Keynote

Profile

Keisuke Sogawa completed his studies at the Graduate School of Informatics at Kyoto University, and joined an IPA Mitou Youth company in 2011. He went on to launch WebPay at FluxFlex in Silicon Valley. As the Chief Technology Officer of WebPay, he developed the service infrastructure for credit card payment services. He also worked on the LINE Pay business as part of the LINE Group. He joined Mercari Group in June 2017.

The other side of the common QR code payment system of Merpay

Merpay has partnered with NTT DOCOMO, INC. in 2020 in the area of mobile payment. As part of this partnership, a common QR code can be used to make payments for both Merpay and d Barai.
In this session, I will talk about the system structure and mechanism of this common QR code payment, and the efforts to improve the reliability of the system.

Profile

ktr joined Merpay as a new graduate in 2019. He is working on the development of microservices for code payments, and the development of a common QR code payment system between Merpay and d Barai, etc. He has been writing Go since his college days, and likes to create CLI tools in Go. The HN is pronounced "kitaro".

Payment distributed transaction case study

This session will sharing Merpay payment distributed transaction management real cases. Including transaction consistency and auto recovery approaches.

Profile

Joined merpay in Oct. 2018. Currently working as Engineering Manager in payment platform team. Before join merpay, worked on Hadoop HDFS in Yahoo!JAPAN, and robot advisor THEO in Money Design. inc. Recently interested in Quality Assurance automization.

Interaction with developer communities

We think that Merpay contribute to open source softwares and developer communities, is important. We develop our service with many open source softwares and knowledge gained from developer communities. Then we give our knowledge gained via our development to developer communities and will get feedback. This talk introduces activities of the Merpay Experts team and interactions between Merpay and developer communities.

Profile

Takuya Ueda is a Go engineer for Merpay, Inc. He is one of organizer of Go Conference in Japan. He is Google Developers Expert (Go). He works for the growth of the Go community in Japan. He also loves the Go Gopher and drawing Gopher illustrations.

Multi-module development to support scalability of Merpay

At Merpay, many projects are going on at the same time, and multiple engineers are participating in each project team to develop the application. This section introduces the multi-module development that supports such large-scale development at Merpay.

Profile

I joined Merpay in 2018. I have developed Mercari integration and previous Merpay top screens. I also built the TechConf app for Mercari with Flutter and SwiftUI.

Push Unit Tests Forward as a team

Introducing the ongoing efforts of the Merpay Android team for Unit Tests.Learn how your team can improve, how you set goals, measure progress, and write tests every day.

Profile

I started Android application development in 2011. I have involved in the development of SNS applications and games. After that, I joined Merpay as an Android Engineer in October 2018. I am also involved in running conferences such as DroidKaigi.

How to develop as the Product Owner.

In the Android team of Merpay Smart Payment, we often have to develop multiple features by multiple people at the same time. I would like to introduce how the Android team tried to implove the development process to provide customers with fast and high quality products.

Profile

After working on web front-end and iOS app development, I started working on Android app development around 2012. In previous job, I developed news apps and launched payment services. I joined Merpay in 2020, I'm currently working on the Merpay smart payment function.

What we learned from systematic software improvements in large-scale mobile app development

It took about 9 months to release the Kotlin version upgrade. The effort at this time was introduced in the article "A case study and consideration of systematic software improvement in large-scale development of mobile applications". In this session, we will introduce the actual efforts made by the parties who performed the work.

Profile

Joined Mercari in 2016 as a Backend Engineer. After that I changed my job to Android Engineer. Since I have experience in developing both Mercari and Merpay, I am mainly in charge of integration for the Merpay features into the Mercari app.

Frontend Testing:
Cypress as a Testing Platform

On the Merpay frontend team, we've adopted Cypress as a primary tool to help facilitate a wide range of tests - from E2E regression testing, to integration testing, to accessibility and performance testing. This session will introduce the tools, tactics and thought process behind how we use Cypress as a testing platform.

Profile

Originally from Canada, I joined Merpay in the beginning of 2020 as a frontend engineer. Since then, I've worked across a number of Merpay's web products - including our internal merchant and customer Support tools, our Merpay partner site, and new merchant application process. Currently, I'm leading the push for better frontend testing within Merpay, and hopefully beyond!

Using Feature Store and Vertex Pipelines in Fraud Prevention System

In the ML fraud prevention team, we provide solutions for fraud detection. As the number of our solutions grew, we began to integrate our solutions and created a common pipeline for all of them. By creating a common pipeline of model training and deploying, we are able to maintain repositories more efficiently and onboard new members more smoothly. In this session, I will talk about the new integrated system architecture with the feature store and Vertex AI Pipelines.

Profile

I joined Merpay as a new graduate in 2019. I have been working on machine learning solutions for fraud prevention such as chargeback detecting. Recently, I've been involved in the development of Vertex AI based ML pipelines.

Declarative data pipeline using Dataflow Template

In Merpay, various microservices are running in collaboration with each other, and as a result, various data are exchanged.
There are many cases where similar data processing is required to move data around, and we need to avoid having to develop duplicate data processing for each team individually.
Therefore, we developed a pipeline tool that can easily execute data processing between GCP data sources by declaratively describing the processing operations.
In this session, we will introduce this tool, which is also available as OSS.

Profile

While working for a system integrator company, my personal web service became popular and I was struggling with scalability when I came across AppEngine and started using Google Cloud. Later, my hobby grew and I moved to a system company specializing in GCP.
In 2018, I joined Merpay and am currently working as a data engineer, creating data pipelines that can be used for various purposes within the company.

Building an Engineering Culture

Technology sharing can be easily improved by devising communication between developers. In this talk, we will introduce practices along two themes.
- “Technical public relations” to share the knowledge with the outside community
- "Technology sharing" to share the knowledge accumulated in product development within the company
The vision we should aim for is a culture of Technology sharing. Let's experience yourself with our case study!

Profile

I joined Mercari in 2018 and joined Merpay the following year as a TechPR, I am responsible for operating Twitter (@mercaridevjp), promoting tech blog, planning and holding technical events, and reaching out to potential hires, etc.
I manage and handle the budget of the engineering department and at the same time in charge of a wide range of projects related to the engineering organization.

Profile

I'm a Software Engineer. And Android development enthusiast. I advocate social contribution through software development and developer community.

The path of microservices migration for Merpay Smart Payment

Merpay Smart Payment which was launched in April 2019 was actualize by combining code assets for メルカリ月イチ払い, a predecessor to Merpay Smart Payment that was implemented in a monolithic system and new microservice to manage the line of credit for each customer. This session will show what we used approach to migrate functions and data in a monolithic system to microservices

Profile

I joined JustSystems as a new graduate in 2016. I engaged in designing, developing and operating microservices for the launching new service. Then joined Merpay in July 2019. I work as a backend engineer in the Credit Design team to develop microservices migration and new features related to Merpay Smart Payment.

Behind the Scenes of Merpay's Campaign - Systems to Support Growth

Merpay has been promoting many campaigns to encourage more people to use Merpay. This session will introduce the microservices that support these campaigns, their operation methods, and other behind-the-scenes technical aspects.

Profile

I joined DeNA in 2013 as a new graduate. Involved in the development of server-side and native applications through the launch and operation of new social game titles. In December 2018, I joined Merpay as a backend engineer, and is in charge of Growth UX team and Tech Lead of Merpay Coupon Microservice.

Use case of SLOs in Merpay - Let’s Define Reliability

Setting SLOs is a very effective way to ensure the reliability of services and to improve customer satisfaction. Correctly set SLOs can have a positive effect not only on customers but also on service developers and operators.
Merpay has adopted a microservices architecture, and all of them have been setting SLOs. In this presentation, Let me talking about how to set SLO for a large number of services, and how Merpay SRE thinks about the use of SLO and future issues.

Profile

Joined Merpay in 2019 and developed the infrastructure to improve the quality of services and to set SLOs. Recently, I have been working on the development of SLO-based monitoring and alerting. My hobby is designing and making keyboards.

What you need to deliver continuous service of choice for your customers ~Thinking as a QA engineer~

In this session, I will present this theme “What you need to deliver continuous service of choice for your customers” from the perspective of a QA engineer who has experienced before and after the launch of Merpay.
Smartphone payment service “Merpay” has been in service for over two years since its core launch. The speed of service development and the importance of functions have changed as the market has changed, the organization has expanded, and the business phase has changed. I will introduce some examples what I thought and what I have practiced, looking back on the history of Merpay service. Quality assurance is not just for QA engineers, so let’s think together about providing the service of choice for your customers.

Profile

I have been in charge of ERP package development and QA since 2016.I was also involved in product development and launching member development projects.
I joined Merpay as a QA engineer from July 2018. After joining the company, I was mainly in charge of the iD payment, and from April 2019 I was involved in bank connection, payment service, some campaigns, etc.
Recently, I’m in charge of a wide range of fields such as Merpay smart payment and online payment functions.

The story of a step-by-step implementation of regression test automation

In order to deliver better services to our customers as quickly as possible, the Merpay QA team is constantly repeating trial and error in our quality assurance activities. As a result, we are now able to run regression tests for multiple functions with a single command. As an example of test automation, I would like to tell you how we thought about it and how we implemented it.

Profile

I have been joined a company engaged in system integration business and worked on quality assurance of financial systems. After that, I switched to the game industry, taking advantage of my hobby of game development. After working as a client and backend engineer, I joined Merpay as a QA engineer in December 2019. I'm working on credit services, and test automation across teams.

Scenario-Based Integration Testing Platform for Microservices

Merpay has adopted the microservice architecture since the beginning of its development. Microservice architecture has many pros, but it also has some cons compared to monolithic architecture. The difficulty of integration testing to verify the interaction between microservices is one of them. This presentation will introduce the automated scenario testing platform that we have been developing for efficient integration testing.

Profile

I'm a software engineer in the Architect team at Merpay, Inc. I joined in 2018 and was involved in developing microservices related to QR code payments. Recently, I'm working on developing the scenario testing platform for microservices.

The World Is at Your Pull Request! - How to Make a Dynamic QA Environment on Kubernetes and Istio -

We are construction our system by deploying microservices to the Kubernetes cluster. In terms of the QA, we are creating one deployment for each microservice to the Kubernetes cluster which is intended to be used for development. However, it's not sufficient for doing the QA for multiple features per microservices the at the same time. To solve this problem, we have developed a custom Kubernetes controller which is creating a QA environment dynamically by integrating with Istio. In this session, I will talk about how we are using Kubernetes and Istio features to deploy a QA environment dynamically.

Profile

I joined early phase of Merpay in 2018 and have been developoing a microservice as a tech lead. From March 2019, I'm working as a Architect and investigating Kubernetes, Istio, Envoy and so on in order to solve the cross-cutting problems across the company. I'm also working as a member of Microservices Platform team and managing some CI / CD related components.