Senior Software Engineer, Fullstack

Hagerty is an automotive community and insurer supporting enthusiasts through insurance, auctions, events, and media. The Senior Software Engineer, Fullstack will own fullstack development for Broad Arrow Auctions, building and supporting customer-facing and internal auction systems across Azure and AWS. The role includes architectural contributions, automated testing, production support, cloud and Dynamics 365 integration, and mentoring less experienced engineers.

Responsibilities:

• Crafting solutions through a deep understanding of business objectives, architectural intent, system interactions, and operational requirements, often working in ambiguous problem spaces and within the most complex parts of the system
• Writing clean, human-readable code. Track and consistently apply the comments received on your code to future work
• Contributing to architectural design with an emphasis on complexity, performance, maintainability, and security
• Designing, implementing, and maintaining comprehensive automated unit, integration, and end-to-end tests. Possessing a strong understanding of when and how to apply each test type, including test data management, environment-appropriate execution strategies, and ensuring tests remain reliable and valuable over time
• Being able to thoroughly explain and demonstrate how your product fits into the larger Broad Arrow Group and Hagerty ecosystem and how other services depend on it
• Thoroughly understanding upcoming epics and features of your product, helping product managers craft good feature definitions, and being able to explain them to less experienced engineers
• Helping to define key metrics that signal the health and performance of the product, monitoring them, and providing explanation for changes over time
• Owning and updating the Billboard software used during live auctions, ensuring it is stable, accurate, and ready ahead of every sale
• Actively practice troubleshooting and participate in the on-call support rotation for the team's production services, including support during live auction events
• Evaluating, adopting, and when necessary, designing client and server-side libraries, frameworks, and shared abstractions, establishing clear guidance on when they should be used, when they should not, and the tradeoffs involved
• Defining and refining frontend and service integration patterns, including API contracts, data-fetching strategies, caching, and error handling that balance user experience, performance, operability, and long-term maintainability
• Building and maintaining working expertise in the Azure portions of the Broad Arrow architecture, including accessing, deploying, and troubleshooting Azure artifacts and resources, while working alongside Hagerty's AWS environment
• Understanding and integrating with Microsoft Dynamics 365 in Azure, keeping auction, consignment, and customer data flowing reliably between systems
• Maintaining deep expertise in the client-side ecosystem, including browsers, rendering and hydration models, accessibility standards, performance diagnostics, and modern build/deploy workflows, to deliver resilient user experiences
• Staying current with evolving frontend and platform technologies, thoughtfully incorporating improvements that raise user experience, system reliability, and/or developer productivity without chasing novelty
• Being an active participant in all team activities: team ceremonies, banter, troubleshooting, design discussion, work breakdowns, etc
• Observing team practices and behaviors, working with your manager on ways to improve them, and explaining and modeling them
• Helping less experienced engineers effectively explore topics that are unfamiliar to them and participate in deliberate practice with them in those areas
• Helping teammates understand what it means to be good stewards of the products on which you are working

Requirements:

• Proven experience contributing as a senior engineer or technical lead on multiple large-scale, complex customer facing systems, including initial development, major feature delivery, and at least one year of ongoing production support
• A proven track record of building customer centered products with a deep understanding of how technical decisions impact user experiences
• Comfortable working and actively participating within smaller (5-10 people) technical groups
• Experience working across multiple cloud providers, with hands-on Azure experience and familiarity with AWS
• Experience integrating with Microsoft Dynamics 365 or a comparable CRM platform, and a strong fundamental grasp on WCAG accessibility standards
• Comfortable building and evolving fullstack solutions across modern web interfaces, server-rendered application patterns, backend APIs, cloud infrastructure, and supporting data services
• Able to work across the application boundary, connecting user-facing workflows with reliable backend services, infrastructure, caching, storage, and integration patterns
• Comfortable supporting software where reliability during a live event is critical
• Eager to deeply learn, both independently and with help, our technologies and patterns such as:
• Languages & Runtime: JavaScript / TypeScript, CSS/SCSS, Terraform, Node.js
• Frontend Frameworks & Tooling: NextJS, React, Playwright, React Testing Library, Jest/Vitest
• APIs & Integration Patterns: REST, RPC, GraphQL
• Business Platforms: Microsoft Dynamics 365, Dataverse
• Security: TLS, encryption in transit and at rest, secure coding, secret management
• Performance & Reliability: load testing, profiling, monitoring, alerting, logging, and tracing
• Infrastructure: Azure and AWS, configuration management, and progressive deployment strategies
• Networking Fundamentals: TCP/IP, HTTP, firewalls, load balancers
• Deployment: VMs, containers, cloud providers, configuration management, canary deployments
• Able to clearly communicate your thoughts and actively listen to and integrate the thoughts and comments of others
• This position is open to U.S. remote work. However, team members who reside within 20 miles of the Traverse City headquarters will follow a hybrid schedule, working from the office three days per week
• May require travel for quarterly events
• Familiarity with public company requirements, including Sarbanes Oxley and key regulations, if applicable