Software Engineer (Frontend/Vue) - HENNGE Email DLP

We are looking for a Software Engineer (Frontend/Vue) to lead the frontend development for HENNGE One, our flagship cloud-security suite serving over 2.8 million users globally. As a B2B SaaS leader in Japan, we provide mission-critical security solutions that empower enterprises to work safely from anywhere.

In this role, you will join the Email DLP (Data Loss Prevention) Team, responsible for the development of HENNGE One DLP Edition. You will be developing our frontend web applications and their supporting tooling and infrastructure. Your mission is to maintain a large enterprise codebase while taking ownership of end-to-end feature development lifecycles. To succeed in this role, you will need strong frontend engineering fundamentals, as well as a transparent communication style, a passion for knowledge sharing, and a genuine comfort with pair programming, co-authorship, and collective code ownership.

While this role primarily focuses on the DLP Edition, we value engineers who are flexible and open to new challenges, with opportunities to move between teams and products through two-way discussions that support your growth and the company’s goals.

Tech Stack: Typescript, Vue 3, Pinia, Vite, Vitest with Testing Library, Playwright, Zod

Responsibilities

• Develop and maintain innovative features for our email security platform for enterprises.
• Build performant, reactive UIs with centralized state management, a shared design system, and REST data layers.
• Ensure application robustness through testing with Vitest and Playwright, and strict type safety with TypeScript.
• Participate actively in code reviews and team discussions by sharing knowledge, asking clarifying questions, and collaborating openly.
• Collaborate closely with Design, Product Management, and Customer Success teams to deliver engaging user experiences, with a focus on accessibility and internationalization compliance.

Requirements

• 3+ years of experience working with Typescript in a production project in a full time position, and the ability to write Vue 3 + Composition API.
• Solid grasp of CS fundamentals, design patterns, and frontend-specific concepts like reactivity, state management, and network requests.
• Familiarity with standard engineering and frontend tooling (e.g., Git, Docker, browser dev tools, Typescript compiler, linters, formatters, bundlers, and dev servers).
• Ability to write high-quality type-safe, robustly tested Typescript, leveraging utility types and runtime schema validation.
• Ability to communicate effectively, share knowledge, and work collaboratively through pair programming, co-authorship, and collective code ownership.
• Understanding of how to use AI responsibly and pragmatically, without overreliance.
• Fluency in English (Japanese is not required), equivalent to CEFR B2 level or above (e.g., TOEIC 785+).

Nice to haves

While not specifically required, tell us if you have any of the following.

• Degree in Computer Science or other related technical fields.
• Proactive curiosity regarding modern frontend ecosystem tools and best practices.
• Interest in contributing to open-source projects or participating in the tech community.
• Familiarity with design collaboration tools like Figma.
• Experience in cloud computing platforms, especially AWS.
• Experience with building SaaS products.
• Knowledge of DevOps tools and practices (CI/CD, Infrastructure as Code).
• Knowledge of Linux / MacOS / Unix-like environments.