- We foster the cybersecurity development by supporting professional events.
- Our CEO and our Application Security Lead founded the OWASP Kyiv chapter in 2017. Two of the four people who run it today are BSG Experts; its meetups have been paused since the full-scale invasion.
- Our CEO joined the global OWASP Chapter Committee in 2020, the body that guides and supports OWASP chapters worldwide.
- BSG was an OWASP Foundation corporate member from December 2020 until February 2022, when the full-scale invasion ended it.
- Our CEO and our Application Security Lead co-founded NoNameCon in 2018, our Experts organised and volunteered at it, and BSG sponsored it for its first three years, including as premium partner in 2020.
- Our CEO co-organised the early editions of UISGCON, Ukraine’s oldest information security conference, from 2011, then stepped away; that conference last ran in 2019.
- Our Experts organised and volunteered at OWASP Ukraine, spoke from its stage and ran its CTF; that conference last ran in 2019. Our CEO has presented and volunteered at BruCON in Belgium, which still runs, and our Training Lead and Application Security Lead ran its CTF.
- Our team won Ukraine’s first SANS NetWars tournament in 2021.
- We found and disclosed CVE-2022-25854, a stored XSS in a widely used npm package.
- Our Application Security Lead is a top-100 researcher on BugCrowd and a repeat MVP.
Our Story
Our story began in 2014 when three prominent Ukrainian cybersecurity professionals have founded Berezha Security. Since then, our company has delivered 300+ projects to 130+ clients worldwide. We have customers in all major business sectors, including IT services, software products, banking, fintech, retail, healthcare, media, gaming, consulting services, legal and advisory, and many more. Review our public references on Clutch to get a better view of our clients.
Using our offensive mindset and experience, we help our customers develop a mindful approach to cybersecurity and integrate security principles into all aspects of their business.
We empower our clients to defeat tomorrow’s cybersecurity threats – today.
Our Certifications
Our team holds the industry's most demanding security certifications, independently validating expertise in penetration testing, application security, cybersecurity consulting, and red team operations.
Our contribution
Our Leadership Team
Andriy Varusha
Co-founder & COO CISSP
BSG services, operations, and quality leader.
IT auditor and cybersecurity consultant.
Andriy Varusha
Co-founder & COO
Andriy is an accomplished manager with 10+ years of experience in various industry verticals. He has started his IT audit and consulting career and continued in enterprise IT and custom software development services.
Andriy has experience in leading customer relationships within the US, UK, and Western Europe geographies, responsible for distributed teams and permanent engagements of different scales.
Andriy has stood at the root of the Ukrainian cybersecurity professional community and has joined BSG to advance his contribution to the cybersecurity industry's development.
At BSG, Andriy acts the Chief Services Officer and a security consulting practice lead.
https://www.linkedin.com/in/andriyvarusha/
/public/images/team/Andriy-Varusha_big.jpg
Vlad Styran
Co-founder & CEO CISSP, OSCP, CISA
BSG strategist.
Information security expert and community leader.
Vlad Styran
Co-founder & CEO
Vlad Styran is an internationally known infosec expert with 15+ years of experience in penetration testing, information security management, consulting, and audit. He holds CISSP, OSCP, and CISA certifications, demonstrating expertise across security management, technical penetration testing, and audit disciplines.
Vlad is a co-founder of the OWASP Kyiv chapter and the NoNameCon information security conference. He is a notable blogger, podcaster, and conference speaker.
At BSG, Vlad is responsible for our growth and customer experience. His involvement helps us to deliver first-rate consulting services in application security, security awareness, and information security strategy.
https://www.linkedin.com/in/styran/
/public/images/team/Vlad-Styran_big.jpg
Ihor Bliumental
Security Consultant,
Application Security Lead
Top 100 bug-hunter on BugCrowd.
Co-founder of OWASP Kyiv & NoNameCon.
Ihor Bliumental
Security Consultant, Application Security Lead
Ihor Bliumental is a world-class application security expert and one of the most successful bug-hunters globally. He was named the BugCrowd MVP multiple times and submitted around 150 vulnerabilities within bug bounty programs of global brands such as MasterCard, Netflix, Upwork, Tesla, and others.
At BSG, Ihor leads, plans, and coordinates all our security assessment projects and coaches the teammates on various cybersecurity aspects.
He is a compulsive book reader and a professional intellectual games team captain.
https://www.facebook.com/ihor.bliumental
/public/images/team/Ihor-Bliumental_big.jpg
Get in touch
Email us
Krakow office
al. Powstania Warszawskiego 15, Kraków, Poland