• Full-time

Publication date： 2026.11.08

Frontend Engineer / Mid-Level

  • System Engineers / Infrastructure Engineers / Web Engineers / Game Developers
  • Tokyo
  • Salary： JPY 6,500,000 - 8,000,000
フロントエンドエンジニア/ミドル層
職種Position System Engineers / Infrastructure Engineers / Web Engineers / Game Developers
会社概要Company profile The hiring company provides the "CAREECON Platform," a construction DX platform built on the vision "Updating the construction industry through technology." It consists of "CAREECON," a media platform connecting the construction industry, and "CAREECON Plus," an integrated business tool for the construction industry that covers everything from marketing and hiring management to construction management and business management.

With feature development focused on SMBs and DX consulting services that stay with customers from implementation through operation, the company has more than 5,000 contracted client companies.
仕事内容Job description We are developing SaaS and platforms for small and medium-sized construction companies.
We are digitizing a wide range of construction industry operations, including estimating, billing, construction management, recruitment, and matching, while also working to create new work experiences using AI.
What we entrust to frontend engineers is not simply implementing screens.
The role is to design and implement the experience that connects users, products, and AI, and to evolve it into a better work experience.
We currently mainly use modern technology stacks such as React, Next.js, and TypeScript, but what we value is not the technology itself, but creating experiences that are valuable to users.
Working together with product managers and designers, you will deeply understand users' challenges and shape optimal solutions from the perspectives of features, design, and technology.
* Design and development of web applications
* Frontend development centered on React / Next.js
* Planning and implementation of UI / UX improvements
* Implementation of user experiences using AI features and AI agents
* Building and operating a design system
* Performance improvement, quality improvement, and development of technical foundations
* Feature development in collaboration with product managers and designers
[Immediately after hiring] Duties as described in the job description
[Scope of change] Duties determined by the company

Frontend: TypeScript, Next.js / React (migration planned), Nuxt.js / Vue.js, Sass
Backend: Ruby, Ruby on Rails, RSpec
Database: MySQL, Redis
iOS / Android: Dart, Flutter
Infrastructure: Firebase, AWS, GCP
Development tools: GitHub, Docker, CircleCI
Task management / documentation: Slack, Notion, ZenHub
Analytics / error monitoring: Sentry, Redash
Design tools: Figma
※The technologies used differ by product.
※GitHub Copilot can be used!
[https://branu.jp/news/page/230518/](https://branu.jp/news/page/230518/)
応募資格Requirement * Web application development experience of 3 years or more

[Preferred requirements]
* Experience developing in-house products
* Development experience using TypeScript, Vue.js, and the like
* Experience involved in the UI/UX design process (experience collaborating with designers using Figma and similar tools)
* Experience in component design and state management optimization
* Understanding of and insight into backend (API) design
* Development experience with a focus on performance and accessibility
* Leadership and mentoring experience in development teams
* AI development experience
* Experience in the construction industry
* Someone who can advance development cooperatively as a member of the team
* Someone with a strong desire to grow, who wants to update themselves along with their technical skills
* Someone who wants to be involved in solving social issues as an engineer
* Someone who wants to improve the construction industry, "Japan's core industry," through technology
* Someone with an interest in the product who can make bottom-up proposals
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 Flextime (10:00-19:00)
想定年収Salary JPY 6,500,000 - 8,000,000
条件・待遇Condition Full two-day weekend system (Saturday and Sunday) / Public holidays / Summer leave (per company calendar) / Year-end and New Year holidays (per company calendar) / Paid leave (10 days after six months of employment) / Condolence and celebration leave / Maternity leave (2 days) / Marriage leave (5 consecutive days) / Pre- and postnatal leave / Childcare leave
[Salary]
Expected annual salary: 650万円〜800万円
Monthly salary: 550,000円～710,000円
Wage type: Monthly salary
Fixed overtime allowance: 142,642円～184,137円
※Determined taking into account experience, skills, and salary at previous employment
※Fixed overtime allowance covers 45 hours; overtime beyond this is paid separately
※Probationary period: 3 months (may vary depending on skills and experience) / No difference in salary or treatment during the probationary period
※Year-end bonus: per company regulations
Employment type: Full-time employee
[Work location]
Tokyo, Minato-ku, Roppongi 6-1-24, Lapiros Roppongi 4F
Tokyo, Minato-ku, Roppongi 6-7-6, Roppongi Annex 4F
[Working hours]
10:00～19:00
※Flextime system (core time 11:00～15:00)
※Remote work available 2 days per week
※The above working hours and system apply to the Development Department only
[Social insurance]
■Health insurance (関東ITソフトウェア健康保険組合), Employees' pension insurance, Employment insurance, Workers' accident compensation insurance
選考についてProcess 【STEP1】Document screening via application form
▼
【STEP2】Interview with department manager
▼
【STEP3】Web test (personality assessment) + interview with CPO
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【STEP4】Job offer
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