In today’s rapidly evolving digital landscape, mobile security has become a cornerstone of trust in financial technology—especially within the cryptocurrency ecosystem. As one of the world’s leading crypto exchanges, OKX is at the forefront of innovation, serving over 20 million users across 180+ regions. With a mission to democratize financial access through blockchain and decentralized finance (DeFi), OKX is actively seeking a highly skilled Mobile Engineer, Security to strengthen the integrity and resilience of its flagship mobile application.
This role is not just about coding—it's about defending millions of users from sophisticated cyber threats while shaping the future of secure digital asset management.
Why OKX Stands Out in Crypto Innovation
Founded in 2017, OKX has consistently pushed the boundaries of what’s possible in cryptocurrency trading and financial infrastructure. From advanced spot and derivatives trading to integrated wallet services and DeFi solutions, OKX delivers a comprehensive, user-centric platform built on security, scalability, and innovation.
At the heart of this ecosystem lies the OKX mobile app, a mission-critical product used by millions daily for trading, asset management, and secure wallet operations. Ensuring its robustness against emerging threats is paramount—and that’s where you come in.
👉 Discover how top-tier crypto platforms are redefining mobile security with cutting-edge engineering.
The Role: Mobile Security Engineer at OKX
As a Mobile Engineer, Security, you’ll play a pivotal role in safeguarding one of the most widely used crypto applications in the world. You’ll work cross-functionally with product, design, and engineering teams to identify vulnerabilities, implement advanced protection mechanisms, and ship high-impact security features through rapid iterations.
This is a hands-on technical position that demands deep expertise in mobile platform security, reverse engineering, and real-time threat mitigation.
Key Responsibilities
- Reverse engineer OKX applications to identify defense weaknesses and improve overall app security posture.
Develop and maintain mobile application security products, including:
- App shielding
- DEX reinforcement
- String obfuscation
- Anti-tampering and anti-debugging systems
- Data encryption protocols
- Research and apply the latest mobile attack and defense techniques to both Android and iOS platforms.
- Build internal security scanning platforms and vulnerability metric tools to support privacy compliance and proactive risk detection.
- Lead risk mitigation efforts and provide technical guidance to business units facing security challenges.
- Monitor, analyze, and resolve user-reported security issues with speed and precision.
Who You Are: Core Requirements
To thrive in this role, you must bring a strong foundation in mobile security combined with practical development experience.
- Bachelor’s or Master’s degree in Computer Science or a related field.
- 5+ years of professional experience in mobile security with strong coding proficiency.
Mastery of at least two programming languages such as:
- Java / Kotlin (Android)
- Objective-C / Swift (iOS)
- C/C++ for native layer development
- Python for automation and analysis
Proven skills in reverse engineering on Android or iOS, including bypassing:
- Code obfuscation
- Anti-debugging techniques
- Jailbreak/root detection
- Hands-on experience with hooking frameworks like Xposed and Frida for dynamic analysis.
- Demonstrated ability to develop proof-of-concept (PoC) applications to test vulnerabilities.
- Excellent problem-solving skills, communication abilities, and a collaborative mindset.
Preferred Qualifications (Nice-to-Have)
While not required, these experiences will give candidates a significant edge:
- Prior work on mobile security SDKs serving 10M+ daily active users.
- Involvement in large-scale risk control projects, particularly in threat intelligence or combating black/gray market activities.
- Deep reverse engineering experience with first-tier commercial apps.
- Multi-platform expertise (Android & iOS) with a focus on cross-platform attack vectors.
- Proficiency in ARM assembly language for low-level analysis and countermeasures.
- Experience in device fingerprinting, including simulating new devices via flashing, modification, or app cloning.
Building Trust Through Technical Excellence
Security isn’t just a feature—it’s the foundation of user trust. Every line of code you write helps protect real people’s assets from increasingly sophisticated threats. Whether it’s preventing session hijacking, blocking runtime manipulation, or hardening the app against static analysis, your work directly impacts millions.
You’ll be part of a global team committed to staying ahead of attackers by anticipating threats before they emerge. This means continuous learning, proactive research, and deploying defenses that evolve as fast as the attack surface does.
👉 See how elite engineering teams are securing next-gen crypto platforms against modern threats.
FAQs: Mobile Security Engineer at OKX
Q: What does a typical day look like for a Mobile Security Engineer at OKX?
A: Your day might include analyzing new reverse engineering attempts on the app, developing anti-tampering logic, reviewing third-party SDK risks, testing protections using Frida hooks, or collaborating with developers to integrate security patches—all while monitoring live threat feeds.
Q: Is this role focused only on Android or iOS?
A: The role supports both platforms. While specialization in one is acceptable, familiarity with both ecosystems—and their unique security models—is highly valued.
Q: How does OKX handle zero-day vulnerabilities in mobile apps?
A: We operate under a proactive security model—using automated scanning, red team exercises, bounty programs, and real-time monitoring to detect and patch vulnerabilities quickly, often before exploitation occurs.
Q: Can this role be remote?
A: While based in Singapore, OKX supports flexible work arrangements depending on team needs and individual performance. On-site collaboration is encouraged for critical projects.
Q: What career growth opportunities exist for security engineers?
A: Engineers can grow into senior technical roles (e.g., Principal Security Engineer), lead security initiatives across products, or transition into architecture or threat intelligence leadership.
Q: Does OKX offer training in blockchain-specific security?
A: Yes—OKX invests heavily in employee development through internal workshops, external certifications (e.g., OSCP, CISSP), and access to cutting-edge research in blockchain security.
Perks & Benefits
OKX believes in empowering its people to reach their full potential:
- Competitive total compensation package aligned with global tech standards.
- Comprehensive Learning & Development (L&D) programs, including education subsidies.
- Regular team-building events and company-wide gatherings.
- A dynamic, inclusive culture driven by innovation and ownership.
👉 Join a global crypto leader where your code protects millions—start your journey today.
Keywords Integrated:
- Mobile Security Engineer
- Cryptocurrency App Security
- Reverse Engineering
- Anti-Tampering Technology
- App Shielding
- Mobile Threat Defense
- Blockchain Security
- Android & iOS Security
By combining technical depth with real-world impact, this role offers a rare opportunity to shape the future of secure digital finance. If you’re passionate about protecting decentralized ecosystems and thrive in high-stakes environments, OKX is where your expertise belongs.