Principal Software Engineer
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Job Description
Senior software engineer building production .NET applications for Milliman’s insurance e-billing platform. Designing distributed systems, REST integrations, testing, and mentoring engineers remotely across the U.S.
Responsibilities:
- Design, build, debug, release, and maintain production web applications and distributed systems
- Work primarily on back-end systems using the core stack, contributing to front-end features when needed
- Collaborate with product managers, designers, and engineers to shape requirements and deliver high-quality software
- Write clean, maintainable code and contribute through code reviews, testing, and technical discussions
- Improve software quality through automated tests, monitoring, and production reliability practices
- Review user stories and project requirements, clarifying gaps and details for the team
- Contribute to API design and system integrations, including REST-based services and application workflows
- Break down work, surface risks, and keep delivery moving
- Support and mentor other engineers through collaboration, pairing, code review, and knowledge sharing
- Work in an agile environment and contribute to predictable software delivery
- Use modern developer tooling, including AI coding agents and related workflows
- Collaborate with security and infrastructure partners to keep applications secure, stable, and supported
- Stay current on relevant tools, practices, and technologies and apply improvements to the product or team
Requirements:
- 10+ years of experience designing, building, and releasing web applications in production environments
- 5+ years of back-end development experience with .NET and C#
- 3+ years of experience implementing and integrating REST APIs
- 3+ years of experience with SQL Server or another relational database
- 2+ years of experience using ORM frameworks such as Entity Framework Core
- 2+ years of front-end development experience with Svelte, React, or Vue, ideally with TypeScript
- Experience in Agile software development environments such as Scrum or Kanban
- Formal or informal leadership experience within a software team
- Excellent track record of on-time product delivery
- Ability to prioritize multiple concurrent projects and interdependent deliverables
- Strong verbal and written communication skills
- Ability to work with technical and non-technical teammates
- Proactive communication in a virtual work environment
- Collaborative, pragmatic, dependable, low-ego approach
- Ability to balance speed, quality, and maintainability
- Customer service orientation and prompt follow-up on customer issues
- Must be legally authorized to work in the United States without immigration support or sponsorship from Milliman now or in the future
- Bachelor’s degree in Computer Science or a relevant major (preferred, not required)
- Preferred: experience with AI-assisted development tools, CI/CD pipelines, monitoring and observability, accessible user interfaces, Azure, webhooks or event-driven integrations, and the insurance industry
Benefits:
- Medical, Dental and Vision coverage for employees, dependents, and domestic partners
- Employee Assistance Program (EAP)
- 401(k) Plan with company matching and profit-sharing contributions
- Discretionary Bonus Program
- Flexible Spending Accounts (FSA)
- Paid Time Off (PTO)
- Minimum of 10 paid holidays per year
- Family Building Benefits, including adoption and fertility assistance
- 11 weeks of paid parental leave for eligible employees
- Life Insurance & AD&D, with 100% of premiums covered by Milliman
- Short-Term and Long-Term Disability, fully paid by Milliman
- Skills training and career development
- Learning and mentoring opportunities
- Employee Resource Groups (ERGs)
- Remote work arrangement
- Optional onsite work in select Milliman office locations
- Occasional work-related travel for practice meetings, company events, and industry conferences
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