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About the Role

We are seeking a Senior Frontend Engineer to lead the frontend development of Tadrill, a platform designed to build organizational resilience by equipping employees to identify and neutralize cyberthreats. As a core component of HENNGE One Cybersecurity Edition, Tadrill transforms employee behavior through continuous attack simulations, e-learning, and reporting flows. In this role, you will architect a high-scale framework, turning complex security data into actionable insights through intuitive dashboards, serving as both a technical owner and a catalyst for team engagement. Opportunities exist to move between teams and products to support your growth and the company’s goals.

Responsibilities

Design, build, and ship new frontend features for the Tadrill platform, ensuring a high-quality user experience.
Monitor, test, and improve the existing codebase to maintain speed and stability as the product scales.
Collaborate closely with Backend Engineers, Designers, and Product Managers to turn requirements into practical, high-quality code.
Identify areas for optimization across the entire application lifecycle to improve development efficiency and end-to-end performance.
Participate actively in code reviews, technical discussions, and documentation to ensure long-term maintainability.
Mentor junior engineers and contribute to a communicative, connected, and curious team environment.

Requirements

3+ years of professional experience in frontend development with a strong focus on modern frontend frameworks (Svelte, React, Vue, Solid, Angular etc.).
Either have used Svelte professionally, in personal projects or have strong interest in working with it.
Proven track record of maintaining and scaling B2B SaaS products where stability and user-trust are paramount.
Experience leading technical initiatives or mentoring engineers in a collaborative, cross-functional environment.
High learning agility: the ability to dive into a specialized domain (Cybersecurity) and master a new stack with speed and curiosity.
A proactive "owner" mindset: you drive the success of a feature from conception to deployment.
Fluency in English (Japanese is not required), equivalent to CEFR B2 level or above (e.g., TOEIC 785+); an interest in working within a multicultural environment is essential.
Interest in contributing to open-source projects or participating in the tech community.
Degree in Computer Science or related technical field.
Experience with Go or other backend languages.
Hands-on experience with cloud infrastructure (AWS, GCP, or Azure) and distributed system concepts.
Knowledge in Cybersecurity (email security/phishing simulations), especially in the security awareness training domain.
Experience with Google Workspace or Microsoft 365 integrations, particularly in developing Gmail add-ons and Outlook add-ins.
Experience in technical project leadership (Team Lead equivalent) or people management (Engineering Manager equivalent).

Skills

Svelte
SvelteKit
Typescript
Playwright
Chromatic
Sentry
Go
AWS
Frontend development
Modern frontend frameworks
B2B SaaS products
Cybersecurity
Google Workspace
Microsoft 365
Gmail add-ons
Outlook add-ins

Location

Tokyo, Japan — Shibuya Headquarters

Work Type

Permanent employee
Flexible working hours

Experience Level

Senior
3+ years of professional experience in frontend development

Education Level

Degree in Computer Science or related technical field

Salary/Compensations

8.5 to 12.5 million JPY

Benefits

English Allowance and Advanced Language Expert Allowance: JPY 10,000 ~ JPY 130,000 per month
Physical Communication Bonus: JPY 4,000 per day for coming to the office
Transportation allowance (maximum of JPY 35,000 per month)
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

About the Company

HENNGE is a Tokyo-based cloud-security leader helping organizations adopt flexible work environments and safely leverage the cloud.
As a B2B SaaS company, we build secure and reliable cloud solutions that help enterprises manage access and identity efficiently.
Our flagship product, HENNGE One, empowers thousands of enterprise customers with access control, email filtering, archiving, and next-gen cloud security features.
We have a highly technical CEO, strong engineering culture, and a global mindset.
Join a vibrant team from over 20 countries, united by a love for technology and Japanese culture.
We offer a dynamic, non-traditional work environment in one of the world's most exciting cities.
We make your move to Japan smooth and stress-free, providing comprehensive support such as flight tickets, visa sponsorship, and Japanese lessons.
Work-life balance is highly valued at HENNGE.
Our CEO has an engineering background and remains deeply engaged in product development, fostering a culture where thoughtful design, technical quality, and continuous improvement are genuinely valued.
Work in autonomous teams where your decisions shape our services.
Influence every aspect of our products, from UX and architecture to development and deployment, in an agile and collaborative setting.