Location: Remote-friendly globally. Time-zone band UTC-1 to UTC+5 (meaningful Saudi hours overlap). Optional relocation to Riyadh.
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Reports to: Custody Platform Lead.
Type: Full-time. Individual Contributor.
About the Role:
The role is for a senior backend engineer with a custody and key-management background. You will serve as a foundational engineer on the custody platform, reporting to the Custody Platform Lead.
Responsibilities:
- Ship production custody code across signing service, key management, chain integrations, and the transaction pipeline.
- Own a chain or a subsystem. Within 3 months, you should own a meaningful surface end-to-end (a chain integration, a signing-service component, a key-rotation flow).
- Pair with the Custody Platform Lead and our in-house cryptography function on threshold signing, share generation, and key recovery flows.
- Write post-mortems when things break. These are treated as architecture-improvement opportunities, not blame exercises.
- Integrate new chains. Bitcoin, Ethereum and L2s, Solana, and an active onboarding queue.
- Engage in async written communication. Spec docs, PR descriptions, async design reviews.
Must-Haves:
- 5-plus years of backend engineering, with the last 2-plus years on a custody platform or a key management system at a regulated entity. General fintech does not substitute.
- Hands-on with at least one of:
- HSM lifecycle (CloudHSM, YubiHSM, Ledger Vault, similar).
- MPC / TSS (Fireblocks-style, Sepior, ZenGo, Curv-style).
- Threshold signing schemes (GG18, GG20, FROST, CGGMP21, CMP).
- Production experience with one or more of:
- Bitcoin (UTXO model, PSBT).
- Ethereum (EIP-712, EIP-1559, account abstraction).
- At least one non-EVM Layer 1 (Solana, Sui, Cosmos SDK chain, similar).
- Reads Solidity, Move, or Rust well enough to integrate with new chains without hand-holding.
- Strong async written communication. Your PR threads, design docs, and intro reply should signal your communication ability.
- English fluency.
Nice-to-Haves:
- Experience with travel-rule / FATF compliance integrations (Notabene, Sumsub, TRP, IVMS101).
- Authored or contributed to an EIP, BIP, or chain RFC.
- Audit-contest finalist on Code4rena, Sherlock, or Cantina.
- Familiarity with regulated-financial controls: dual-control, four-eyes, M-of-N approvals, SOC 2 evidence collection.
This is not the right role if:
- You have only frontend / dApp experience with no backend custody or key-management depth.
