Job Description

OKX will be prioritising applicants who have a current right to work in Singapore, and do not require OKX's sponsorship of a visa.

Who We Are

At OKX, we believe that the future will be reshaped by crypto, and ultimately contribute to every individual's freedom.

OKX is a leading crypto exchange, and the developer of OKX Wallet, giving millions access to crypto trading and decentralized crypto applications (dApps). OKX is also a trusted brand by hundreds of large institutions seeking access to crypto markets. We are safe and reliable, backed by our Proof of Reserves.

Across our multiple offices globally, we are united by our core principles: We Before Me, Do the Right Thing, and Get Things Done. These shared values drive our culture, shape our processes, and foster a friendly, rewarding, and diverse environment for every OK-er.

OKX is part of OKG, a group that brings the value of Blockchain to users around the world, through our leading products OKX, OKX Wallet, OKLink and more.

About The Opportunity

We are looking for a Staff Mobile Security Engineer to join our Mobile Security team, where you will play a key role in identifying and mitigating security vulnerabilities across OKX's mobile applications and platforms. This is a high-ownership role at the intersection of offensive security, mobile engineering, and platform protection — you will work closely with development, operations, and compliance teams to ensure security is embedded at every layer of our mobile stack.

You bring deep expertise in mobile application security, offensive techniques, and secure coding practices. You are also fluent in AI-assisted development and bring the discipline to build, maintain, and continuously improve your own AI engineering workflows.

What You'll Be Doing

Identify and address security vulnerabilities in mobile code, systems, and networks through manual review, automated tooling, and threat modelling.
Manage and optimise application security tools, processes, and alerts to maintain a strong security posture.
Validate and respond to Bug Bounty submissions, triaging findings and coordinating remediation with engineering teams.
Produce detailed security findings reports and present them to both technical and management audiences, contributing to real-world attack prevention.
Collaborate with development teams to implement and champion secure coding practices across iOS and Android platforms.
Apply AI tools to accelerate security research, automate vulnerability detection workflows, and improve the efficiency of threat analysis.
Work alongside operations and compliance teams to ensure security is a consistent priority across the organisation.
Participate in incident response and management activities.
Stay current on the latest offensive security techniques, application security threats, and industry best practices.

What We Look For In You

5+ years of experience in mobile application security or offensive security, with hands-on expertise in iOS and/or Android platforms.
In-depth understanding of security risks, vulnerabilities, and concepts in mobile and web applications.
Proficient in code review across Kotlin, Swift, TypeScript, or JavaScript, with a strong grasp of application security threats.
Able to create proof-of-concepts (PoCs) to demonstrate vulnerabilities, review patch code for adherence to standards, and collaborate with repository owners on remediation.
Actively uses AI tools in your security engineering workflow — including building AI-leveraged workflows and codifying repeatable agent skills so tools like Claude Code or Codex deliver reliably on real production work.
Strong analytical and problem-solving abilities with excellent verbal and written communication skills.

Nice-To-Haves

Prior experience developing mobile security SDKs at scale — products with a daily active user base of over ten million.
Experience in large-scale business risk control projects, or practical experience in threat intelligence, business risk prevention, and countermeasures against black and grey industries.
In-depth reverse engineering of major apps from first-tier vendors, or other projects that demonstrate strong reverse engineering capabilities.
Proficiency in ARM assembly, with the ability to implement deep-level countermeasures at the native and application layers.
Experience with device fingerprint recognition — including simulating new devices through methods such as flashing, modification, and application cloning.
Ability to work across multiple mobile platforms simultaneously.

Perks & Benefits

Competitive total compensation package
L&D programs and Education subsidy for employees' growth and development
Various team building programs and company events
Wellness and meal allowances
Comprehensive healthcare schemes for employees and dependants
More that we love to tell you along the process!

Notice:

All official OKX vacancies are published on this website. While roles may appear on selected third-party platforms from time to time, information on other sites may be inaccurate or outdated. If in doubt, please apply directly through our official careers website.

Information collected and processed as part of the recruitment process of any job application you choose to submit is subject to OKX's Candidate Privacy Notice

About OKX

At OKX, we believe that the future will be reshaped by Crypto, ultimately contributing to every individual's freedom.

OKX began as a crypto exchange giving millions of people access to crypto trading and over time becoming among the largest platforms in the world. In recent years, we have developed one of the most connected Web3 wallets used by millions to access decentralized crypto applications (dApps).

OKX is a trusted brand by hundreds of large institutions seeking access to crypto markets on a reliable platform that seamlessly connects with global banking and payments. In the last year, OKX has expanded into new markets including Australia, Brazil, Netherlands, Singapore and Turkey, with plans to launch in the US, Belgium and the UAE.

We are deeply committed to shaping a fairer, more transparent and accessible society through blockchain technology. This is why we publish proof of reserves monthly, and continue to ship new innovative security features.

We believe in good sportmanship and the pursuit to be better. You may see our OKX logo neatly fitted on the McLaren F1 cars, Manchester City FC team shirts, or at the Tribeca Film Festival celebrating artists and creators. Wherever you may find us, you will notice our pursuit of making our world more efficient, transparent, and connected.

To learn more about OKX, download our app or visit: www.okx.com

UK users follow: https://www.linkedin.com/company/okxuk/

Learn more about working at OKG, the business group developing OKX, our Digital Assets Exchange, our Web3 portal and blockchain ecosystems: bit.ly/WorkingatOKG

Industry

IT & Software

Company Size

5,001-10,000 employees

Headquarters

Everywhere

Year Founded

Unknown

Website

okx.com

Social Media

Staff Software Engineer, Mobile Security