Software Engineer, Trust & Safety

The role

You will build anti-abuse systems including real-time enforcement, detection pipelines, and automations. This involves building ML classifiers and managing account security to keep the platform open for good senders.

What you will do

• Build and run the real-time enforcement layer within a latency budget of milliseconds
• Design pipelines that move from signal to decision to action
• Build the detection rules and policies that decide when to act
• Detect and contain account takeover and leaked API keys
• Close the feedback loop to measure detection precision
• Automate manual work such as investigations, appeals and bulk actions
• Build and evaluate ML classifiers for spam and phishing
• Implement safeguards and make every action traceable through logs, metrics and audit trails
• Ensure all enforcement actions are traceable with logs, metrics, and audit trails

Required qualifications

• 5+ years of software engineering experience
• Fluent in writing and speaking English
• Deep experience with Node.js, TypeScript, React (Hono, Next.js)
• Write Go, or want to, for latency-sensitive services
• Infrastructure and reliability skills (AWS, CDK, Datadog)
• Comfortable with APIs, event-driven architectures, queues and stateful services
• Design systems that fail safe
• Care deeply about observability: metrics, logs, tracing, error handling
• Take ownership across the stack, from frontend surfaces down to databases and queues
• Proven experience with databases (Postgres, Redis)

Nice to have

• Worked in trust and safety, fraud or security
• Built real-time enforcement such as rate limiting, or a rules engine on a policy language like CEL
• Shipped ML or LLM-based detection in production
• Know email: SPF, DKIM, DMARC, bounces, complaints, and how phishing campaigns work
• Knowledge of database performance tuning (Postgres, Redis)

Benefits

• Room to shape technical decisions and take projects from discovery through production
• Work remotely with teammates around the world
• Close collaboration with the developers who use what you build
• Teammates who value thoughtful feedback, shared learning, and care for each other

About the company

Resend is building the modern email sending platform for developers. They care about dependable infrastructure, thoughtful design, and the developer experience.