Senior Software Engineer, Fraud

Replit, Inc.

Job Overview

Location

Foster City, CA

Job Type

Full-time

Full Job Description

📋 Description

• Senior Software Engineer on the Fraud team at Replit, defending the platform from exploitation by detecting and shutting down phishing deployments, cryptomining, LLM token farming, and other abuse scenarios in an AI-native environment.
• Design and implement LLM guardrails, build AI-powered detection systems, operate abuse detection systems across millions of daily user actions, design automated response mechanisms, own the full abuse response lifecycle, analyze attack patterns using BigQuery and Hex, maintain internal detection tools, integrate and tune security scanners in CI pipelines, and track abuse trends to adapt defenses.
• Replit is the agentic software creation platform enabling anyone to build applications using natural language, with millions of users worldwide, democratizing software development by removing traditional barriers to application creation.
• Opportunity to work on unique AI-native security problems such as detecting prompt injection and using LLMs defensively, gain hands-on experience applying AI to security in production with real attackers, own problems end-to-end, and collaborate closely with Security, Support, Legal, and Engineering teams.

🎯 Requirements

• 4+ 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

🏖️ Benefits

• Competitive Salary & Equity
• 401(k) Program with a 4% match (US Only)
• Health, Dental, Vision and Life Insurance
• Short Term and Long Term Disability
• Paid Parental, Medical, Caregiver Leave
• Flexible Time Off (FTO) + Holidays
• Commuter Benefits (In-Office Only)
• Monthly Wellness Stipend
• Autonomous Work Environment
• In Office Set-Up Reimbursement (In-Office Only)
• Quarterly Team Gatherings
• In Office Amenities (In-Office Only)

Skills & Technologies

Python

TypeScript

GCP

Kubernetes

Linux

Senior

Onsite

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Replit, Inc.

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About Replit, Inc.

Replit is an online, collaborative, integrated development environment (IDE) that allows users to write, run, and share code in numerous programming languages directly from their web browser. It provides a cloud-based platform, eliminating the need for local setup and dependencies. Replit supports real-time collaboration, enabling multiple users to code together simultaneously on the same project, making it ideal for educational purposes, team projects, and rapid prototyping. The platform offers a vast array of features including version control integration, package management, and deployment tools, democratizing software development for beginners and experienced programmers alike.

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