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.

• 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.

• 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.

• Sharpen your edge Growth is built into how we work. Extensive online and in-person training programs, access to platforms like Coursera and Skillshare, a mentorship program, and internal career moves when you’re ready for something new — your development has no ceiling here.
• Take the time you need Rest isn’t a reward — it’s part of the deal. Enjoy extra vacation days that grow with your time here, plus additional days off for sick leave, special occasions, and parenting.
• Get premium healthcare Your health shouldn’t be something you worry about. We provide premium private health insurance so you have peace of mind and fast access to care whenever you need it. Available in Lithuania and Poland.
• Protect your peace A peaceful mind isn’t a luxury — it’s the foundation. We provide free subscriptions to top-rated Calm, Headspace, and Mindletic apps, offer resilience and mindfulness trainings, and run dedicated mental health events.
• Own your fitness Feeling good shapes how you work, think, and create. That’s why we offer in-house gyms, Multisport and Urban Sport cards, and online workouts. Need something tailored? Our Physical Well-Being experts are here with group mobility sessions, fitness guidance, and one-on-one consultations.
• Pack your bags for workation Picture this: the entire company flies out abroad. The days are packed with workshops, activities, concerts, and real time together. It’s legendary. If you’ve heard stories, they’re probably true.
• Work from anywhere New surroundings spark new thinking. When you need a reset, switch location and work from wherever keeps you sharp, creative, and in the zone.
• Celebrate your milestones The moments that make life special shouldn’t pass quietly. Birthdays, work anniversaries, weddings, new family members — each is marked with a special gift.
• Parent with ease When you’re a parent, the juggle is real. To make it smoother, we organize summer camps for the little ones and offer flexibility that lets you show up both for your family and your team.
• Join the party It never gets boring here. Get ready for team buildings that bring people closer, year-round company events that are equal parts educational and energizing, and the highlights everyone waits for — our iconic summer and winter celebrations.
• Unlock Cyber City Whether Vilnius-based or visiting from remote, our Vilnius HQ is fully yours to enjoy. Need focus? Silent room. Need energy? Open gyms. Need a break? Game room, music room, coffee bar. It’s a modern workspace built with your comfort in mind.