Senior JavaScript Engineer

Join us and be an essential part of the team that powers the intelligence behind HUMANs defense against online threats - helping to keep the internet human!What you'll do:Drive the design, development, and optimization of advanced JavaScript techniques to collect signals (user behavior, device characteristics, browser APIs) securely and efficiently.Own the full code lifecycle: architecture, development, deployment, monitoring, and continuous improvement.Collaborate closely with Product, Research, Security, and Engineering teams to align technical execution with broader product goals.Requirements: 4+ years of hands-on software development experience, with deep expertise in vanilla JavaScript and browser internals.Strong understanding of web security concepts, browser APIs, and the nuances of cross-platform development.A JavaScript enthusiast who enjoys being hands-on: reviewing code, setting architecture and contributing to complex solutions.Experience with typed backend languages (e.g., Go, Java).Excellent communication and collaboration skills, with the ability to work effectively across disciplines.Passionate about performance, security, and crafting elegant technical solutions.Nice to have:Familiarity with content delivery networks (CDNs) and large-scale deployment strategies.Background in cybersecurity, bot mitigation, or fraud prevention technologies.This position is open to all candidates.