Principal Security Engineer (Product & Business Enablement)

About the Opportunity

Mariner is seeking a senior Security Engineer to join our dynamic Security Engineering & Architecture team. Reporting to the VP, Security Engineering & Architecture, you will serve as an embedded security partner to business, product, data, and technology teams. Your mission: empower innovation by translating business goals into practical, scalable security architecture and reusable design patterns that enable new capabilities-safely and efficiently.

This role is highly collaborative and focused on breadth. You’ll engage with cross-functional teams while solutions are still evolving, embedding security from the start. You’ll secure Mariner’s modern business platforms-including SaaS services, custom applications, APIs, data flows, and AI capabilities-by providing clear guidance, designing pragmatic controls, and accelerating business outcomes without slowing down delivery.

Key Responsibilities

• Assess end-to-end architectures spanning SaaS platforms, internally developed applications, APIs, integrations, data services, and AI; identify trust boundaries, sensitive data flows, and failure modes
• Facilitate architecture and threat reviews with delivery teams; document decisions and residual risk
• Own and maintain a library of secure-by-design patterns for SaaS adoption, APIs, integrations, data movement, secrets, credentials, authorization, and AI-enabled workflows
• Translate security requirements into practical designs that enable business outcomes-reducing reliance on late-stage reviews
• Serve as a primary security partner for product, enterprise architecture, data, and technology teams, engaging early in roadmaps and design
• Provide security expertise in vendor evaluations and SaaS selection in partnership with procurement and enterprise architecture
• Collaborate with Security Platform Engineering to convert security requirements and approved patterns into automated guardrails and self-service workflows
• Partner with Identity & Access and Infrastructure teams on authentication, authorization, posture management, and observability
• Provide technical security support for AI-enabled products and workflows, ensuring secure data boundaries and auditability
• Support the evolving enterprise data strategy, M&A activities, and technology onboarding with robust security architecture
• Enable business and technology teams via regular office hours, training, and embedded engagement; build security fluency and support sound decision-making

What You Bring

Required

• Bachelor’s degree in Computer Science, Engineering, Information Security, or related field (or equivalent practical experience)
• 10+ years of experience in security architecture, cloud/SaaS security, solutions architecture, software engineering, or SRE/DevOps, with at least 5 years in a dedicated security role
• Demonstrated track record securing distributed business systems with SaaS, APIs, integrations, identity, and third-party services
• Ability to rapidly analyze unfamiliar architectures, identify material risks, and translate findings into actionable designs
• Experience partnering with business, engineering, and product teams to shape secure solutions and make risk-aware decisions
• Evidence of pragmatic, business-aware security thinking-able to revise requirements to match business context, with clear rationale and tradeoffs

Preferred

• Hands-on engineering or architecture background plus experience collaborating with business or product teams
• Experience shifting the perception of security from a business obstacle to an enabler
• Background in SaaS- and integration-rich environments with AI-enabled workflows
• Familiarity with data security concepts (classification, DLP, encryption, data governance, etc.)
• Experience in financial services, wealth management, regulated industries, or M&A technology integrations is a plus
• Security certifications (CISSP, CCSP, CSSLP, cloud security) are valued but not required; demonstrated impact matters most

Core Skills

• Strong systems-thinking and security-architecture abilities across SaaS, APIs, integrations, data, cloud, and AI
• Ability to bridge business outcomes and technical controls-quickly and credibly
• Exceptional communication and facilitation skills; able to influence and build trust across business and engineering stakeholders
• Pragmatic approach to risk-focus on material threats and empowering the business
• Technical credibility to challenge designs, review APIs, and reason authentically about authentication and authorization
• Adaptability, curiosity, and comfort navigating rapidly evolving ecosystems

Leadership & Growth

This is a senior individual contributor role with broad technical influence and mentorship responsibilities. As Mariner grows, future direct leadership opportunities may arise.

Work Environment & Benefits

• Professional, remote-first environment-travel is limited (less than 10%)
• Inclusive culture where security is a business partner, not a gatekeeper
• Access to industry-leading technology platforms and forward-thinking colleagues

Ready to help shape the secure future of financial innovation? Apply now to join Mariner and be a key enabler of business growth and transformation.

• We welcome your interest in being a part of our firm.
• We believe in giving associates progressive opportunities, actively nurturing professional growth and giving back to the community.
• We are dedicated to building a diverse culture where everyone has the support they need to achieve their career goals.
• We offer an innovative workplace and a culture that fosters camaraderie, teamwork and work-life balance.

• By submitting your application, you agree to the collection and use of your personal information as described in our Employee and Applicant Privacy Notice
• EOE M/F/D/V