PART-TIME OFFICE ASSISTANT

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Custom Media, an award-winning integrated marketing agency based in central Tokyo. We are seeking a part-time, detailed-oriented and proactive office administrative assistant who can organize and execute their duties effectively.

We are seeking a Part-Time Office Assistant to manage the company's administrative tasks. This role is a hybrid position, requiring the successful applicant to work three days a week, with a minimum of two days based in our Kamiyacho office.

The ideal candidate will be a native Japanese speaker with a good command of English and over three years of office administrative experience.

Professional and Educational Background:
Bachelor's degree and at least 3 years of relevant professional experience.
Previous experience in office administration, reception, or customer service is a plus.

Core Competencies:
Communication: Native Japanese fluency is essential, along with a strong command of English and experience in a multicultural work setting.
Organizational and Management: Proven ability to exercise sound judgment, prioritize, allocate, and manage multiple tasks effectively.
Attention to Detail & Quality: A focus on quality assurance, consistently paying attention to detail and seeking to improve work processes.
Adaptability & Initiative: Proactive and flexible, capable of maintaining a positive and constructive attitude while working under pressure.
Technology: High proficiency in Microsoft Office applications and common Internet tools (e.g., Google Sheets, Docs).

Teamwork & Attitude:
An enthusiastic and passionate team player, willing to both offer insights and accept constructive feedback.

Office Administration and Support Duties:
Manage incoming and outgoing communications, including answering phones and processing postal mail.
Maintain and manage office supply inventory.

Human Resources Coordination:
Coordinate the onboarding process for new hires.
Liaise with the outsourced accounting firm regarding staff-related HR documentation (e.g., health insurance, pension).
Assist foreign employees with visa application document preparation.

Errands and Documentation:
As required, visit external offices (Law Office, Tax Office, Bank, etc.) to obtain official documents.

Bachelor's degree and at least 3 years of relevant professional experience.

Please apply with a cover letter to careers@custom-media.com explaining why you are the right person for this position.

Our agency is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

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3 days per week or 15 to 20 hours per week

Be part of a dynamic, collaborative multicultural team
Enjoy a flexible, hybrid/remote work environment.
Opportunities for professional growth and continuous learning.
Attractive salary negotiable based on experience.
Transport allowance, work from home allowance.
The company will provide laptop with required software.
Friendly, comfortable environment at a central office in Kamiyacho.

Saturdays and Sundays, National Holidays in Japan

Hybrid (remote + office)

Country / Region

Japan

Prefecture (State)

Tokyo

Location (Address)

Minato-ku

Toranomon 5-13-1

Toranomon 40MT Building 7F

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Custom Media is an award-winning, full-service B2B agency that connects Japan with the world, delivering data-driven, creative marketing solutions to help our clients in revolutionary industries—AI, Clean Energy, Fintech, Healthcare, Manufacturing and Technology—shape the future.

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