Job Title
: Application Engineer (SMS Business Division)

Location
: Tokyo (Hybrid remote work)

Employment Type:
Full-time (Regular Employment)

Starting Salary Range:
~ 0 JPY

Japanese Level:
Advanced Level

Open for applicants who is currently residing in Japan with valid working visa for non-Japanese citizen

About the Company

The company is a major domestic telecom and advertising group company, part of a large corporate network with over 200 engineers and data scientists. Operating as a "hybrid startup," we combine the stability and resources of a major enterprise with the speed, innovation, and agility of a startup.

Core Business Areas:

• Marketing Solutions: Advanced carrier data and high-precision ad delivery technologies to drive client growth.
• Data Solutions: Data-driven strategies to enhance customer experience (CX) and create new revenue opportunities.
• Other Services: OMO (Online-Merge-Offline), messaging solutions, and data consulting.

Organizational Highlights & Strengths:

• Strong ties with global companies through M&A and strategic alliances.
• Industry-leading ad technology and extensive first-party data assets.
• Diversified business portfolio: advertising, search, OMO, consulting, and more.
• Flexibility to launch new ventures and expand internationally leveraging group networks.

Why Engineers Love Working Here:

• Work with a diverse, international team including former CTOs and published researchers.
• Opportunities to work across frontend, backend, infrastructure, ML, and other technical areas.
• Young engineers gain real responsibility and chances to lead projects.
• Flat organizational structure encourages open communication across teams and nationalities.

Culture & Work Style:

• Flexible work arrangements: remote work, flex-time, casual dress code.
• Unique policies like "Monday morning off" and substitute holidays.
• Paid leave and half-days are easy to take; low overtime culture.
• Supports personal and professional growth, prioritizing what employees want to do.

The company is rapidly expanding, leveraging data and technology while maintaining startup agility. This is an ideal environment for engineers seeking broad autonomy, global exposure, and opportunities for impactful career growth.

Job Description

The company aims to become a global technology enterprise that co-creates new value. It is a hybrid startup that blends the rich assets of large corporations with the speed and challenging mindset of startups.

The business is primarily developed around two key areas:

• Marketing Technology Business, which supports corporate digital marketing using career data and advanced advertising delivery technology.
• Data Enabler Business, which maximizes the value of customer touchpoints and data for companies by utilizing data and its application technologies.

Currently, the company is seeking new members to join the development, operation, and improvement of the messaging platform "KDDI MessageCast," a collaborative project with a major telecommunications provider.

This service, which delivers SMS and RCS to mobile devices, is a proprietary product. Though relatively new, having been developed over the past four years, it is a growing and focused business with steadily increasing adoption by companies.

Responsibilities

The role involves the development of applications for corporate mobile messaging platforms. The responsibilities span from requirement definition to design and implementation.

Key responsibilities include:

• Designing and selecting technologies based on large-scale functional requirements
• Frontend implementation using React and TypeScript
• Development and modification of server-side APIs, as well as handling inquiries
• Collaboration with the design team for implementation coordination
• Performance tuning and devising/executing measures for quality improvement

Development Environment & Technology Stack:

Frontend:

* TypeScript / React

Backend:

* Go / Echo / GraphQL

Infrastructure:

* AWS (including various managed services such as Fargate)

*The company respects the engineers' discretion in technology selection during development, and they encourage engagement with technologies that team members wish to learn or challenge themselves with.*

Requirements

Must

• Experience in development using GitHub
• Experience implementing SPAs using React, Vue, or similar frameworks
• Interest in server-side development
• Practical experience in frontend implementation with a focus on security considerations

Japanese Level

★★★☆☆ Advanced

Better

• Experience in infrastructure setup within an AWS cloud environment
• Practical experience in server-side development using Web APIs (REST/GraphQL, etc.)
• Practical experience in developing Web APIs (REST/GraphQL, etc.) using Go
• Experience contributing to open-source software (OSS)