Senior Frontend Engineer (Svelte) — Tokyo, Japan

Role Overview

Join as a Senior Frontend Engineer leading the development of Tadrill, a platform empowering organizations and employees to defend against modern cyberthreats—especially phishing attacks. Tadrill is a crucial component of a leading cybersecurity suite, used by over 2.8 million users globally. You’ll architect highly scalable, intuitive dashboards, turning complex security data into actionable insights, while driving both technical ownership and team engagement.

Opportunities abound to work across teams and products, leveraging a culture that encourages growth and innovation.

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Tech Stack

• Frontend: Svelte w/ SvelteKit, Typescript
• Testing/Monitoring: Playwright, Chromatic, Sentry
• Backend: Go
• Infrastructure: AWS

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What You’ll Do

• Design, build, and ship new frontend features for the Tadrill platform to deliver high-quality user experiences.
• Monitor, test, and improve the existing codebase to ensure scalability, speed, and product stability.
• Collaborate closely with Backend Engineers, Designers, and Product Managers to translate requirements into production-ready features.
• Identify and execute on opportunities to optimize performance and development processes.
• Participate in code reviews, technical discussions, and maintain documentation for long-term maintainability.
• Mentor junior engineers, fostering a culture of communication and curiosity.

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What We’re Looking For

Minimum Qualifications

• 3+ years of professional frontend development (with modern frameworks such as Svelte, React, Vue, Solid, Angular, etc.)
• Svelte experience: Used Svelte professionally, in personal projects, or possess a strong interest in working with it
• B2B SaaS experience: Proven track record maintaining and scaling products where stability and user trust are critical
• Technical leadership/mentoring experience in collaborative and cross-functional teams
• High learning agility: Ability to quickly master new technical domains and stacks (e.g., cybersecurity)
• Owner mindset: Ability to take responsibility for features from conception to deployment
• English fluency: CEFR B2 or above (e.g., TOEIC 785+); Japanese is not required.
• Cultural curiosity: Interest in international/multicultural working environments
• Community involvement: Interest in contributing to open-source or the tech community

Nice-to-Have

• Computer Science or related technical degree
• Experience with Go or other backend languages
• Experience with cloud infrastructure (AWS, GCP, Azure) and distributed systems
• Understanding of cybersecurity concepts (email security, phishing simulations), especially in security awareness training
• Experience with Google Workspace/Microsoft 365 integrations (e.g., Gmail add-ons, Outlook add-ins)
• Technical project leadership or people management experience

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Work Style & Employment Details

• Work Style: Flexible hours with core time (11:00–16:00). Typical workday is 8 hours with a one-hour break.
• Employment Type: Permanent
• Location: Shibuya, Tokyo, Japan Headquarters

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Compensation & Benefits

• Annual Salary: 8.5M–12.5M JPY (includes English Allowance and Physical Communication Bonus)
• English/Language Allowance: 10,000–130,000 JPY/month (if requirements met)
• Physical Communication Bonus: 4,000 JPY/day (for days at the office)
• Transportation: Up to 35,000 JPY/month
• Stock Ownership Plan
• Insurance: Health, Employment, Industrial Injury, Welfare pension
• Conference & Learning Support: Attend international/domestic conferences, and financial support for technical certifications and learning programs

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Why You’ll Enjoy Working Here

• 🌎 Celebrate Diversity: Team of 20+ nationalities, passionate about technology and Japanese culture
• 📍 Smooth Relocation Support: Visa sponsorship, flight, Japanese lessons for overseas hires
• 🎉 Work-Life Balance: Flexible work hours, vibrant social scene, regular internal/external events
• ❤ Tech-Driven Culture: Technically strong leadership, value for thoughtful design & code quality
• 🙌 Collaborative Teams: Influence on product direction, autonomous agile teams

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Learn More

• Life at the company
• Employee stories
• Company Introduction Deck (incl. Assessment & Belt System)

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Selection Process

1. Solve an online coding challenge (must use Svelte)
2. Submit CV and cover letter
3. Casual interview with HR
4. 2–3 interviews with engineers (no live coding)
5. Final interview with CEO

The coding challenge is the only technical assessment—no live coding required.

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Ready to challenge the status quo in cybersecurity, design elegant solutions, and grow with a diverse, innovative team in Tokyo?

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