Senior Software Engineer C#, Angular

3Pillar is an AI transformation partner on a mission to help enterprises build the AI-native products and intelligent agents that will define the next era of business. With teams across North America, Europe, Latin America, and Asia, we work with the most ambitious companies in financial services, healthcare, media, and technology — helping them move faster, modernize boldly, and compete on their own terms. Our HelixAI platform and Helix Pods delivery model put our engineers at the center of real agentic transformation — doing work that is open, portable, and built to last. We are building the future of enterprise AI.

Key Responsibilities

Craft client code that is not just efficient but also performant, testable, scalable, secure, and of the highest quality.

Gather requirements, validate their understanding amongst the team, and create and maintain relevant documentation.

Execute activities within the current methodology and uphold the highest quality standards.

Foster collaboration with fellow engineers, designers, and managers to comprehend user pain points and iterate on solutions that drive client success.

Minimum Qualifications:

Demonstrated expertise with at least 10+ years of experience in one specified technology.

C#

.NET (.NET Framework and .NET Core / modern .NET), ASP.NET Core Web API, relational databases and SQL, with front-end experience in Angular.

Experience modernizing legacy .NET Framework applications, including moving business logic into APIs or services and migrating to the cloud.

Experience in engineering software systems of medium-to-large scope and complexity.

Hands-on experience with Node.js and Angular, including upgrading Angular applications across versions.

Experience integrating with Microsoft Dynamics (ERP and/or payroll).

Experience designing and building RESTful APIs.

Familiarity with Agile software development methodologies.

Proficiency with relational databases and SQL.

Experience in building frontend/backend applications at scale.

Experience with cloud platforms (AWS and Azure).

Proficiency in the English language.

Desired:

Experience with business rules engines or externalizing business rules from application code.

Domain experience in billing, claims processing, or payroll systems, ideally in healthcare or home care.

Experience with .NET desktop applications (WinForms/WPF) and migrating them to the cloud.

Experience with unit testing (e.g., xUnit, NUnit, MSTest).

Knowledge of source control tools (e.g., Git).

Proficiency in Object-Oriented Programming (inheritance, polymorphism, classes, instances, properties).

Knowledge of protocols like HTTP, and serialization formats like JSON and XML.

Understanding of Software Development Life Cycle (SDLC).

Knowledge of document databases.