Backend Engineer

Xsolla Inc.; United States; Remote; USD 120,000 - 190,000; Full time

Benefits offered by this job

Medical

Dental

Vision

PTO

Personalized career roadmap for each —

Job summary

Xsolla Inc. is seeking an accomplished Senior Backend Engineer to own end-to-end backend services for identity and wallet platforms in a remote, worldwide setting.

You will design, build, and operate high-performance Go services with REST/gRPC APIs, Kafka-based messaging, and robust observability. Strong Web3 wallet experience is essential.

Qualifications

• Web3 backend experience: blockchain integration, wallet infrastructure, account abstraction.
• Cloud platforms and infrastructure-as-code (IaC) experience.
• Domain experience in gaming, e-commerce, fintech or payments.

Responsibilities

• Design, implement, and operate backend services for authentication, accounts, and wallet operations.
• Define service boundaries, data ownership, and integration contracts with other teams.
• Build scalable APIs (REST, gRPC) and ensure reliability, observability, and security.
• Own on-call, incidents, post-mortems, and performance tuning under load.
• Improve CI/CD, IaC, testing, and AI-assisted tooling usage in repos.

Skills

Go

Concurrency

pprof

PostgreSQL

Redis

Kafka

REST

gRPC

OpenAPI

OAuth 2.0

Docker

Kubernetes

Datadog

OpenTelemetry

CI/CD

AI tooling

Tools

GitLab CI

Datadog

Kubernetes

Docker

OpenTelemetry

OpenAPI/Swagger

Job description

Описание:

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. We are hiring a Senior Backend Engineer for two platform products: - Xsolla ID 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.

Задачи:

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 (goroutines, 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 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 English Reading technical documentation in English

Требования:

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

Условия:

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. HOW WE HIRE Intro call. Your background, your motivation and the role. 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. 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)

• medical
• dental
• vision
• PTO
• personalized career roadmap for each employee