Quantitative Software Engineer - Expert Systems

Henderson, NV | Full-Time | Onsite Monday-Thursday | WFH Friday

A few important things to know upfront:

• Onsite is required Monday-Thursday at our Henderson, NV office
• Work from home on Fridays
• This is NOT a remote position
• Candidates must be currently authorized to work in the United States
• PMSI does not provide employment-based visa sponsorship for this position, now or in the future
• Strong professional communication skills are essential
• We move quickly, collaborate closely, and need someone comfortable working in a fast-paced, hands-on environment

If that works for you, keep reading, because this isn't your typical software engineering role.

We're looking for an engineer who likes solving hard problems, not just writing code.

You'll combine software engineering + quantitative analysis + financial logic + AI to build production systems supporting complex mortgage and financial operations.

You'll get to:

• Build production-grade software and expert systems
• Turn complex business knowledge and decision-making into automated system logic
• Work with large financial and mortgage servicing datasets
• Build SQL-based systems, ETL pipelines, APIs, and automated workflows
• Apply optimization, simulation, statistical modeling, and operations research
• Develop solutions involving cash flow, financial models, risk, reconciliation, and exception management
• Automate processes that currently require significant manual analysis
• Build systems designed for accuracy, validation, traceability, and auditability
• Work directly with developers, operations teams, financial professionals, and subject matter experts
• Help enhance and expand PMSI's proprietary Q technology platform

The role includes building expert systems that integrate rules-based logic, quantitative models, and decision-support algorithms into PMSI's technology platforms.

We're looking for someone who knows how to use AI as an engineering tool without blindly trusting the output.

You'll have opportunities to:

• Use AI coding agents and AI-assisted development tools
• Apply AI to coding, testing, debugging, documentation, and modernization
• Build controlled AI/agentic workflows using APIs, data, business rules, and internal systems
• Validate, test, and refine AI-generated code
• Build appropriate controls, monitoring, and human oversight into AI-enabled solutions

• Strong C#/.NET, C++, or comparable object-oriented development
• Strong SQL and/or MongoDB
• Experience with APIs, ETL/data pipelines, automated workflows, and data-intensive applications
• Experience using AI coding agents or AI-assisted development tools
• Knowledge of quantitative analysis, optimization, simulation, statistical modeling, or operations research

• Excellent analytical and problem-solving skills
• Strong professional verbal and written communication
• Ability to explain complex technical concepts clearly
• Comfortable asking questions and working directly with subject matter experts
• Ability to translate business problems into technical solutions
• Strong documentation skills
• Detail-oriented and quality-focused
• Comfortable working in a collaborative, fast-moving environment

• Bachelor's degree in Operations Research, Financial Engineering, Applied Mathematics, Computer Science, Industrial Engineering, or related field
• Typically 3-7 years of relevant experience in software development, quantitative analysis, or analytical technology development
• Demonstrated experience building production-grade systems
• Exceptional technical and analytical ability may allow some flexibility in years of experience

• Master's degree in a quantitative field
• Structured finance or mortgage servicing experience
• Financial modeling…