Bart Pielaszek

Global Head Of Marketing, Opera GX

Opera

Jun 2022 - Current (4 years 3 months)

Lead Global Growth Strategy: Overseeing marketing for Opera GX’s gaming browser used by millions worldwide, translating product differentiation into sustained user acquisition and retention. Data-Driven Growth & Experimentation: Developed a high-velocity experimentation program (A/B/N tests, funnel optimizations) to continuously improve performance marketing ROI and user engagement. Team Building & Leadership: Built and manage a 20+ person global marketing team, blending brand, performance, influencer, and affiliate marketing functions. Implemented systems and frameworks that enable compounding growth (so successes scale quarter over quarter).

Founder/Growth Advisor

Growth Collective

Feb 2018 - Current (8 years 7 months)

Growth Consulting: Advise B2B tech companies on building scalable, data-driven growth engines — including growth audits, full-funnel optimization, marketing automation, and analytics implementation. Results: Implemented experimentation systems that delivered measurable revenue and efficiency gains, including: - Tripled inbound leads for a SaaS provider through paid acquisition and CRO improvements - Reduced CAC by 40% for a software company by restructuring performance marketing and attribution models - Generated 7-figure pipeline uplift for a corporate travel platform by combining outbound automation with targeted landing page experiments tailored to B2B buyer journeys Community & Thought Leadership: Organize growth marketing meetups, wo

Alumni

Reforge

Mar 2022 - Feb 2023 (1 year)

Completed a year-long program at Reforge, including three advanced courses: Growth Series, Advanced Growth Strategy, and Brand Marketing. Reforge is known for its practitioner-led curriculum used by growth leaders at top technology companies. The program focused on building scalable growth systems, experimentation frameworks, and using brand as a long-term growth lever, with direct application to senior operator roles.

Senior Marketing Manager (Global)

Opera

May 2020 - Jun 2022 (2 years 2 months)

Growth Phase Leadership: Hand-picked to spearhead Opera GX’s hyper-growth phase – grew the marketing team from 1 to 21 and established core functions (performance, brand, influencer, affiliate). Channel Expansion: Built Opera GX’s performance marketing capability nearly from the ground up, alongside launching global influencer and affiliate programs. Scaled paid acquisition, influencer, and affiliate partnerships across North America, Europe, and Asia — integrating them into a unified, full-funnel growth engine. Record User Growth: Delivered +350% YoY growth in monthly active users by aligning product, community, and paid acquisition strategies. Ensured marketing efforts translated into sustained user retention and engagement, not just ac

Growth Marketing Mentor

GrowthMentor

Sep 2019 - Dec 2021 (2 years 4 months)

Provided 1:1 mentoring to founders and growth leaders on building and scaling data-driven growth programs. Advised on experimentation frameworks, acquisition strategy, funnel optimization, and early-stage growth systems. Selected as an invite-only mentor on GrowthMentor, a curated platform connecting experienced operators with early-stage founders and teams.

Head of Growth Marketing

Tagvenue

Jul 2019 - Apr 2020 (10 months)

Reported 100% YoY user growth for Tagvenue, a global online marketplace for venue hire (8,000+ venues across UK, EU, AUS, SG). As Head of Growth Marketing (reporting to the CEO), owned end-to-end acquisition and conversion strategy from running rapid experiments to optimizing funnels for business clients.

Senior Growth Strategist & Team Lead

Ladderio

Oct 2018 - Jul 2019 (10 months)

Led a team of 5 growth specialists at a growth marketing agency, delivering full-funnel growth programs for a portfolio of 10+ clients ranging from Y Combinator startups to Fortune 500 companies. Drove client success across industries: Developed and executed growth strategies and experimentation roadmaps for clients such as Booking.com, Nestlé, Yara International, Privacy.com, and more. Focused on measurable KPIs – e.g., improved ROI on ad spend by up to 200% and increased conversion rates for multiple clients. Owned key growth metrics: Oversaw campaigns across paid acquisition, CRO, and analytics, ensuring each initiative was tied to ROI and learnings. Regularly presented results and insights to C-level client stakeholders, influencing t

Growth Marketing Strategist

Ladderio

Oct 2017 - Sep 2018 (1 year)

Consulted with founders & executives to design and implement data-driven growth strategies across acquisition, conversion, and retention stages. Acted as the cross-functional lead, coordinating marketers, designers, and engineers to run rapid experiments and iterate on growth tactics. Developed a reputation for turning behavioral insights into optimization wins across major digital channels.

Country Manager Poland

Fiyo

Jan 2017 - Oct 2017 (10 months)

Owned growth and performance for the Polish market of Fiyo (Eindhoven-based e-commerce company). Led localized digital marketing, website optimization, and commercial experimentation to drive online sales. Implemented a structured experimentation program: Introduced data-driven testing for marketing and product changes – including pricing and checkout optimizations – which resulted in a +32.9% increase in products purchased and +18.0% higher average order value in 6 months. Optimized customer acquisition and analysis: Ran continuous analysis–test–iterate loops for campaigns, improving conversion rates and user engagement. Also conducted market research and competitive analysis across 8 international markets to inform Fiyo’s broader strate

Co-founder/Growth Manager

Student Festival

Jun 2013 - Dec 2016 (3 years 7 months)

Co-founded and scaled a student events venture from small campus parties into a multi-city festival format. Grew operations to 4,300 attendees across 26 venues in two cities, with events running simultaneously. Led all growth and promotion efforts: Used creative guerrilla marketing and multi-channel campaigns (Tinder, Snapchat, Facebook ads, out-of-home) to build the brand. Achieved high event sell-out rates and year-over-year attendee growth of >50%. Learned lean growth under real-world constraints: This early venture honed my ability to drive engagement on a shoestring budget, instilling an experimental mindset and scrappy tactics that I’ve carried into later roles.

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