(english) Software Engineer (Rust) - Confidential Blockchain Protocol (perm job - Paris OR Full remote) (80-110k euros)
🔐 My client : Join a DeepTech Scale-Up building the future of encrypted blockchains
- Leading French cryptography and blockchain scale-up, born from academic research
- Over €150M raised in Series B (2024–2025), valuation > €1B
- Backed by top-tier investors, founded by world-renowned researchers & engineers
- Building the first confidential cross-chain protocol enabling encrypted smart contracts on Ethereum, Solana and more
- Tech stack combines FHE (Fully Homomorphic Encryption), MPC, and ZK Proofs
- Open-source infrastructure designed for global developer adoption
- Testnet already live – Mainnet and token launch coming in 2025
- International team of 90+ (60+ in R&D), remote-first culture, based in Paris
💰 Package: €80,000–110,000 + equity (BSPCE) + travel and accommodation expenses covered for candidates outside the Paris region
—> If you’re based outside France, you will have a Deel contract.
🧩 Your mission: reconcile confidentiality with public blockchains
One of the biggest barriers to mass blockchain adoption is the lack of native confidentiality. Because all transactions and data are public, sensitive use cases like payments, identity, governance, and financial assets remain severely limited.
Our client is launching in 2025 a groundbreaking solution: the Confidential Blockchain Protocol, a cryptographic layer that enables the execution of fully encrypted smart contracts on existing blockchains such as Ethereum or Solana — without creating a new L1 or complex bridging.
This architecture relies on a unique combination of cutting-edge technologies:
- FHE (Fully Homomorphic Encryption): allows computations directly on encrypted data
- MPC (Multi-Party Computation): decentralizes the decryption keys
- ZK Proofs (Zero-Knowledge): ensures the integrity of encrypted inputs without revealing their content
It is today the first truly programmable, interoperable, and scalable solution for running confidential dApps on public blockchains.
Main responsibilities: you will actively contribute to building this open-source, developer-friendly cryptographic infrastructure.
You will work on backend challenges (mainly Rust), as well as system and product problems, alongside experts in cryptography, blockchain, and distributed protocols.
✅ What we’re looking for
🎓 Education: Master’s/PhD in Computer Science, Engineering, or related field
🔧 Core Requirements:
- 3+ years of experience as a Rust developer (or equivalent low-level/backend expertise)
- Strong backend engineering skills: APIs, scalability, system design, testing, performance
- Curiosity or experience in blockchain ecosystems (EVM, smart contracts, L1/L2)
- Fluent in English (working language)
⭐ Nice to have:
- Background or strong interest in cryptography (FHE, MPC, ZK)
- Experience in high-security, high-performance systems
- Contributions to open-source projects
🤝 Hiring Process
- Take-home technical challenge (1 week to complete)
- Technical debrief & culture fit (1h with Tech Lead)
- HR call in English (15 min)
- Live in-office experience (2 days @ Paris): meet the team in Paris, share lunch/drinks, work together
💬 If you love writing robust, elegant Rust, are passionate about modern cryptography, and want to redefine privacy in decentralized systems, this is your chance.
