Backend .NET Engineer

Role Description

You’ll join the engineering group delivering across three of our most visible program areas: the Managed Enterprise Services (MES) suite — spanning CCT, CBPC, Document Center, and EAC — the CBA side of AIX, and our Digital Convergence initiative (CVG / MA360). These are interconnected, business-critical applications, so the backend work here is high-leverage and highly visible.

What makes this role compelling is how we build, not just what we build. We’re an early adopter of Spec-Driven Development (SDD) using OpenSpec: every change begins from a clear, version-controlled specification that the team — and our AI coding assistants — agree on before a line of code is written. Engineers here shape the spec, not just the implementation, which means less rework, a traceable decision history, and consistent patterns across a large, evolving codebase.

As a backend engineer, you’ll own .NET services end-to-end — from authoring the spec to shipping and operating production code — while mentoring teammates and helping mature our SDD practice. If you enjoy modern .NET at real scale, an AI-augmented workflow, and being able to point to systems that matter, this is a strong fit.

Qualifications

• 5–7 years of professional backend software development.
• Strong, demonstrable proficiency in C# and the .NET stack (ASP.NET Core Web API).
• Experience designing REST APIs and working with relational databases (SQL, EF Core).
• Working knowledge of CI/CD, automated testing, version control (Git), and at least one cloud platform (Azure preferred).
• Comfort with — or strong aptitude for — spec-first / specification-driven workflows; direct OpenSpec or comparable SDD experience is a plus.
• Strong collaboration and communication skills.
• Experience with AI-native development tools, such as OpenSpec or comparable frameworks (e.g., GitHub Spec Kit).

Requirements

• Author and refine OpenSpec artifacts — proposals, requirement specs, design notes, and task breakdowns.
• Design, build, and maintain backend services and APIs in C# / ASP.NET Core, including data access with SQL and Entity Framework Core.
• Use AI coding assistants effectively, driven by approved specs, to accelerate delivery without sacrificing quality.
• Write automated tests and ship through CI/CD pipelines; support deployment and operation of services in the cloud.
• Review peers’ specs and code, mentor less-experienced engineers, and help mature the team’s SDD practice.
• Collaborate with product, QA, and other engineering teams to translate ambiguous requirements into precise, buildable specifications.
• Collaborate with cross-functional teams to design, develop, and integrate innovative software solutions that align with business needs.
• Conduct analysis of system requirements and customize applications to ensure optimal functionality.
• Assist with the software update process for existing applications and roll-outs of software releases.
• Mentor junior engineers, fostering a culture of technical excellence and shared knowledge within the team.
• Engage with Quality Assurance to verify that software meets technical specifications and deliver high-quality, reliable applications.
• Troubleshoot and resolve complex technical issues in software applications and systems.
• Synthesize market research and industry trends to inform project strategies and enhance product offerings.
• Conduct training sessions for operational staff to ensure effective use of internally developed applications.
• Consistent exercise of independent judgment and discretion in matters of significance.
• Regular, consistent and punctual attendance.
• Other duties and responsibilities as assigned.

Benefits

• Array of options for physical, financial, and emotional support.
• Expert guidance and always-on tools personalized to meet individual needs.

Education

• Bachelor's Degree preferred; combination of coursework and experience or extensive related professional experience may be considered.

Certifications

• Relevant Work Experience: 5-7 Years.

Company Description

Comcast is an equal opportunity workplace. We will consider all qualified applicants for employment without regard to race, color, religion, age, sex, sexual orientation, gender identity, national origin, disability, veteran status, genetic information, or any other basis protected by applicable law.