Senior Applications Developer

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.

• 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.

• 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.

• Experience with Object‑Oriented Analysis and Design (OOAD).
• Additional background in Python, Kubernetes, C++, C++/CLI, or a strong mathematics foundation.
• Experience working with LLMs and AI agent technologies.

We help you be your best through professional development opportunities, interesting work and supportive leaders. We foster a vibrant and inclusive culture where you can work with talented colleagues to create new solutions and have impact for colleagues, clients and communities. Our scale enables us to provide a range of career opportunities, as well as benefits and rewards to enhance your well‑being.

Marsh is committed to embracing a diverse, inclusive and flexible work environment. We aim to attract and retain the best people and embrace diversity of age background, disability, ethnic origin, family duties, gender orientation or expression, marital status, nationality, parental status, personal or social status, political affiliation, race, religion and beliefs, sex/gender, sexual orientation or expression, skin color, veteran status (including protected veterans), or any other characteristic protected by applicable law.

If you have a need that requires accommodation, please let us know by contacting reaso