Middle/Senior Backend Engineer

ABOUT US

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.

ABOUT THE PROJECT Xsolla ID is a strategic core service — the centralized identity provider for the entire Xsolla ecosystem. It is not just a login form; it's a comprehensive IAM platform enabling authentication and authorization across all B2C products, including Xsolla Wallet, Xsolla App, Web Shops, and partner integrations. Tech Stack: Language: Go Databases: CockroachDB Infrastructure: Docker, Kubernetes, Nginx Protocols: OAuth 2.0, OpenID Connect, WebAuthn Architecture: Microservices, High Availability design Key Technical Challenges: Building Web2 & Web3 authentication flows (OTP, passkeys, biometrics, wallet-based login) High availability and scaling for millions of concurrent users SDK development and integration with multiple Xsolla products

RESPONSIBILITIES Develop and maintain backend services for the Xsolla ID platform using Go

Design and implement authentication/authorization flows (OAuth 2.0, OIDC, WebAuthn)

Optimize database queries and ensure high performance under heavy loads (CockroachDB, MySQL, Redis)

Build and maintain microservices architecture with focus on reliability and scalability

Write clean, well-tested code with comprehensive unit and integration test coverage

Collaborate with frontend engineers on SDK and widget integration

Participate in code reviews and contribute to technical documentation

Support production systems and troubleshoot issues across the authentication stack

REQUIREMENTS Required:

3+ years of commercial experience with Go

Strong understanding of PostgreSQL and Redis (query optimization, indexing strategies)

Experience with Docker and docker-compose

Proficiency with Git and collaborative development workflows

Understanding of Nginx and web server configuration

Solid experience writing unit tests and maintaining high code quality

Good English reading skills (technical documentation)

Preferred:

Understanding of microservices architecture principles

Experience with REST API design and documentation ( Swagger/OpenAPI )

Hands-on experience with CI/CD pipelines

Familiarity with Jira for project management

Knowledge of OAuth 2.0 , OpenID Connect , or other authentication protocols

Experience with RabbitMQ or similar message brokers

Understanding of Kubernetes and container orchestration

Sharing of GitHub profile is a plus

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 100% company-paid medical, dental, and vision plans, unlimited Flexible Time Off, 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.

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