Senior Backend Engineer

About the opportunity

The company is developing infrastructure that helps digital asset systems adopt more resilient cryptographic standards while maintaining reliable user and developer workflows.

The engineering environment combines backend product development with applied cryptography and security research. The work includes production services, APIs, libraries, security controls and infrastructure designed for systems handling sensitive cryptographic operations.

This is a full-time permanent position within a growing Product Engineering team.

The role

You will take end-to-end ownership of security-critical backend services, primarily using Rust and TypeScript.

The role requires strong engineering judgement around secure system design, operational reliability, backward compatibility and auditability. You will work closely with cryptography and research engineers to translate new cryptographic approaches into robust production systems.

Key responsibilities

• Design, build and maintain production-grade backend services using Rust and TypeScript
• Own APIs and libraries with strict reliability and backward-compatibility requirements
• Develop systems that meet high standards for security, correctness and durability
• Implement secure approaches to signing, encryption, secrets management and key handling
• Take ownership of service deployment, CI/CD pipelines and containerised infrastructure
• Work with cryptography and research engineers to move new cryptographic primitives into production
• Support long-lived infrastructure used within digital asset, identity or settlement environments
• Contribute to systems designed with strong operational controls and auditability

Essential requirements

• Senior-level backend engineering experience building and operating security-critical production systems
• Strong production experience with Rust, including services that have been shipped and maintained at scale
• Strong TypeScript skills for backend services, APIs or libraries
• Experience within a digital asset or Web3 technology company
• Practical experience building systems where security and correctness are critical, such as digital asset custody, key management, identity, payments or regulated infrastructure
• Strong understanding of applied cryptography fundamentals including signing, encryption, secrets management and secure key handling
• Proven ability to build performant backend services and APIs for production environments
• Experience owning CI/CD pipelines, containerisation and service deployment using technologies such as Docker and Kubernetes

Nice-to-haves

• Production experience with threshold signing, multi-party computation or hardware security module integration
• Knowledge of post-quantum cryptography or experience migrating cryptographic primitives within live systems
• Experience designing systems within SOC 2 or ISO 27001 environments
• Familiarity with digital asset infrastructure including wallets, settlement systems and on-chain identity
• Open-source contributions to cryptography, security or infrastructure projects

Location and remote setup

This is a fully remote role for candidates based in Europe. The position is full-time and permanent.