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Sr. Security Engineering Full Stack Developer

IS3 Solutions

Saint Louis, MO 63146 • 10/31/2026

Job Description

Job Description

This is a high-impact role requiring both hands-on development expertise and a strong security engineering mindset to guide architecture, compliance, and secure coding practices.

Key Responsibilities

  • Collaborate with the clients engineering team to advance an internally developed security application built on React and PostgreSQL
  • Contribute to full stack development, enhancing frontend and backend functionality
  • Assist in driving the application through CI/CD pipelines, ensuring secure and efficient deployment processes
  • Define and document security requirements, controls, and phased rollout strategies
  • Provide senior-level security engineering guidance across design, development, and deployment discussions
  • Conduct and support application testing, validation, and security reviews
  • Identify and remediate application vulnerabilities and security gaps
  • Support feature enhancements and code development aligned with project timelines
  • Partner with engineering teams to ensure best practices in secure application development Required Qualifications
  • 5–8 years of experience in full stack development with a strong security focus
  • Proven expertise with:
  • Full stack application development (API design, backend services)
  • PostgreSQL (database design and management)
  • React (frontend development)
  • Hands-on experience integrating or supporting CI/CD pipelines
  • Strong understanding of:
  • Application security principles (OWASP, vulnerability management, etc.)
  • Secure coding practices
  • Experience working in cross-functional engineering and security teams
  • Ability to translate security requirements into actionable development tasks

Preferred Qualifications

  • Experience building or supporting internally developed security tools/applications
  • Familiarity with DevSecOps practices and secure SDLC methodologies
  • Experience in application testing frameworks and security validation tools
  • Exposure to enterprise security architectures or compliance frameworks
  • Prior experience contributing to projects with tight go-live timelines

Soft Skills

  • Strong technical leadership presence with ability to influence design discussions
  • Excellent communication and collaboration skills across engineering and security teams
  • Ability to operate with ownership and minimal oversight
  • Comfortable working in fast-paced, deadline-driven environments