Web Application Penetration Tester - Nullify

Black Nova Venture Capital; Sydney; On-site; AUD 120,000 - 180,000; Full time

Job summary

Nullify is seeking a hands-on security tester to perform deep, manual pentests on customer web applications in Sydney. You will go beyond automated scans to validate auth flows, business logic, and multi-step exploit chains, feeding results back into our detection system.

You will partner with customer security teams from scoping to reporting and continuously learn new frameworks and patterns to stay ahead of threats.

Qualifications

• Production web apps security experience across real-world environments.
• Experience analyzing auth flows and business logic for vulnerabilities.
• Ability to reproduce findings as repeatable techniques for automation.

Responsibilities

• Run deep, manual web app pentests for clients, beyond automated scans.
• Convert findings into reproducible techniques and feed them into detection systems.
• Collaborate with client security teams from scoping to reporting.
• Stay ahead of new frameworks, auth patterns, and vulnerability classes.

Skills

Penetration testing

OWASP Top 10

Manual web app testing

Security tooling

Tools

Custom tooling development

Job description

Nullify runs autonomous security work most teams can't staff for. This role is the human edge of that — validating what our agents find, going after what they can't, and feeding every technique back into the system so it gets sharper.

What You'll Do

• Run deep, manual web app pentests against customer surface area that automated scanning alone won't catch — auth flows, business logic, multi-step exploit chains.


• Turn novel findings into reproducible techniques that get encoded back into Nullify's detection and validation agents.


• Partner with customer security teams during engagements, from scoping through report-back.


• Keep pace with the frontier: new frameworks, new auth patterns, new classes of vulnerability.

What You Bring

• Real-world experience finding and exploiting vulnerabilities in production web applications — OWASP Top 10 and beyond.


• Comfort working close to the metal: reading application code, tracing requests, building custom tooling when off-the-shelf doesn't cut it.


• A bias toward proof over speculation — you validate before you report.


• Bonus: experience training or evaluating AI systems on security tasks.