Software Engineer

About the role

ABOUT XSOLLA

Xsolla is a global video game commerce company headquartered in Los Angeles. It helps developers from indie to AAA fund, distribute, market and monetize their games, and acts as merchant of record for 1,500+ developers worldwide. For more information, visit xsolla.com.

The role We are hiring a Software Engineer, Web3 for Xsolla ZK, Xsolla's Web3 ecosystem on a zkSync-based L2. It includes:

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smart wallets built on account abstraction;

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SDKs that game studios and partners use to bring players on-chain;

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infrastructure backend services for tokenizing in-game items and currencies;

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ecosystem dApps: a DEX, an NFT marketplace and an auction.

This is a senior fullstack role: you work across backend, frontend and smart contracts.

WHAT YOU WILL OWN

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Features end to end: backend, frontend and production

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The on-chain / off-chain architecture of your product: what lives in contracts, what lives in services, and how the two stay consistent. You make these decisions and justify them in writing

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Security and correctness of what you ship: signing flows, interactions with contracts that hold user assets, keys and secrets

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Production operation of your services, as part of the team's on-call rotation

WHAT YOU WILL DO

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Build backend services in Go and TypeScript: chain indexing, transaction relaying, event processing, APIs for dApps and SDKs

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Build infrastructure backend services for tokenizing in-game items and currencies

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Build dApp frontends in React: wallet connection, transaction signing, on-chain state in the UI

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Integrate smart wallets into products: accounts, paymasters, bundlers

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Develop SDKs used by game studios and partners

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Monitor services and contracts in production and take part in on-call

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Review code

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Set up and maintain AI tooling in the repositories (Claude Code, Codex, Cursor: rules, context, harness) so the team uses it effectively

Required Experience

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5+ years of commercial software development, with senior-level production experience across backend and frontend

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dApps that you shipped to production and maintained

Web3 libraries and wallets

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viem and wagmi in production: clients and transports, contract reads and writes with typed ABIs, event subscriptions, wagmi hooks and connectors, caching and invalidation of on-chain state

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How wallet signers work: EOAs, browser and embedded wallets, smart accounts; personal_sign (EIP-191) and typed data (EIP-712); the EIP-1193 provider; network switching