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Application Security Engineer

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Application Security Engineer in USA

  • Opendoor
  • Full time
  • Email
  • Miami, FL

Responsibilities

  • Define, build, and operate application vulnerability identification, triage, and remediation capabilities across consumer products, internal tools, and GraphQL APIs.
  • Assess and operate AppSec tooling for static and dynamic testing, software supply-chain risk detection, and secrets scanning, integrating findings into GitHub, Linear, and Slack workflows.
  • Own and mature the HackerOne bug bounty program, including report triage, researcher relationships, and remediation follow-through.
  • Lead threat modeling and security design reviews for services, APIs, and mobile features, converting findings into rules, lint checks, and CI guardrails.
  • Build AI agents and automated workflows for vulnerability triage, exploit validation, and remediation pull-request drafting.
  • Partner with engineering teams to harden authentication, authorization, input validation, GraphQL services, and Kubernetes workloads.
  • Build offensive security capabilities through internal testing, red-team exercises, and adversarial analysis.
  • Establish secure-by-default standards for AI-enabled applications, MCP servers, and agent-driven workflows.
  • Develop secure design standards, participate in engineering rituals, and strengthen the organization’s security culture.

Requirements

  • 5+ years of application security or software engineering experience with a security focus.
  • Strong programming skills in at least one of Python, Go, TypeScript, or Ruby, with the ability to read and write code across the others.
  • Hands-on deployment experience with GitHub Advanced Security, Semgrep, or equivalent security risk detection tooling.
  • Strong understanding of application and API vulnerability classes, including GraphQL, REST, and gRPC security issues.
  • Practical threat modeling and security design review experience.
  • Experience with cloud and container security on AWS and Kubernetes, including identity and access management, secrets management, and CI/CD pipeline security.
  • Demonstrated experience building agentic systems and automation that replace reactive security work.
  • Ability to operate autonomously in ambiguous environments and apply a business-enablement security mindset.
  • Preferred experience with penetration testing, API or mobile security, red-team operations, bug bounty or coordinated disclosure programs, mobile application security, AI/ML pipeline security, agent frameworks, or MCP integrations.
  • OSCP, OSWE, or similar offensive security certification is a bonus.

Benefits

  • The role is based in Opendoor’s downtown Miami office and requires in-person work four days per week: Monday, Tuesday, Thursday, and Friday.
  • Candidates must live within commuting distance of the Miami office.

Opendoor

Founded in 2014, Opendoor’s mission is to power life’s progress one move at a time. The traditional real estate process is broken and our goal is simple: fix it. We are building a digital, end-to-end customer experience that makes buying and selling a home simple, certain, and fast. We have assem...

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