Senior Software Engineer

Software Engineer

Location: Germany | Remote | Full-time

A well-funded, early-stage cybersecurity company is looking for a Software Engineer — Agent Guardrails to own the runtime instrumentation layer that enables real-time security and policy enforcement for AI agents.

This is a highly technical opportunity focused on building the sensors that observe what AI agents are doing at runtime , generating events that allow the policy engine to make real-time block or allow decisions.

You’ll design and build low-latency runtime instrumentation across Node.js and Python , develop hooks for emerging AI protocols and SDKs such as MCP, and build tooling that automatically detects changes in fast-moving third-party dependencies.

Ideal candidates will have:

• Strong production experience with Node.js and Python

• Hands-on experience with dynamic module loading, monkey-patching, hooks, interceptors, and runtime instrumentation

• Strong understanding of asynchronous execution, including asyncio and the Node.js event loop

• Experience working with FFI and compiled languages such as Rust, C, or C++

• Understanding of memory management, thread safety, and dynamic linking

• Experience building resilient software on top of fast-evolving third-party SDKs and runtimes

• Strong debugging skills, including race conditions, memory leaks, and silent runtime failures

• Experience designing low-latency, performance-sensitive systems

• Strong ownership mentality and ability to work independently in an early-stage environment

Desirable Experience:

• AI agent infrastructure and LLM SDKs

MCP (Model Context Protocol) or other emerging AI protocols

• Runtime security, application security, or cybersecurity

• Web frameworks and execution transports

• Observability, tracing, instrumentation, or developer tooling

• Experience working with rapidly evolving open-source ecosystems

Key Words:

Software Engineer / Systems Engineer / Runtime Engineer / Security Engineer / Python / Node.js / JavaScript / TypeScript / Runtime Instrumentation / Monkey Patching / Interceptors / Hooks / Asyncio / Node Event Loop / FFI / Rust / C / C++ / Dynamic Linking / Memory Management / Thread Safety / AI Agents / LLM / LLM SDK / MCP / Model Context Protocol / Runtime Security / Application Security / Cybersecurity / Observability / Distributed Systems / Performance Engineering

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