Senior Backend Engineer

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🕒 February 25

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Project Eleven

WebsiteLinkedInAll Job Openings

1 - 10 employees

Founded 2024

💼 Consulting

🏥 Healthcare

₿ Crypto

💰 $6M Seed on 2025-07

Consulting • Healthcare • Crypto

Project Eleven is a company focused on securing digital assets for the post-quantum era. It appears to develop or provide post-quantum cryptographic solutions, tooling, and guidance to protect blockchain keys, wallets, and other digital asset infrastructure against future quantum threats. The company likely produces software, research, or services aimed at migrating existing systems to quantum-resistant security and safeguarding Web3 and crypto-native assets.

📋 Description

• Own and evolve a security-critical core library used by multiple applications and runtimes • Design, implement, and maintain execution logic for blockchain transactions, signing flows, and protocol interactions • Build and maintain robust abstractions over blockchain RPCs, transaction construction, and network interactions • Enforce strict security boundaries around key handling, signing, and cryptographic operations • Define and uphold API stability guarantees, versioning strategy, and backward-compatibility policies • Contribute to internal security standards, documentation, and engineering best practices

🎯 Requirements

• Strong proficiency in Rust & Typescript (ideally both) • Experience building performant backend services, APIs and libraries at production scale • Practical experience in Web3 development e.g. Ethereum JSON-RPC, Viem/Ethers, Contract ABIs, call encoding/decoding etc • Good knowledge of CI/CD, service deployments, containerisation • Strong security knowledge e.g. authentication/authorization, signature verification, secrets management, encryption (especially post-quantum) • High competency with automated testing e.g. unit, integration and e2e testing • Strong English communication.

🏖️ Benefits

• Equal Opportunity • Committed to equal employment opportunity and believe that diverse teams build better products.