Who we are.

Certified, professional ethical hackers with a passion for cyber security—driven to exceed expectations and deliver real results.

About Us.

With over a decade’s pioneering work, Heretek stands at the forefront of cybersecurity innovation. Our seasoned expertise in Public, Financial, Gaming, and Defence sectors has solidified our reputation as the architects of excellence.

Heretek is a cyber security company built by hackers, for the real world. We’re a small but sharp team of security specialists who believe that breaking things is the first step to securing them. Whether it’s probing the edges of a new AI application or digging deep into enterprise infrastructure, we approach every engagement with curiosity, creativity, and a commitment to doing things right.

We’re not here to throw jargon around or sell silver bullets. We work closely with our clients to understand their unique challenges and provide clear, actionable advice that actually makes a difference. At Heretek, we’re driven by a passion for the craft, a healthy respect for the adversary, and a belief that security should empower, not hinder. If you’re looking for a partner who speaks your language—whether you’re blue team, red team, or somewhere in between—you’re in the right place.

Our unique ‘Purple Cybersecurity’ philosophy is the cornerstone of our services. Embodying a strategic blend of Red Team’s offense and Blue Team’s defence, this holistic approach ensures dynamic protection and adaptability against cyber threats.

Experience the future of cyber vigilance with our state-of-the-art Monitoring Portal. Our platform sets the standard in real-time visibility, offering an intuitive interface that brings complex data to life. Our portal provides actionable insights, enhancing operational efficiency and enabling a proactive response to emerging threats.

MEET OUR TEAM.

We’re a tight-knit crew of security pros, hackers, and curious minds who love what we do. Each of us brings a different background—pen testing, incident response, red teaming, AI, and more—but we’re united by a shared obsession with breaking things safely and helping people build stronger defences. We’re hands-on, straight-talking, and always up for a challenge. Come say hi—we’re human first, hackers second.

JON MEDVENICS
JON MEDVENICSChief Hacker
CLAUDIA WHITESIDE
CLAUDIA WHITESIDEClient Growth Manager
STUART PEARCE
STUART PEARCEChief Operations Officer
PRAFUL MAJEVADIA
PRAFUL MAJEVADIABusiness Development Manager
ELYSE RONZIER
ELYSE RONZIERHacker
LIAM DINSDALE
LIAM DINSDALEAssociate Hacker

ACCREDITATIONS & CERTIFICATIONS.

We take our craft seriously, and our certifications reflect that. Heretek holds organisational accreditations recognised by government and industry bodies, while our consultants carry individual, hands-on qualifications from globally respected schemes. Our expertise is grounded in Red Team offensive techniques, backed by a Blue Team understanding of defensive practices, meaning we don’t just identify vulnerabilities, we provide pragmatic, real-world guidance on how to fix them.

Organisational Accreditations

CREST

CREST is a UK not-for-profit accreditation and certification organization. Recognised by NCSC as certifying that penetration testers can perform at the highest levels.

Cyber Essentials Plus

A UK Government-backed certification confirming the essential technical controls needed to defend against common cyber attacks, with Plus independently, hands-on tested by an assessor.

Procurement Frameworks

Crown Commercial Service Supplier

Approved supplier on UK Government procurement frameworks.

Consultant Certifications

Cyber Scheme

A UK, NCSC-certified body for penetration testing exams, professional registrations, and assessments for schemes like CHECK.

OffSec

Offensive Security is a private U.S. company working in information security, penetration testing and digital forensics.

GIAC/SANS

GWAPT and GXPN sharpen our offensive capability; GCIH and GSEC ground our remediation advice in real-world defensive practice.

IASME Cyber Assessor

Qualified to independently assess and certify organisations for Cyber Essentials.

Recognition

Cyber Runway: Grow Graduate

A graduate of Cyber Runway: Grow, DSIT and Plexal’s six-month accelerator for UK cybersecurity start-ups.

Ready to Secure What Matters?

See your security through an attacker’s eyes then close the gaps before they strike.

Get in touch with Heretek today to get:

  • Industry-leading tools and proven methodologies

  • Comprehensive, actionable results

  • Cost effective and scalable solutions

are you ready to discover your hidden vulnerabilities?

Get in touch and let Heretek assess your systems before it’s too late.

You can’t fix what you don’t check so get in touch today.

  • Industry leading tools and methodologies

  • Comprehensive and detailed results

  • Cost effective and scalable