Senior Software Engineer - Application Security

Emergent builds autonomous coding agents that replace traditional software development by generating, testing, and deploying production applications directly from plain-language intent. Our systems run in production at global scale and are used to build millions of real applications. Since our public launch, we've crossed $130M in ARR and grown to over 10M users across 190+ countries, who have built 12M+ applications on Emergent. We're backed by Creaegis, Claypond, Sentinel Global, Khosla Ventures, SoftBank, Google, Lightspeed, Prosus, Together, and Y Combinator. We're solving the hard part of AI-driven software creation: correctness, reliability, security, and scale in real production systems. The team is built by repeat founders, Olympiad medalists, IIT & IIM alumni, and leaders from Google, Amazon, and Dropbox. We're hiring builders who want ownership, speed, and impact at global scale. The Role: Emergent runs a massive, multi-tenant, AI-driven execution environment where code is generated and executed continuously. You will secure the infrastructure that powers autonomous software creation. What You'll Do: What You’ll Do Secure AI-generated applications at scale • Define security patterns for applications generated by AI agents • Enforce guardrails across auth, data access, APIs, and business logic • Build frameworks to ensure secure-by-default app generation Design “secure generation” systems • Work directly with AI/agent pipelines to prevent insecure code from being produced • Build validation layers for generated code (static + semantic) • Detect prompt injection and adversarial input patterns Own application threat modeling • Identify vulnerabilities in dynamic app creation flows • Analyze risks in multi-tenant user-generated environments • Build reusable threat models for agent-driven systems Build developer-facing security primitives • Auth systems, permission frameworks, secure SDKs • Secure API gateways and rate limiting • Input/output validation layers for LLM-driven flows Red team AI-generated apps • Break applications generated by Emergent agents • Identify systemic weaknesses vs one-off bugs • Feed learnings back into generation systems What We’re Looking For • 5–10+ years in Application Security • Strong coding ability (Python, JS/TS, backend systems) • Deep understanding of: • OWASP Top 10 • Auth & session management • API security • Injection & sandbox escape vectors • Experience working closely with product/engineering teams What Sets You Apart • You think in systems, not vulnerabilities • You want to prevent insecure code from ever existing • Experience with: • AI/LLM systems • Prompt injection & output validation • Secure code generation systems Why Emergent • Build security for AI systems that build software • Operate at global scale (millions of apps, millions of users) • Work directly with founders and core engineering • Solve problems that don’t exist anywhere else yet