Senior Application Security Architect

Master App Labs is seeking a Senior Application Security Architect to help shape and operationalize application-security architecture principles across modern platforms. This contract role is based in Richmond, VA with hybrid expectations, including onsite presence during an initial 90-day probationary period, as security architecture reviews and SDLC security integration are built into web, mobile, API, microservices, and cloud-native systems.

In this position, you will define application-security architecture guardrails, lead architecture security reviews and threat modeling, and partner with engineering to embed security across the development lifecycle. You will also help translate security requirements into repeatable patterns for authentication, authorization, encryption, secrets management, logging, privacy, API protection, and data protection.

• Define application-security architecture principles, standards, patterns, reference implementations, and guardrails for web, mobile, APIs, microservices, and cloud-native systems.
• Conduct architecture and design reviews to identify trust boundaries, attack paths, data flows, security gaps, and compensating controls.
• Lead or facilitate threat modeling for new applications, major features, integrations, and high-risk changes.
• Establish repeatable security requirements for authentication, authorization, session management, encryption, secrets management, logging, privacy, API protection, and data protection
  .
• Partner with software engineers to integrate security throughout the SDLC, including code review
  , CI/CD pipelines
  , infrastructure as code
  , testing, release approval, and production monitoring.
• Evaluate and guide use of security tooling such as SAST, DAST, software composition analysis, container and image scanning, API security testing, secret scanning, and runtime protection
  .
• Define a vulnerability-management approach for applications and dependencies, including severity criteria, remediation SLAs, exception processes, and verification of fixes.
• Assess security risk in third-party libraries
  , open-source dependencies, SaaS integrations, and vendor components.
• Design identity and access-control patterns including least privilege
  , MFA/SSO integration
  , service-to-service authentication
  , RBAC/ABAC
  , and privileged-access controls.
• Work with cloud and platform teams to secure hosting environments such as Kubernetes
  , serverless
  , containers,
  CI/CD
  , cloud IAM
  , network segmentation, and secrets storage.
• Advise incident-response teams on application-layer threats
  , contributing to root-cause analysis and post-incident security improvements.
• Maintain architecture documentation including security decision patterns
  , risk registers
  , and exception documentation
  .

• Bachelor’s degree in computer science, cybersecurity, engineering, or related field, or equivalent practical experience.
• 10+ years in software engineering, application security, security engineering, or related technical roles, including 2+ years designing security architecture for systems.
• Strong understanding of secure software-development principles and common application risks, including the OWASP Top 10
  , insecure authorization, injection, deserialization, and API abuse.
• Experience designing and implementing end-to-end security architectures for data-at-rest, in-transit, and in-use across Azure
  , SQL Server
  , Dynamics 365
  , Power Platform
  , and ArcGIS
  , using automated classification (e.g.,
  Microsoft Purview
  ), encryption,
  DLP rules, and privacy risk assessments (
  DPIAs
  ).
• Experience enforcing granular data access controls including RBAC
  , Row-Level Security
  , Column-Level Encryption
  , and dynamic masking, plus centralized database audit logging and activity monitoring…