[Hiring] Senior Backend Engineer @Xsolla

Role Description

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

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

What You Will Own

• 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.

What You Will Do

• 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.

Qualifications

• 5+ years of commercial backend development.
• Go: idiomatic code, concurrency (goroutines, channels, context and cancellation), memory and performance profiling (pprof).
• Relational databases (PostgreSQL, MySQL): schema design, indexes, query plans, transactions and isolation levels, safe migrations.
• Caching (Redis): when to cache, invalidation, consistency trade-offs.
• 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.
• Designing REST and gRPC APIs: versioning, backward compatibility, contract documentation (OpenAPI / Swagger, Protobuf).
• 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.
• 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 OpenTelemetry also counts): metrics, logs, tracing and alerting; diagnosing incidents in production.
• Testing: unit, integration, contract.
• Git, CI/CD (GitLab CI or similar).
• Daily hands-on use of AI coding tools (Claude Code, Codex, Cursor) for development and review, including configuring them for a repository.
• Reading technical documentation in English.

Requirements

• Web3 backend experience: blockchain integration, wallet infrastructure, account abstraction.
• High-load systems.
• Cloud platforms (GCP, AWS or Azure) and infrastructure-as-code.
• NoSQL databases (MongoDB or similar).
• Domain experience in gaming, e-commerce, fintech or payments.

Benefits

• Medical, dental, and vision coverage.
• PTO.
• A personalized career roadmap for each employee.
• Investing in professional development through training and educational opportunities.
• Cultivating a community that values creativity, collaboration, and the transformative power of play.

Company Description

Xsolla is a global commerce company with robust tools and services to help developers solve the inherent challenges of the video game industry. 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.