# AI Security Researcher/Research Engineer

**Company:** [Brave](https://hotfix.jobs/companies/brave)
**Location:** London, United Kingdom
**Role:** AI Research
**Skills:** Python, PyTorch, JAX, LLMs, Web Agents, Prompt Injection, Security Guardrails, Fine-Tuning, Information Flow Control, Access Control, Confidential Computing, Zero-Knowledge Proofs, Smpc, Adversarial Evaluation, Privacy
**Posted:** 2026-08-29

> Research and engineer security measures for LLM-powered web agents and chatbots, including adversarial testing, secure architectures, model evaluation, and security-focused training. The role requires strong Python and ML expertise, AI security experience, and preferably a computer science Ph.D.

## Job Description

## Responsibilities
- Design and execute adversarial evaluations to uncover failure modes in LLM-powered web agents and chatbots, including prompt injection, tool abuse, and data exfiltration.
- Analyze model behavior, including internal thoughts, to understand and forecast security risks in frontier models.
- Develop and prototype security-focused training and fine-tuning techniques.
- Augment web agents with security principles such as information-flow control, privilege control, and contextual security.
- Partner with engineering, privacy, machine learning, and cryptographic researchers to translate findings into product changes, tests, and measurable security improvements.
- Help define security strategy and policy for building and responsibly releasing web agents, with a focus on user protection.

## Requirements
- Demonstrated experience with secure AI, including prompt-injection attacks and security guardrails.
- Strong publication record in AI security, ML security, or closely related areas.
- Track record of shipping products and features in a fast-moving environment.
- Strong Python coding skills and familiarity with ML frameworks such as PyTorch or JAX.
- Experience training, fine-tuning, and evaluating large language models.
- Deep familiarity with large language models and web agents, including how they work and are trained.
- Experience applying security principles such as information-flow control and access control/least privilege.
- Demonstrated ability to bring clarity and ownership to ambiguous technical problems.
- Ph.D. in computer science highly preferred; exceptions may be considered for candidates with industry experience.

## Nice-to-haves
- Knowledge of AI-system pipelines and security evaluation.
- Open-source projects focused on security or privacy.
- Experience with confidential computing and ZKP/SMPC protocols.
- Ph.D. in computer science from a top-tier school.
- Strong publication record in premier systems, performance, or machine-learning venues.
- Industry work experience.

## Similar jobs

- [AI Researcher](https://hotfix.jobs/jobs/077574a5-3c6d-4634-a23c-4a909ce8aa65) - Improbable - Remote
- [AI Systems Researcher/Engineer](https://hotfix.jobs/jobs/d9004c6b-d0c2-4312-bf39-dfe435142371) - Brave - London, United Kingdom
- [Mercor Research Fellowship - APEX](https://hotfix.jobs/jobs/87b84beb-0193-4421-adbe-4b113a41781e) - Mercor - Remote - $40k – $80k/yr
- [AI Research Engineer](https://hotfix.jobs/jobs/001a2b85-2821-4e69-874c-5fce857cae7c) - PostHog
- [Research Scientist - Member of Technical Staff](https://hotfix.jobs/jobs/9807d0a2-a252-48f0-81fa-2175608c94b8) - AI Digest - Remote - $150k – $350k/yr

**Apply:** https://hotfix.jobs/jobs/7e985248-4c13-4e17-8143-9d2817fe8c09
**Canonical:** https://hotfix.jobs/jobs/7e985248-4c13-4e17-8143-9d2817fe8c09