Senior/Staff Android SDK Engineer
External
Expressvpn · GermanyFull-timeOn-site3w ago
AndroidAPI DesignCI/CDDocumentationEncryptionExcel
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About the role
We're building a next-generation VPN platform that allows enterprises to seamlessly embed secure connectivity into their own apps. As a Senior/Staff Android SDK Engineer, you will own the development of Android SDK layers - the platform-specific code that powers VPN integrations for our own apps and enterprise partners. This role is deeply focused on SDK and systems-level mobile engineering . You'll work on networking, performance, and platform abstractions that enable reliable, secure VPN experiences at scale.
Responsibilities
- Implement and maintain the Android SDK layer using Kotlin and VpnService API
- Collaborate closely with core SDK engineers to ensure consistent, clean API design across platforms
- Build abstractions that simplify VPN integration for external developers
- Optimize SDK performance for latency, connection stability, and battery efficiency
- Handle connection lifecycle management, error handling, and edge cases across devices and OS versions
- Contribute to SDK architecture, modularity, and extensibility
- Build and maintain demo integration applications
- Lead AI-assisted development with Claude Code . Designing prompts and workflows, orchestrating sub-agents, reviewing and validating generated output, and shaping how the team uses AI to ship faster without sacrificing quality
- Define and own observability, reliability, and security standards (Analytics, structured logging, alerting)
- Establish and uphold high engineering standards through code reviews, testing practices, and clear documentation
- Support enterprise clients for integration and platform-specific issues
- We approach engineering through the following principles: Testing by default, always CI/CD, data and automation-centered, with security at the core. We empower our engineers to make their own decisions about the tools and technologies that best address the problems they are trying to solve.
Requirements
- Proven expertise in Android (Kotlin, VpnService) & understanding of the Android networking stack
- Experience designing clean, stable, developer-friendly SDK APIs - you think about the integration experience, not just the implementation
- Comfort working beyond the Android ecosystem - for example iOS, cross platform technologies, Rust - transferable cross-stack experience is what matters most
- A modern view on AI-assisted engineering. Experience orchestrating, guiding, and supervising AI agents (Claude Code or similar) to deliver production-grade systems is highly important to us .
- Solid understanding in software design principles and architectures
- Strong problem-solving and debugging skills
- Excellent communication skills, equally comfortable in deep technical reviews and in front of enterprise customers
- High degree of ownership and the ability to operate independently with minimal direction
- Experience in mobile SDK / library development
- Experience with VPN technologies, authentication systems or secure networking
- Experience in the iOS ecosystem or cross-platform mobile technologies
- Experience working on B2B / white-label platforms
- Knowledge of mobile security best practices (encryption, secure storage, certificate pinning)
Benefits
Work with a modern tech stack in a strong engineering cultureInfluence on technical decisions and room to innovateContinuous learning opportunities and support for professional developmentA motivated, collaborative team with flat hierarchiesA strategic role with real technical influence and ownershipA modern engineering culture with CI/CD, observability, and a strong code review culturePurpose-driven work: we value security, quality, and depth over quick hacksHow we'll support youWe prioritize treating every team member with respect and promote open and constructive feedback, ensuring a culture of trust and transparencyWe encourage learning through experimentation and provide a safe space for everyone to learn from their experiencesOur managers are dedicated to facilitating career growth and creating an environment that attracts and supports talented engineers
Additional Information
Location: Germany
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