[Hiring] Software Engineer, Trust & Safety @Resend

Role Description

In this role you'll build the anti-abuse systems that keep Resend open for good senders and closed to bad actors:

• Build and run the real-time enforcement layer within a latency budget of milliseconds
• Design pipelines that move from signal to decision to action, across sending, receiving and account activity
• Build the detection rules and policies that decide when we act, and make them safe to change
• Detect and contain account takeover and leaked API keys: notice when a trusted account stops acting like itself, and stop the damage without locking out the real owner
• Close the feedback loop: every block and every reversal carries a reason, so we can measure each detection's precision and retire the ones that hurt good senders
• Automate manual work such as investigations, appeals and bulk actions, so the team keeps up as volume grows
• Build and evaluate ML classifiers for spam and phishing, and prove their precision before they enforce anything
• 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

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, and treat a false positive as a bug
• 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)

Requirements

• 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, and know how to measure its precision and recall
• 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
• A high bar for product quality, reliability, and the details that make software enjoyable to use
• Comp: $150,000 - $175,000 USD, commensurate with location and experience