Senior Software Developer developing systems that accurately record financial transactions at Wealthsimple, Canada's largest fintech. Designing ledger infrastructure and collaborating with finance and product teams.
About the role
- Principal Engineer architecting Xsolla's agent-readable Shop Builder platform. Defining APIs and interfaces crucial for developer and AI agent interactions.
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 (Claude Code, Cursor, etc.) 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 (CLI help, dev docs, MCP tool descriptions, AI context).
- 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.
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 — strong opinions about what makes an API delightful vs. painful.
- Expert-level proficiency in JavaScript/TypeScript and React — the primary interface language for LLMs and developers on this platform.
- 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: you understand that token-efficiency, predictability, and schema clarity matter as much as human readability.
- Exceptional technical communication: clear RFCs and ADRs, productive architecture reviews, and the ability to explain second-order consequences to engineering and business leadership.
- Comfort operating in a greenfield context — you define the structure rather than inherit it.
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.
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