Application Security Engineer | Mid-Senior | iOS

At Nord Security, we’re creating a safer cyber future.

We help people and businesses take back control of their online security, privacy, and data. From VPNs to password managers, threat intelligence to eSIMs for travel—our teams turn complex problems into solutions trusted by millions worldwide.

Life is online. In this role, you’ll help people own it.

Main Responsibilities

• Conduct security reviews of application designs, source code, and third-party libraries/SDKs;
• Perform regular application vulnerability assessments using both automated tools and manual testing techniques (e.g., SAST, DAST, SCA, penetration testing);
• Perform end-to-end security assessments of iOS applications, covering static and dynamic analysis, runtime instrumentation
• Collaborate with development teams to design secure architectures and implement security controls;
• Help maintain security tools, scripts, and processes to support secure development;
• Stay current with industry trends, zero-day vulnerabilities, platform security changes in new iOS releases, and best practices in application security;
• Develop scripts, security automation tools and instrumentation harnesses to enhance mobile application security testing processes;
• Design and deliver training for security engineering awareness & adoption;
• Actively look for internal security gaps within our products
• Ensure mobile applications are sufficiently tested and support internal and external audits, including MASVS-aligned assessments.

Core Requirements

• Proven experience in mobile application security assessment planning, testing, methodologies, and vulnerability reporting, with a focus on iOS;
• Strong understanding of secure coding practices;
• Ability to perform manual security code audit;
• Proficiency in at least one mobile/native programming language (Swift, Objective-C), and comfort reading C/C++ where it appears in dependencies;
• Practical knowledge of the OWASP MASVS and MASTG, and the ability to plan and execute assessments against them;
• Solid understanding of the iOS security model: sandboxing, entitlements, code signing, Keychain, Data Protection classes, App Transport Security, IPC and inter-app communication (URL schemes, universal links, app extensions, app groups);
• Hands-on experience with dynamic instrumentation and mobile testing tooling such as Frida, Objection, MobSF, Burp Suite, mitmproxy and class-dump/otool-style binary inspection;
• Experience bypassing client-side controls such as certificate pinning, jailbreak detection and anti-tampering, and assessing their resilience;
• Solid understanding of networking protocols such as TCP, UDP and the HTTP protocol, including TLS and traffic interception on mobile devices;
• Understanding of insecure data storage, sensitive data leakage (logs, backups, snapshots, pasteboard, caches) and cryptographic misuse in mobile apps;
• Ability to work with networking tools such as Wireshark, tcpdump;
• Familiarity with iOS reverse engineering and debugging tooling (e.g. Ghidra, IDA, Hopper, LLDB);
• Ability to quickly assimilate new technologies and tools;
• Sense of ownership with strong problem solving and investigation skills;
• Ability to build and maintain relationships, influence key stakeholders across the business;
• Bonus points for community contributions like public CVEs, bug bounty recognition, open-source tools, blogs, etc.

Nice to have

• Familiarity with Android application security, to allow cross-platform coverage;
• Familiarity with fuzzing tools and fuzzing techniques.