Senior Software Engineer

SR2 | Socially Responsible Recruitment | Certified B Corporation™; Amsterdam; On-site; EUR 70,000 - 100,000; Full time

Job summary

Confidential Offensive Cybersecurity Startup is seeking a Software Engineer to join its AI team, building AI hacking agents and agentic security products. You will develop systems capable of autonomously carrying out offensive security tasks, taking projects from idea through development and deployment.

You will own features end-to-end, work on cutting-edge AI and security integrations, and ship quickly within a fast-paced startup environment.

Qualifications

• 3+ years of software engineering experience.
• Experience building and maintaining production-grade Python systems.
• Hands-on experience with LLM APIs.
• Strong ownership and ability to work independently.
• Comfortable with ambiguous, high-impact projects.
• Startup/scale-up mindset with bias toward shipping quickly.

Responsibilities

• Build and optimise AI agents capable of performing offensive security tasks.
• Develop LLM applications, agent harnesses, APIs and data models.
• Evaluate agent performance using real-world security testing.
• Debug and improve AI systems in production.
• Respond to production issues and improve system reliability.
• Experiment quickly, learn from results and continuously improve the product.

Skills

Python

LLM APIs

AI agents

Ownership

Startup mindset

Autonomous systems

Tools

LangGraph

LangChain

PydanticAI

TypeScript

Go

C#

Kubernetes

AWS

GCP

Job description

Confidential Offensive Cybersecurity Startup

About the Company

A rapidly growing offensive cybersecurity startup is using AI agents to transform automated security testing.

The company is developing an autonomous Threat Exposure Management platform that continuously maps organisations' digital attack surfaces, identifies vulnerabilities and helps security teams prioritise remediation.

With a growing international team and backing from established venture investors, the business is scaling its AI and cybersecurity capabilities.

The Role

They are looking for a Software Engineer to join their AI team, working on advanced AI hacking agents and agentic security products.

You'll combine strong software engineering with cutting-edge AI, building systems capable of autonomously carrying out offensive security tasks.

The role offers significant end-to-end ownership, taking projects from initial idea through development, deployment and continuous improvement.

Key Responsibilities

• Build and optimise AI agents capable of performing offensive security tasks
• Develop LLM applications, agent harnesses, APIs and data models
• Evaluate agent performance using real-world security testing
• Debug and improve AI systems operating in production
• Respond to production issues and improve system reliability
• Experiment quickly, learn from results and continuously improve the product

What They're Looking For

• 3+ years' software engineering experience
• Experience building and maintaining production-grade Python systems
• Hands-on experience working with LLM APIs
• Strong ownership and ability to work independently
• Comfortable working on ambiguous, high-impact projects
• Startup/scale-up mindset with a bias towards shipping quickly

Nice to Have

• Experience building AI agents / agentic systems
• LangGraph, LangChain or PydanticAI
• TypeScript, Go or C#
• Kubernetes, AWS or GCP
• Offensive security / ethical hacking experience
• Open-source AI contributions
• AI research or conference experience
• Experience building AI products within a startup or scale-up

Location

Why Join?

This is a particularly interesting opportunity for a Software Engineer who wants to work at the intersection of:

AI + LLMs + Autonomous Agents + Software Engineering + Cybersecurity

Rather than simply building another LLM application, you'll be developing AI systems capable of performing real-world offensive security tasks and helping push the boundaries of autonomous hacking.