Back-end engineer - Kotlin

English environment

■ Job Title

Back-end engineer - Kotlin

■ Company Overview

One of the top Japanese IT company with B2C products.

■ Your Role and Responsibilities

Develop and maintain services written in both Kotlin and Perl

Promote and drive new development in Kotlin, while gradually migrating legacy components from Perl when updating existing features

Lead backend development for user-facing service functionality

Architect systems that improve performance, scalability, and modularity

Design and build highly available, reliable, and fault-tolerant backend services

Mentor team members and advocate for software development and operational excellence

Collaborate across teams and engage actively in code and design reviews to uphold high development standards

■ Experience and Qualifications

5+ years of experience in backend/server-side application development

Proven ability to manage technical issues and respond to production incidents

Proficiency with scalable data storage solutions, particularly MySQL

Solid understanding of core computer science principles

Business-level proficiency in either Japanese or English (spoken)

Business-level proficiency in English (written)

■ Preferred Experience/Skills

Experience with tuning and monitoring applications running on the JVM

Proficiency in Kotlin for backend development

Experience leading or mentoring technical teams

Experience building applications deployed on Kubernetes

■ Good Reasons to Join

● Flexible work-from-home arrangement/ international team
● Competitive salary and benefits

■ Work Location

Tokyo

*Flexible time with full remote

■ Salary 

Negotiable

■ Contract term (we need to give a very detailed description if it’s a fixed-term contract!)

Permanent

Details will be provided during the meeting.

One of the top Japan’s financial company with international environment.

■ Your Job Title: QA Engineer (Automation)

■ Company Overview

Our Client delivers a credit and Fin-Tech service that’s more accessible, integrated and convenient than traditional options on the market. That's why millions of people have on-boarded with their products already, and the number is growing fast!

We’re looking for passionate individuals for this team to drive product innovation and enhance quality at lightning speed, helping to deliver a truly amazing financial life platform.

■ Your Role and Responsibilities 

As a QA specialist focused on test automation, you will ensure product development quality through the following responsibilities:

• Plan, execute, and maintain automated test strategies.
• Automate tests and QA tasks, ensuring smooth integration with development teams.
• Analyze test results, report findings, and propose process improvements.
• Manage the QA team and enhance test efficiency, coverage, and effectiveness.
• Recommend and implement tools and technologies to improve product development quality.

■ Experience and Qualifications

• 5 years of experience maintaining automated test cases for mobile apps, web apps, or APIs.
• Proficiency with frameworks/tools such as Appium, Selenium, Cypress, Playwright, or Rest Assured.
• Hands-on experience with E2E test automation and API testing using Postman.
• Familiarity with CI/CD tools like Jenkins or Bitrise.
• Strong communication, documentation, and software testing skills.
• Ability to identify process challenges and propose improvements.
• Effective collaboration with development teams and stakeholders.
• Commitment to continuous learning in QA and new technologies.
  •  

■ Additional Preferred Qualifications

• Experience with automation testing in Agile environments.
• Native-level Japanese or JLPT N1 (or equivalent) proficiency (non Japanese speakers are welcome to apply, however please note that Japanese speakers may be prioritized)
• Proficiency with Cucumber for test cases.
• Coding experience in web or mobile app development.
• Background in test automation for the credit card or financial industry.
• Experience managing in-house services.
• Expertise in designing and implementing CI/CD pipelines.
• Development experience with AWS.

 ■ Other Points and Working Conditions

• This is a full-time position
• Flexible working hours 
• Holidays: Weekends, Japanese national holidays, New Year's holidays and special company holidays
• Leave allowance: annual paid leave and other forms of paid leave
• Non-salary benefits: Japanese social insurances, Japanese 401K, language learning support, visa sponsorship, relocation support

■ Work Location

Fully remote

■ Salary 

~9M, negotiable

■ Position/Contract Term

Permanent position

One of the top Japan’s financial company with international environment.

■ Your Job Title: QA Engineer (Manual)

■ Company Overview

Our Client delivers a credit and Fin-Tech service that’s more accessible, integrated and convenient than traditional options on the market. That's why millions of people have on-boarded with their products already, and the number is growing fast!

We’re looking for passionate individuals for this team to drive product innovation and enhance quality at lightning speed, helping to deliver a truly amazing financial life platform.

■ As the Ideal Candidate, You Are: 

• Excited to shape the QA process (regression testing, functional testing, quality improvement) as a founding member of the core system QA group.
• Interested in QA for the credit card lifecycle and core system functionality.
• Brings experience as a QA Manager, Leader, or test designer, with a proactive mindset.
• Thrives in an international, diverse environment.
• Motivated to take on new challenges for personal and professional growth.

■ Your Role and Responsibilities 

You will oversee QA tasks to ensure high-quality, user-friendly product development. Responsibilities include:

• Managing and updating quality standards.
• Leading the QA team and testing processes.
• Designing and executing tests for agile projects.
• Reporting test results and providing feedback.
• Collaborating with developers, designers, and directors.
• Proposing and implementing process improvements.
• Drafting proposals, contracts, and approval requests.
• Creating user manuals.

■ Experience and Qualifications

• 5+ years as a QA Engineer with web or mobile (iOS/Android) applications.
• Skilled in analyzing technical specifications and creating/executing test plans.
• Experience in fast-paced IT/Web environments (agile experience is a plus).
• Proven ability to standardize QA processes and propose improvements.
• Effective communicator with development teams and stakeholders.
• Familiarity with QA tools (e.g., Zephyr, TestRail, ALM, etc.).
• Strong attention to detail, organizational, and problem-solving skills.
• Excellent verbal communication and documentation abilities.

■ Additional Preferred Qualifications

• Experience with automation testing in Agile environments.
• Native-level Japanese or JLPT N1 (or equivalent) proficiency (non Japanese speakers are welcome to apply, however please note that Japanese speakers may be prioritized)
• Proficiency with Cucumber for test cases.
• Coding experience in web or mobile app development.
• Background in test automation for the credit card or financial industry.
• Experience managing in-house services.
• Expertise in designing and implementing CI/CD pipelines.
• Development experience with AWS.

 ■ Other Points and Working Conditions

• This is a full-time position
• Flexible working hours 
• Holidays: Weekends, Japanese national holidays, New Year's holidays and special company holidays
• Leave allowance: annual paid leave and other forms of paid leave
• Non-salary benefits: Japanese social insurances, Japanese 401K, language learning support, visa sponsorship, relocation support

■ Work Location

Fully remote

■ Salary 

~8M, negotiable

■ Position/Contract Term

Permanent position

Do you want to join a Fin-Tech company to start new career in Japan?

Require only English.

■ Job Title: Senior backend Engineer

■ Company Overview

Recently provide CashFlow Card, give users with more accessible and convenient fintech services that were previously not possible with credit cards and credit services by integrating with the CashFlow payment platform. We are looking for professionals who are passionate about refining our products at an overwhelming speed that no other company can match, and promoting the spread of cashless payments in Japan and the financial life platform that uses them. 

■ Your Role and Responsibilities 

• Design and oversee the implementation of large-scale, complex systems.
• Manage team stakeholders including product managers, frontend engineers, other team leads, and non-technical stakeholders.
• Utilize infrastructure to address large-scale challenges effectively.
• Serve as a gatekeeper to maintain team quality standards.
• Prioritize, debug, and resolve product issues and incoming inquiries.
• Mentor other team members and uphold team quality standards.

• Back-end services:
o Main implementations are in Spring Boot, with a mix of Java 11/Spring Boot 2 and Java
17/Spring Boot 3.
o Some legacy systems are written in Java EE.
o Testing is done with JUnit and Mockito
o Deployment relies on AWS ECS
o CI/CD is handled by AWS CodePipeline
• Infrastructure
o All our services run in AWS
o Infrastructure is managed by AWS CloudFormation
o AWS CloudWatch is used for observability
• Coding environment: GitHub, IntelliJ, Gradle
• Documentation & Project management: Confluence, Miro, JIRA
• Communication: Slack, Zoom, Office 365

■ Experience and Qualifications

Proficiency in any object-oriented programming language such as Kotlin, Java, C#, or Scala.

Hands-on experience with both relational and NoSQL databases, as well as distributed caching systems.

Solid foundation in data structures, algorithms, and object-oriented design principles.

Comprehensive knowledge of concurrency and distributed systems.

Bachelor's degree in Computer Engineering or Computer Science, or at least 5 years of equivalent experience in SaaS platform development.

Business-level proficiency in English.

■ Additional Preferred Qualifications

Proficiency in Java and the Spring Boot framework.

Hands-on experience in developing platform components, including RESTful APIs, Pub/Sub systems, and database clients.

Expertise in designing scalable systems for high-traffic applications.

Strong knowledge of microservices and event-driven architecture.

Experience in designing and implementing gRPC communication.

Ability to work effectively in a multicultural environment.

Japanese conversational skills are a plus.

■ Good Reasons to Join

•Full remote everywhere in Japan.

• Super Flex Time (Core Time: 12:00pm ~ 3:00pm JST)
• In principle, 9:00am ~ 5:30pm (actual working hours: 7h30m + 1h break)

• Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days
Paid leave:
• Annual leave (up to 16 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire)

• Social Insurance (health insurance, employee pension, employment insurance and compensation insurance)
• 401K

■ Salary 

• Monthly salary
• Reviewed twice a year
• Bonuses paid twice a year (April and October) according to the company's performance and
the individual's evaluation
• Overtime allowance, Late overtime allowance, Commuting and transportation expenses

Do you want to join Top Fin-Tech company to start new career in Japan?

■ Job Title: Platfrom Engineer

■ Company Overview

Recently provide CashFlow Card, give users with more accessible and convenient fintech services that were previously not possible with credit cards and credit services by integrating with the CashFlow payment platform. We are looking for professionals who are passionate about refining our products at an overwhelming speed that no other company can match, and promoting the spread of cashless payments in Japan and the financial life platform that uses them. 

■ Your Role and Responsibilities 

Design and implement a resilient, scalable, and stable infrastructure platform

Develop infrastructure systems that support smooth patching and upgrade processes with minimal disruption

Architect infrastructure with high availability and fault tolerance at the AWS regional level

Collaborate closely with Security Engineers to build and maintain secure cloud environments

Automate AWS deployment processes to enable rapid and reliable delivery of cloud services for internal teams

Build self-service automation tools that empower developers to provision AWS resources independently and efficiently

Tech Stack
Cloud & Infrastructure Services:

AWS: VPC, EC2, ECS, EKS, Lambda, CloudFront, MWAA, RDS, ElastiCache, DynamoDB, OpenSearch, S3, CloudWatch, Cognito, SQS, KMS, Secrets Manager, MSK, CodeCommit, CodeBuild, CodeDeploy, CodePipeline, CloudFormation, and more

Infrastructure & DevOps Tools:

Terraform

GitHub Actions

Atlantis

ArgoCD

Monitoring & Observability:

Prometheus

Grafana

Dynatrace

OpenTelemetry

■ Experience and Qualifications

Over 5 years of hands-on experience in Cloud-based Infrastructure Platforms
Proven ability to take full ownership in managing Production environments
Strong knowledge of Cloud security best practices and regulatory compliance in the payments industry
Proficiency in designing, developing, and resolving issues in large-scale streaming and distributed systems using Kafka
Deep expertise in developing resilient platforms utilizing NoSQL/Key-Value Stores such as DynamoDB, Opensearch/Elasticsearch, and Redis
Solid experience in ensuring the availability, performance, and cost efficiency of Cloud infrastructure and platform systems
Broad practical experience with AWS Cloud services, including Compute, Storage, and Analytics
Proficient in Infrastructure-as-Code (IaC) tools on AWS, including Terraform, CloudFormation, and AWS CDK
Familiarity with Cloud monitoring, detection, and incident response solutions
Skilled in optimizing Cloud services for performance, managing costs, and implementing cost control measures
Experienced in managing updates and patching of Cloud infrastructure services

Python

Shell scripting

Go / Rust (optional)

Strong oral, written, and interpersonal communication abilities

■ Additional Preferred Qualifications

Bachelor’s degree or higher in a relevant technology field

Exposure to additional cloud platforms (e.g., Google Cloud Platform, Microsoft Azure)

Practical experience with Kubernetes; certifications such as CKA, CKAD, or CKS are a plus

Background in Event-Driven Architectures, especially Kafka

Familiarity with open-source tools and experience contributing to open-source projects

Understanding of IT compliance frameworks and security risk management

Publications (blogs, articles, or academic papers), certifications, or verifiable technical credentials

Bilingual proficiency in English and Japanese is a plus but not mandatory; fluency in either is sufficient

■ Good Reasons to Join

•Full remote everywhere in Japan.

• Super Flex Time (Core Time: 12:00pm ~ 3:00pm JST)
• In principle, 9:00am ~ 5:30pm (actual working hours: 7h30m + 1h break)

• Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days
Paid leave:
• Annual leave (up to 16 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire)

• Social Insurance (health insurance, employee pension, employment insurance and compensation insurance)
• 401K

■ Salary 

• Monthly salary
• Reviewed twice a year
• Bonuses paid twice a year (April and October) according to the company's performance and
the individual's evaluation
• Overtime allowance, Late overtime allowance, Commuting and transportation expenses, Work
style support allowance