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# Software Engineer

- **Company:** Keycard Labs Inc.
- **Location:** United States (Remote available)
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Systems Engineering, Audit Trail, Cloud Computing, Code Generation, Protocol Buffers, Python (Programming Language), OAuth, Open Source Technology, OpenID, TypeScript, Openapi, Rust (Programming Language), Multi-Agent Systems, Stripe, Terraform, Golang
- **Published:** September 4, 2026
- **Apply:** https://startup.jobs/software-engineer-sdk-keycard-labs-8142215

## About the Role

* You follow the agent ecosystem closely - you build with these tools and have opinions about what works, what doesn't, and when to use which framework.
 * Strong systems engineering instincts. You write tests, think about backwards compatibility, version correctly, and care about API surface area.
 * You've built libraries or SDKs that other developers depend on. You understand the difference between building a product and building a tool others build products with.
 * You work across multiple languages without treating any of them as second-class.

Strong candidates may also have

 * Experience with plugin systems, provider architectures, or marketplace/ecosystem engineering (Terraform providers, VS Code extensions, Stripe integrations, etc.)
 * Contributions to open source agent frameworks or protocols
 * Background in identity/auth protocols (OIDC, OAuth, mTLS) at the library level
 * Experience with code generation tools (OpenAPI, protobuf, smithy) for multi-language SDK maintenance

## Description

We're hiring an engineer to join the team that builds and owns the Keycard Agent SDK - the libraries that bring trust, governance, and telemetry to AI agents in production.

Keycard is a control plane for agents: policy enforcement, identity propagation, audit logging, and runtime governance. The SDK is how developers use it. It needs to work across languages (Go, Python, TypeScript, Rust), agent frameworks, and deployment patterns (cloud, edge, hybrid).

You'll build the SDK libraries, maintain compatibility with upstream frameworks, contribute to open protocol work (MCP, A2A), and advocate for what agent developers actually need. You'll work directly with founders, product, and the systems engineers building the underlying services.


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