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About the Role

We are seeking a Senior Frontend Engineer to lead the frontend development of Tadrill, a platform focused on building organizational resilience against cyber threats. This role involves architecting a scalable framework to translate complex security data into actionable insights through intuitive dashboards, acting as both a technical owner and a team catalyst. Opportunities exist to contribute to other teams and products within the company.

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

At least 3 years of experience working with Typescript in a production project in a full time position.
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, equivalent to CEFR B2 level or above (e.g., TOEIC 785+).

Skills

Typescript
Vue 3
Pinia
Vite
Vitest with Testing Library
Playwright
Zod
Git
Docker
Browser dev tools
Linters
Formatters
Bundlers
Dev servers
Utility types
Runtime schema validation
Pair programming
Co-authorship
Collective code ownership
Figma
AWS
CI/CD
Infrastructure as Code
Linux
MacOS
Unix-like environments

Location

Tokyo, Japan

Work Type

Permanent employee
Flexible working hours

Experience Level

Senior

Education Level

Degree in Computer Science or a related technical field (preferred)

Salary/Compensations

8 to 10.5 million JPY

Benefits

English Allowance and Advanced Language Expert Allowance
Physical Communication Bonus
Transportation allowance
Employee Stock Ownership Plan
Insurance: Health, Employment, Industrial Injury, Welfare pension
Opportunities to attend international and domestic conferences
Financial support for technical certifications and technical learning programs
Flight tickets for relocation
Visa sponsorship
Japanese lessons

About the Company

HENNGE is a Tokyo-based cloud-security leader focused on enabling flexible work environments and secure cloud adoption.
We are a B2B SaaS company developing secure and reliable cloud solutions for enterprise access and identity management.
Our flagship product, HENNGE One, provides access control, email filtering, archiving, and advanced cloud security features to thousands of enterprise customers.
We are characterized by a highly technical CEO, a strong engineering culture, and a global perspective.

Equal Opportunity

We celebrate diversity with a vibrant team from over 20 countries.
We provide smooth relocation support for international hires.
Work-life balance is highly valued, with flexible working hours and numerous social activities.
We foster a culture passionate about technology, with a CEO deeply engaged in product development.
We operate with collaborative and autonomous teams where decisions shape our services.