Senior .NET Backend Engineer: AI-Driven, Spec-First API

Blueface Ltd; Philadelphia (Philadelphia County); On-site; USD 90,000 - 120,000; Full time

Job summary

Blueface Ltd is looking for a backend engineer to join Comcast’s technology team. You will be responsible for delivering across high-visibility program areas, owning .NET services from specifications to production code. Your role involves designing and maintaining backend services and APIs in C# / ASP.NET Core, while mentoring teammates and collaborating with other teams.

The ideal candidate will have 5–7 years of backend software development experience and strong communication skills.

Qualifications

• 5–7 years of professional backend software development experience.
• Strong proficiency in C# and the .NET stack.
• Experience designing REST APIs and working with relational databases.

Responsibilities

• Author and refine OpenSpec artifacts and implement them as the source of truth.
• Design, build, and maintain backend services and APIs in C# / ASP.NET Core.
• Use AI coding assistants effectively to accelerate delivery.

Skills

C#

ASP.NET Core

REST APIs

SQL

Entity Framework Core

CI/CD

Git

Azure

OpenSpec

Job description

Blueface Ltd is looking for a backend engineer to join Comcast’s technology team. You will be responsible for delivering across high-visibility program areas, owning .NET services from specifications to production code. Your role involves designing and maintaining backend services and APIs in C# / ASP.NET Core, while mentoring teammates and collaborating with other teams.

The ideal candidate will have 5–7 years of backend software development experience and strong communication skills.