? At NeuralTrust, we’re looking for a Security Engineer (Product Security) to build the security core of our platform, turning emerging AI threats into production-grade defenses that protect enterprise AI agents at scale. Join us!

About NeuralTrust

We’re a Barcelona-based startup that is rapidly scaling globally to become a leader in AI agent security. Our platform enables organizations to secure agent systems, covering both exposure management and runtime security.

Backed by leading European investors and collaborating with top Spanish universities, NeuralTrust operates at the intersection of cybersecurity and AI.

What You Will Do

As Security Engineer, you will play a central role in designing, building, and hardening the security capabilities of our product, bridging AI security research, customer needs, and engineering execution.

You will

- Design and build security features for our Agent Gateway and Agent Runtime Security products, including prompt injection defenses, data loss prevention, tool and MCP access controls, and policy enforcement.
- Turn research on emerging AI threats (jailbreaks, indirect prompt injection, tool misuse, data exfiltration) into reliable, low-latency production defenses.
- Build and harden authentication, authorization, and identity flows for AI agents and the tools they connect to.
- Lead threat modelling and secure design reviews for new features, partnering with Engineering to catch issues early.
- Work with our AI security researchers and ML team to improve detection quality and reduce false positives.
- Own security across the SDLC for the products you touch: code review, dependency scanning,



secrets management, and secure CI/CD.
- Support enterprise customers on technical security questions and help respond to reported vulnerabilities.
- Stay on top of evolving AI and security trends and bring new protection ideas into the product.

About You

We’re looking for a hands-on security engineer with strong technical fundamentals, a builder’s mindset, and a passion for securing the next generation of AI systems.

- 3–5 years of experience in product security, application security, or security-focused software engineering
- Strong coding skills in at least one backend language (Go or Python preferred).
- Knowledge of web and API security: OWASP Top 10, OAuth/OIDC, JWT, and secure API design.
- Knowledge of cybersecurity processes like threat modelling, secure code review, and incident response.
- Experience building or securing cloud-native systems (AWS, GCP, or Azure; Docker, Kubernetes).
- Interest in LLMs and AI agents. Hands-on experience with agent frameworks, MCP, or the OWASP Top 10 for LLMs is a strong plus.
- Strong hands-on execution capabilities: you prefer shipping the control over writing the report.
- Excellent communication skills, with the ability to engage both technical and business audiences.
- Based in Spain or the EU (remote role).

Benefits

- Competitive salary aligned with your experience and impact.
- Work alongside a high-performing, international team.
- Remote setup across Spain and the EU, with our Barcelona HQ as a hub for team time.
- Exposure to cutting-edge AI and enterprise-scale deployments.
- Be part of one of the most exciting AI startups in Europe.

📌 Security Engineer (Barcelona)
🏢 NeuralTrust
📍 Barcelona