Middle/Senior Backend Engineer

Xsolla

. Develop backend services using Go, ethkit, and go-ethereum for Ethereum interactions and RPC integration .

Posted 10/6/2026full-timeRemote • RussiaSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in developing backend services using Go for Ethereum interactions, including smart contract integration and API design. Proficient in database management with MongoDB and PostgreSQL, and experienced in implementing caching strategies with Redis.

Highest-signal resume keywords

Go ProgrammingMongoDBRedisEthereum IntegrationREST API Design

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Go ProgrammingMongoDBPostgreSQLRedisOpenAPI/SwaggerDockerGitGitLab CI/CDDistributed SystemsBlockchain Event Processing

Tools & Technologies

ZK StackNATSRabbitMQKubernetesEraVM

Industry Keywords

EthereumEVMERC-20ERC-721ERC-1155Account AbstractionDeFiNFT MarketplaceMicroservicesBFF Services

Tech Stack

Tools & technologies

Distributed SystemsDockerKubernetesMicroservicesMongoDBPostgresRabbitMQRedisGo

About the role

Key responsibilities & impact

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

What you’ll need

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

Comp & perks

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