Software Engineer

Description

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 the company 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 .

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)

Responsibilities

• 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
• Revoking leaked API keys with GitHub secret scanning
• About the company
• We are building the modern email sending platform for developers. We care deeply about quality, craft, and the developer experience.
• Meet the humans →