Software Engineer, Trust & Safety

• Resend is growing fast, and there are now over 4 million developers using it. We’re building tools that make email better for developers. We care about dependable infrastructure, thoughtful design, and the experience of everyone building with our products.
• In this role you'll build the anti-abuse systems that keep Resend open for good senders and closed to bad actors: real-time enforcement on every email, detection pipelines that scale with the platform, and automations that go from detection to action without waiting on a human.
• This role is fully remote based in Americas or European timezones, with some expected travel for team offsites, conferences, meetups, and more.
• Read more about how we work, how we hire, and what we value here https://resend.com/handbook.

IN THIS ROLE, YOU WILL…

• - 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
• YOU’LL BE A GREAT FIT IF YOU… - Bring 5+ years of software engineering experience - Are fluent in writing and speaking English - Have deep experience with Node.js, TypeScript, React (Hono, Next.js) - Write Go, or want to, for latency-sensitive services - Have infrastructure and reliability skills (AWS, CDK, Datadog) - Are 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 - Have proven experience with databases (Postgres, Redis)
• YOU WILL BE AN EXCEPTIONAL FIT IF YOU ALSO...
• - Have worked in trust and safety, fraud or security - Have built real-time enforcement such as rate limiting, or a rules engine on a policy language like CEL - Have 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 - Have knowledge of database performance tuning (Postgres, Redis)
• WHAT IT MEANS TO JOIN THE TEAM:
• - 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
• LEARN MORE ABOUT HOW WE WORK:
• - Our philosophy for anti-abuse https://resend.com/handbook/support/what-is-our-philosophy-for-anti-abuse - $3M to make email safer https://resend.com/blog/3-million-to-make-email-safer - Revoking leaked API keys with GitHub secret scanning https://resend.com/changelog/github-secret-scanner
• ABOUT RESEND
• We are building the modern email sending platform for developers. We care deeply about quality, craft, and the developer experience.
• Our fully remote team of 50 spans 15 countries and counting. We're backed by a16z, Y Combinator, and others. Meet the humans → https://resend.com/humans