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Senior Principal Engineer - Applications Development

Marsh McLennan · 2 Locations

Workday Posted Jun 3, 2026 First seen Jun 3, 2026

Company:

Description:

INTERNAL JOB POSTING

We are seeking a talented individual to join Mercer Technology at Mumbai/Noida/Gurgaon/Pune. This is a hybrid role that has a requirement of working at least three days a week in the office.

Senior Principal Engineer - Applications Development (Grade D1)

No of Positions: 1

Last Date to Apply - 9th June 2026.

We will count you to

  • Develop and work in a development team to develop integrated ASP.NET web applications.

  • Write clean, scalable code using .NET-programming languages.

  • Provide day-to-dayproduction supportfor a legacy ASP.NET application and supporting applications, including incident triage, root-cause analysis, and timely resolution.

  • Maintain and enhanceexisting functionality usingC# and .NET Framework 4.7.2, delivering reliable updates with minimal disruption to users.

  • Troubleshoot and resolve issues across the full stack, includingSQL Server(queries, stored procedures, triggers) and application/service layers.

  • Support and maintain integrations withDotNetNuke (DNN) 9.13, including authentication, navigation, and role-based access management.

  • Maintain and enhance service interfaces, includingWCFandASMXweb services, and support related API integrations as applicable.

  • Develop and update reporting solutions leveragingCrystal Reports, and support document/data generation features using components such asAspose,Telerik, andHighcharts.

  • Collaborate closely withQAand other developers to define acceptance criteria, reproduce defects, validate fixes, and ensure high-quality releases.

  • Follow establishedSDLCand change management practices, including estimation, documentation, peer reviews, and controlled deployments.

  • Ensure code issecure, maintainable, and compliantwith internal standards through clean design, defensive coding, and adherence to best practices.

  • Create and maintainunit testsand supporting test data to improve reliability and reduce regression risk.

What you need to have

  • 4+ years of professional software development experience, including support and enhancement oflegacy/enterprise applications.

  • Strong proficiency withC# / .NET Framework 4.7.2andASP.NET.

  • StrongObject-Oriented Programming (OOP)skills and ability to write clean, maintainable code.

  • Proficient with Git and GitHub for code maintenance. Familiarity with Snyk static scan, Git Guardian plug ins as pre-commit checks

  • StrongSQL Serverdevelopment/support experience, includingT-SQL queries, stored procedures, and triggers.

  • CSLA is the ORM being used. Hands-on experience with any major ORM.

  • Provenproduction supportcapability: troubleshooting, root-cause analysis, and efficient defect remediation.

  • Experience withWCFandASMX (ASP.NET Web Services).

  • Working knowledge ofREST APIs, JSON, Windows Workflow foundation

  • Experience withVisual Studio 2017/2022andTFS/Azure DevOps-stylesource control and work item workflow.

  • Hands-on experience usingLINQ,XML,JavaScript, andjQuery.

  • Reporting experience withCrystal Reports.

  • Familiarity with third-party components used in legacy applications:

    • Aspose(includingAspose.Cells)

    • Telerik Controls for ASP.NET

    • Highcharts

    • Test Driven development experience using MSTest

Eligibility

  • Minimum 12 months experience as a Senior Engineer/Principal Engineer

  • Should have at least “Meets Expectations” or equivalent rating in last appraisal

  • Should not be under any Performance Continuity Plan, or had any official Disciplinary action within the last 3 months

  • Should not have applied for any other IJP within Mercer in the last 3 months

What makes you stand out?

  • Adaptable communicator, facilitator, influencer and problem solver

  • High attention to detail

  • Good relationship skills, Proven ability to work on own initiative as well as in a team 

  • Ability to multi-task and prioritize time effectively

Marsh (NYSE: MRSH) is a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of over $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective. For more information, visit corporate.marsh.com, or follow us on LinkedIn and X.

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, caste, disability, ethnic origin, family duties, gender orientation or expression, gender reassignment, marital status, nationality, parental status, personal or social status, political affiliation, race, religion and beliefs, sex/gender, sexual orientation or expression, skin color, or any other characteristic protected by applicable law.

Marsh is committed to hybrid work, which includes the flexibility of working remotely and the collaboration, connections and professional development benefits of working together in the office. All Marsh colleagues are expected to be in their local office or working onsite with clients at least three days per week. Office-based teams will identify at least one “anchor day” per week on which their full team will be together in person.