Cybersecurity - Threat Management, Detection, & Response (Penetration Tester) - Senior Consultant

Ernst & Young Advisory Services Sdn Bhd; Toronto; On-site; CAD 100,000 - 130,000; Full time

Job summary

A leading consulting firm in Toronto is seeking a Senior Penetration Tester to join their Offensive Security team. The successful candidate will focus on conducting penetration tests and threat emulation while collaborating with a diverse group dedicated to cybersecurity excellence. The role emphasizes continuous learning and personal growth, aiming to equip you for a successful career in the cybersecurity landscape.

Benefits

Continuous learning opportunities

Diverse and inclusive work environment

Qualifications

• 5+ years of recent experience in offensive security, including penetration testing.
• Expertise in developing malware and custom tooling.
• Strong communication and presentation skills.

Responsibilities

• Perform offensive security engagements including penetration testing and adversary simulation.
• Emulate real-world threats to gain access to enterprise networks.
• Identify and exploit vulnerabilities in various environments.

Skills

Offensive Security experience

Penetration Testing

Red Team Assessments

Social Engineering

Leadership

Education

Undergraduate or Master's degree in Information Systems Security, Computer Science, or related fields

Tools

Kali/Parrot

Bloodhound

nmap

BurpSuite

Job description

Cybersecurity - Threat Management, Detection, & Response (Penetration Tester) - Senior Consultant

Location: Toronto

Other locations: Primary Location Only

Date: Sep 29, 2025

Requisition ID: 1648472

At EY, we’re all in to shape your future with confidence.

We’ll help you succeed in a globally connected powerhouse of diverse teams and take your career wherever you want it to go.

Join EY and help to build a better working world.

EY's people in more than 150 countries are committed to operating with integrity, quality and professionalism in the provision of audit, tax, transaction and advisory services. We strive to help all our people achieve their professional and personal goals through an inclusive environment that values everyone's contributions, appreciates diversity of thought, fosters growth, and provides continuous opportunities for development. Recognized as one of Canada's top employers, EY continually strives to be a great place to work.

The Opportunity

With rapidly changing cybersecurity threats, clients from all industries look to us for trusted solutions for their increasingly complex risks. EY’s Offensive Security team is a highly skilled technical team dedicated to replicating the tactic, techniques and procedures used by new and emerging threat actors while utilizing them to provide quality insights to client engagements. The team places a strong emphasis on continuous learning and personal growth for each member in an ever-evolving industry.

We are actively seeking an experienced/advanced Senior Penetration Tester to join our Offensive Security team. You’ll work and collaborate with a highly skilled technical team of likeminded individuals dedicated to performing offensive security operations, ranging from infrastructure penetration testing, web application security assessments, and full-scope red team assessments with a focus on covertly obtaining and maintaining access to enterprise networks. As a member, you\'ll develop, deliver, and lead cybersecurity client engagements as well as internal development projects.

Your Key Responsibilities

As an experienced Senior Penetration Tester your primary focus will be performing offensive security engagements including, but not limited to, penetration testing (Infrastructure and Application), Red Team assessments, Social Engineering assessments, and Adversary Simulation. The focus of these assessments will be to emulate various real-world threats and threat actors attempting to gain access to enterprise networks and achieve a set of defined objectives, such as obtaining domain admin privileges, gaining access to sensitive information, or simulating a ransomware attack. You will be responsible for remaining up to date on current threat intelligence and threat actor groups, along with their techniques/tools, to replicate during client engagements.

Additional responsibilities include identifying and exploiting vulnerabilities in enterprise networks, application, and cloud environments using both off-the-shelf and in-house built tools, including both automated and manual approaches. Development of custom exploits to bypass security measures in place or exploit vulnerabilities where proof-of-concept/public exploits may not be available. Development of detailed reports and presentations for various clients across many industries for both executive and technical audiences.

Client Responsibilities

• Demonstrate in-depth technical capabilities and professional knowledge with the ability to assimilate new knowledge quickly and in fast paced environments.
• Demonstrate and apply a thorough understanding of complex information systems.
• Use knowledge of current cybersecurity industry trends to identify new exploits, attack vectors, and vulnerabilities, and communicate this information to the engagement team and client management through written correspondence and verbal presentations.
• Lead client calls and discussions with both the executives and technical team members with a demonstrated ability to communicate technical observations concisely to executive leadership while effectively describing the risk impact to the organization.

People Responsibilities

• Contribute to people-related initiatives, including development, coaching, recruiting, training, and retaining staff.
• Maintain an educational program to continually develop the personal skills of yourself and other operators.
• Understand and follow workplace policies and procedures.

Skills and Attributes for Success

Desired qualifications include:

• Undergraduate or masters’ degree preferably in one of the following areas: Information Systems Security, Computer Science, Computer Engineering, or other related majors.
• 5+ years of recent offensive security experience (internal, external, and application penetration testing, red teaming, adversary simulations, social engineering, etc.).
• Extensive and proven practical experience conducting penetration tests and red team assessments.
• Possession of certifications such as OSCP/OSCP+, OSWE, OSEP, OSED, OSEE, etc.
• Experience in working independently or as part of a large team to deliver offensive security services as standalone deliverables or within large, complex projects.
• Experience writing and analyzing complex code related to exploit development and analysis.
• Expertise in developing malware and custom tooling that remains undetected by enterprise endpoint protections.
• Experience with performing manual and automated OSINT collection and organizing findings
• Strong knowledge of modern offensive security tools and frameworks, such as Kali/Parrot (or other Linux distributions) and their associated toolkits, Bloodhound, nmap, BurpSuite, Impacket,
• Familiarity with all stages in the MITRE ATT&CK Framework.
• Excellent interpersonal, written, verbal, communication, and presentation skills.
• Excellent analytical skills and knowledge of data analytics methods.
• Demonstrated leadership abilities.

What We Look For

In addition to the above skills and attributes, we’re interested in intellectually curious people with a genuine passion for cybersecurity. If you have the confidence in your technical abilities to grow into a leading expert here, this is the role for you.

Inclusiveness at EY

Diversity and inclusiveness are at the heart of who we are and how we work. We’re committed to fostering an environment where differences are valued, policies and practices are equitable, and our people feel a sense of belonging. We embrace diversity and are committed to combating systemic racism, advancing gender equity and women in leadership, advocating for the 2SLGBTQIA+ community, promoting our neuroinclusion and accessibility initiatives, and are dedicated to amplifying the voices of Indigenous peoples (First Nations, Inuit, and Métis) nationally as we strive towards reconciliation. Our diverse experiences, abilities, backgrounds, and perspectives make our people unique and help guide us. Because when people feel free to be their authentic selves at work, they bring their best and are empowered to build a better working world.

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