Expert Security Engineer - Offensive Security

At Finastra, we’re a global leader in financial services software, dedicated to expanding access to financial services and shaping what’s next for the industry. Our technology powers mission‑critical solutions across Lending, Payments and Universal Banking, supporting over 7,000 customers, including 80% of the world’s top 50 banks, in more than 110 countries.

What will you contribute?
As an Expert Offensive Security Engineer within the Cyber Defense Team, you'll lead offensive security assessments that strengthen our defense capabilities. Working closely with the larger InfoSec team, detection engineers, and external engineering partners, you'll identify security weaknesses, validate detection mechanisms, and provide actionable recommendations to enhance our security posture. You'll collaborate with various architecture and engineering teams to continuously validate and improve our security controls and detection capabilities, with a strong focus on developing repeatable testing frameworks and metrics-driven security improvements.
Responsibilities & Deliverables:
You will be responsible for the following:
Lead offensive security assessments: conduct full-stack security assessments across our entire technology stack.
Drive detection engineering partnerships: collaborate with detection engineers through purple team exercises, attack simulations, and threat emulation to improve detection coverage.
Develop custom tools and frameworks: build and maintain security testing tools, frameworks, and automation scripts that enable repeatable testing and quantifiable security improvements.
Build security metrics: design and implement frameworks to measure security control effectiveness, detection coverage, and improvement over time through consistent testing methodologies.
Research and innovate: stay current with the latest attack techniques, tools, and methodologies while building out both offensive and defensive security improvements.
Mentor and collaborate: share knowledge across security teams and foster a culture of continuous security improvement.
Required Experience:

5+ years: professional experience in offensive security, with demonstrated experience in red team and purple team exercises, penetration testing, and detection engineering teamwork.
Development experience: proficiency in Python or other programming language for building security tooling and automation.
Security assessment expertise: performing full-stack security assessments of web and mobile applications, APIs, on-prem and cloud infrastructure, and backend systems..
Deep understanding: common attack techniques; exploit development; post-exploitation methodologies; security assessment frameworks (MITRE ATT&CK, PTES); and modern detection stack components (EDR, SIEM, XDR).
Knowledge: of networking, operating systems, security protocols, security concepts including reverse engineering, cloud security (AWS/Azure), container security, CI/CD pipeline security, API security, and security metrics development.

Certifications: such as OSCP, OSCE, GXPN, or equivalent practical experience.

Interpersonal skills: strong analytical and problem-solving abilities.

Excellent technical writing for detailed reports; ability to clearly communicate complex technical concepts; self-motivated with a passion for offensive security and detection engineering.

We are proud to offer a range of incentives to our employees worldwide. These benefits are available to everyone, regardless of grade, and reflect the values we stand for:

Flexibility: Enjoy unlimited vacation, subject to local regulations and business priorities. Benefit from hybrid working arrangements and inclusive policies such as paid time off for voting, bereavement, and sick leave.

Well‑being: Access confidential one‑to‑one support through our Employee Assistance Program, connect with our network of Wellbeing Champions and Gather Groups, and take part in monthly events and initiatives designed to help you thrive—inside and outside of work.

Health & Financial Security: Medical, life and disability insurance, retirement plans, lifestyle, and other benefits.*

Sustainability: Paid time off for volunteering and donation‑matching opportunities to support causes that matter to you.

Inclusion: Get involved in our inclusion communities, such as Count Me In, Culture@Finastra, Proud@Finastra, Disabilities@Finastra, and Women@Finastra—open to everyone who wants to participate and contribute.

Career Development: Access online learning and accredited courses through our Skills & Career Navigator tool.

Recognition: Take part in our global recognition program, Finastra Celebrates, and share your voice through regular employee surveys that help shape our culture and ways of working.

*Specific benefits may vary by location.

At Finastra, each individual is unique—bringing their own ideas, perspectives, cultural backgrounds, and experiences. We learn from one another, value what makes us different, and create an environment where everyone feels included, supported, and able to be their authentic selves.

Be unique. Be exceptional. Help us make a difference at Finastra.