Xsolla·Russia·2 окт.
Middle/Senior Backend Engineer
Ориентир по рынку≈ 200 000 – 325 000 ₽наша приблизительная оценка по 32 вакансиям этой роли и грейда, у работодателя вилка не указана
🌍 УдалённоMiddleПолная занятость🇷🇺 РФ🌍 Основана в СНГ
Стоит ли откликаться
Стоит откликнуться, но спросите про деньги
Сумму в объявлении не указали. Сколько платят за похожую работу, видно в разборе. Но в тексте есть формулировки, на которые стоит обратить внимание.
3 из 4 в норме
Зарплата не указана: ваша цель, нижняя граница и фраза для первого созвона
Деньги
Зарплату в объявлении не раскрыли. Ориентир на созвон: столько платят в 32 похожих вакансиях Backend Developer уровня Middle.
Живость
Висит 17 дней, признаков фиктивного найма нет.
Описание
Расписано подробно: обязанностей 43, требований 16. Картина ясна до первого созвона.
- Обещают
- стоматология
- Известно
- график 10:00-19:00, высокие нагрузки и микросервисы
- Не сказано
- как оформят
- Настораживает
- «fast-paced»: так пишут, когда задач больше, чем людей.
Что требуют
ОбязательноGoMongoDBPostgreSQLRedisRabbitMQKafkaRESTgRPCOpenAPIDocker
Надбавка к зарплате на этом уровне: REST +26%, Kafka +20%.
Полный разбор в Pro
Это короткий разбор. В Pro полный: под эту вакансию и ваше резюме
Сколько просить
Не продешевите: сумма под ваше резюме, нижняя граница и готовые фразы для торга
Ваше резюме против требований
Пройдёт ли ваше резюме фильтр: что совпало с требованиями и что дописать до отклика
Спросить у работодателя
Что стоит спросить: вопросы именно к этой вакансии для первого созвона
Когда откликаться
Стоит ли спешить: за сколько дней эта компания обычно закрывает вакансии
30 дней Pro: полный разбор каждой вакансииЧто ещё входит в Pro
Вакансия на английскомПереведёт заголовок и описание вакансии на русский
Чем предстоит заниматься
Develop backend services using Go with ethkit and go-ethereum for Ethereum interactions and RPC integration
Integrate with ZK Stack infrastructure: work with EraVM, system contracts, and L1↔L2 messaging
Build and maintain wallet backend indexing integrations for real-time token balance tracking and webhooks (via internal indexer or third-party providers)
Design and implement APIs for NFT marketplace and orderbook services, including on-chain order matching and settlement flows
Implement smart contract interaction layer using abigen-generated Go bindings for ERC-20/721/1155 tokens
Build Account Abstraction (ERC-4337) backend support: UserOperation submission and monitoring, paymaster gas-sponsorship logic, 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 efficient caching and indexing strategies for on-chain data using Redis and MongoDB
Write comprehensive tests including integration tests with local ZKsync test environment
Document APIs using OpenAPI/Swagger specification
Monitor and troubleshoot production systems, handle blockchain-specific edge cases (stuck transactions, gas estimation)
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)
Наши требования
Language: Go (go-ethereum, ethkit, idiomatic concurrency patterns)
Databases: MongoDB, PostgreSQL, Redis
Message Queue: NATS, RabbitMQ, Kafka
API: REST, WebSocket, gRPC, OpenAPI (Swagger)
ZK Stack / ZKsync Era: EraVM, zksolc/zkvyper compilers, system contracts, bootloader, native Account Abstraction on zkSync-family chains
Account Abstraction (ERC-4337): EntryPoint (v0.6–v0.8), UserOperation lifecycle (prepare→sign→submit→confirm), bundler and paymaster roles, ERC-7562 validation rules, ERC-6492 signature validation for undeployed accounts
Ethereum L1: go-ethereum, abigen for smart contract bindings, RPC and indexer semantics
Smart Contracts: Solidity, ERC-20/721/1155, modular account standards (ERC-7579 / ERC-6900), session keys (ERC-7710 / ERC-7715)
Signature Schemes: EIP-712 typed data, ERC-1271 contract signatures, WebAuthn/passkey (P-256)
Infrastructure: Docker, Kubernetes, GitLab CI/CD, Graylog
ZK Stack Integration: Working with EraVM execution environment, native Account Abstraction on zkSync-family chains, double resource accounting (EE gas + native computational resources), L1↔L2 communication via ZKsync Gateway, finality and reorg behavior
Account Abstraction Backend Services: Implementing the ERC-4337 UserOperation lifecycle, integrating with bundlers and paymasters, handling gas estimation failure modes and counterfactual deployment
Smart Contract Interaction: Generating Go bindings via abigen, handling factory dependencies for contract deployment, implementing EIP-712 transaction signing and ERC-1271 signature verification
Session Keys & Delegated Permissions: Supporting scoped, time-limited, contract-allowlisted authority (ERC-7710 / ERC-7715) for gasless, prompt-free gameplay transactions
Event Processing: Building blockchain event scanners for multiple chains (Ethereum, Polygon, Xsolla ZK), implementing reorg handling and transaction finality tracking
High-Availability Architecture: Designing resilient microservices for NFT marketplace and wallet backends with real-time WebSocket updates
Стек
Blockchain InfrastructureДополнительно
ABOUT US
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
ABOUT YOU
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!
About the project
Xsolla ZK is building a cross-game infrastructure that empowers gamers to freely trade and use their digital assets without barriers. The backend team develops services for
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