1 month ago
Canada (city not specified)Staff+
Responsibilities
- Own the technical strategy and architecture of the smart wallet and account-abstraction platform, including account models, signing, sessions, and gas abstraction.
- Design ERC-4337 user-operation flows, EIP-7702 delegation, deterministic address derivation, session-key permissions, and dApp-facing wallet interfaces.
- Define paymaster and gas-sponsorship policies, metering, abuse defenses, caps, and degraded operating modes.
- Harden provider, transaction-confirmation, origin-binding, trust-tier, and policy-versioned session behavior for third-party applications.
- Lead custody and recovery roadmaps covering MPC, passkeys, guardians, and social recovery.
- Drive cross-team decisions on account architecture, SDK contracts, data models, reliability, and build-versus-buy choices.
- Identify and resolve systemic risks involving key management, phishing, reorgs, stale indexers, bundlers, RPC dependencies, and contract upgrades.
- Set engineering standards, review critical code and designs, document systems, mentor engineers, and influence architecture beyond the immediate team.
- Collaborate with product, security, legal, and infrastructure stakeholders and translate business and regulatory needs into technical plans.
- Serve as the escalation point for complex production issues in the wallet and account-abstraction domain.
Requirements
- Deep hands-on knowledge of ERC-4337, including EntryPoint versions 0.6 through 0.8, UserOperations, bundlers, paymasters, ERC-7562 validation, gas estimation, counterfactual deployment, and ERC-6492 signatures.
- Working knowledge of EIP-7702, EOA delegation, the post-Pectra ecosystem, and its security and storage trade-offs.
- Experience building or extending production smart-account implementations such as Safe, Kernel, Biconomy, or Coinbase Smart Wallet, with familiarity with ERC-7579 and ERC-6900.
- Experience designing scoped, time-limited, policy-bound session keys and delegated permissions, including ERC-7710 and ERC-7715.
- Practical command of EIP-712, ERC-1271, WebAuthn, passkeys, P-256 signers, EIP-1193, EIP-6963, EIP-5792, and ERC-7677.
- Production experience designing or operating a smart wallet or account-abstraction system serving real users and real value.
- Substantial engineering experience at a major crypto organization or comparable wallet, exchange, or account-abstraction infrastructure team, with experience operating systems where bugs could cause lost funds.
- Ability to read, review, and write Solidity account, paymaster, and module contracts, including gas-aware design, upgradeability, migrations, and auditor collaboration.
- Understanding of L2 execution, zkSync-family native account abstraction, transaction and fee models, finality, reorgs, RPC behavior, and indexer semantics.
- Strong Go engineering skills, including idiomatic code, concurrency, and performance profiling.
- Ability to design and own TypeScript SDK surfaces for internal and external developers.
- Experience with distributed systems, off-chain/on-chain reconciliation, PostgreSQL schema design and optimization, Kubernetes operations, and Kafka or NATS event streaming.
- Experience with production key material, Keychain or Keystore storage, HSMs, MPC or threshold signing, and wallet threat modeling.
- Proven ability to lead multi-quarter cross-team initiatives, influence architecture and standards, write effective RFCs and design documents, and communicate clearly.
- Preferred experience includes video-game platforms, zkSync or Elastic Chain, AA infrastructure vendors, MPC or social recovery, NFT and token infrastructure, open-source wallet or identity projects, crypto compliance, OAuth 2.0/OIDC, JWT, React Native, Expo, WebView provider injection, and modern AI coding tools.
Tech Stack
Categories
About Xsolla
Xsolla builds commerce and monetization infrastructure for video games, offering payment processing, merchant-of-record services, storefronts, subscriptions, and anti-fraud tools for developers and publishers. The privately held company, founded in 2005 and headquartered in Sherman Oaks, California, supports direct-to-consumer sales and global tax/compliance across many regions and payment methods. Its platform targets studios from indie to AAA and powers distribution, marketing, and in-game purchases.