# Staff Software Engineer, Risk

**Company:** [Replit](https://hotfix.jobs/companies/replit)
**Location:** Foster City, CA
**Role:** Security Engineering
**Salary:** $250k – $315k/yr
**Experience:** 8+ years
**Skills:** Python, TypeScript, SQL, BigQuery, Machine Learning, Llm Guardrails, Prompt Injection Detection, Security Engineering, Fraud Detection, GCP, Kubernetes, SAST, Sca
**Posted:** 2026-05-26

> Build and operate AI-powered abuse detection systems that defend Replit's platform from phishing, cryptomining, LLM token farming, and other attacks. Own end-to-end detection, investigation, and automated response across millions of daily actions.

## Job Description

## Responsibilities
- Design and implement LLM guardrails that detect abuse scenarios in AI-generated code and agent interactions
- Build AI-powered detection systems that use LLMs to identify malicious patterns, classify threats, and automate response decisions
- Build and operate abuse detection systems that identify phishing, cryptomining, account takeover, and financial fraud across millions of daily user actions
- Design automated response mechanisms that enforce platform policies without manual intervention
- Own the full abuse response lifecycle: detection, investigation, enforcement, and handling appeals alongside Support and Legal
- Analyze attack patterns using BigQuery and Hex, turning investigation findings into new detection rules
- Maintain and extend internal detection tools (Slurper, Netwatch) that continuously monitor user activity
- Integrate and tune security scanners (SAST, SCA) in CI pipelines with tight performance SLAs
- Track abuse trends, measure detection effectiveness, and adapt defenses as attack patterns evolve

## Requirements
- 8+ years of experience in security engineering, anti-abuse, trust & safety, or fraud detection
- Strong programming skills in Python and/or TypeScript for building detection systems and automation
- Experience with SQL and data analysis at scale (BigQuery, Snowflake, or similar)
- Experience building or fine-tuning ML/LLM-based classifiers for security or abuse detection
- Familiarity with prompt injection, jailbreaking, and other LLM-specific attack vectors
- Ability to investigate complex abuse patterns and translate findings into automated defenses
- Familiarity with common attack patterns: phishing infrastructure, account takeover, credential stuffing, resource abuse
- Clear communication skills for working across Security, Support, Legal, and Engineering teams

## Nice to Have
- Experience at a platform company dealing with user-generated content or compute abuse (hosting providers, cloud platforms, developer tools)
- Background in fraud detection, payment abuse, or financial crime
- Familiarity with device fingerprinting, IP reputation, and email validation services
- Experience with CI/CD security tooling (SAST, SCA, Dependabot, Snyk)
- Knowledge of container security, Linux internals, or cloud infrastructure (GCP preferred)
- Prior work with abuse reporting pipelines, trust & safety tooling, or content moderation systems

## Tools & Tech Stack
- Languages: Python, TypeScript, Go, SQL
- Data: BigQuery, Hex
- Detection tools: Slurper, Netwatch, Stytch (device fingerprint); ClearOut (email reputation)
- CI/CD Security: Dependabot, Snyk, SAST/SCA scanners
- Infrastructure: GCP, Kubernetes

## Similar roles

- [Staff Software Engineer, Fraud](https://hotfix.jobs/jobs/aa86d79c-af69-4a6a-bdd8-8bd480bb43a9) - Replit - Foster City, CA - $250k – $315k/yr
- [Staff Software Engineer, Trust & Safety](https://hotfix.jobs/jobs/b088358f-42cf-4983-9717-f6c60abcc9e7) - Replit - Foster City, CA - $250k – $315k/yr
- [Staff Incident Responder](https://hotfix.jobs/jobs/f9dd71bf-90d8-4885-a743-deed513fd41c) - Fluidstack - San Francisco, CA - $250k – $350k/yr
- [Staff Product Security Engineer](https://hotfix.jobs/jobs/79405bb0-9cc6-4690-8bb5-f9c43867f6f6) - Crusoe - San Francisco, CA - $250k – $285k/yr
- [Staff Software Engineer, Platform Security](https://hotfix.jobs/jobs/f9f68913-83ff-44d8-b357-749b29f4c55f) - Discord - Remote - $248k – $279k/yr

**Apply:** https://hotfix.jobs/jobs/5cc2b135-9342-4987-9b19-269e001150fe
**Canonical:** https://hotfix.jobs/jobs/5cc2b135-9342-4987-9b19-269e001150fe