Software Engineer (C# / .NET)

PassFort; Brussel Hoofdstad; On-site; EUR 60,000 - 90,000; Full time

Job summary

Moody's Analytics, Orbis engineering team, is seeking a skilled .NET developer to maintain, enhance and evolve high-scale applications used for financial decision-making. You will work on .NET Framework 4.8 and .NET 10, ASP.NET Core MVC, and modern front-end tech, partnering with product, design and data teams to deliver impactful technical solutions.

You will contribute to code quality through testing and reviews, participate in code-driven CI/CD using GitHub Actions and AWS, and help push

Qualifications

• Proven experience shipping production software in a professional setting.
• Strong proficiency in C# with async/await, LINQ and generics.
• Experience with ASP.NET MVC and Web API on .NET Framework 4.8.
• Familiar with modern .NET (.NET 10) and ASP.NET Core MVC.
• Experience building web apps with HTML5, CSS3 and JavaScript.
• Ability to debug and troubleshoot in production environments.
• Write clean, testable code; unit testing with xUnit/NUnit/MSTest.
• Proficient in Git, Visual Studio and NuGet.
• Collaborative in cross-functional teams; strong problem-solving mindset.
• Experience with React and TypeScript.
• Knowledge of SQL and EF/EF Core.
• Exposure to .NET Framework to .NET migrations.
• Familiarity with CI/CD tools GitHub Actions and Jenkins.
• Interest in AI technologies and ethical AI usage.
• Hands-on AI tools to streamline workflows.

Responsibilities

• Maintain and evolve high-scale .NET applications supporting financial decision-making.
• Troubleshoot production incidents and analyze logs and code.
• Identify performance improvements and code quality enhancements.
• Design and deliver new features aligned with architecture and standards.
• Collaborate with product, design and data teams on technical solutions.
• Ensure high-quality, maintainable code through testing and reviews.
• Contribute to technical documentation and share knowledge with the team.

Skills

Production software shipping

C# async/await

LINQ

Dependency injection

ASP.NET MVC

ASP.NET Core MVC

HTML5/CSS3/JavaScript

Debugging in production

Unit testing (xUnit/NUnit/MSTest)

Git

Visual Studio

NuGet

Cross-functional teamwork

Problem solving & debugging

React & TypeScript

SQL & EF/EF Core

Migration from .NET Framework to .NET

CI/CD (GitHub Actions, Jenkins)

AI tools usage in workflows

Education

Strong technical foundation through formal education or hands-on experience

Tools

Git

Visual Studio

NuGet

GitHub Actions

Jenkins

EF Core

Job description

At Moody's, we unite the brightest minds to turn today’s risks into tomorrow’s opportunities. We do this by striving to create an inclusive environment where everyone feels welcome to be who they are—with the freedom to exchange ideas, think innovatively, and listen to each other and customers in meaningful ways. Moody's is transforming how the world sees risk. As a global leader in ratings and integrated risk assessment, we’re advancing AI to move from insight to action—enabling intelligence that not only understands complexity but responds to it. We decode risk to unlock opportunity, helping our clients navigate uncertainty with clarity, speed, and confidence.

Skills And Competencies

• Proven experience shipping production software (2+ years).
• Strong proficiency in C# including async/await, LINQ, generics, dependency injection, and modern language features.
• Experience with ASP.NET MVC and Web API on .NET Framework 4.8.
• Working knowledge of modern .NET (.NET 10) and ASP.NET Core MVC.
• Experience building web applications using HTML5, CSS3, and JavaScript.
• Experience working with and understanding existing codebases, including debugging and troubleshooting in production environments.
• Ability to write clean, testable, and maintainable code, supported by unit testing frameworks such as xUnit, NUnit, or MSTest.
• Proficiency with Git, Visual Studio, and NuGet.
• Strong collaboration skills and ability to work effectively in a cross-functional environment.
• Strong problem-solving mindset with rigor in debugging and root-cause analysis.
• Experience with React and TypeScript.
• Basic knowledge of SQL and Entity Framework / EF Core.
• Exposure to .NET Framework to .NET migration projects.
• Familiarity with CI/CD practices and tools such as GitHub Actions and Jenkins.
• Curiosity about emerging technologies, including AI and modern developer tools.
• Demonstrated proficiency in artificial intelligence concepts, with hands-on experience using AI tools to streamline workflows and enhance operational efficiency. Proven ability to implement AI-powered solutions to solve business challenges. Demonstrates a growing awareness of AI risk management and a commitment to responsible and ethical AI use.

Education

• Strong technical foundation built through formal education, self-directed learning, or hands-on professional experience.

Responsibilities

Contribute to the ongoing success of Orbis by enhancing, maintaining, and evolving high-scale .NET applications that support critical financial decision-making for thousands of clients worldwide.

• Maintain and support existing .NET Framework 4.8 and .NET 10 applications, ensuring their stability, reliability, and performance in production.
• Investigate, troubleshoot, and resolve bugs and production incidents by analyzing application behavior, logs, and code.
• Identify and implement performance optimizations and code quality improvements across existing applications.
• Design and deliver new features and enhancements aligned with established architecture, development standards, and business needs.
• Collaborate closely with product, design, and data teams to define and deliver impactful technical solutions.
• Ensure high-quality, maintainable code through testing, code reviews, and continuous integration practices.
• Contribute to technical documentation and actively share knowledge to support team effectiveness and application ownership.

About The Team

You’ll join the Digital Content & Innovation group at Moody's Analytics, the engineering organization behind moodys.com and the teams responsible for delivering innovative data and technology solutions to global financial markets. The team behind Orbis manages one of the industry’s most comprehensive company information platforms, providing access to data on more than 654 million companies and entities worldwide. Our engineering teams follow a modern development model built on trunk-based development, code-driven CI/CD using GitHub Actions and AWS, and clear ownership through Tech Leads and Tech Owners. Engineering excellence, AI-augmented workflows, continuous improvement, and responsible technology practices are core to how we build and operate our products.

Moody's is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected veteran status, sexual orientation, gender expression, gender identity or any other characteristic protected by law.

Candidates for Moody's Corporation may be asked to disclose securities holdings pursuant to Moody's Policy for Securities Trading and the requirements of the position. Employment is contingent upon compliance with the Policy, including remediation of positions in those holdings as necessary.