Senior Applications Developer

Marsh McLennan•Seattle, WA

2d•Hybrid

About The Position

As a Senior Software Developer, you will design, develop, implement, and support high-performance, scalable .NET scientific simulation platforms using agile practices. This hands-on role requires both independent work and collaboration to enhance usability, performance, automation, and scalability. We will count on you to: Develop customer-facing online experiences, including portals, licensing tools, help content, and news features. Build high-performance applications in C#/.NET using modern development standards and best practices. Support migration and development efforts across Azure and other cloud platforms. Collaborate with actuaries, QA, domain experts, and product partners to design, test, and support software tools. Enhance telemetry, reporting, dashboards, and user feedback loops to improve product usability and performance.

Requirements

10+ years of software development experience.
Expert-level proficiency in C# (v12), .NET (v8), and Visual Studio 2022/2023.
Strong knowledge of threading, async/await, LINQ, pattern matching, interoperability, and REST API design.
Experience architecting maintainable, flexible, scalable, cloud-native solutions, especially in Azure.
Excellent communication, teamwork, and self-motivation skills, with experience working directly with users in an Agile environment.
Proven ability to ship commercial software or customer-facing online experiences.
Ability to work both remotely and in person, with willingness to travel occasionally.
Experience with SQL, Protobuf, and interactive charting/graphing packages.

Nice To Haves

Experience with Object-Oriented Analysis and Design (OOAD).
Familiarity with Angular, WebAssembly, HTML, CSS, TypeScript, JavaScript, and jQuery.
Additional background in Python, Kubernetes, C++, C++/CLI, or a strong mathematics foundation.
Experience working with LLMs and AI agent technologies.

Responsibilities

Develop customer-facing online experiences, including portals, licensing tools, help content, and news features.
Build high-performance applications in C#/.NET using modern development standards and best practices.
Support migration and development efforts across Azure and other cloud platforms.
Collaborate with actuaries, QA, domain experts, and product partners to design, test, and support software tools.
Enhance telemetry, reporting, dashboards, and user feedback loops to improve product usability and performance.