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About the Role

We are building the agent runtime that finds, validates, and prepares fixes for vulnerabilities automatically, while people retain judgment and merge control. This involves solving real distributed-systems and reasoning problems.

Responsibilities

• Build and harden Nullify's multi-provider agent runtime, including loops, structured output, budget governance, and checkpoint/resume for multi-hour runs.
• Design agents that reason about business logic and real application behavior, moving beyond simple pattern matching.
• Build and grow the evaluation harness, encompassing labelled test cases, scoring, and regression tracking.
• Own agents end-to-end, covering detection, validation, fix generation, and intermediate judgment calls.

Requirements

• Strong software engineering fundamentals in Go or Python.
• Experience with production systems, not just notebooks.
• Experience building or operating LLM-based agents beyond single prompt-response calls, including tool use, multi-step reasoning, retries, and evaluations.
• A scientific approach to measuring effectiveness before deployment.
• Genuine interest in security and a desire to become an expert.

Skills

• Go
• Python
• LLM-based agents
• Tool use
• Multi-step reasoning
• Retries
• Evaluations
• Security