Xsolla
From Xsolla's careers page
Status: listed on the employer's own careers page when we last checked (daily). Confirm on their site before applying.
ABOUT YOU We are looking for a Software Engineer, Web3 for Xsolla ZK, Xsolla's Web3 ecosystem on a zkSync-based L2.
We are looking for a Software Engineer, Web3 for Xsolla ZK, Xsolla's Web3 ecosystem on a zkSync-based L2. This will involve working on: 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, ecosystem dApps: a DEX, an NFT marketplace and an auction. This is a senior fullstack role: you work across backend, frontend and smart contracts.
Xsolla is a global commerce company with robust tools and services to help developers solve the inherent challenges of the video game industry. From indie to AAA, companies partner with Xsolla to help them fund, distribute, market, and monetize their games. Grounded in the belief in the future of video games, Xsolla is resolute in the mission to bring opportunities together, and continually make new resources available to creators. Headquartered and incorporated in Los Angeles, California, Xsolla operates as the merchant of record and has helped over 1,500+ game developers to reach more players and grow their businesses around the world. With more paths to profits and ways to win, developers have all the things needed to enjoy the game. For more information, visit xsolla.com.
WHAT YOU WILL OWN
Features end to end: backend, frontend and production
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
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 team's 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
Monitor services and contracts in production and take part in on-call
Review code
5+ years of commercial software development, with senior-level production experience across backend and frontend
dApps that you shipped to production and maintained
Web3 libraries and wallets
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
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
Hands-on experience with smart wallets: UserOperations, gas sponsored via paymasters, signature validation for contract accounts (ERC-1271)
Backend
Go and TypeScript (Node.js) for production services
Processing on-chain events: idempotency, reorg handling, retries
Asynchronous messaging and event-driven design (Kafka, RabbitMQ or NATS): delivery guarantees, ordering, reprocessing
Relational databases (PostgreSQL) and caching (Redis)
Designing REST and gRPC APIs: versioning, backward compatibility
Frontend
React and TypeScript: rendering model, state management, performance
Web security fundamentals: XSS, CSRF, CSP, safe handling of signatures and keys in the browser
Smart contracts
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
Containers and orchestration (Docker, Kubernetes) at the level of deploying and debugging your own services
Observability (we use Datadog; experience with Prometheus, Grafana, ELK / Graylog or OpenTelemetry also counts): metrics, logs, tracing and alerting for services and contracts; diagnosing incidents in production
Engineering practices
Testing: unit, integration, E2E
Git, CI/CD (GitLab CI or similar)
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
Designing, writing and testing smart contracts in Solidity with Foundry; deploying and upgrading them safely
Building ERC-4337 infrastructure yourself (bundlers, paymasters); EIP-6963, EIP-5792
DeFi: DEX and AMM mechanics
NFTs and marketplaces: ERC-721, ERC-1155, auction mechanics
L2 infrastructure: running nodes, indexers, bridges
Designing SDKs for external developers
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.
Technical interview. Built directly on the Responsibilities and Qualifications & Skills sections above. We won't ask about anything this posting doesn't promise.
Bar raiser. An engineer from outside the hiring team checks that you raise the overall engineering bar.
Scores your resume against this job the way resume scanners do: the job's hard and soft skills, searchability, recruiter tips and formatting.
Create a free account to see your score. Your resume stays in this browser until then, and we never store it.
Already a member? Sign in