Job Description
One of our clients, a fast-growing startup based in Barcelona, is looking for a Blockchain Engineer (Smart Contracts) to take ownership across their onchain product surface: smart contracts, wallet/vault architecture, and the overall developer experience.
They are building developer-first infrastructure, where engineering and product are tightly connected. The team values simple primitives, intuitive APIs, and rapid iteration. This role goes beyond shipping smart contracts — it's about turning complex wallet infrastructure into something developers truly enjoy using.
What you'll do
Design, build, and ship Solidity smart contracts powering wallets, vaults, and account systems (upgradeability, access control, permissions, sessions, spend limits, etc.).
Own end-to-end product features from spec → contract architecture → implementation → testing → deployment → monitoring, driven by real user needs.
Build wallet and vault primitives with a strong security mindset, including k...
They are building developer-first infrastructure, where engineering and product are tightly connected. The team values simple primitives, intuitive APIs, and rapid iteration. This role goes beyond shipping smart contracts — it's about turning complex wallet infrastructure into something developers truly enjoy using.
What you'll do
Design, build, and ship Solidity smart contracts powering wallets, vaults, and account systems (upgradeability, access control, permissions, sessions, spend limits, etc.).
Own end-to-end product features from spec → contract architecture → implementation → testing → deployment → monitoring, driven by real user needs.
Build wallet and vault primitives with a strong security mindset, including k...
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