Senior Full-Stack Developer

Role Description

We're looking for a full-stack developer to help build the product surface of cside — the dashboard, APIs, and customer-facing tooling that turn billions of raw browser signals into something a security engineer can act on in seconds. You'll work close to the data and close to the customer, shipping quickly against a genuinely hard technical problem.

• Build and ship features across the stack, from API endpoints to the dashboard our customers live in every day.
• Design and implement APIs that serve high-volume, low-latency security telemetry.
• Work with our real-time data pipeline to surface detections clearly, without drowning users in noise.
• Turn complex security signals into interfaces that make the right action obvious.
• Own features end to end: design, implement, test, ship, measure, iterate.
• Improve performance and reliability of systems processing signals at scale.
• Contribute to code review, technical design, and the engineering standards we hold each other to.
• Partner with product and security research to take detections from prototype to production.

Qualifications

• 5+ years building production web applications, with real ownership of what you shipped.
• Strong TypeScript, and comfort on both sides of the stack (React on the front, Node or similar on the back).
• Experience with real-time or high-volume data systems, and an instinct for where they break.
• You care about performance and can explain why something is slow, not just that it is.
• Comfortable with ambiguity; you scope your own work and ship without waiting to be told.
• You write clearly — code, review comments, and design docs alike.
• Genuine interest in web security; you don't need to be an expert, but you should want to become one.
• Based in the United States and authorized to work here, with at least 4 hours of daily overlap with US Pacific hours.
• Excited to travel for 2-3 company offsites per year.

Benefits

• Quarterly offsite.
• Generous work from home allowance.
• Latest Macbook.
• Stock options.
• Market rate salary (seed stage).
• Take what you need PTO.