Xsolla - Senior Backend Engineer

Moscow1w ago

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 • Decisions in writing. Significant technical decisions are written up as an RFC or ADR that lays out the options and trade-offs. We discuss the document, not a blank whiteboard. • AI is part of everyday engineering. We use AI coding tools for development and review, and we treat configuring them for a codebase as real engineering work. • Technical interview. Built directly on the What you will own and Required sections above. We won't ask about anything this posting doesn't promise. • Bar raiser. An engineer from outside the hiring team checks that you raise the overall engineering bar. • You will work alongside product managers, designers, backend and frontend engineers, QA and DevOps.

Responsibilities

• 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 • 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 (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 • 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 • 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 • 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 • Engineering practices • Testing: unit, integration, contract • Git, CI/CD (GitLab CI or similar) • AI-assisted engineering • 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

Benefits

• We are passionate about fostering a supportive environment for our team, so we prioritize the physical, mental, and emotional well-being of our employees and their families through a comprehensive Benefits Program. This includes medical, dental, and vision, PTO, and a personalized career roadmap for each employee. By investing in professional development through training and educational opportunities, we ensure that our team thrives both personally and professionally. Together, we're not just building a business; we're cultivating a community that values creativity, collaboration, and the transformative power of play. • EMPLOYMENT DETAILS • Location: Remote (worldwide) • Employment Type: Full-time • Schedule: 10:00–19:00 (flexible) • Contract: Employment agreement (entity or EOR arranged per candidate location) • EQUAL EMPLOYMENT STATEMENT