This position is closed and is no longer accepting applications.

Software Development Engineer in Test for Data

PayPay Minato-ku, Tokyo
  • 💴 ¥7M ~ ¥14M annually
  • 🏡 Fully remote (from Japan)
  • 🧪 3+ years experience required
  • 💬 No Japanese required
  • 🌏 Apply from abroad
  • 🧳 Relocate to Japan

About PayPay

PayPay Minato-ku, Tokyo

With over 55 million registered users (as of February 2023), PayPay is the country’s most popular mobile wallet. Half of all of Japan's smartphone users are using it, and more than 2 billion payments made per year.

Key benefits

  • International engineering team
  • Japanese lessons on company time
  • Incredible scale

About the position

We are seeking a highly skilled and motivated SDET (Software Development Engineer in Test) for Data to join our Data Engineering department. In this role, you will work closely with cross-functional agile teams and data scientists to deliver projects focused on analyzing and leveraging data. You will play a crucial role in ensuring the accuracy, reliability, and quality of our data-driven insights, while working within an iterative process to tackle projects with ambiguous requirements.

As a SDET, you will be responsible for designing and implementing automated testing strategies that enable efficient and effective quality assurance of data products. Your expertise will be instrumental in identifying and preventing data anomalies, verifying data transformation processes, and ensuring data integrity throughout the project lifecycle.


  • Minimum of 3 years or more of experience in running and maintaining automated test cases, with a focus on data testing, data validity, and information architecture.
  • Minimum of 1 year experience working with data science or data platform team or related projects.
  • Expertise in Data Testing: Strong understanding of data testing principles, methodologies, and best practices. Experienced in designing and executing test scenarios to validate data integrity, accuracy, and completeness.
  • Automation Skills: Proficiency in developing and maintaining automated test scripts using Appium, Selenium, unirest/Rest Assured for APIs and Cucumber. Familiarity with CI/CD tools such as Jenkins/Bitrise or any other.
  • SQL and Database Knowledge: Solid understanding of SQL and experience in querying and manipulating data in relational databases. Ability to write complex SQL queries to validate data integrity and perform data validations across multiple data sources.

Nice to haves

While not specifically required, tell us if you have any of the following.

  • ETL (Extract, Transform, Load) and machine learning model testing experience. Familiarity with testing data pipelines, monitoring and alerting on model accuracy, and detecting model drift, among other tasks.
  • Data analytical skills or introductory-level statistical modeling.
  • Regulatory Compliance: Understanding of industry-specific regulations and experience in validating data compliance with regulatory requirements.
  • Ability to learn new technologies and set up new integrations with various data sources such as data lakes, object stores, and queues.
  • Experience in running performance tests using Gatling or similar tools.


7 to 14 million JPY annually.

Meet PayPay's Developers

Ashwini leads one of PayPay’s payment sub-teams. She got there by doing something she’s done throughout her career: identifying something she wants to do and asking to do it.

Read her story...
Photo of Yoseph Savianto

iOS Development at PayPay

with Yoseph Savianto

Yoseph joined PayPay after being attracted to their mission of making Japan a cashless society. As an iOS Engineer, he originally joined their iOS feature team, but now works on their platform team, creating an internal SDK for their iOS and Android apps.

Read his story...

Shilei started working on PayPay before it launched, and has seen it grow into a product used by tens of millions of users. He explains how diversity has helped them overcome challenges, and what PayPay is looking for in candidates.

Read his story...
Photo of Adrian Mariadas

Refactoring PayPay’s Android App

with Adrian Mariadas

Adrian came to Japan to join PayPay as an Android Engineer. As the app has grown in scope, refactoring the codebase to ensure development can continue at a rapid pace has been a big part of his job.

Read his story...

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