Principal Full Stack Engineer

Description We deliver our customers peace of mind every day by helping them protect what they value most. Our passion for placing the customer at the center of everything we do is driving a transformational shift at Liberty Mutual. Operating as a tech startup within a Fortune 100 company, we are leading a digital disruption that will redefine how people experience insurance.

At Liberty, you'll thrive in a hybrid setting that fosters in-person collaboration, innovation and growth. This approach optimizes both remote and in-person interactions, enabling you to connect and ideate with your team and deepen valuable relationships across the company, while still enjoying the flexibility of remote work for focused tasks and projects.

This role has a hybrid work schedule (2 days onsite) and we are considering candidates based in Portsmouth, NH, and Boston, MA.

You must be authorized to work in the United States without employer sponsorship now or in the future. We will not sponsor employment visas. Candidates who will require future sponsorship, including candidates on CPT/OPT/STEMOPT who will require future sponsorship, are not eligible to apply.

We are seeking a Principal Full Stack Engineer to join the Global Enterprise Services team within Global Finance Tech (GFT). In this role, you will serve as the technical leader for the Jet Setters squad, setting the technical direction for and driving the architecture, design, and delivery of back-end and full-stack applications. The Jet Setters squad owns a portfolio of 22 GFT products, including the Reservation System, Contracts Portal, Non-Employee Portal, Corporate Aviation Flight Approvals and Business Impact Analysis (BIA).

As the most senior engineer on the squad, you will partner with product owners, business partners, architects and engineering leadership to shape the long-term technical roadmap and deliver secure, reliable, and scalable solutions including the strategic integration of AI-powered capabilities that enhance user experiences and operational efficiency. You will act as a force multiplier: mentoring engineers, elevating engineering standards, and influencing technical decisions.

Set the technical vision and architecture strategy for the squad’s portfolio, balancing immediate delivery needs with long term scalability and maintainability. Lead the design and development of complex, high impact applications and shared platform capabilities. Drive architectural decisions and establish patterns, frameworks, and reusable components adopted across teams. Provide technical leadership and hands-on mentorship to engineers, fostering growth and raising the bar for engineering quality. Establish and champion engineering guidelines, standards, and best practices across the organization. Review code and technical designs, providing actionable feedback and ensuring adherence to architectural and quality standards. Own and evolved automated testing, CI/CD, and observability strategies to ensure reliability and operational excellence. Lead impact analyses and technical solutioning for the most complex, systemic, and high-risk changes. Develop and recommend technical alternatives for ambiguous, large scale, or systemic problems. Guide production support strategy, including complex incident triage, root cause analysis, and defect resolution. Author and steward architecture documentation, technical specifications, and production support artifacts. Define and lead the strategy for integrating AI-powered features and capabilities across existing and new product lines. Partner with product and business leaders to translate business objectives into technical strategy and influence prioritization and roadmaps. Collaborate with your team’s solutions engineer and architects on enterprise-wide technical initiatives and governance.

Bachelor’s degree in technical or business discipline. Minimum 8+ years