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.

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We are hiring a Senior Backend Engineer for two platform products:

• Xsolla is the identity and authentication platform behind sign-in, account management and SSO across Xsolla products.

• Xsolla ZK is Web3 wallet infrastructure: smart wallets and account abstraction on a zkSync-based L2.

Both products sit on users' most sensitive flows, logging in and signing transactions, and other Xsolla teams build on top of them.

• The backend services of your product area end to end: design, implementation, release and production operation, including on-call

• Architecture across services: service boundaries, integration contracts and data ownership. You make these decisions and justify them in writing

• Reliability and security of critical flows: SLOs, failure handling, protection of user data and credentials

• Service performance and cost under load

• Design and build services and APIs (REST, gRPC) for authentication, account management and wallet operations
• Define service boundaries and integration contracts with other Xsolla teams
• Design data models and storage; optimize schemas and queries
• Build event-driven and asynchronous workflows
• Own observability: metrics, logs, tracing and alerting, and act on what production tells you
• Take part in on-call, incident response and post-mortems
• Improve the engineering environment: CI/CD, infrastructure-as-code, testing
• Review code
• Set up and maintain AI tooling in the repositories (Claude Code, Codex, Cursor: rules, context, harness) so the team uses it effectively

• Language and platform
  • 5+ years of commercial backend development
  • Go: idiomatic code, concurrency (go routines, channels, context and cancellation), memory and performance profiling (pprof)
• Data
  • Relational databases (PostgreSQL, MySQL): schema design, indexes, query plans, transactions and isolation levels, safe migrations
  • Caching (Redis): when to cache, invalidation, consistency trade-offs
• Distributed systems
  • Service architecture and distributed-systems trade-offs: consistency, availability, idempotency, retries, failure modes
  • Asynchronous messaging and event-driven design (Kafka, RabbitMQ or NATS): delivery guarantees, ordering, reprocessing
• APIs
  • Designing REST and gRPC APIs: versioning, backward compatibility, contract documentation (OpenAPI / Swagger, Protobuf)
• Security and identity
  • Application security: common vulnerability classes (OWASP Top 10), secrets management, safe handling of user data
  • OAuth 2.0 / OIDC from the server side: flows, tokens, sessions
• Operations
  • Containers and orchestration (Docker, Kubernetes) at the level of deploying and debugging your own services
  • Observability (we use Datadog; experience with Prometheus, Grafana, ELK / Graylog or Open Telemetry also counts): metrics, logs, tracing and alerting; diagnosing incidents in production
• Engineering practices
  • Testing: unit, integration, contract
  • Git, CI/CD (Git Lab CI or similar)
• AI-assisted engineering
  • Daily hands-on use of AI coding tools…