Marketing Assistant (Brand & Growth)

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AIM B2B by Custom Media KK is an award-winning, full-service B2B agency helping global brands connect with decision-makers across Japan and APAC through data-driven, creative marketing—especially in high-growth industries like AI, Clean Energy, Fintech, Healthcare, Manufacturing, and Technology. We specialize in strategy, storytelling, PR, content, and digital marketing that drive meaningful engagement and business growth.

We’re looking for a detail-oriented and proactive Marketing Assistant to support AIM B2B’s (https://aim-b2b.com/) brand visibility and demand generation. Working under the guidance of the Marketing Manager, you’ll help keep the day-to-day marketing engine running, contributing to content, campaigns, events, and operations, while building your skills across all aspects of B2B marketing.

1–2 years of experience in B2B marketing, content, or a related field (internship experience welcome).
Native English speaker with strong writing and editing skills.
Familiarity with content calendars, social media management, and basic campaign execution.
Experience with video editing tools and workflows
Some exposure to CRM or marketing automation tools (HubSpot a plus).
Comfortable with basic digital marketing concepts (SEO, email, paid social).
Organised and detail-oriented with the ability to manage multiple tasks and deadlines.
Proactive, eager to learn, and comfortable working both independently and collaboratively.
Ability to use AI tools responsibly to improve speed and quality across research, content, and reporting—while maintaining accuracy, originality, and brand voice.

Brand & positioning
Help maintain and refresh agency credentials, capabilities decks, case studies, and pitch collateral so the team is always “pitch ready.”
Support the translation of AIM B2B’s strategy and POVs into clear messaging across the website, social channels, and collateral.

Content, thought leadership, podcast & newsletter
Assist in building and maintaining the content and thought leadership calendar (articles, case studies, social posts, industry trend roundups).
Support the monthly Asia AIM podcast: assist with scheduling, briefing notes, recording coordination, video editing and distribution logistics.
Help execute the promotion plan for each podcast episode across channels (LinkedIn, email, website, social), including drafting copy and coordinating creative.
Manage monthly AIM B2B newsletter: assist with story selection, writing, editing, and performance tracking.
Support the production of AIM B2B’s annual Content Marketing Survey report, including coordination, writing assistance, and editing.
Track and report on content performance monthly (engagement, subscribers, downloads, open/click rates) and flag insights to the Marketing Manager.

Events & community (annual in-person event + quarterly webinars)
Support the planning and delivery of AIM B2B’s annual in-person event: assist with logistics, event page updates, promotional execution, registrations, and post-event follow-up.
Assist with quarterly webinars: coordinate speakers, manage registration pages, support live delivery, and assist with post-webinar nurture.
Help maintain event playbooks, timelines, and templates.
Repurpose event and webinar content into supporting assets (social posts, newsletter features, follow-up emails).

Demand generation & growth marketing (paid/owned/earned)
Support campaign execution that generates qualified inbound leads (content offers, webinars, landing pages, email nurture).
Assist the performance marketing team with monitoring and reporting on paid campaigns.
Help maintain and improve website landing pages and conversion paths.

New business support & CRM (HubSpot)
Collaborate with the Business Development team to align marketing activity with priority sectors and target accounts.
Maintain HubSpot records: update contact data, assist with list management, and support reporting dashboards.

Awards, partnerships, and community visibility
Assist in identifying and preparing industry award submissions.
Help maintain profiles across relevant partner platforms and directories.

What success looks like
Timely, high-quality execution of content, campaigns, and event logistics with minimal supervision.
Sales assets (case studies, one-pagers, capabilities decks) kept consistently up to date.
Reliable contribution to the Asia AIM podcast, AIM B2B newsletter, and content calendar.
Clear, well-maintained HubSpot records and accurate reporting.
Growing confidence in supporting demand generation campaigns and event delivery.

Bachelor’s degree in Journalism, Communications, Public Relations, Marketing, or a related field.

If you're a driven professional eager to work with companies that are revolutionizing the world, and you're excited to inspire and be inspired by an amazing team, we'd love to hear from you!

Please apply with a cover letter to careers@custom-media.com explaining what about this position appeals to you. Only shortlisted candidates will be contacted for an interview. No telephone calls please.

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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9:30am to 6:30pm Monday to Friday
Work from home and / or office flexibility

Work with leading B2B brands in revolutionary industries
Be part of a dynamic, collaborative team passionate about storytelling and marketing innovation.
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.
Paid vacations, social insurance and benefits.
Full exposure to all aspects of our business.
Network of established professionals and senior leaders.
Friendly, comfortable environment at a central office in Kamiyacho.

Saturdays and Sundays, National Holidays in Japan, Paid Vacation

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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