Senior Software Security Engineer

Loft Federal•Golden, CO

About The Position

Loft Federal is committed to delivering the U.S. national security space community a fast, affordable, and streamlined pathway to orbit. As a wholly owned U.S. subsidiary of Loft Orbital Solutions, Inc., we specialize in providing mission-ready space infrastructure with unmatched efficiency. At Loft, we empower our team with autonomy, ownership, and bold problem-solving opportunities while fostering a tight-knit, supportive environment. We believe that diversity, inclusivity, and community are the foundation of an open and innovative culture. We value kind, collaborative, and mission-driven teammates who excel in problem-solving and communication—because great solutions come from great teams. Are you ready to embark on this exciting journey with us? Are you ready to embark on this exciting journey with us? We are seeking a Senior Software Security Engineer to lead the design, implementation, and assessment of the security architecture for our flight and ground software systems. This is not a traditional IT compliance role; you are a hands-on software engineer first, with a deep passion for building security into the core of a product. You will be responsible for everything from hands-on coding of security services to integrating automated controls into our CI/CD pipelines and ensuring our architecture meets the stringent requirements for a government Authority to Operate (ATO). You will spend your time writing code, hardening our infrastructure, participating in threat modeling, and mentoring our talented software engineers in secure development practices. You will be the team's expert on balancing cutting-edge security with the very real constraints of embedded systems and the compliance demands of NIST and CMMC frameworks.

Requirements

5+ years of professional experience in software development, with at least 3 years in a security-focused role.
Deep understanding of modern security principles, including DevSecOps, Zero Trust, container security, and common threats.
Demonstrable expertise in one or more of the following security domains: network security, application security, or cryptography.
Technical experience implementing and assessing controls for frameworks such as NIST SP 800-53 / 800-171.
Hands-on experience with scripting and programming languages (e.g., Python, Bash, C++).
Strong understanding of Linux systems security and hardening.
Experience with container security (Docker, k3s) and vulnerability scanning tools.
One or more current, relevant security certifications such as Security+, CySA+, GSEC, CASP, or CISSP.
Active security clearance required.

Nice To Haves

Experience with embedded Linux environments and the challenges of resource-constrained systems (CPU, memory).
Hands-on experience with service-oriented or message-oriented architectures.
Experience in the aerospace, defense, or another high-assurance industry.
Particularly those who have written flight software for spacecraft, robotics, and/or autonomous vehicles.
Experience with Infrastructure as Code (IaC) tools (Terraform, Helm, Ansible).

Responsibilities

Design, develop, and contribute to the Zero Trust security architecture for our flight software, including services for authentication/ authorization, cryptographic key management, secure data storage, and secure transport.
Lead the research and evaluation of security features, protocols, and third-party tools to make data-driven architectural decisions.
Collaborate with infrastructure teams to secure our onboard flight software platform, including hardening embedded Linux systems, segmenting spacecraft network enclaves, configuring onboard IAM policies, and mitigating operational cybersecurity risks across the asset lifecycle.
Work with the DevOps team to integrate and automate security controls directly into our CI/CD pipelines, including Static/Dynamic Application Security Testing (SAST/DAST), Software Composition Analysis (SCA), SBOM generation, and container vulnerability scanning using tools like SonarQube.
Serve as the technical expert for designing and implementing security controls required by NIST SP 800-53 / 800-171 such as encryption, access control, and secure logging.
Participate in security architecture reviews, code audits, and threat modeling sessions to identify and remediate vulnerabilities like API weaknesses and supply chain risks.
Collaborate with security team and ISSM to prepare systems and documentation for ATO approval.