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- Backend Engineer / LINE Platform
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
- Messaging
- 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.
Salary
Expected annual salary: JPY 6,000,000 to JPY 18,000,000
Form of salary: Monthly salary (including fixed overtime allowance)
Standard monthly salary: JPY 400,000 to JPY 1,200,000
(Breakdown of standard salary)
―Base salary: JPY 309,000 to JPY 934,000
―Fixed overtime allowance: JPY 90,000 to JPY 267,000
Fixed overtime allowance of 35 hours will be provided, regardless of whether overtime work is performed.
Note 1: Overtime allowance is paid separately for overtime work in excess of the fixed 35 hours.
Note 2: Names of items related to monthly salary vary depending on the grades.
Bonuses are granted a maximum of two times a year. The amount is determined by factors including the company's and your department's performance.
Type and Period of Employment
Type of employment: permanent employee
Note: No fixed period of employment
Selection Process
-
Step1
Application
-
Step2
Coding test/Assignment
-
Step3
Interviews/ Background Check
-
Step4
Offer
We have designed our selection process with an emphasis on technical aptitude and shared values.
Through this process, we aim not only to assess technical skills but also to deepen mutual understanding with the team.
Hard Skills Evaluation
- Pre-interview Web Coding Test (up to 3 hours)
- Live Coding interview
- Whiteboard Discussion interview
Soft Skills Evaluation & Cultural Fit
- Interviews with team members, discussions based on the resume
How to Apply
Please fill out and submit the application form.
Document Screening
You will be notified of the results of the selection process within two weeks at the e-mail address you entered in the application form, regardless of whether your application is accepted or not. It may take about one week longer if the application period falls during the Golden Week and the New Year holidays.
Interview, aptitude test, technical test, compliance check/reference check
Applicants who pass the document screening will be required to undergo multiple interviews, aptitude/technical tests, compliance checks, and reference checks, although the details vary depending on the position.
You will be notified of the results of the selection process within two weeks at the e-mail address you entered in the application form, regardless of whether your application is accepted or not.
The schedule will vary depending on interviews and other factors, but if everything goes smoothly, an internal offer will be made within about four to six weeks after the application is submitted. Please note that we will not respond to inquiries regarding the details or criteria of the selection process or the reasons for the results, regardless of the results of your application.
Other
To assess your eligibility for the position, we kindly ask you to provide the necessary personal information on the application form. Please note that this information will only be used for recruitment purposes. Please also note that your resume or other submitted documents will not be returned.
Allowances
Overtime allowance, commuting allowance,*1 LY Corporation Working Style allowance,*2 etc.
*1 You will be paid for the number of days you actually came to the office. (Maximum of JPY150,000/month)
*2 Allowance to improve your remote work environment (JPY11,000/month)
Work Location
Japan (You can live anywhere as long as you reside in Japan.)
You may be required to report to your assigned office to work.
Head office: Chiyoda-ku, Tokyo, Japan
Offices: Tokyo (Kioicho)
The offices are wheelchair accessible.
Note on measures against passive smoking: In principle, no smoking indoors (smoking rooms are available).
Subject to change to an office as determined by the company.
Work Hours
Flextime system: standard work hours 7 hours 45 minutes (no core hours)
Start and end times are up to the individual. However, the company's standard working hours are from 9:30 a.m. to 6:15 p.m.
Note: Some departments may operate on the standard work hours (9:30 a.m. - 6:15 p.m.), while others may have a shift schedule.
Holidays and Leave
Days Off
Two days off per week (Saturdays and Sundays*1), national holidays, New Year's holiday (December 29 to January 4)
Leave
Paid leave, special paid leave (for condolence, maternity, sick childcare, nursing care, legally-designated communicable disease, etc.), Happy Friday*2, sabbatical leave
Other
Work styles for those engaged in childcare and nursing care
*1 May differ depending on department.
*2 When a public holiday falls on a Saturday, employees will be given the previous business day off.
Benefits
Optional Defined Contribution (DC) Pension Plan, Comprehensive Welfare Group Term Insurance, Group Long-term Disability, Employee Savings Program, Cumulative Stock Investment Program, subsidy for re-examination after regular basic/comprehensive health checkup, LY Corporation Working Style allowance, in-house massage room, club activities, subsidy for employee social events, and more
Notes
Work Location Notes
【Upon Hiring】
As stated in the job posting under "Work Location".
Note: There are times when you may be required to come to the office due to work-related instructions.
【Scope of Changes】
Any office as designated by the company.
Job Description Notes
【Upon Hiring】
As stated in the job posting under "Job Details".
【Scope of Changes】
Any tasks as designated by the company.