Data Systems Developer Jobs in Muskego, WI (NOW HIRING)

What We Do

Milliman IntelliScript is a group of a few hundred experts in fields ranging from actuarial science to information technology to clinical practice. Together, we develop and deploy category-defining, data-driven, software-as-a-service (SaaS) products for a broad spectrum of insurance clients. We’re a business unit within Milliman, Inc., a respected consultancy with offices around the world.

Candidates who have their pick of jobs are drawn to IntelliScript’s entrepreneurial and collaborative culture of innovation, excellence, exceptional customer service, balance, and transparency. Every single person has a voice in our company, and we challenge each other to push the outer limits of our full, diverse potential. And we’ve shown sustained growth that ensures you’ll have room to grow your skillset, responsibilities, and career.

Our team is smart, down-to-earth, and ready to listen to your best ideas. We reward excellence and offer competitive compensation and benefits. Visit our LinkedIn page for a closer look at our company and learn more about our cultural values here.

Milliman invests in skills training and career development and gives all employees access to a variety of learning and mentoring opportunities. Our growing number of Milliman Employee Resource Groups (ERGs) are employee-led communities that influence policy decisions, develop future leaders, and amplify the voices of their constituents. We encourage our employees to give back to their varied professions, including leadership in professional organizations. Please visit our website to learn more about Milliman’s commitments to our people, diversity and inclusion, social impact, and sustainability.

What this position entails

The Software Engineer III is a critical contributor at the intersection of product engineering and data engineering, responsible for designing and delivering scalable backend services and data pipelines that power next-generation Insurtech products. As a member of the Data Curation team, you will be responsible for creating and modernizing solutions central to our most-used offerings based on market needs and product requirements. You will mix system-level thinking and hands-on development while partnering closely with software engineers, data engineers, product managers, and stakeholders to deliver solutions that are scalable, compliant, and market-differentiating.

As a software engineer focused on prescription, health, and medical record data solutions, you thrive in fast-moving, modernization development and can balance strategic thinking with hands-on execution to help us achieve product-market fit and scale. You will have the opportunity to help lead the development of new processes and workflows that will become the core of many products that drive efficiency, compliance, and value for our clients.

What you’ll be doing

• Design, build, and optimize data pipelines for ingestion, transformation, enrichment, and distribution of structured and unstructured data
• Develop event-driven and batch data processing systems using AWS-native services
• Integrate backend application services with data pipelines, ensuring consistency between transactional and analytical systems
• Modernize legacy systems into microservices and event-driven architectures in AWS
• Implement data reliability and quality mechanisms (validation, monitoring, observability, and error handling)
• Build and maintain data workflows and orchestration pipelines to ensure timely and accurate data delivery
• Ensure systems are designed for performance, scalability, security, and compliance
• Mentor engineers and contribute to raising the team’s engineering maturity and delivery quality
• Collaborate in SAFe Agile teams, delivering measurable outcomes aligned to product and platform objectives
• Support production operations, including monitoring, troubleshooting, and continuous improvement of system performance

What we need

• 5+ years of experience in software engineering with significant focus on data pipeline development and backend systems
• Strong proficiency in C# (.NET) and SQL, with experience working with large-scale data systems
• Hands-on experience building and operating data pipelines and data processing systems
• Experience with AWS data and compute services
• Experience with microservices and event-driven architecture
• Strong understanding of data modeling, data integration, and data lifecycle management
• Experience with DevOps practices, including CI/CD, GitHub workflows, and Terraform
• Working knowledge of Agile/SAFe delivery models
• Experience with full software development lifecycle 
• Strong problem-solving and debugging skills across both application and data layers
• Ability to design resilient, scalable, and observable data systems
• Proven ability to own pipeline reliability, performance, and data quality outcomes
• Excellent collaborative skills, work well independently and as a team member 
• Proven analytical skills to interpret and implement business and functional requirements 

What you bring to the table

• A data-first engineering mindset, with deep understanding of how data flows through systems and enables business value
• Demonstrated ability to design and operate complex data pipelines and distributed systems
• Strong ownership and accountability for data quality, reliability, and system performance
• Can identify, analyze, and evaluate complex problems, demonstrating attention to detail and the ability to synthesize complex data, contributing to team goals and objectives
• Experience influencing engineering teams through technical leadership, mentoring, and best practices adoption
• A collaborative approach, working effectively across software engineering, data engineering, and product teams
• Has a thorough understanding of the field and seeks to enhance technical expertise by staying up to date with industry trends, best practices, and emerging technologies

Wish list

• Continued education and/or advanced degree(s)
• Experience building production-grade data pipelines using AWS data services
• Experience with real-time or streaming data architectures
• Familiarity with data warehouse and lakehouse architectures
• Experience implementing data observability, lineage, and governance practices
• Experience working in regulated data environments (e.g., healthcare, HIPAA, or financial data systems)
• Strong understanding of digital health data—experience with EHR systems, FHIR/HL7 interoperability, or data integration is highly preferred
• Experience with clinical informatics (e.g. data table structure, storage, relationships, maintenance, etc.) as well as in-depth knowledge of medical claims and electronic health records (ICD-10 codes, data management, research, etc.)
• Experience rebuilding on-prem legacy applications in a modern cloud environment (AWS)
• Experience with workflow orchestration tools and pipeline scheduling frameworks
• AWS certifications or advanced cloud data engineering training

Location

The expected application deadline for this job is August 15, 2026. This position is open to remote work. Applicants must be willing to travel to the Milliman office in Brookfield, WI as needed and travel nationwide for meetings, conferences, and team events.

Compensation

The overall salary range for this role is $104,900 - $199,065. For candidates residing in:

• Alaska, California, Connecticut, Illinois, Maryland, Massachusetts, New Jersey, New York City, Pennsylvania, Virginia, Washington, or the District of Columbia the range is $120,635 - $199,065.
• All other locations the salary range is $104,900 - $173,100.

A combination of factors will be considered, including, but not limited to, education, relevant work experience, qualifications, skills, certifications, etc.

Benefits

We offer a comprehensive benefits package designed to support employees’ health, financial security, and well-being. Benefits include:

• Medical, Dental and Vision – Coverage for employees, dependents, and domestic partners.
• Employee Assistance Program (EAP) – Confidential support for personal and work-related challenges.
• 401(k) Plan – Includes a company matching program and profit-sharing contributions.
• Discretionary Bonus Program – Recognizing employee contributions.
• Flexible Spending Accounts (FSA) – Pre-tax savings for dependent care, transportation, and eligible medical expenses.
• Paid Time Off (PTO) – Begins accruing on the first day of work. Full-time employees accrue 15 days per year, and employees working less than full-time accrue PTO on a prorated basis.
• Holidays – A minimum of 10 paid holidays per year.
• Family Building Benefits – Includes adoption and fertility assistance.
• Paid Parental Leave – Up to 12 weeks of paid leave for employees who meet eligibility criteria.
• Life Insurance & AD&D – 100% of premiums covered by Milliman.
• Short-Term and Long-Term Disability – Fully paid by Milliman.

Equal Opportunity

All qualified applicants will receive consideration for employment, without regard to race, color, religion, sex, sexual orientation, national origin, disability, or status as a protected veteran.