Principal Engineer — DevX & AI
Xsolla is a video game commerce company that provides a suite of tools and services—including merchant of record payment processing, tax management, fraud prevention, compliance, refunds, dispute management, and end-user support—to help game developers and publishers launch, grow, and monetize their games globally. It serves video game developers, publishers, and studios of all sizes across global and regional markets.
About Xsolla
Xsolla connects the tools, systems, payments, and web shops used by the video games industry, positioning itself as a global merchant of record supporting over 1,000 payment methods and a cumulative audience of 50 million, with transaction fees around 5%. Its services include tax management, fraud monitoring and prevention, global and regional regulatory compliance, refund and dispute management, and end-user payment support. Xsolla's product lineup includes the Xsolla SDK for native in-app payments on side-loaded apps and alternative app stores, a Buy Button enabling link-out purchases from iOS mobile games in the U.S., and Web Shop for building customized, direct-to-consumer game storefronts. The company works with major gaming industry partners and clients such as Mytona, Ubisoft, MARVEL SNAP, and others, and highlights partner success stories, industry events, and its own culture and hiring initiatives on its site.
Skills
About the Role
You will take architectural ownership of the agent-readable Shop Builder platform as the most senior individual contributor on the DevX and AI team. You will define how developers and AI agents interact with Shop Builder's foundational capabilities, including UI as Data, custom blocks, themes, data binding, catalog, and payments. You will be the technical authority on what the platform exposes and how, staying deeply hands-on with the hardest parts of the work while your decisions bind the platform for years to come.
Requirements
- 10+ years of professional engineering experience, with a demonstrated track record as a Staff or Principal engineer who has shaped platforms, APIs, or developer tooling used by external builders
- Deep expertise in designing and shipping public APIs and SDKs, including versioning strategy, backwards compatibility, and developer ergonomics
- Expert-level proficiency in JavaScript/TypeScript and React
- Hands-on experience building CLI tooling and local developer workflows (scaffolding, hot reload, file-based config, deploy commands)
- Solid understanding of the Model Context Protocol (MCP) or equivalent agentic tool-use interfaces, and practical experience building tools that AI agents can reliably invoke
- Experience building systems at global scale on cloud infrastructure (AWS or GCP), with deep knowledge of containerization, CI/CD, and infrastructure-as-code
- Ability to write and reason about LLM-friendly documentation and API surfaces
- Exceptional technical communication: clear RFCs and ADRs, productive architecture reviews
- Comfort operating in a greenfield context
Responsibilities
- Own the technical architecture of the agent-readable Shop Builder platform: which APIs to expose, in what shape, through which surfaces (REST, SDK, MCP, CLI)
- Define the interface contracts that LLMs and developers interact with — React component APIs, custom block schemas, theme tokens, data binding formats — and maintain them with the rigor of a public API
- Design and lead delivery of the MCP server that allows AI agents to build, deploy, and operate Shop Builder storefronts end-to-end without the editor in the loop
- Architect the CLI and local development environment: how developers scaffold projects, iterate locally, preview changes, and push to production
- Define the deploy, versioning, and rollback model for developer-published content — custom blocks, themes, and layouts
- Design the sandbox and preview environment system so agents and developers can iterate without touching live partner sites
- Set the documentation standard: written for LLMs and humans as first-class users, maintained from single canonical sources and published to every surface
- Lead the eval harness architecture: how the team measures whether an LLM-generated block, theme, or layout is correct before it ships
- Collaborate with Principal/Staff Engineers across payments, auth, live ops, and catalog to pull inbound capabilities into coherent developer-facing surfaces
- Serve as the technical bar-raiser for the team: define code standards, review critical implementation decisions, and mentor the Tech Lead and engineers
- Contribute to hiring and define the technical culture of the team from day one
Benefits
- Medical, dental, and vision insurance
- PTO
- Personalized career roadmap
- Professional development through training and educational opportunities