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cside is a web security company that uses browser intelligence and AI to detect sophisticated web threats—from malicious JavaScript execution to account takeovers and fraudulent account creation. The company has raised $7.7M in pre-seed and seed funding and is trusted by major brands across universities, e-commerce, fintech, SaaS, crypto, and travel sectors.
As a Senior Full-Stack Developer, you'll build the product surface that transforms billions of raw browser signals into actionable security intelligence. You'll own features end-to-end: designing and shipping APIs that handle high-volume, low-latency telemetry; building React dashboards that customers use daily; and working with real-time data pipelines to surface detections clearly without overwhelming users.
Key responsibilities include:
- Building and shipping full-stack features from API endpoints to customer-facing dashboards
- Designing APIs that serve high-volume, low-latency security telemetry
- Turning complex security signals into intuitive interfaces that make the right action obvious
- Owning features end-to-end: design, implementation, testing, shipping, measurement, and iteration
- Improving performance and reliability of systems processing signals at scale
- Contributing to code review, technical design, and engineering standards
- Partnering with product and security research teams to move detections from prototype to production
You bring 5+ years of production web application experience with real ownership of shipped work. You're strong in TypeScript across both React (frontend) and Node.js (backend). You have experience with real-time or high-volume data systems and understand performance bottlenecks. You scope your own work, ship without waiting for direction, and write clearly in code, reviews, and design docs. While you don't need to be a security expert, you're genuinely interested in learning the domain. You're based in the US with authorization to work, maintain at least 4 hours daily overlap with US Pacific time, and are willing to travel for 2-3 company offsites annually.
cside offers market-rate seed-stage compensation, stock options, quarterly offsites in tropical locations, a generous work-from-home allowance, latest MacBook, and flexible PTO. The team is invested in long-term career development and celebrates equal opportunity regardless of background.
