Senior Security Engineer (Product Security)

Immutable; Sydney; Hybrid; AUD 180,000 - 270,000; Full time

Benefits offered by this job

Hybrid work model

Lunch provided

USD 500 WFH allowance

USD 600 internet/phone allowance

Novated leasing and car benefits

Udemy courses for growth

ClassPass membership

Job summary

Immutable is seeking a Security Engineer to join a five-person security team, reporting to the Head of Security. You will work closely with product engineering to model threats, review services, and fix vulnerabilities before production, targeting 80% remediation before release.

The role combines web apps, APIs, and blockchain components with a strong focus on automated tooling. The position offers a hybrid Sydney-based work model with remote options and global office access, plus a

Qualifications

• Proven experience in finding and fixing security vulnerabilities in production
• Strong ability to explain root causes of security issues and implement fixes
• Experience building and reviewing security tooling and automation

Responsibilities

• Own vulnerability management program including Bugcrowd and Immunefi and fix prioritization
• Own AI agents that review PRs for security issues and triage bugs
• Develop a security context layer to aid triage and automated fixes
• Maintain up-to-date threat models and attack graphs as product evolves

Skills

Application security depth

AWS security

GCP security

AI tooling experience

Threat modeling

Software engineering

Tools

Bugcrowd platform

Immunefi

Threat modelling tools

AWS

Job description

About Us:

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.

About The Role:

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.

You'll Be Empowered To :

• 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

We'd Love You To Bring :

• Application security depth. You can find a broken auth flow or an injection bug in code, explain why it happened and fix it properly. You’re also a capable software engineer who ships production code, whether that’s a fix in someone else’s service or a tool you built from scratch.
• You’ve built AI tooling yourself. It might be an agent, an automation or an internal tool, and you can tell us what worked, what didn’t and how you knew. Plenty of people use AI tools well. For this role we need someone who builds them.
• Solid AWS security experience will help a lot (IAM, network controls, secrets, misconfigurations). GCP, detection and response experience, and web3 knowledge are all useful, though none are deal-breakers. Side projects and open source work tell us a lot, so please include them.
• You’ll enjoy this if you like autonomy, work well beside engineers and are happy to help out in other parts of security when a small team needs it. It’s probably not a fit if you’d rather report findings than fix them.

Bonus Points For

• Web3 experience, such as wallet, smart contract or dApp security. You can learn it here, but it’ll help from day one.
• Deeper detection and response experience, or a real interest in growing into it
• Experience running a bug bounty program or findings pipeline end to end

We are proud of the benefits that we offer for all of our employees globally.

Here is a snapshot

Attracting the best global talent We commit to paying globally competitive base salaries and contributions to a long-term fund

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 for their car using pre & post-tax dollars

Levelling up your growth

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

Helping you thrive

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

Leave when you need it the most:

Paid parental leave

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

Enjoy a paid day off on your birthday

Additional Information:

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!

Join us in shaping the future of gaming!

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