Backend Engineer / LINE Platform

Position Outline

Responsible for designing, developing, testing, and post-release operation

of messaging for the "LINE" app and Official Account backend system.

Job Details

You will be in charge of the backend for the "LINE" app, which processes

tens of billions of messages per day.

In addition to daily messaging between end users, many companies and

external organizations provide services on the LINE app, making it an

important infrastructure in our daily lives. As a result, expectations for safety

and reliability are increasing.

You will be responsible for the development and improvement of sustaining

and operating the platform that supports significant and vast traffic with

more efficient resources, and for developing and supporting the backend

that creates greater value for people within LINE Yahoo.

Mission/Goals

• Achieve reliability and information protection that serves as a societal

infrastructure while maintaining the speed of innovation.

• Realize expandability and scalability that meet the diverse needs

accompanying cultural and temporal changes in various countries.

• Combine a stable foundation with intelligent applications to achieve a

breakthrough in communication.

Responsibilities

• Design and development of server-side functions and APIs related to

LINE's messaging, social graph services, and family services.

• Design and development of data structures for large-scale data

storage, focusing on scale and distributed processing.

• Continuous improvement of the structure, performance, and

scalability of LINE's foundational platform and crafting a technical

vision for the system that can flexibly respond to diverse business

requirements.

Responsible Service

• LINE

o Messaging

o Social Graph and its related services

• LINE OA

• LYP Premium

Ideal Candidate

• Someone interested in the challenging problems of complex, large-

scale distributed systems and their solutions.

• Someone who takes initiative to solve problems, involves others, and

takes responsibility.

• Someone who can work cooperatively with members of diverse

backgrounds through positive communication.

• Someone who can learn new technologies, find realistic solutions

according to the team's situation and schedule, and execute tasks

efficiently

Required Experience/Skills

• Server-side development experience (JVM languages or C/C++) for 3

years or more.

• Experience in operating production systems in Linux/Unix

environments.

• Database operation experience (MySQL, Redis, HBase, Cassandra,

Elasticsearch, etc.).

Preferred Experience/Skills

• Experience in designing and developing server applications and

databases in high-traffic environments.

• Knowledge of JVM tuning and monitoring.

• Major in Computer Science or a related field in college or graduate

school.

• Business-level English (reading and writing).

• Speaking ability: Either Business English or Business Japanese. (at

least one)

Development Environment

• Product and Service Development: Java, Kotlin, Scala, Spring

Framework.

• Observability: Prometheus, Grafana, AlertManager, Elasticsearch,

Kibana, Zipkin.

• Storage (RDBMS, NoSQL, Event Store): Redis, Apache HBase,

Apache Kafka, MongoDB

• Infrastructure: Container (k8s), VM/PM on Private Cloud (Verda).

• Infrastructure as Code, CI/CD, Configuration repository: Ansible,

ArgoCD, Jenkins, GitHub Actions.

Backend Engineer / LINE Platform

Position Outline

Responsible for designing, developing, testing, and post-release operation

of messaging for the "LINE" app and Official Account backend system.

Job Details

You will be in charge of the backend for the "LINE" app, which processes

tens of billions of messages per day.

In addition to daily messaging between end users, many companies and

external organizations provide services on the LINE app, making it an

important infrastructure in our daily lives. As a result, expectations for safety

and reliability are increasing.

You will be responsible for the development and improvement of sustaining

and operating the platform that supports significant and vast traffic with

more efficient resources, and for developing and supporting the backend

that creates greater value for people within LINE Yahoo.

Mission/Goals

• Achieve reliability and information protection that serves as a societal

infrastructure while maintaining the speed of innovation.

• Realize expandability and scalability that meet the diverse needs

accompanying cultural and temporal changes in various countries.

• Combine a stable foundation with intelligent applications to achieve a

breakthrough in communication.

Responsibilities

• Design and development of server-side functions and APIs related to

LINE's messaging, social graph services, and family services.

• Design and development of data structures for large-scale data

storage, focusing on scale and distributed processing.

• Continuous improvement of the structure, performance, and

scalability of LINE's foundational platform and crafting a technical

vision for the system that can flexibly respond to diverse business

requirements.

Responsible Service

• LINE

o Messaging

o Social Graph and its related services

• LINE OA

• LYP Premium

Ideal Candidate

• Someone interested in the challenging problems of complex, large-

scale distributed systems and their solutions.

• Someone who takes initiative to solve problems, involves others, and

takes responsibility.

• Someone who can work cooperatively with members of diverse

backgrounds through positive communication.

• Someone who can learn new technologies, find realistic solutions

according to the team's situation and schedule, and execute tasks

efficiently

Required Experience/Skills

• Server-side development experience (JVM languages or C/C++) for 3

years or more.

• Experience in operating production systems in Linux/Unix

environments.

• Database operation experience (MySQL, Redis, HBase, Cassandra,

Elasticsearch, etc.).

Preferred Experience/Skills

• Experience in designing and developing server applications and

databases in high-traffic environments.

• Knowledge of JVM tuning and monitoring.

• Major in Computer Science or a related field in college or graduate

school.

• Business-level English (reading and writing).

• Speaking ability: Either Business English or Business Japanese. (at

least one)

Development Environment

• Product and Service Development: Java, Kotlin, Scala, Spring

Framework.

• Observability: Prometheus, Grafana, AlertManager, Elasticsearch,

Kibana, Zipkin.

• Storage (RDBMS, NoSQL, Event Store): Redis, Apache HBase,

Apache Kafka, MongoDB

• Infrastructure: Container (k8s), VM/PM on Private Cloud (Verda).

• Infrastructure as Code, CI/CD, Configuration repository: Ansible,

ArgoCD, Jenkins, GitHub Actions.

Senior Software Engineer - Ad Product Section, Global Ad Technology Supervisory Department (GATD)

Job Description: Business Overview Rakuten is one of the leading e-commerce companies in the world. Our mission is to empower people and society through the internet while aiming at becoming the Global Innovation Company. Department Overview The advertising business is one of four focus areas of Rakuten. Our mission is to increase profit for all Rakuten, by providing high quality marketing services, as a CoE of Ad technology and Ad platform provider. We are always developing and enhancing comprehensive ad platforms, which enables our clients to fully utilize Rakuten's assets as much as possible. We have a highly motivated, skilled, talented, and approachable team distributed across Tokyo, Singapore, India, and China. Position: Why We Hire We are seeking a highly skilled and dynamic full-stack engineer with extensive technical expertise and proven team leadership experience to take ownership of technical responsibilities throughout the entire product development lifecycle. The ideal candidate will excel at solving diverse technical and business challenges while providing mentorship and guidance to other engineers on the team. This role provides an exciting opportunity to advance your tech career by contributing to the development of multiple products within Rakuten's extensive ecosystem and cutting-edge technology landscape. Position Details Project Execution - Gather and analyze requirements to ensure a clear understanding of project needs - Translate business requirements into detailed technical specifications - Design and implement scalable and efficient features - Perform unit testing, verification, and validation to ensure robust functionality - Conduct thorough code reviews to maintain high code quality and adherence to standards - Manage deployment and rollback operations across DEV, STG, and PROD environments - Monitor systems post-release, perform regular maintenance, and address any issues proactively Collaboration - Work closely with engineers, product managers, project managers, and cross-functional business teams to design and develop exceptional features - Collaborate with a separate QA team and DevOps team - Collaborate with cross-culture, cross-border development team during the project execution Always Improve, Always Advance - Develop a deep understanding of the entire product and system to identify and recommend technical enhancements

- Anticipate future business and product requirements, proactively suggesting system improvements to stay ahead of evolving needs - Stay ahead of the curve by exploring emerging technologies, evaluating their potential, and creating roadmaps to integrate them effectively Mentoring - Mentor junior developers, freshers, and interns, providing guidance and support to help them excel - Identify key areas for their growth and actively work towards fostering their technical development and career progression Mandatory Qualifications: - A minimum of 7+ years of proven, hands-on experience as a Software Engineer in software development, demonstrating strong analytical and problem-solving skills - Extensive hands-on experience in designing and developing large-scale web applications using technologies such as Java, Spring, MariaDB, MongoDB, Kafka, and React.js - Comprehensive, hands-on experience with Agile development methodologies and Scrum practices - Proactive, self-driven, and highly motivated individual - Excellent communication skills, capable of effectively collaborating with both technical and non-technical stakeholders - A team player with a positive and approachable attitude - Strong "get-things-done" mindset paired with a sense of ownership and accountability Technical - Java spring (boot+batch) - HTML, CSS, JavaScript - MySQL/MariaDB - NoSQL (MongoDB) - Big Data (Hadoop, Hive, Spark) - Version Control - Git - Jira or similar project and task management tool Desired Qualifications: - React, Angular - NoSQL (Couchbase, Cassandra, Redis) - Big Data (Tez, Presto) - Test Automation - JUnit - Code Quality - Sonar - Streaming platform - Kafka, RabitMQ - CI/CD - Jenkins - BI Tool - MicroStrategy, Tableau - Experience with enterprise system architecture design such as data pipeline design - Domain knowledge of advertisement system architecture and KPIs Languages: English (Overall - 3 - Advanced)