What We're Looking For

• You've shipped libraries or SDKs that other developers depend on, and supported them through breaking changes.
• You've kept one API consistent across at least two languages. You write idiomatic Python and TypeScript; Go or Ruby is a plus.
• You know OAuth 2.0 and OIDC at the library level: token verification, refresh, PKCE, and token exchange (RFC 8693).
• You've managed versioning in the real world: peer dependency ranges, maintenance branches, and deprecations users could plan around.
• You've built framework integrations or protocol libraries, and can work through MCP's authorization flows and compatibility changes.

Strong Candidates May Also Have

• Code generation for multi-language SDKs: Stainless, Speakeasy, Fern, OpenAPI, or protobuf.
• Plugin or integration ecosystems, like Terraform providers, framework adapters, or editor extensions.
• Contributions to MCP, the A2A protocol (which we support in preview), or open source agent frameworks.
• Edge runtimes like Cloudflare Workers, or durable execution like Temporal.

Your First 90 Days

• Close the biggest gaps between the TypeScript and Python SDKs, toward dropping TypeScript's preview label.
• Publish a cross-language API guide: names, errors, and credential types, mapped across Python, TypeScript, Go, and Ruby.
• Take one upstream breaking change, like a new MCP SDK major or framework release, from nightly failure to released support.
• Agree an SDK roadmap with product and engineering, including where generated clients end and handwritten SDKs begin.

Who Will Love This Job

• You care about the first ten lines a developer writes with your library.
• You'd rather design an API once than explain it four different ways.
• You use coding agents every day, and you know which of their changes need a closer look.

What We Offer

• Build at the Frontier: Work every day at the frontier of agent-native systems — shipping, inventing, and iterating on technology that hasn’t been built before. You’ll be given huge autonomy, the opportunity to gain mastery, and the chance to work in a team that holds each other accountable to succeed.
• Truly Agent-Native Culture: At Keycard, we don’t just enable others to adopt agents — we use them ourselves to build. You’ll help shape an organization that embeds AI into its foundation as an enduring competitive advantage.
• Compensation With Upside: Market-competitive salaries and generous equity packages (4-year vest, 1-year cliff) give you the security to focus on building — and the asymmetric upside of ownership in a company chasing a category-defining mission.
• Comprehensive Benefits & Recharge: Health, dental, vision, and paramedical coverage for you and your family, plus 4 weeks vacation, 11 statutory holidays, and 1 volunteer day annually. We encourage at least 2 weeks off each year to fully recharge.
• Tools That Keep You Ahead: A new MacBook Pro, a $500 stipend for peripherals, and the best AI tools available so you can work at the forefront of agent-native workflows.
• Remote-First Flexibility: We are a remote-first team prioritizing asynchronous collaboration, with hiring focused in North and South America. Work where you’re strongest — we just want the best.