Web Application Engineer

Job Description As a Web Application Engineer, you will handle a wide range of responsibilities. With a full-stack orientation, you will be involved in the entire process from planning to development and operations, offering high autonomy and opportunities to expand your skill set. Additionally, you will have the chance to contribute across five distinct products, enabling you to build a versatile, well-rounded engineering background. ■Responsibilites ・API and client application development for visitor management systems, scheduling services, and meeting room management systems ・Feature enhancements, improvements, maintenance, testing, and bug fixes ・Formulation of technical specifications and documentation related to the above ★ Work collaboratively across teams—including Development, QA, Sales, and Marketing—communicating primarily via business chat tools. ■Development Environment Utilizes highly in-demand, modern technologies to align with current industry standards. Ruby on Rails Nodejs React React Native Docker AWS GCP ■Position Highlights ・Scale & Impact: Opportunity to work on one of Japan's leading large-scale B2B SaaS platforms. Since its 2017 launch, the cloud visitor management system has earned top-tier market share, serving approximately 5 million users annually. ・High-Quality Service: Manage a highly regarded SaaS product with an exceptional retention rate of over 99.5% (FY2025 actual). ・In-House Development: Direct feedback from clients and internal team members directly shares product enhancements, allowing you to transform real user requirements into features. ・Autonomy & Skill Growth: High level of discretion in your work—strengthen your problem-solving and proposal skills by proactively identifying issues and driving solutions. ・Flexible Workstyle: Highly efficient work environment featuring flexible hours (flex-time) and remote work options. Working Hours Flextime System Job Requirements 【Required】 ・Skills in implementing both front-end and back-end systems, along with the technical expertise and design skills to independently complete the implementation of major features ・Experience using Docker ・Knowledge of AWS And one of the following: ・5+ years of experience using React, as well as experience using frameworks similar to Ruby on Rails (such as Django or Laravel) ・5+ years of experience with Ruby on Rails, as well as experience with libraries or frameworks similar to React (such as Angular or Vue.js) 【Preferred】 ・Experience developing in-house SaaS products ・Experience developing with React Native ・Experience using Jira and Notion 【Ideal Applicants】 ・Passionate about writing code not just for the sake of building, but to drive adoption and generate true business value. ・Motivated to work on products you genuinely love and believe have strong growth potential. ・Highly self-driven and ambitious, with a proactive desire to share knowledge and insights with the team. ・Genuine interest in our products and overall mission. ・Skilled at or genuinely enjoys interpersonal communication and cross-functional collaboration. Japanese Level Business Level(JLPT Level 2 or N2) Salary JPY - Japanese Yen JPY 5500K - JPY 8000K 【Welfare】 ・Full social insurance ・Commuting allowance ・Flu shot subsidy ・Water dispenser ・Free drinks ・Team-building lunches ・Discount coupons for babysitting services ・Side jobs permitted ・Support program for obtaining professional certifications Holidays ■2 days off per week (Sat. and Sun.) ■National Holidays ■Year-end and New Year Holiday Job Contract Period fulltime