Senior/Staff Rust Engineer (Backend) - White-label

Team: B2B White-Label VPN Platform

Location: Übach-Palenberg / Onsite

About the Role

As a Senior/Staff Rust Engineer, you’ll join a cross-functional team at a leading VPN provider trusted by millions worldwide. You’ll help build a next-generation white-label VPN platform, shaping the backend control plane and evolving our core SDK for enterprise integrations.

For us, Rust is not an experiment, but a strategic cornerstone technology for building robust, secure, and high-performance systems. In this role, you’ll not only help shape our technical transition to Rust, but also actively contribute to architecture decisions and long-term technology direction.

What you’ll Do:

• Design and build backend microservices powering the platform control plane: Tenant management (multi-tenant architecture); Entitlements; Authentication broker and identity flows

• Extend and maintain the Kape SDK core, ensuring performance, safety, and cross-platform compatibility

• Develop and operate REST/gRPC APIs for internal and external platform integrations

• Drive architectural decisions and select appropriate libraries/frameworks (e.g., Tokio, Actix) for scalability, observability, and performance

• Collaborate closely with DevOps, QA, and Architecture teams

• Conduct code reviews and ensure high code quality through automated testing

• Contribute to engineering best practices (testing, code quality, documentation)

What you’ll bring:

• Solid experience with Rust, including asynchronous programming (Tokio or async-std)

• Experience with microservice architecture and REST/gRPC APIs

• Proficient in Git and comfortable working with build tools and CI/CD pipelines

• Familiarity with system architecture, memory management, and low-level programming

• Proficiency in object-oriented principles within Rust (traits, generics, dyn vs impl)

• Strong understanding of lifetimes and the borrow checker

• Solid English communication skills, both written and spoken (team language)

Nice-to-have:

• Familiarity with UniFFI or cross-platform library design is a plus

• Familiarity with security topics (e.g., memory safety, sandboxing, secure coding practices)

• Knowledge of Web Assembly, embedded development, or blockchain technologies

• Experience working on multi-tenant (B2B SaaS) platforms

What We Offer:

• Work with a modern tech stack in a strong engineering culture

• Influence on technical decisions and room to innovate

• Continuous learning opportunities and support for professional development

• A motivated, collaborative team with flat hierarchies’

• A strategic role with real technical influence and ownership

• A modern engineering culture with CI/CD, observability, and a strong code review culture

• Purpose-driven work: we value security, quality, and depth over quick hacks

How we’ll support you

We believe in fostering an environment that empowers decision-making at all levels. Our culture is rooted in the inverted pyramid approach, where the engineers, who have a deep understanding of the product and the customers, are the ones who have the knowledge and the authority to make impactful decisions.

• We prioritize treating every team member with respect and promote open and constructive feedback, ensuring a culture of trust and transparency

• We encourage learning through experimentation and provide a safe space for everyone to learn from their experiences

• Our managers are dedicated to facilitating career growth and creating an environment that attracts and supports talented engineers

ExpressVPN, a Kape Technologies company, is an equal opportunity employer. We promote equal recruitment and employment opportunities, and do not discriminate based on gender identity and/or expression, age, race, color, disability, culture, religion or belief, family and/or marital status, sexual orientation, or other characteristics protected by applicable law. We celebrate a diverse and inclusive work environment in which applicants and employees are treated with respect and dignity, and excel based on personal merit, qualifications, experience, and performance.

Before you apply

• At the moment, we do not sponsor visas in the EU. For Hong Kong, we require at least two years of working experience and a university degree in a related field. For Singapore and the UK, we can only sponsor visas for mid-career or above.

• Please upload your resume as a PDF and do not include any salary or compensation information in it.

ExpressVPN is one of the world’s leading providers of online privacy and security services for consumers. Started in 2009, we’ve grown to have millions of active paying customers, a team of more than 700 people worldwide, and a brand recognized by hundreds of millions of people in 18 languages and more than a hundred countries. We see huge growth in our industry, and are gaining market share through strong execution.