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BARBARA TESZLER
BARBARA TESZLER
Product Consultant
web + mobile
email: barbara@teszler.com
Hi, I’m Barbara, a product manager who loves turning complex challenges into innovative but practical solutions. With over 20 years of experience across cybersecurity, utilities, gaming, and publishing, I’ve led teams, shaped strategies, made friends and delivered products that impact and improve lives.
I thrive in messy, high-stakes environments - whether it’s scaling SaaS platforms, navigating tough decisions, or bringing structure to the chaos of product development. I take my work seriously, but I also believe every great meeting could use less jargon, more clarity, and definitely more coffee.
Let’s build something great together.
What I Bring to the Table
What I Bring to the Table
Data-driven decision-making
Translating technical complexity into actionable strategies
Building cross-functional team alignment
Ensuring customer-centric outcomes
"Barbara is proactive working with both customers and internal stakeholders. I worked with her as she navigated some very challenging stakeholders and was impressed with her resiliency and resolve."
- Todd Whitaker
Director of Product Management Former Line Manager
"What I admire the most about Barbara is her honesty. She is true to herself but most importantly to the people she works with! "
- Joana Sá
Product Designer
"Barbara's commitment to excellence is evident in her thorough user research and her strategic execution of multiple experiments to validate business value"
- Miray Mazlumoglu
Principal Software Engineer
"Barbara listens to the expertise of her team but challenges decisions at the right time and in the right way to keep her team focussed on the target."
- Adam Bruzon
UX Designer
Experience
Experience
NESO (Jun 2025 - present): Product Consultant
Wallarm (Oct 2023 – Feb 2025): Senior Product Manager (IC contract)
HackerOne (Oct 2021 – Sep 2023): Senior Product Manager
British Gas (May 2018 – Oct 2021): Product Owner
City A.M. (Nov 2016 – Mar 2018): Head of Product Development
PokerStars (Sept 2015 – Aug 2016): Technical Product Manager
EurotaxGlass’s (Feb 2014 – Aug 2015): Technical Product Manager & Support Manager
GREE UK Ltd (Aug 2012 – Oct 2012): Senior Software Engineer
Gala Coral Group (Sep 2006 – Aug 2012): Games Development Manager
Various Software Engineering & Product Roles (2000 – 2006) at GREE UK Ltd, The ABC Connection, ADVFN, Becomo.com, Expro.pl, INTERIA.PL, and Dagma Sp. z o.o., working on web applications, API integrations, and platform automation
Enhanced Digital Self-Service for Millions: Spearheaded the development of a self-serve repair booking system for 9 million British Gas customers, achieving a 96% conversion rate and the highest NPS score across the company.
Led the launch of British Gas Rewards, an award-winning programme engaging 9M customers – onboarded 1M members within a year despite low digital activity of the userbase.
Drove Hacker-Facing Innovation: At HackerOne, led the strategy and roadmap for nine hacker-facing products, launching an AI-powered matching system that tripled engagement rates in a 1.5 million-strong ethical hacker community.
Transformed Digital Presence: As Head of Product Development at City A.M., directed a digital overhaul that increased user engagement by 40% and page views by 45%, while modernizing the online platform for a leading financial newspaper.
Streamlined Game Development: At Gala Coral Group, managed the design and release of 37 games, implementing agile development and reducing time-to-market by 20%, saving over £0.5m through strategic integration.
Improved Data Operations: Stabilized flagship valuation products at EurotaxGlass’s, improving system uptime from 90% downtime to 99% uptime and cutting ticket resolution time from one year to two weeks.
Optimized Marketing Networks: At PokerStars, devised a marketing content network solution that cut costs by 80%, driving efficiency in affiliate management systems with critical fixes
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