BSG Team

We Are BSG

Our team helps companies today to fight the cybersecurity threats of tomorrow. Meet the BSG superheroes!

All BSG crew members are highly-dedicated cybersecurity enthusiasts and recognized security experts – in Ukraine and abroad. All our mid- and senior-level consultants hold top cybersecurity certifications, OSCP, CISSP, CISA, among others. Our expertise in Application Security, Penetration Testing, and Information Security Consulting is proven by tens of completed projects with highly positive customer feedback.

Vlad Styran
Vlad Styran

Co-founder & CEO OSCP, CISSP, CISA

BSG business and cybersecurity strategist.
Cybersecurity expert, ethical hacker, keynote speaker, trainer, and consultant.

Vlad Styran
Co-founder & CEO

Vlad Styran is an internationally known cybersecurity professional with 15+ years of experience in Penetration Testing, Social Engineering, and Security Awareness. He currently holds OSCP, CISSP, and CISA credentials and was certified as C|EH, ISO27001LA, and many more throughout his career.

Vlad is a co-founder of the OWASP Kyiv chapter and the NoNameCon cybersecurity conference. He is a notable blogger, podcaster, and conference speaker.

At BSG, Vlad is responsible for our growth and customer experience. His involvement allows us to deliver first-rate cybersecurity consulting services in software security, cybersecurity awareness, cybersecurity strategy, and security investment.

https://www.linkedin.com/in/styran/
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Kostiantyn Korsun
Kostiantyn Korsun

Co-founder & COO

BSG Executive Director and business leader.
Cybersecurity expert, keynote speaker, and public figure.

Kostiantyn Korsun
Co-founder & COO

As former deputy head of Cybercrime Division at Security Service of Ukraine, Kostyantyn is a co-founder and the first head of CERT-UA. After resigning, Kos acted as Regional Director for the Ukrainian Research Office at iSIGHT Partners, an international cyber threat intelligence firm later acquired by FireEye Inc.

He is a prominent Ukrainian cybersecurity community member, a co-founder and the first Chairman of the Ukrainian Information Security Group (UISG), and a long-term head organizer of the UISGCON professional conference.

In BSG, he acts as an Executive Director and expert coach for the team, who shares his vast experience in cybersecurity, cybercrime research, and threat analysis.

https://www.linkedin.com/in/kostiantyn-korsun-58012b1b/
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Andriy Varusha
Andriy Varusha

Co-founder & CSO CISSP

BSG services, operations, and quality leader.
IT auditor and cybersecurity consultant.

Andriy Varusha
Co-founder & CSO

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 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 leads the Project Management Office and acts as a security consulting practice lead.

https://www.linkedin.com/in/andriyvarusha/
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Ihor Bliumental
Ihor Bliumental

Security Consultant,
Application Security Lead

Top 20 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
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Serhii Korolenko
Serhii Korolenko

Security Consultant, Training Lead

OSCP, eWPTX, eMAPT

Penetration tester. Conference speaker. OWASP Kyiv chapter leader.

Serhii Korolenko
Security Consultant, Training Lead

Serhii is a cybersecurity pro with vast experience in both Application Security and Penetration Testing. He manages the full spectrum of appsec assessments and penetration tests from the BSG portfolio.

As a training lead, he is always up to date on the latest security trends and is passionate about organizing conferences and speaking publicly. He presents and volunteers at various events, BruCON, OWASP Ukraine, NoNameCon, and TestingStage, among others.

Serhii is fond of sports videogames and loves riding the drone and take footage of his picturesque travels.

https://www.linkedin.com/in/sergiy-korolenko-82b2ab46/
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Anatolii Bereziuk
Anatolii Bereziuk

Security Consultant OSCP, eWPTXv2, eCPPTv2

Penetration tester. Security trainer.
OWASP Kyiv chapter leader.

Anatolii Bereziuk
Security Consultant

Anatolii is an information security professional who got bored with security management and compliance and transformed into a practical cybersecurity expert.

In the BSG team, he leads Penetration Testing and Application Security projects and consults customers on issue remediation.

Anatolii demonstrates a strong expertise in Web Application, Cloud Infrastructure, and Network security. He is an athlete and long-distance runner, and he never stops learning and sharing his knowledge at cybersecurity conferences.

https://www.linkedin.com/in/anatolii-bereziuk-400457145/
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Kyrylo Hobreniak
Kyrylo Hobreniak

Security Consultant OSCP, eWPTX

Penetration tester.
Security trainer.
OWASP Kyiv chapter leader.

Kyrylo Hobreniak
Security Consultant

Kyrylo is a cybersecurity consultant specializing in web and mobile Application Security analysis, wired and wireless network Penetration Testing, and Social Engineering security assessments.

His passion for cybersecurity developed from his dedication to technical disciplines and a superpower of accumulating practical knowledge in astronomical amounts. Kyrylo is a talented trainer, and he contributes to the cybersecurity community by volunteering at OWASP Kyiv, OWASP Ukraine, NoNameCon, and other professional movements.

https://www.linkedin.com/in/kireyn/
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Anna Zhmurko
Anna Zhmurko

Security Analyst CEH

Penetration Tester

Anna Zhmurko
Security Analyst

Anna is a security professional who focuses on Penetration Testing, web and mobile Application Security, and Social Engineering. She is highly skilled in malware analysis and security code review. Anna is CEH certified and works towards the OSCP title.

She is passionate about learning and hangs out and Cybrary and HTB, plays and wins CTF competitions, and solves online challenges.

Anna loves sharing her knowledge with colleagues and customers, she is fond of table games, and she has the most adorable puppy in the world.

https://www.linkedin.com/in/anna-zhmurko/
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Maksym Khramov
Maksym Khramov

Security Analyst

Penetration Tester.
Professional Community Volunteer.

Maksym Khramov
Security Analyst

Maksym is an information security specialist focused on Web Application Security Assessments and Network Penetration Testing. He is looking at cloud security as the next step in his professional advancement.

Maksym is keen to automate the manual security testing tasks and believes that comprehensive reconnaissance significantly increases the chances of finding security vulnerabilities.

He likes traveling and taking part in various hacking competitions and CTFs.

https://www.linkedin.com/in/maksym-khramov-435634130/
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Roman Hunko
Roman Hunko

Security Analyst

Penetration Tester.
Professional community volunteer.

Roman Hunko
Security Analyst

Roman is a cybersecurity engineer focused on the technical aspects of Penetration Testing, Application Security, and Social Engineering assessments.

Roman is working hard to develop his network pentesting skills and trains for the OSCP course and exam in the Hack The Box playground. Meanwhile, he has started sharing his knowledge with the community as the best way to learn something by trying to teach it.

Roman is a dedicated professional events volunteer and a hobbyist basketball player.

https://www.linkedin.com/in/roma-hunko-2a8900107/
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Roman Rott
Roman Rott

Software Engineer

Application Security enthusiast.
Professional community volunteer.

Roman Rott
Software Engineer

Roman is a full-stack software developer with more than ten years of programming experience who focuses on Web Application Development and Software Security.

At BSG, Roman develops our own software product, the D.A.R.T.S. pentest automation platform, which allows us and our clients to collaborate securely on sensitive pentest-related data. With Roman's help, we streamline our project activities, automate reporting, and integrate external data sources into our workflow.

Roman contributes to the cybersecurity community development by volunteering at NoNameCon and OWASP Ukraine professional events.

https://www.linkedin.com/in/rrott/
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Natalia Trubnikova
Natalia Trubnikova

Chief Marketing Officer

Natalia Trubnikova
Chief Marketing Officer

Natalia's expertise turns around digital marketing for B2B tech companies.

She is passionate about launching new projects, creating growth strategies, following a mix of inbound and outbound approaches to get the brand playing a long game.

She obtained global event organization experience by preparing brands for the industry roadshows and managing conferences, job fairs, celebrity meetings, etc.
At BSG, Natalia is responsible for brand evolution and expansion of market presence.

Natalia is fond of sports, long-distance running, and traveling.

https://www.linkedin.com/in/natali-trubnikova-85733ab7/
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