Okx1mo ago

Expert Application Security Engineer (iOS)

Singapore · Hong Kong Sar · Singapore / Hong Kongmid

SecurityApplication Security EngineerCybersecurity

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Quick Summary

Key Responsibilities

Identify and address security vulnerabilities in code, systems, and networks using manual review, automated tools, and threat modeling. Manage and optimize application security tools, processes,

Requirements Summary

3+ years of experience in offensive security techniques. In-depth understanding of security risks, vulnerabilities, and concepts in web and mobile applications. Proficient in code review,

Technical Tools

SecurityApplication Security EngineerCybersecurity

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.

Responsibilities:

Identify and address security vulnerabilities in code, systems, and networks using manual review, automated tools, and threat modeling.
Manage and optimize application security tools, processes, and alerts.
Validate and respond to Bug Bounty submissions.
Stay informed on the latest offensive security techniques, application security threats, and best practices, and suggest improvements to enhance our security posture.
Produce detailed reports of your findings, present them to both management and technical teams, and contribute to preventing real-world attacks.
Collaborate with development teams to implement secure coding practices.
Work alongside other teams, including operations and compliance, to ensure that security is a consistent priority across the organization.
Participate in incident response and management activities.

Qualifications:

3+ years of experience in offensive security techniques.
In-depth understanding of security risks, vulnerabilities, and concepts in web and mobile applications.
Proficient in code review, particularly with Kotlin/Swift/Typescript/JavaScript, with a strong grasp of application security threats.
Ability to create proof-of-concepts (PoCs) to demonstrate vulnerabilities, review patch code for adherence to standards, and collaborate with repository owners and maintainers.
Strong analytical and problem-solving abilities.
Excellent verbal and written communication skills.

Nice-to-have:

Prior experience in developing mobile security SDKs with a daily active user base of over ten million is preferred.
Participated in large-scale business risk control projects, or have practical experience in threat intelligence/business risk prevention, and analysis/countermeasures against black and gray industries.
In-depth reverse engineering of major apps from first-tier vendors, or other experiences/projects that demonstrate reverse engineering capabilities.
Priority given to candidates who can simultaneously master relevant technologies on multiple platforms.
Proficient in ARM assembly, capable of deep-level countermeasures at the native and application layers.
Have certain capabilities in device fingerprint recognition, able to simulate new devices through methods such as flashing, modification, and application cloning.

Perks & Benefits:

Competitive total compensation package
L&D programs and Education subsidy for employees' growth and development
Various team building programs and company events
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.

Listing Details

Posted: March 16, 2026
First seen: March 26, 2026
Last seen: April 22, 2026

Posting Health

Days active: 26
Repost count: 0
Trust Level: 31%
Scored at: April 22, 2026

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Okx

greenhouse

OKX is a global cryptocurrency exchange and Web3 technology company, offering trading, wallet services, and access to decentralized finance. Founded in 2017, it serves millions of users in over 100 countries.

Employees

5k+

Founded

2017

Domain

Jobs

External application · ~5 min on Okx's site

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