Senior Backend Engineer
Core
Design, build, and operate end-to-end backend services for Xsolla ID (identity/auth) and Xsolla ZK (Web3 wallet infrastructure), focusing on reliability, security, and performance for critical user flows.
Role type
Senior Backend Engineer (Identity & Web3 Infrastructure)
Builds
Authentication platforms, smart wallet infrastructure, and account abstraction services on a zkSync-based L2.
Domain
Video game industry, Web3, Identity, Payments
Required skills
Go (idiomatic code, concurrency, profiling), PostgreSQL/MySQL, Redis, Kafka/RabbitMQ/NATS, REST/gRPC, OAuth 2.0/OIDC, Docker, Kubernetes, Datadog/Prometheus/Grafana, Git, CI/CD, AI coding tools (Claude Code, Codex, Cursor)
Preferred skills
Web3 backend experience, High-load systems, Cloud platforms (GCP/AWS/Azure), Infrastructure-as-code, NoSQL databases (MongoDB), Gaming/Fintech domain experience
Technologies
Go, PostgreSQL, MySQL, Redis, Kafka, RabbitMQ, NATS, Docker, Kubernetes, Datadog, Prometheus, Grafana, GitLab CI, Claude Code, Codex, Cursor
Responsibilities
Design and build services and APIs (REST, gRPC) for authentication and wallet operations; Define service boundaries and integration contracts; Build data models and optimize schemas/queries; Own observability (metrics, logs, tracing); Take part in on-call and incident response; Improve engineering environment (CI/CD, IaC, testing); Set up and maintain AI tooling in repositories
Seniority
Senior, hands-on IC