Staff Rust Engineer (freelance contract, remote from the EU)

Our client is a technology company that builds decentralized digital identity solutions. They believe that everyone has the right to own and control their data and they are committed to creating a trusted digital credentials ecosystem that empowers businesses and individuals to securely exchange data and services across borders and industries.

They are in search of a solution-oriented Rust Software Engineer (Backend) with deep demonstrable expertise and experience in Rust to work on secure scalable and high-performance backend systems. You will be responsible for the continued enhancement and development of a multi-component platform where your expert skills in designing architecting and building quality systems will intersect with your hands-on coding performance testing and integration experience.

Location: Berlin (or remote)

A team is English-speaking

3-month freelance contract

Responsibilities

• Build and deliver secure high-quality features and improvements using Rust . Experience in TypeScript and Dart will set you above other applicants for this role
• Create standards-compliant world-class software systems and components most of which will be open-sourced.
• Influence architectural direction while staying hands-on with development
• Design and implement solutions to c omplex large-scale technical challenges
• Identify and drive the most critical improvements in product quality security and performance
• Guide the team to build well-tested secure and performant services
• Establish and refine best practices for high-scale distributed systems
• Collaborate closely with product security and engineering peers in a fast-paced iterative environment

Requirements

• Proven experience with performance optimization and a track record of diagnosing and preventing system bottlenecks
• Strong backend development skills with Rust as a core expertise
• Deep knowledge of TypeScript / ; Dart experience strongly preferred. Familiarity with C# or Go is a plus
• Expertise in cloud computing (AWS) and cloud-native environments
• Proven track record in designing and deploying distributed systems using modern design patterns
• Skilled in technical documentation (C4 Model ADRs) and clear communication of architectural decisions
• Strong advocate for privacy by design security-first principles and high-performance systems
• Expertise in applying asynchronous cryptography in production-grade products
• Experience with authorization / authentication domains; knowledge of identity verifiable credentials or secure data exchange is a strong plus
• Comfortable thriving in autonomous fast-moving startup environments and collaborating across global teams