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Greg Sewastianowicz

Greg Sewastianowicz

Data driven Chief Marketing, Growth & Digital Officer with global expertise in eCommerce, gaming & fintech

London, England

Data-driven Chief Marketing, Growth & Digital Officer with a record in building global teams, growing profits and implementing high-growth marketing, eCommerce, digital and product strategies within $billion public listed companies and enterprising start-ups.


1. Development and hands-on execution of Business, Growth, Go To Market, Marketing & Brand Strategies for Digital Products & Services

Successfully implemented $multi-million international growth strategies and marketing / eCommerce / digital communication plans across EMEA, APAC, MENA, CIS, LATAM and NORAM

- Launched profitable global digital products & services in gaming, entertainment, fintech, eCommerce and mobile apps;
- Delivered unique and sophisticated rebranding projects (including building mobile apps, web portals and loyalty programs)
- Successfully introduced digital products to new territories;
- Built and actively managed product and marketing teams of 100+ capable to scale-up activities in 30+ languages.

2. Implementation of Growth Engine Components & Growth Hacking culture across the business

Scaled up activities x100s times, improved profitability/CLV/ROI/CAC and saved $millions by optimising customer journeys and setting up evergreen growth experiments across customer life cycle stages.

- Scaled up acquisition numbers through organic, social, paid, affiliate and referral channels
- Improved product and sales profitability as well as retention, reactivation, referral and monetisation rates by reducing waste and optimising customer journeys (web, mobile, social, in-product)
- Brought digital know-how in house by setting up internal digital marketing agencies and growth groups/squads focused on actionable “small KPIs”
- Optimised results and automated processes by implementing bespoke adtech and martech stacks
- Worked in senior positions for companies from all sides of digital marketing industry (agency and network side, publisher side, client side and as an independent consultant).


  • Head of Digital Marketing | Gaming & Gambling, eCommerce, Global Digital and Performance Marketing (PokerStars)
  • VP Growth | Growth / Marketing Director | Global Marketing, Digital, Acquisition, CRM, Data, Gaming (CCP)
  • Chief Growth Officer | CGO | Strategy, Product, Marketing, Digital, Data (
  • Head of Marketing | Global Marketing, Financial Services, eCommerce, Digital Marketing & Strategy (ETX Capital)
  • Chief Marketing Officer / CMO | eCommerce, Data, Growth, Performance, Brand, Strategy (


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