Middle/Senior Backend Engineer

🔥 1 minute ago

🇷🇺 Russia – Remote

⏰ Full Time

🟠 Senior

🔙 Backend Engineer

👻 Ghost score 20%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Xsolla

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2005

💼 Consulting

📣 Marketing

📦 Logistics

Consulting • Marketing • Logistics

Xsolla is a company specializing in game commerce solutions. It provides tools and services that empower video game developers to monetize, distribute, and fund their games, helping them to increase revenue at any stage of development. Xsolla offers a wide range of solutions such as customizable web shops, payment processing, fraud prevention, and social packages to enhance player engagement. With over 19 years of experience in the video game industry, Xsolla collaborates with developers and publishers globally to manage compliance, taxes, and operational complexities, allowing them to focus on connecting with their players. Their services are designed to work with popular game development platforms like Unity, Unreal, and Cocos Creator, supporting a wide array of local payment methods worldwide.

📋 Description

• Develop backend services using Go, ethkit, and go-ethereum for Ethereum interactions and RPC integration • Integrate with ZK Stack infrastructure, including EraVM, system contracts, and L1↔L2 messaging • Build and maintain wallet backend indexing integrations for real-time token balance tracking and webhooks • Design and implement APIs for NFT marketplace and orderbook services, including on-chain order matching and settlement flows • Implement smart contract interaction layers using abigen-generated Go bindings for ERC-20/721/1155 tokens • Build Account Abstraction (ERC-4337) backend support, including UserOperation submission and monitoring, paymaster gas-sponsorship logic, and session-key issuance and revocation • Develop blockchain event scanners with reorg handling for Ethereum, Polygon, and Xsolla ZK chains • Implement BFF (Backend-for-Frontend) services orchestrating complex multi-chain operations • Design caching and indexing strategies for on-chain data using Redis and MongoDB • Write comprehensive tests, including integration tests with a local ZKsync test environment • Document APIs using OpenAPI/Swagger • Monitor and troubleshoot production systems and handle blockchain-specific edge cases such as stuck transactions and gas estimation

🎯 Requirements

• 2+ years of commercial experience with Go • Strong understanding of MongoDB and PostgreSQL, including query optimization and indexing • Experience with Redis for caching and session management • Knowledge of message queues such as NATS or RabbitMQ • 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 • Preferred: Experience with Ethereum/EVM blockchain integration • Preferred: Knowledge of ZK Stack/ZKsync Era • Preferred: Working knowledge of ERC-4337 Account Abstraction • Preferred: Familiarity with EIP-712, ERC-1271, and WebAuthn/passkey signature schemes • Preferred: Knowledge of ERC-20, ERC-721, and ERC-1155 token standards • Preferred: Experience with blockchain event processing • Preferred: Understanding of DeFi concepts and NFT marketplace mechanics • Preferred: Experience with Kubernetes

🏖️ Benefits

• Medical, dental, and vision coverage • Paid time off (PTO) • Personalized career roadmap • Professional development through training and educational opportunities • Flexible schedule • Remote work worldwide