• Full-time

Publication date: 2025.06.02

Company name not disclosed

Software Engineer(Backend) (13377)

  • System Engineers / Infrastructure Engineers / Web Engineers / Game Developers
  • Tokyo
  • Salary ¥5M-7.5M
ソフトウェアエンジニア(バックエンド) (13377)
職種Position System Engineers / Infrastructure Engineers / Web Engineers / Game Developers
会社概要Company profile [Company Overview]
A corporate venture originated from ITOCHU Corporation, offering services such as used smartphone purchasing, sales, and rentals.
We operate "NicoSma" and "Belong Purchase" for individuals, and provide several B2B solutions including:

Belong One Rental Plan

Belong One Sales Plan

Belong Purchase for Biz

[Attractive Points of the Company / Role]
Contribute to a mission: "Deliver value you can be proud of to the people who matter most."

Be part of a socially impactful business that promotes reuse of smartphones and other devices.

Work in an environment that allows for flexible and adaptive development tailored to diverse user needs.

Opportunity to enhance your skills using modern technologies such as APIs and web services.

Enjoy flexible working hours (flextime system) that support various lifestyles.

Comprehensive benefits, including health checkups, transportation allowance, and employee discounts.

Collaborate with your team to tackle complex challenges thoughtfully.

A challenging role where you can create and deliver new value to the market.
仕事内容Job description *This position is available only for people residing in Japan
A mission-driven team is building an ecosystem for used smart devices under the guiding principle: "Deliver the next value you can be proud to share with those who matter most." They provide services to a wide range of stakeholders—including individual customers, corporate clients, and internal users—each with their own distinct challenges and needs. With fully in-house development, they are able to respond flexibly and effectively to these challenges. They are currently seeking engineers capable of building scalable, highly available, and robust systems such as web services, APIs, and data analytics infrastructure.

【Overview】 - Development of APIs for internal and external use (Go/Python) - Web frontend development (Next.js & TypeScript) - Building integrated data analytics platforms (BigQuery) - Integration with internal and external systems via HTTP and gRPC - Designing and maintaining databases using CloudSQL - Releasing, maintaining, and monitoring systems, including incident response and on-call rotations - Team building and sharing engineering best practices - Working with executives and product owners to gather, document, and implement requirements

【Examples of Responsibilities】 - Development and maintenance of customer-facing platforms, including a device trade-in and resale service - Development and operation of inventory and sales management systems for internal operations - Launch of B2B SaaS systems - Construction of a data warehouse (DWH) - Development and management of master data systems

Scope of work is subject to change depending on company requirements.
応募資格Requirement 【Must-Have Skills】 Japanese language skills at JLPT N1 level. Degree in Computer Science, Information Engineering, or similar practical experience. At least 2 years experience developing and running web apps. Experience making tech decisions and designing overall service architecture. Experience designing and managing relational database (RDB) tables. Experience working with serverless products on public clouds like GCP or AWS. Basic knowledge of container tech, databases, and info security.

【Nice-to-Have Skills】 Frontend development experience with React and TypeScript. Experience connecting app data with a data warehouse (DWH). Led design and operation of entire services and managed projects as a team leader. Built apps using no-code tools like Bubble. Experience with multi-tenant SaaS and auth/authz systems. Built API systems using gRPC and Protocol Buffers. Good at breaking down complex or unclear info into clear issues and actions. Experience as a tech lead or helped start a tech team. Proactively suggest and develop features with user experience in mind. Able to explain tech stuff clearly and logically to non-tech people and collaborate with various stakeholders. Business-level English for smooth remote meetings.
日本語力Japanese level Fluent
雇用形態Employment type Full-time
勤務エリアLocation Tokyo
勤務時間Working hours Flexible working hours with core time from 11:00 A
想定年収Salary ¥5M-7.5M
条件・待遇Condition Employment Type: Full time
Trial period: months:3months
Estimated annual income: 7M-12M Yen
Work location: Tokyo
Working hours:Flexible working hours (core time: 11:00 AM – 3:00 PM)
Holidays: 2 days a week (Saturdays and Sundays), national holidays
Vacation: Summer vacation, year-end and New Year holidays, and other vacations available
Overtime: Average month
Benefits: Comprehensive social insurance, commuting allowance (according to company policy), condolence leave, maternity and childcare leave, parental leave, Sick Leave (10 days per year granted separately from paid leave for personal illness or injury), Family Emergency Leave (10 days per year granted separately from paid leave, usable for family emergencies, childcare, or caregiving).
Remote work is available, with on-site attendance recommended 2–3 times per week.
選考についてProcess
Comments from United World
TOP