Senior Software Engineer

At Liberty Mutual, we deliver peace of mind by helping our customers protect what matters most to them. Our commitment to putting customers at the heart of everything we do is driving transformational change throughout our organization. This position follows a hybrid work model (2 days onsite) and is open to candidates located in Portsmouth, NH; Boston, MA; Plano, TX; Indianapolis, IN; and Columbus, OH.

Job Introduction

Liberty Mutual is seeking a Senior Software Engineer to help build the Partner Platform—comprised of the Partner Portal and Switchboard—supporting our Strategic Partners in US Retail Markets. You will deliver the self-service experiences and shared gateway that partners use to onboard, manage, support, and expand their integrations with Liberty Mutual. Your work will enable product access controls, onboarding workflows, documentation, and operational tools that reduce time-to-market and maintenance cost, while providing a single, secure, and performant entry point to Liberty Personal Lines quoting and post-bind APIs.

If you’re passionate about building secure, scalable systems and great developer experiences, we want to hear from you.

What You’ll Do

• Design and build modern front-end experiences for the Partner Portal using React and TypeScript, creating reusable components and accessible, high-quality UIs.
• Develop and evolve RESTful APIs and serverless services on AWS; use CDK for infrastructure-as-code and event-driven patterns to support high request volumes.
• Engineer Switchboard’s common services layer, including authentication, routing, tokenization, feature access controls, and observability, with a focus on low latency and reliability.
• Apply secure-by-design principles; perform threat modeling and implement robust authN/authZ for partner-facing services.
• Instrument systems for observability (logs, metrics, traces) and operational excellence; build dashboards and alerts in Splunk and Datadog.
• Implement comprehensive testing strategies, including unit, integration, and end-to-end tests for front-end applications.
• Collaborate across teams to coordinate releases, align on standards, and mentor peers; communicate technical concepts effectively to both technical and non-technical stakeholders.
• Continuously identify opportunities to improve performance, quality, developer experience, and partner onboarding speed.

• Minimum 5 years (Senior) of professional software engineering experience building web applications and APIs.
• Strong proficiency in JavaScript/TypeScript and React; experience with end-to-end testing of front-end applications (e.g., Cypress, Playwright).
• Hands-on experience with AWS architecture and serverless: CDK, event-driven design, Lambda fundamentals (cold starts, concurrency, timeouts), and building for scale.
• Solid ability to translate requirements into clear designs and implementation plans; comfortable designing solutions that can be worked on by multiple engineers.
• Strong knowledge of RESTful API design and development; familiarity with API versioning, idempotency, pagination, and error handling.
• Familiarity with security and threat modeling; experience with authentication and authorization patterns (e.g., OAuth 2.0, JWT), and tokenization.
• Experience with observability tooling; familiarity with Splunk and Datadog for logs, metrics, tracing, dashboards, and alerting.
• Understanding of functional programming concepts and when to use them versus object-oriented approaches.
• Excellent cross-team communication and collaboration skills; experience rolling out changes incrementally and non-disruptively (feature flags, canary releases, backward compatibility).
• Strong grasp of system architecture, design principles, agile engineering practices, and software development best practices.
• Bachelor’s or master’s degree in a technical field or equivalent professional experience.

Ready to make an impact? Apply now and help us build the partner-facing platform that powers Liberty Mutual Personal Lines Third Party Integrations.

Pay Philosophy: The typical starting salary range for this role is determined by a number of factors including skills, experience, education, certifications and location. The full salary range for this role reflects the competitive labor market value for all employees in these positions across the national market and provides an opportunity to progress as employees grow and develop within the role. Some roles at Liberty Mutual have a corresponding compensation plan which may include commission and/or bonus earnings at rates that vary based on multiple factors set forth in the compensation plan for the role.

At Liberty Mutual, our goal is to create a workplace where everyone feels valued, supported, and can thrive. We build an environment that welcomes a wide range of perspectives and experiences, with inclusion embedded in

every aspect of our culture and reflected in everyday interactions. This comes to life through comprehensive

benefits, workplace flexibility, professional development opportunities, and a host of opportunities provided through our Employee Resource Groups. Each employee plays a role in creating our inclusive culture, which supports every individual to do their best work. Together, we cultivate a community where everyone can make a meaningful impact for our business, our customers, and the communities we serve.

We value your hard work, integrity and commitment to make things better, and we put people first by offering you benefits that support your life and well-being. To learn more about our benefit offerings please visit: https://LMI.co/Benefits

Liberty Mutual is an equal opportunity employer. We will not tolerate discrimination on the basis of race, color, national origin, sex, sexual orientation, gender identity, religion, age, disability, veteran's status, pregnancy, genetic information or on any basis prohibited by federal, state or local law.

Fair Chance Notices

• California
• Los Angeles Incorporated
• Los Angeles Unincorporated
• Philadelphia
• San Francisco