Senior Security Engineer (Product Security)

Immutable is the world's fastest-growing game platform, built to power the next generation of games. Immutable's full-stack product suite powers every stage of game creation and growth from infrastructure to player engagement. 

Founded in 2018, we're one of the fastest Australian companies to reach unicorn status, raising more than AUD $400M+ at a valuation of AUD $3.5B. Today more than 700 games build on Immutable, and industry leaders like Ubisoft have chosen us as their partner for the future of gaming. Immutable Audience, our newest product line, is the fastest-growing SaaS in our history.

We're growing faster than we ever have, and we're hiring the talent who'll take it further 🚀

Immutable builds products for game studios. One side of the business is a marketing data platform that helps studios find and keep players. The other is blockchain infrastructure, including our own Ethereum layer-2 network and Passport, a wallet players use to hold real digital assets. For a security engineer, this means a wide spread of work across web apps and APIs, AWS and GCP, and smart contracts where a bug has a dollar value attached.

You’ll join a security team of five and report to our Head of Security. Most of your time will be spent with the product engineering teams, reviewing new services, building threat models with them and fixing issues in their code. Our target is to fix 80% of vulnerabilities before they reach production, and this role is central to hitting it.

• Own, our vulnerability management program, including the Bugcrowd and Immunefi bug bounties and findings from our scanning tools, with a goal of 90%+ SLA compliance on critical and high issues
• Own the AI agents that review pull requests for security issues and triage incoming bugs
• A security context layer (threat models, asset inventory, past findings) that lets those agents triage and propose fixes with less human input
• Keeping our threat models and attack graphs current as the product changes

📊 Sharing our products' success through Employee Stock Options ESOP

🌟 Our flexible working model blends the best of both worlds: Sydney-based employees enjoy hybrid 3 days a week in our vibrant head office, while remote team members can work from home or utilise access to global office hubs via a WeWork All-Access pass

🥘 Lunch is ordered fresh every day in our friendly office in Sydney CBD

🎉 Quarterly End of Cycle Celebration Awards 

💻 USD $500 WFH allowance to set up your home office

☎️ USD $600 per annum to put toward your internet and phone usage.

🥳 USD $75 per quarter for remote employees to celebrate with local team members 

⛑️ We also support our US Employees with Medical and 401K Insurance

🚘 Our Australian Employees can access Novated Leasing and save money by paying fort their car using pre & post-tax dollars

🌱 We offer up to USD $1,350 per annum for classes, courses, AI tooling or events to support your growth and development

📚 Enjoy access to free online courses via Udemy

💆🏽‍♀️ Enjoy USD $800 per year to put toward your health and wellbeing

🤗 Get 24/7 access to unlimited counselling for you and your family when you need it through our EAP Service

🎁 Monthly subsidy and discounted rate with ClassPass, including a 1-year free membership to Breethe

👨‍👧‍👦 Paid parental leave

🌟 Enjoy 2 additional paid annual leave days at the end of the year

🎂 Enjoy a paid day off on your birthday 

Immutable is committed to building and fostering an inclusive, diverse workplace. We believe in incorporating everyone's perspectives and experiences as this has been a significant driver of our success so far.

We are a 2026 Circle Back Initiative Employer. This means a human reviews every application and we commit to responding to every applicant.

*A note to recruitment agencies: Our internal team has this role covered, so there is no need to reach out - We don't accept unsolicited agency resumes and are not responsible for any fees related to unsolicited resumes. Thank you!

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us