At a Glance
- Tasks: Build and secure mobile applications with cutting-edge technology and hands-on coding.
- Company: Join a leading mobile identity and security company with a focus on innovation.
- Benefits: Fully remote role with competitive salary and opportunities for professional growth.
- Other info: Dynamic team environment with a focus on rapid development and real-world challenges.
- Why this job: Make a real impact in mobile security while working with AI and advanced tech.
- Qualifications: Strong software engineering skills, especially in mobile SDK development and applied cryptography.
The predicted salary is between 59400 - 72600 £ per year.
This is a fully remote role, but the individual needs to be located in London or Spain. Our client is a mobile identity and security company whose platform protects high-assurance apps from attack while they run — on devices the company doesn't control. They're hiring a hands-on Product Security Engineer to help build out their mobile application security (RASP) platform. This is a genuine builder role, not a policy or governance one. You'll write production code across mobile and backend, working at high velocity with AI as your primary development accelerator.
What you'll be building:
- You'll ship the in-house shields that defeat rooting/jailbreaking, hooking and instrumentation, emulators, tampering and repackaging, malware, and network interception (MITM, SSL-pinning bypass, malicious VPN/proxy) — built on top of a licensed RASP core.
- You'll own the applied cryptography behind secure local storage and app/device attestation, plus the iOS symbol-obfuscation and binary-hardening tooling that closes native reverse-engineering gaps across Swift, C, C++ and Objective-C.
- The product spans both sides of the wire, so you'll also build and operate the platform's Python (Flask) backend — the APIs and services that ingest threat telemetry, drive the operator console, manage configuration and policy, and forward events to SIEM.
- Because you're building the product, you'll also run hands-on competitive evaluations (against the likes of Promon, Appdome, Guardsquare, Zimperium and Build38) and support the Sales & Solutioning team as a technical pre-sales engineer when needed.
What we're looking for:
- Strong, current, hands-on software engineering — you code daily and ship to production.
- Mobile SDK development in iOS (Swift/Obj-C) and/or Android (Kotlin/Java), ideally security- or SDK-focused.
- Experience integrating and extending third-party SDKs via callback/event APIs.
- Code-hardening experience — obfuscation and binary hardening across native mobile toolchains.
- Applied cryptography fundamentals (secure data-at-rest storage, attestation).
- Backend development in Python (Flask), with solid testing and API-design discipline.
- Proven experience building and shipping quickly with AI coding tools (Claude Code, Copilot, Cursor, or similar).
- Practical CI/CD experience (GitHub Actions, GitLab CI or Jenkins) and solid AWS, Git and Docker fundamentals.
- Familiarity with RASP/MTD, OWASP MASVS/MASTG, and the mobile attacker toolkit (Frida, Xposed, Magisk, emulators).
Strongly preferred:
- Spanish (spoken and written), given the company's Spanish-speaking European and LATAM customer and supplier base.
- Experience or interest in fraud management (behavioural biometrics, transaction risk scoring, device intelligence) and EU regulatory frameworks (PSD2 SCA, DORA, GDPR, PCI-DSS, eIDAS 2.0) is a plus, as is a background in a security vendor or fintech/banking environment.
Location: Fully remote, based in Spain or London.
Senior Product Security Engineer employer: Socium - Teams Done Differently
Join a pioneering team at the forefront of technology within a historic sporting brand, where your contributions as a Frontend Developer will directly shape innovative products. With a strong emphasis on collaboration and a culture that values creativity, you'll enjoy opportunities for professional growth while working in a dynamic environment that balances remote flexibility with essential in-person teamwork in Reading. This is not just a job; it's a chance to be part of a legacy while driving technological advancements in an exciting new chapter.
Contact Details:
Socium - Teams Done Differently Recruitment Team
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We think this is how you could land Senior Product Security Engineer
✨Join Local Tech Meetups
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✨Contribute to Open Source Projects
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We think you need these skills to ace Senior Product Security Engineer
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at Socium - Teams Done Differently.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Socium - Teams Done Differently and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at Socium - Teams Done Differently
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If Socium - Teams Done Differently uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
