity :

Be part of the team to build up a new organization and environment
Develop skills in making business plans from a high perspective, through the high-level coordination with departments and affiliated companies within PayPay Group to support the top management’s decision
Gain experience in a company that aiming to be the pioneer in the market to provide a brand new Mobile Securities services, which never had before during the era of Financial reformation
Able to utilize PayPay’s services and user base

Responsibilities :

Develop and operate the Backend Application system for PayPay Securities product (PHP, Java, SpringBoot, Kotlin, MySQL/AuroraDB)
Design large scale systems with high complexity to support our high throughput applications
Understand how to leverage infrastructure for solving such large scale problems
Develop tools and contribute to open source wherever possible
Adopt problem solving as a way of life – always go to root cause!

Qualifications :

3-5 experience in developing Backend Application for company products
Experience in using Java/PHP under professional environment, or if you are non-Java user, excellent skills in generalized programming languages, such as Scala, Python and Go.
Interest and ability to learn other coding languages as needed.
Experience with NoSQL databases and distributed cache.
Strong fundamentals in data structures, algorithms and object oriented programming
In-depth understanding of concurrency and distributed computing
Degree in Computer Engineering or Computer Science or 5+ years equivalent experience in SaaS platform development
Business level in either English or Japanese (JLPT N1)

Preferred Qualifications :

Experience with implementing platform components such as RESTful APIs, Pub/Sub Systems, Database Clients
Experience with AWS services
Experience in system design, development of web system which handles massive amount of transactions or requires scalability
Experience with Microservices
Experience in working for system development in securities, finance, or similar industries
Experience in developing inhouse Product/Service

APPLY NOW ➜🇯🇵 Residents Only

About PayPay Securities

PayPay Securities, as an important part of PayPay’s financial ecosystem, has launched “Point Management” with over 10 million users and “PayPay Asset Management", the first initiative in Japan that enables asset management on a payment application.

Now that the business foundation of the financial ecosystem is finally in place, PayPay Securities intends to expand its business to change the structure of asset management in Japan, with the main target being those who have not yet started asset management or were not interested in it before.

Japanese Language Policy
PayPay Securities started internationalizing their product teams in 2024. They are looking for someone who has business English proficiency, an open mind to embrace Japanese culture, and curiosity towards Securities.

PayPay Securities is on the move of creating an international-friendly environment like PayPay's Product Division, where English is the main language, and having interpreters who can provide simultaneous translation when necessary.

Please note that:
- For Engineers, Japanese language skills are not required but are beneficial to have.
- For Product Managers and Product Designers, business-level Japanese is a must.
Paid Leave
PayPay Securities offers National holidays (in Japan), Summer break (2 days), Year-End and New Year Holidays.

They also offer annual leave (1 to 10 days, depending on the month of joining, will be granted upon employment date for the 1st year).
Benefits
👶 Parental Leave

🧡 Interpretation support

💟 Complete health and social insurance

💚 Translation support
Engineer Interview Process
PayPay Securities hiring process are as below:

(1) Application Review (English CV is required)
(2) Coding Test or Take Home Assignment (only applied to required positions)
(3) 2-3 Interviews (including both technical and behavioral interview)
(4) Offer Meeting
Highlights of PayPay Securities

PayPay Securities is part of PayPay Group

PayPay is a FinTech company that has grown to over 65M users (as of August 2024) since its launch in 2018, and is rapidly expanding its business scale as a payment platform used by approximately one in two smartphone users in Japan. PayPay Securities provides a unique and familiar asset management service that anyone can easily use in their daily lives as a specialized smartphone brokerage firm that can be used through PayPay. As a member of the PayPay Group, they are refining their products at an overwhelming speed, and promoting the spread of cashless payments in Japan.

Establishing a foundation for the second startup phase
PayPay Securities is aiming to change the structure of asset management in Japan. To achieve this goal, they are establishing a foundation for the second startup phase. You will be able to be involved in redesign and renewal of existing products, gain experience from providing new mobile securities services and utilize PayPay’s service and user base to create a direct impact to Japan’s society.

Opportunity to take part in internationalizing engineering division
PayPay Securities is on the move to create an international friendly environment and welcome talents from all over the world to join. They want to improve their engineering practices to meet worldwide industry standards and are targeting to internationalize the engineering division, improve cross-company interaction and insist on creating user friendly products that are easy to understand and fun to use.