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

Zero to One search; Deutschland; Hybrid; EUR 70.000 - 90.000; Teilzeit

Zusammenfassung

A leading technology company is seeking a Rust Software Engineer to enhance their decentralized digital identity solutions. This role involves building secure and high-performance systems, collaborating with global teams, and requires expertise in Rust along with performance optimization skills. The position can be based in Berlin or remote, and is a 3-month freelance contract. Candidates should also have knowledge in TypeScript, cloud computing, and experience with distributed systems, ensuring strong communication and documentation skills.

Qualifikationen

• Proven experience with performance optimization and system bottleneck prevention.
• Strong backend development skills with Rust as a core expertise.
• Experience in cloud computing (AWS) and designing distributed systems.

Aufgaben

• Build and deliver secure, high-quality features and improvements using Rust.
• Collaborate closely with product, security, and engineering peers.
• Design and implement solutions to complex, large-scale technical challenges.

Kenntnisse

Rust

Performance optimization

TypeScript

Dart

Cloud computing (AWS)

Distributed systems

Technical documentation

Asynchronous cryptography

Jobbeschreibung

Job Description

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 complex, 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 / Node.js; 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.