Sebastian S.
Head of International Growth | GTM | Cloud x Media x AI | Corporate Innovation Accelerator | I help businesses capture ~$2b revenue through experiences, 0p data activation & AI+human synergies
Every industry is being reshaped by the intersection of media, cloud, & That's where I focus my
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I started by helping global advertisers measure what matters, building marketing mix models that turned data into action. From there, I moved into insight, growth, and now, reimagining commercial architecture for international expansion. My strength is bridging the worlds of marketing and technology. I translate between teams and unlock progress where others see Today, I help lead international growth at Chesamel, a London-based business transformation consultancy. Together with the Advertising Big 6 and major consulting firms, we pioneer new approaches across the US, GCC, Southeast Asia, and Japan. I also take on select mandates through Shimomichi Strategic Advisors, always with the same commitment to confidentiality and partnership I bring to every I collaborate with C-suite and VP leaders across AI, cloud, B2B software, retail, luxury, and the public sector. I always focus on what matters most to them. My approach is hands-on and partnership-driven: together, we align on priorities, communicate clearly, and move quickly to meet evolving business needs. In Japan, I work directly in If you are interested in working together, the first step is a brief conversation to discuss your goals and challenges. From there, I outline a tailored approach and actionable next This is just the beginning of how we can reinvent what growth looks like, together.
GTM Index
- PAVILIONJOB
- Executive Member9M
Executive Member
Pavilion
Executive member of a global community of B2B Sales & Marketing leaders (CROs, CMOs etc).
- SSAJOB
- Fractional Commercial Grow…1Y 9M
Fractional Commercial Growth Leader (AI/Digital/Retail)
SSA LLC
Fractional leadership for a select number of early stage startups in fintech, cloud computing and digital media.
- CHESAMEL GROUPJOB
- Global GTM Lead9M
Global GTM Lead
Chesamel Group
Global Commercial Growth & AI Value Realization for Enterprise • Built the international GTM engine from a standing start: a 100+ account named-account list (NAL) across the US, APAC and Japan, a bottom-up pipeline model adopted by leadership for target setting, and outbound sequencing live against a $300M addressable market • Designed a data-driven sales playbook pairing dynamic account scoring and region-tailored outreach with automation layered under personalized executive engagement, lifting conversion rates 20–30% across target regions • Executed the playbook end to end to deliver 50+ C-suite and VP engagements, 10+ qualified meetings, and 5+ shipped proposals across the US, Singapore…
- CREATIVE DOCK GROUPJOB
- Enterprise Venture Architect11M
Enterprise Venture Architect
Creative Dock Group
Joint Venture Structuring and Investment Diligence • Structured joint venture investments alongside a leading Japanese private equity firm, underwriting to a minimum 5x ROI threshold • Conducted market research and due diligence to qualify venture opportunities for enterprise clients in FMCG, Pharma, Manufacturing & Advertising • Built value realization scenario models to pressure-test investment cases and inform go and no-go decisions
- SYSTANGOJOB
- Head of APAC (PMF/GTM/Sales)11M
Head of APAC (PMF/GTM/Sales)
Systango
APAC Market Entry & Commercialization • Developed and launched Systango's APAC go-to-market strategy, establishing the firm's commercial presence in the region • Repositioned engineering-led offerings, spanning GenAI, data platforms, and cloud, around the priorities of C-suite decision-makers and the business outcomes they buy against • Built regional visibility through industry exhibits and VIP roundtable events
- PUBLICIS GROUPEJOB
- Senior Dir, Data & Technol…2Y 11M
Senior Director, Data & Technology
Publicis Groupe
AI Product-led Growth GTM • Developed programmatic AI solutions built on Japan-first principles for enterprise clients spanning marketing software, pharmaceuticals, and consumer health • Introduced consultative frameworks across the full sales cycle that simplified data and AI for client stakeholders, improving transformation outcomes across Japan C-Suite Advisory on Marketing Effectiveness • Designed and led C-suite workshops on efficiency, cutting data acquisition complexity and raising marketing ROI (mROI) • Sharpened CDP investment decisions for enterprise clients, improving return on existing platform spend
- ACCENTURE STRATEGY & CONSULTINGJOB
- Consultant2Y 11M
Consultant
Accenture Strategy & Consulting
Enterprise Transformation and Operating Model Design • Led end-to-end transformation programs for $1B+ consumer businesses across Southeast Asia, from strategy design through capability deployment • Advised boards and C-suite leaders on enterprise operating model, growth and go-to-market roadmaps, and organization design, including headcount analysis and strategic trade-offs • Designed and activated scalable enterprise and functional operating models across front and back office for global matrixed clients in financial services, mining, and consumer goods • Developed capability architectures, organization structures, and governance mechanisms across 3 key markets, underpinning 19% year-on-…
- ACCENTURE SONGJOB
- Consultant3Y 11M
Consultant
Accenture Song
Digital Product Strategy and Delivery • Delivered digital products end to end across design, build, test, and deploy, setting the product vision, customer experience, and roadmap • Defined use cases and MVP scope, prioritized product backlogs, and wrote acceptance criteria for user stories • Ran A/B tests and consumer research, converting findings into shipped product enhancements • Mapped business processes, rollout and operating plans, workflow models, and wireframes; coached client delivery teams in Agile • Managed engagement execution end to end: risk identification and mitigation, client expectations, resourcing, and budget Marketing Technology and Personalization • Led delivery of…
- MRMJOB
- Data Analytics Mgr2Y 11M
Data Analytics Manager
MRM
- GOOGLEJOB
- Data Analyst1Y 11M
Data Analyst
Google
- Job: Creative Dock Group — Enterprise Venture Architect · 2025 – 2025 · 0 mo — Joint Venture Structuring and Investment Diligence • Structured joint venture investments alongside a leading Japanese private equity firm, underwriting to a minimum 5x ROI threshold • Conducted market research and due diligence to qualify venture opportunities for enterprise clients in FMCG, Pharma, Manufacturing & Advertising • Built value realization scenario models to pressure-test investment cases and inform go and no-go decisions
- Job: Accenture Strategy & Consulting — Consultant · 2021 – 2023 · 2y — Enterprise Transformation and Operating Model Design • Led end-to-end transformation programs for $1B+ consumer businesses across Southeast Asia, from strategy design through capability deployment • Advised boards and C-suite leaders on enterprise operating model, growth and go-to-market roadmaps, and organization design, including headcount analysis and strategic trade-offs • Designed and activated scalable enterprise and functional operating models across front and back office for global matrixed clients in financial services, mining, and consumer goods • Developed capability architectures, organization structures, and governance mechanisms across 3 key markets, underpinning 19% year-on-…
- Job: Pavilion — Executive Member · 2026 – present · 7 mo — Executive member of a global community of B2B Sales & Marketing leaders (CROs, CMOs etc).
- Job: MRM — Data Analytics Manager · 2016 – 2018 · 2y
- Job: SSA LLC — Fractional Commercial Growth Leader (AI/Digital/Retail) · 2025 – present · 1y 7mo — Fractional leadership for a select number of early stage startups in fintech, cloud computing and digital media.
- Job: Systango — Head of APAC (PMF/GTM/Sales) · 2025 – 2025 · 0 mo — APAC Market Entry & Commercialization • Developed and launched Systango's APAC go-to-market strategy, establishing the firm's commercial presence in the region • Repositioned engineering-led offerings, spanning GenAI, data platforms, and cloud, around the priorities of C-suite decision-makers and the business outcomes they buy against • Built regional visibility through industry exhibits and VIP roundtable events
- Job: Google — Data Analyst · 2015 – 2016 · 1y
- Job: Accenture Song — Consultant · 2018 – 2021 · 3y — Digital Product Strategy and Delivery • Delivered digital products end to end across design, build, test, and deploy, setting the product vision, customer experience, and roadmap • Defined use cases and MVP scope, prioritized product backlogs, and wrote acceptance criteria for user stories • Ran A/B tests and consumer research, converting findings into shipped product enhancements • Mapped business processes, rollout and operating plans, workflow models, and wireframes; coached client delivery teams in Agile • Managed engagement execution end to end: risk identification and mitigation, client expectations, resourcing, and budget Marketing Technology and Personalization • Led delivery of…
- Job: Chesamel Group — Global GTM Lead · 2026 – present · 7 mo — Global Commercial Growth & AI Value Realization for Enterprise • Built the international GTM engine from a standing start: a 100+ account named-account list (NAL) across the US, APAC and Japan, a bottom-up pipeline model adopted by leadership for target setting, and outbound sequencing live against a $300M addressable market • Designed a data-driven sales playbook pairing dynamic account scoring and region-tailored outreach with automation layered under personalized executive engagement, lifting conversion rates 20–30% across target regions • Executed the playbook end to end to deliver 50+ C-suite and VP engagements, 10+ qualified meetings, and 5+ shipped proposals across the US, Singapore…
- Job: Publicis Groupe — Senior Director, Data & Technology · 2023 – 2025 · 2y — AI Product-led Growth GTM • Developed programmatic AI solutions built on Japan-first principles for enterprise clients spanning marketing software, pharmaceuticals, and consumer health • Introduced consultative frameworks across the full sales cycle that simplified data and AI for client stakeholders, improving transformation outcomes across Japan C-Suite Advisory on Marketing Effectiveness • Designed and led C-suite workshops on efficiency, cutting data acquisition complexity and raising marketing ROI (mROI) • Sharpened CDP investment decisions for enterprise clients, improving return on existing platform spend
- School: HEC Paris — Artificial Intelligence
- School: New York University — Computer Science
- School: General Assembly — Data Science
- School: Hunter College — Bachelor's degree, Business/Managerial Economics
Skills
Playbooks
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