Software Engineer (Application)-Remote

Xsolla · Remote, United States

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. n

The role

We are hiring a

Software Engineer, Web3 for

Xsolla ZK

, Xsollas Web3 ecosystem on a zkSync-based L2. smart wallets built on account abstraction;
SDKs that game studios and partners use to bring players on-chain;
infrastructure backend services for tokenizing in-game items and currencies;
This is a senior fullstack role: you work across backend, frontend and smart contracts.
Features end to end: backend, frontend and production
You make these decisions and justify them in writing
Security and correctness of what you ship: signing flows, interactions with contracts that hold user assets, keys and secrets
Production operation of your services, as part of the teams on-call rotation
Build backend services in Go and TypeScript: chain indexing, transaction relaying, event processing, APIs for dApps and SDKs
Build infrastructure backend services for tokenizing in-game items and currencies
Build dApp frontends in React: wallet connection, transaction signing, on-chain state in the UI
Integrate smart wallets into products: accounts, paymasters, bundlers
Develop SDKs used by game studios and partners
Set up and maintain AI tooling in the repositories (Claude Code, Codex, Cursor: rules, context, harness) so the team uses it effectively
5+ years of commercial software development, with senior-level production experience across backend and frontend
dApps that you shipped to production and maintained
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
EOAs, browser and embedded wallets, smart accounts; personal_sign (EIP-191) and typed data (EIP-712); network switching
UserOperations, gas sponsored via paymasters, signature validation for contract accounts (ERC-1271)
Backend

Go and TypeScript (Node.js) for production services
Relational databases (PostgreSQL) and caching (Redis)
Frontend

React and TypeScript: rendering model, state management, performance
Web security fundamentals: Reading and understanding Solidity contracts and the EVM (storage, gas, call semantics, proxy upgrade patterns, access control) well enough to integrate with them safely and review changes
Common contract vulnerability classes (reentrancy, front-running / MEV, oracle manipulation, signature replay) and how they affect the off-chain side
Operations

Testing: unit, integration, E2E
AI-assisted engineering

~

Daily hands-on use of AI coding tools (Claude Code, Codex, Cursor) for development and review, including configuring them for a repository

English

~

Spoken English at B2 level or higher

Designing, writing and testing smart contracts in Solidity with Foundry; Building ERC-4337 infrastructure yourself (bundlers, paymasters); Gaming domain experience
\Significant technical decisions are written up as an RFC or ADR that lays out the options and trade-offs. We discuss the document, not a blank whiteboard.
AI is part of everyday engineering.

We use AI coding tools for development and review, and we treat configuring them for a codebase as real engineering work.
You will work alongside product managers, designers, smart contract, backend and frontend engineers, QA and DevOps.
This includes medical, dental, and vision, PTO, and a personalized career roadmap for each employee. By investing in professional development through training and educational opportunities, we ensure that our team thrives both personally and professionally. Together, were not just building a business; were cultivating a community that values creativity, collaboration, and the transformative power of play.
Location:

Remote (worldwide)
Employment Type:

Full-time
Schedule:

10:00–19:00 (flexible)
Contract:

All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, language, sexual orientation, national origin, genetics, political beliefs, disability, age, marital status, social background or other characteristics.
We are committed to compliance with all fair employment practices regarding citizenship and immigration status.