We’re looking for a **Senior Mobile Developer** to lead the development of **cross\-platform mobile client**, enabling secure access and Zero Trust connectivity from iOS and Android devices. You’ll be responsible for developing the core client used to establish secure connections, enforce policies, and manage authentication in our next generation **Enterprise VPN and Zero Trust** platform. This is a highly technical role requiring strong familiarity with native software programming, **networking**, and **secure software design**. Your work will directly impact how users connect to protected networks, access internal services. As a key member of the **founding team**, you’ll shape our **technical strategy**, **engineering practices**, and **system resilience**. Your decisions will influence both product direction and company growth. **Our philosophy is that we are a small, close\-knit team, and we care deeply about you:** * Competitive pay rates * Fully remote work environments * Self\-managed time off **Important:** * This will be **a permanent employment** opportunity for candidates based in **Spain, Germany and Poland**. **Your contribution will include:** * Develop and maintain robust, secure desktop applications for **iOS** and **Android** * Interface directly with low\-level OS APIs (i.e., Network Extension/VPN Service**)** * **Integrate authentication flows** (i.e. OAuth2, PKCE),and backend APIs * Implement features such as **credential management** and Always\-on\-VPN * Optimize app performance, responsiveness, and battery efficiency * Handle push notifications, offline states, and biometric access (Face ID, Touch ID) * Contribute to testing, code quality, release automation, and App Store / Play Store submission processes * Follow secure coding practices and protect against attack vectors **You’ll be a great fit if you have the following:** * 4\+ years of experience developing **native and hybrid mobile development** for iOS and Android**.** * Proficiency in at least two object\-oriented languages (i.e., **C\+\+, Java, Kotlin, Swift,** or **Objective\-C),** but also in hybrid development using **Typescript.** * Knowledge of **React Native**, **JavaScript** and **TypeScript** * Familiarity with platform SDKs and device\-level APIs (e.g., permissions, networking, secure storage) * Good understanding of **networking fundamentals**: TCP/IP, UDP, DNS, TLS/SSL, firewalls, DNS, etc. * Experience automating releases to **Google Play**, **Apple TestFlight**, and managing code signing workflows * Experience with using **AI productivity tools** (e.g., GitHub Copilot, Cursor, CodeWhisperer, OpenAI, etc.) **Bonus points for:** * Knowledge of **Golang** * Exposure to **zero\-trust networking** or **identity\-based access systems** * Prior work in **privacy\-first**, **networking\-heavy**, or **security\-sensitive** apps * Knowledge of biometric auth, VPN profiles, or mobile security compliance (i.e., MDM, sandboxing) * Experience in cybersecurity