Middle/Senior Backend Engineer

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.

We are looking for a Middle/Senior Backend Engineer who is passionate about building scalable blockchain infrastructure and Web3 services to join our Xsolla ZK team. The best candidate will be someone who thrives in a fast-paced, highly collaborative, and exceptionally dynamic setting and is excited to develop backend systems that power NFT marketplaces, smart wallets, and blockchain-based gaming infrastructure.

Strong backend development skills in Go are essential, along with experience in building high-load distributed systems and working with databases. The ability to design resilient microservices architecture and integrate with blockchain networks will be key to your success in this role.

If you're passionate about building the infrastructure layer for next-generation gaming and love working on cutting-edge blockchain technology that enables gamers to truly own their digital assets, we would love to hear from you!

• 2+ years of commercial experience with Go

• Strong understanding of MongoDB and PostgreSQL (query optimization, indexing)

• Experience with Redis for caching and session management

• Knowledge of message queues (NATS, RabbitMQ, or similar)

• Experience designing and implementing REST APIs with OpenAPI/Swagger

• Understanding of microservices architecture patterns

• Experience with Docker and container orchestration basics

• Proficiency with Git and GitLab CI/CD

• Solid understanding of distributed systems concepts

• Experience with Ethereum/EVM blockchain integration:

• Working with go-ethereum library and RPC nodes

• Smart contract interaction via ABI bindings (abigen)

• Understanding of transaction lifecycle, gas estimation, nonce management

• Knowledge of ZK Stack / ZKsync Era:

• EraVM execution model and differences from EVM, including native Account Abstraction on zkSync-family chains

• System contracts (ContractDeployer, NonceHolder, etc.)

• L1↔L2 communication, bridging, and finality/reorg behavior

• Working knowledge of ERC-4337 Account Abstraction:

• EntryPoint contract and the UserOperation lifecycle

• Bundler and paymaster roles, gas estimation failure modes

• Session keys and delegated permissions (ERC-7710 / ERC-7715)

• Familiarity with signature schemes: EIP-712 typed data, ERC-1271 contract signatures, WebAuthn/passkey signers

• Exposure to AA infrastructure providers (any of: Sequence, thirdweb, Privy, Dynamic, Turnkey, Pimlico, Alchemy, Biconomy, ZeroDev, Safe{Core}) for wallet, indexer, or transaction-relay integrations

• Knowledge of token standards (ERC-20, ERC-721, ERC-1155) and their implementation details

• Experience with blockchain event processing: event scanning, reorg handling, finality

• Understanding of DeFi concepts and NFT marketplace mechanics

• Experience with Kubernetes for container orchestration

• Location: Remote (worldwide)

• Employment Type: Full-time

• Schedule: 10:00–19:00 (flexible)

• Contract: Employment agreement (entity or EOR arranged per candidate location)

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.

If you have questions regarding our hiring practices, please contact careers@xsolla.com.

For more vacancies, visit: xsolla.com/careers