Server-Side Engineer

★Server side Engineer / Major ebook app Japanese: Business Level REQUIRED ★Major IT company: In-house Development ★Flextime System & Hybrid Work ★Annual salary: 7.5 million yen - 11 million yen ★Global Business & International Environment -------------【About the company】------------- The company is developing an e-comics service for smartphones that allows users to easily enjoy manga works via an app. This service is expanding in the Japanese market as a member of "WEBTOON worldwide service," an alliance of platform services that boasts the overwhelming world's largest scale in this market, with 82 million global monthly users, over 200 million cumulative downloads, and a monthly circulation of over 10 billion yen. The company's service has grown steadily since its release in 2013. ＜Most recent results＞ ・2021 Domestic App Spending Ranking #2 (as of January 2022/Exhibit: App Annie) ・Non-Game No. 9 in global mobile app revenue ranking (as of June 2021/exhibit: Sensortower) ・No. 1 in Google Play free popular apps ranking (as of December 6, 2021/Exhibit:Google Play) -------------【 Job Description】------------- You will be responsible for the backend system development and maintenance of the company's proprietary e-book distribution service. This is a 100% in-house development environment, ensuring that all engineering efforts are dedicated to the company's own services. The scope of the role is broad and highly collaborative, covering the entire lifecycle from issue discovery, proposal, and specification planning to requirements definition, design, development, release, and operations. Depending on your career goals and aspirations, you will have the opportunity to be deeply involved in the strategic planning phases of the product. ■Responsibilities ・Feature Development & API Design: Lead the development of new functionalities and the design of server-side APIs for the e-book platform. ・Collaborative Specification Planning: Work closely with the product planning and frontend teams to define and refine technical specifications. ・System Stability & Technical Debt Management: Ensure high system availability and proactively engage in continuous refactoring to maintain long-term code health. ・Quality Assurance through Code Reviews: Maintain high engineering standards and foster knowledge sharing across the team through rigorous code reviews. ・Database Engineering: Responsible for DB design and performance tuning to support the platform’s data-intensive operations. ■Development Environment (Languages, Architectures, Development Methods, Tools Used, etc.) ・Languages: Java, Kotlin, PHP, Python ・Frameworks: Spring Boot, Symfony ・Databases: MySQL/Aurora, Redis, Cassandra ・Infrastructure: AWS, Akamai, Private Cloud ・CI/CD: CodePipeline, GitHub Actions ・Development Devices: Specifications confirmed before joining; provided based on company policy. External monitors and testing devices available. -------------【 Requirements】------------- 【Required】 ・3+ years of server-side development experience ・Development experience with Java, Kotlin, or PHP ・Design and operational experience with RDBMS (e.g., MySQL) ・Web API design and development experience ・Team development experience using Git/GitHub 【Preferred】 ・Experience developing and operating large-scale web services (B2C) ・High-traffic countermeasures and performance tuning ・Experience with cloud infrastructure (AWS/GCP, etc.) ・Experience using container technologies (Docker/K8s) ・Experience designing microservices/architecture ・Leadership experience 【Ideal Applicants】 ・Emphasizes teamwork and excels in communication ・Consistently prioritizes the user first ・Demonstrates a strong drive for technical improvement and pursues quality ・Possesses a business mindset and contributes to growth -------------------------------------------------- 【Working Time 】 Flextime System (*Core-time 11:00～16:00) 【 Welfare 】 ・Full Social Insurance ・Commuting Allowance ・Medical checkups ・Various in-house events, etc. ■Measures to prevent passive smoking ・In principle, no smoking indoors (smoking rooms are available indoors) ・Yotsuya Office, Minami Shinjuku Office, Osaki Office ・Salary revision: Twice a year ・Allowance: Transportation expenses (in accordance with company regulations), LINE Pay Card Benefit Plan(*2) (*1) In addition to the annual salary amount, incentives may be paid twice a year depending on the company's and the individual's performance and evaluation. (This is not always paid. Only employees who are enrolled at the company on the date of payment are eligible for the payment). (*2) This allowance is paid separately from salary for the purpose of "health maintenance and improvement," "self-development," and "next-generation development" of employees. 【 Holiday 】 2 days a week (Saturday and Sunday)Annual Paid LeaveNational HolidaysNew Year holiday, etc-------------------------------------------------------------------------