Staff Software Engineer, Smart Wallet & Account Abstraction

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XsollaWeb3 gaming

Listing location: Canada; Workplace type: RemoteFull-TimeStaff

Salary not disclosed

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Job Details

Required Skills: PostgreSQLKubernetesTypeScriptGoDistributed Systems

Requirements

Have deep, hands-on ERC-4337 knowledge, including EntryPoint v0.6 through v0.8, UserOperation lifecycle, bundlers, paymasters, ERC-7562 validation, gas estimation, counterfactual deployment, and ERC-6492.
Have working knowledge of EIP-7702 delegation, its interaction with ERC-4337 EntryPoint v0.8, and associated risks.
Have experience building on or extending production smart account implementations such as Safe, Kernel, Biconomy, or Coinbase Smart Wallet, and familiarity with ERC-7579 or ERC-6900.
Have experience designing session keys and delegated permissions, including TTLs, contract allowlists, origin binding, revocation, and ERC-7710 or ERC-7715.
Have practical experience with EIP-712, ERC-1271, WebAuthn/passkey P-256 signers, EIP-1193, EIP-6963, EIP-5792, and ERC-7677.
Have designed or operated a production smart wallet or account abstraction system serving real users and value.
Bring substantial engineering experience at a large crypto product or protocol organization, or a comparable wallet, exchange, or account-abstraction infrastructure team.
Have operated systems where defects could result in lost funds and be able to discuss guardrails, reviews, and rollback paths.
Be able to read, review, and write Solidity account, paymaster, and module contracts; understand gas-aware design, upgrades, migrations, and work with external auditors.
Understand L2 execution differences, including zkSync-family native account abstraction, transaction and fee models, finality, reorgs, RPC, and indexer semantics.
Have strong Go engineering skills, including idiomatic code, concurrency, and performance profiling, and be able to design client-side SDKs in TypeScript.
Have distributed-systems experience, including consistency, availability, failure modes, and reconciliation of off-chain state against on-chain results.
Have experience with PostgreSQL schema design, query optimization, and migrations; Kubernetes operations; Kafka or NATS; Git; and modern CI/CD.
Have hands-on production key-management experience with secure platform storage, HSMs, MPC, or threshold signing, and understand wallet threat modeling.
Have proven experience leading multi-quarter technical initiatives across teams, influencing architecture and standards, and writing RFCs and design documents.

Responsibilities

Own the technical strategy and architecture of the smart wallet platform, including the account model, signing, session management, and gas abstraction.
Design and evolve the ERC-4337 user operation lifecycle, EIP-7702 delegation, deterministic address derivation, session keys, and permission primitives.
Set paymaster and gas-sponsorship strategy, including sponsorship limits, abuse defenses, and behavior when sponsorship is unavailable.
Define the security model for third-party dApp integrations, including provider behavior, origin-bound sessions, trust tiers, and transaction confirmations.
Lead the custody roadmap toward MPC-based custody and design recovery paths using passkeys, guardians, and social recovery.
Drive technical decisions on account architecture, SDK contracts, data modeling, and platform reliability across engineering teams.
Identify and lead work to address systemic risks involving key management, phishing, reorgs, indexers, bundlers, RPC dependencies, and contract upgrades.
Define engineering standards, review critical code, contracts, and designs, and support the team through documentation, tooling, and mentorship.
Align technical plans with product, security, legal, and infrastructure stakeholders.
Serve as the escalation point for complex production issues in the wallet and account abstraction domain.

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