About Us

We build concrete Web3 products (DeFi / tokenization / infrastructure) with one obsession: security, performance, and ease of use. Our stack is centered on Ethereum & its ecosystem (L2, tooling, audits, monitoring).
📍 Location: Remote / Hybrid / On-site (to be specified)
🕒 Type: Permanent / Contract / Freelance (to be specified)

Your mission

As a Senior Blockchain Developer (Ethereum), you will design, develop, and secure smart contracts and associated backend services, and you will help the team increase its technical maturity.

Specifically, you will :

• Design and develop Smart Solidity contracts (ERC-20/721/1155, proxies, advanced patterns).

• Implement a security-first strategy: code reviews, fuzzing, invariants, simulations, audit readiness.

• Build the development tooling: Hard Hat / Foundry, CI, coverage, unit and integration testing, deployment scripts.

• Design the on-chain/off-chain interaction architecture (indexing, events, subgraphs, oracles if needed).

• Optimize gas, performance and reliability (monitoring, alerting, key management, permissions).

• Participate in product/tech choices (L2, account abstraction, standards, upgradeability).

• Mentor developers and contribute to best practices (ADR, documentation, patterns, reviews).

Desired Profile

Essential

• 5+ years of development experience, including 2+ years on Ethereum / EVM in production.

• Excellent command of Solidity and the main patterns (access control, upgradeability, pausable, roles).

• Very good level in testing and quality: Foundry/Hard Hat, property-based tests, testnets, mainnet deployments.

• Good security culture: reentrancy, MEV, frontrunning, overflow/underflow, signature malleability, etc.

• Comfortable with Git, CI/CD, Code review and product teamwork.

  Bonus Perks

  • • • Experience in DeFi (AMM, lending, staking, vaults, liquidation).

      • Knowledge of L2 (Optimism/Arbitrum/Base/zkSync) and bridges/messaging.

      • Audit experience (internal or external), Echidna, Slither, Mythril, Tenderly.

      • Node / Rust / Go / Python on the tooling or services side.

      • Experience with The Graph, indexers, on-chain data pipelines.

  Stack & tools

  • • • Smart contracts: Solidity, Foundry/Hardhat, OpenZeppelin

      • Infra: RPC providers, multisig (Safe), monitoring (Tenderly/Defender-like), CI/CD

      • Off-chain: Node/TS (often), indexing, subgraphs (depending on the product)

  What we offer

  • • • Compensation: XX–YY € (depending on profile) + bonus / tokens (if applicable)

      • Full remote work possible + equipment budget

      • Time dedicated to security (testing, audits, bug bounties)

      • Autonomy, product impact, real technical decisions

      • A team that values clean PRs and useful documentation

  Recruitment process (example)

  • 1. 30-minute call (fit + context)

    2. Technical interview (Solidity/EVM + architecture)

    3. Short exercise (audit/review or mini-feature)

    4. Team meeting + offer