Results-driven digital marketing and brand partnerships professional with 6 years of experience at Twitter/X and Socialdatabase. I specialized in luxury and high-end retail campaigns at X, where I developed and optimized data-driven advertising strategies, built strategic brand collaborations, and delivered significant revenue growth for premium clients. With global experience living and working in Japan and currently the Netherlands, I bring a strong multicultural perspective and proven success in cross-functional team collaboration across international markets. Passionate about luxury, fashion, and editorial storytelling, I excel at structuring commercial partnerships, enhancing client satisfaction, and driving measurable business impact. I am immediately available for this freelance opportunity and would welcome the chance to discuss how my luxury brand expertise and partnership-closing track record can help secure and deliver high-profile collaborations for your editorial project.

Kei Yamaguchi

Results-driven digital marketing and brand partnerships professional with 6 years of experience at Twitter/X and Socialdatabase. I specialized in luxury and high-end retail campaigns at X, where I developed and optimized data-driven advertising strategies, built strategic brand collaborations, and delivered significant revenue growth for premium clients. With global experience living and working in Japan and currently the Netherlands, I bring a strong multicultural perspective and proven success in cross-functional team collaboration across international markets. Passionate about luxury, fashion, and editorial storytelling, I excel at structuring commercial partnerships, enhancing client satisfaction, and driving measurable business impact. I am immediately available for this freelance opportunity and would welcome the chance to discuss how my luxury brand expertise and partnership-closing track record can help secure and deliver high-profile collaborations for your editorial project.

Available to hire

Results-driven digital marketing and brand partnerships professional with 6 years of experience at Twitter/X and Socialdatabase. I specialized in luxury and high-end retail campaigns at X, where I developed and optimized data-driven advertising strategies, built strategic brand collaborations, and delivered significant revenue growth for premium clients.

With global experience living and working in Japan and currently the Netherlands, I bring a strong multicultural perspective and proven success in cross-functional team collaboration across international markets. Passionate about luxury, fashion, and editorial storytelling, I excel at structuring commercial partnerships, enhancing client satisfaction, and driving measurable business impact.

I am immediately available for this freelance opportunity and would welcome the chance to discuss how my luxury brand expertise and partnership-closing track record can help secure and deliver high-profile collaborations for your editorial project.

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Language

English
Fluent
Japanese
Fluent

Work Experience

Business Development Manager (APAC) at SOCIALDATABASE, Amsterdam
August 1, 2024 - Present
Led APAC business development, driving revenue growth through proactive client acquisition, lead nurturing, and cross-functional collaboration with account management and marketing teams. Negotiated agency contracts, generating over €1.1M in new revenue and forging long-term strategic alliances across multiple regions and verticals. Achieved an average 600% YoY revenue growth through data-driven optimization and client-facing consulting.
Business Development Manager at SOCIALDATABASE, Amsterdam
August 1, 2024 - Present
Led APAC business development, achieving a 600% YoY revenue increase on average through proactive client acquisition, lead nurturing, and cross-functional collaboration with Account Management and Marketing teams. Negotiated agency contracts, generating over €1.1M in new revenue and establishing long-term strategic alliances across multiple regions and verticals.
Business Development Manager at Social Data Base
August 1, 2024 - Present
Boosted revenue by 600% YoY through proactive client acquisition, lead nurturing, and cross-functional collaboration with Account Management and Marketing teams. Spearheaded innovative agency contract negotiations, generating more than €1.1M in new revenue and establishing long-term strategic alliances across multiple regions and diverse business verticals.
Client Account Manager at X Corp. (Twitter, Inc.), Tokyo
March 1, 2020 - June 1, 2024
Managed renewals and provided data-driven insights to craft and execute strategic marketing plans for business growth. Worked mainly with Luxury and Sport brands, achieving over 30% YoY revenue growth by implementing innovative strategies. Collaborated with agencies to analyze marketing mix models and evaluate platform presence, driving increased spend and client satisfaction.
Client Account Manager at X Corp. (Twitter, Inc.)
March 1, 2020 - June 1, 2024
Managed renewals and supported clients with data-driven insights to develop and execute strategic marketing plans for business growth. Worked mostly with Luxury brands and Sport Brands, achieving over 30% YoY revenue growth by implementing innovative strategies. Collaborated with agencies to analyze marketing mix models, conducting in-depth valuations of platform presence, driving increased spend and client satisfaction.

Education

Bachelor's Degree at International Christian University, Tokyo
April 1, 2016 - March 31, 2020
Exchange at University at Buffalo, SUNY
August 1, 2018 - May 1, 2019
Bachelor's Degree in Communication and Media at International Christian University, Tokyo
April 1, 2016 - March 1, 2020
Exchange Program at University at Buffalo, SUNY, Buffalo NY
August 1, 2018 - May 1, 2019

Qualifications

Add your qualifications or awards here.

Industry Experience

Retail, Software & Internet, Media & Entertainment, Professional Services, Other