Senior Software Engineer, Core Frameworks & Protocols (Open-Source)

About Us

CopilotKit is the #1 open-source platform for connecting AI Agents with user-facing applications. In our first two years, we've delivered the fastest growing Javascript AI framework of all time, and built a vibrant community (40k+ GitHub stars, millions of weekly installs, 10s of millions of copilot interactions, double-digit MoM growth), are already monetizing at the enterprise level, and are used by companies ranging from startups to Fortune 100s (including production usage by over 10% of Fortune 500s).

We're emerging as the default for a critical part of the AI stack: the agent/user interaction layer. CopilotKit brings agents out of demos and terminals and into production, through deep integrations with the leading AI infrastructure companies and hyper-scalers (including the leading AI/infra teams at Google, Microsoft, Amazon, Oracle, LangChain, Mastra, Pydantic, Agno, and others).

The Role

You'll build the core infrastructure powering the next generation of AI-native applications. This is a deeply technical role designing TypeScript & Python SDKs, real-time systems, and developer-facing abstractions used by tens of thousands of engineers.

You'll work upstream of our headless UI layer, collaborating with leading AI infrastructure teams and hyperscalers to make integrating AI copilots seamless. You'll own systems end-to-end and help shape how production-grade AI agents interact with users.

What You'll Do

• Design high-quality TypeScript & Python SDKs that elegantly abstract complexity while preserving control
• Build reusable components and maintain clean, intuitive APIs
• Drive projects independently through ambiguity with strong technical judgment
• Contribute to our open-source ecosystem and engage with our developer community
• Optimize performance and ensure scalability at production scale

What We're Looking For

• Track record building developer tools, SDKs, or libraries used by engineering teams
• Deep TypeScript expertise (3+ years) with React and Node.js experience
• Experience designing clean APIs and navigating fast-moving, ambiguous environments
• AI-native workflow: You actively use AI tools (Copilot, Cursor, Claude, etc.) for architecture exploration, refactoring, and rapid prototyping
• Clear communication and high degree of independence

Bonus Points

• React infrastructure work, LLM integration, or AI product surfaces
• Python experience, open-source contributions, or functional reactive programming
• Experience with agent runtimes, real-time systems, or maintaining public APIs

Why Join Us

• Work on foundational AI tech: Build the infrastructure powering the next wave of user-facing, AI-native applications
• Ship from zero-to-one
• Be surrounded by top talent
• Open-source impact with engaged developer community
• Competitive salary and real equity
• 100% health coverage for employees, 50% for dependents
• Remote-first, high-agency culture