Our People

Our vision

At Fortify, we’ve brought together some of the sharpest minds in fraud prevention – data scientists, engineers, fraud strategists, and operators who’ve spent years inside the systems that power global finance.

Our team has designed, built and deployed the best fraud systems in the world for banks, airlines, national payment infrastructures, and high-stakes financial networks. We’ve built platforms that protect trillions in global transactions and tackle everything from card fraud to money laundering.

We know what works and what doesn’t. We’ve felt the frustration of outdated tools – and we’ve built Fortify to solve those problems.

Our leadership team

Real expertise. Real-world experience. Real outcomes. That’s who we are.

Julia Warring
Co-Founder & Director of Operations
Julia Warring
Co-Founder & Director of Operations
Julia brings broad experience across technology, sales, project management, and design – giving her a deep understanding of what Fortify needs to grow strategically and sustainably. She’s driven to build a company where people thrive: united by purpose, proud of their impact, and excited to shape the future of fraud prevention. Working in close partnership with Karthik, Julia leads business operations – covering every detail so the technologists can move fast and deliver what our clients are counting on us to do.
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Karthik Tadinada
Founder & CEO
Karthik Tadinada
Founder & CEO
Karthik has spent over a decade building fraud prevention systems for global banks, airlines, and payment networks. As COO of Featurespace, he led the development of real-time fraud detection technology that protects over 50 billion transactions a year. With a PhD in Electrical and Information Engineering from Cambridge University, Karthik brings an unparalleled combination of technical mastery, strategic vision, and real-world financial services experience.
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Calandra Smith
Head of Marketing
Calandra Smith
Head of Marketing
With global experience from education to fintech, Calandra is full-stack marketer who knows how to build momentum. She’s championing Fortify’s mission – arming fraud teams with the clarity, confidence, and tools to act fast. And driving how we show up, tell our story, and bring together a community of people solving fraud differently – and more effectively.
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Tom Flowerdew
Director of AI Products
Tom Flowerdew
Director of AI Products
Tom brings deep expertise in data science, fraud modelling, and product strategy. He’s led global teams at Featurespace and Mastercard, delivering world-first solutions in AML, crypto, and scam detection. From model design to product delivery, he turns advanced technologies into tools that help customers move faster, make smarter decisions, and stay ahead of evolving threats.
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Andres Rojas
Director of the Americas
Andres Rojas
Director of the Americas
Andres brings deep expertise in fraud prevention, AML, and customer success. He’s led commercial and operations teams at fintechs and global enterprises including Featurespace, ConnexPay, and SAP Concur. With experience across the US, Latin America, and Europe, he helps turn complex fraud challenges into practical solutions that deliver ROI.
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Alistair Markham
Chief Engineer – Core Engineering
Alistair Markham
Chief Engineer – Core Engineering
With over 20 years in software engineering, Alistair has innovated at companies from startups to multinationals. At Featurespace, he built their in-house model definition tech, used in real-time fraud solutions around the world. Based in Cambridge, his expertise also spans search and quantitative finance - with a focus on performance, precision, and solving complex data challenges at scale.
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Fortify’s offer is unique and unrivalled - they provide total support across strategy, software and data science so your entire system performs

Karim Ahmad

ex-CPO TSYS

Build what matters. With people who do, too.

Join a team of sharp minds, fast learners, and problem-solvers reshaping the future of fraud prevention.

Explore Careers at Fortify