Senior Frontend Developer – React

We're currently looking for a Senior Front end developer (React) to join our fast-paced growing team. As part of the engineering team, you will be responsible for building cloud-security solutions used by thousands of enterprise companies. Our flagship product, HENNGE One, provides functionalities ranging from access control, email filtering, online storage, and email archiving. We focus on implementing state-of-the-art security functionalities, ensuring SLA 99.9% in distributed fault-tolerant deployment, and providing the best user experience to our customers. Responsibilities Design, develop, and maintain innovative features based on business needs Bring our design system to life by implementing high-fidelity UI using a modern frontend framework Ensure high-quality deliverables through CI/CD pipelines, tests, and documentation Collaborate with Design, Product Management and Customer Success teams to continuously improve the product Support the team by actively participating in discussions and reviewing others' code Improve team synergy and mentor junior engineers Our Tech Stack Each product team is free to choose their own tech stack. Each project uses Typescript as the base language, with a combination of these technologies: React: Styled Components Redux (Toolkit) RxJS Jest/Testing Library Testcafe For more information, you can also check our Stackshare page out. Requirements Minimum Qualifications 3+ years of web development experience, with at least 3+ years in React. Ability to write proper type-safe code with Typescript Ability to mentor junior engineers and work collaboratively in a team environment Ability to write robust tests along with your code Understand the importance of clean code and software documentation Business-level English (Japanese is NOT required) Interested in open source/tech community activities Nice to have Degree in Computer Science or other related technical fields Experience with state management in a complex web app (e.g. Redux, Vuex) Familiarity with design collaboration tools like Figma Knowledge setting up build and test environments, CI/CD pipelines Knowledge of Unix-like environment Team leadership experience React: experience with Hooks, css-in-js libraries

HENNGE is a B2B SaaS company based in Tokyo Japan, and we are at the forefront of the changing workplace. HENNGE One, one of the top cloud security services in Japan, allows customers to adopt flexible work environments and safely harness the power of the cloud from any location. With cloud security ensured, employees are free to focus on working smarter, improving quality, and achieving business results.