[Hiring] Software Engineer @Xsolla

Role Description

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

• 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.

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
• 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

What You Will Do

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

Qualifications

• 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
• Experience with 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
• Hands-on experience with smart wallets: UserOperations, gas sponsored via paymasters, signature validation for contract accounts (ERC-1271)

Requirements

• 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)
• 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)
• Daily hands-on use of AI coding tools (Claude Code, Codex, Cursor) for development and review, including configuring them for a repository
• Spoken English at B2 level or higher

Nice to Have

• zkSync/ZK Stack and the specifics of the zk-rollup stack
• 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
• Gaming domain experience

Benefits

• Comprehensive Benefits Program including medical, dental, and vision
• PTO
• Personalized career roadmap for each employee
• Investment in professional development through training and educational opportunities
• Supportive environment prioritizing physical, mental, and emotional well-being

Employment Details

• Location: Remote (worldwide)
• Employment Type: Full-time
• Schedule: 10:00–19:00 (flexible)
• Contract: Employment agreement (entity or EOR arranged per candidate location)

Equal Employment Statement

Xsolla is dedicated to creating a diverse environment and is proud to be an equal-opportunity employer. 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.

Contact

If you have questions regarding our hiring practices, please contact [email protected] . For more vacancies, visit xsolla.com/careers .