Senior .NET Software Engineer — Ashburn, VA

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Job details:

Senior .NET Software Engineer, $180,000 to $200,000 per year, Mostly Hands-On Coding, LLM and Agentic Features in Production

This GDYVA 3Ep is hosted by: Charles Simmons

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Salary: $180,000 - $200,000 per year

A bit about us:

We are a technology company that helps state and local governments replace paper-based processes with AI-driven digital workflows. Our work centers on modernizing how public agencies handle their everyday operations, turning manual, paper-heavy steps into digital systems. Our platform is built on .NET and is currently moving toward a microservices architecture, and we are adding LLM and agentic capabilities to products already in production.

Why join us?

• Competitive compensation: $180,000 to $200,000 per year

• 401(k) plan with a 4% employer match

• Medical, dental, and vision coverage with significant employer contributions for employees and dependents, plus company-sponsored life, short-term, and long-term disability insurance

• 11 paid holidays and flexible time off

• Mostly hands-on coding with a light coordination load

• Technical ownership of a delivery pod's releases, plus coaching mid-level and junior engineers

• Monthly stipend for home office expenses

Job Details

This Senior .NET engineer role leads delivery for a small engineering pod while spending most of the week writing production code. You'll build AI capabilities into product features, review all of the team's code, and coach mid-level and junior engineers.

Key Responsibilities:

• Run the team's delivery from start to finish: break down scope, sequence the work, track dependencies and ship releases

• Write production .NET code every week, covering services, APIs and data access in a mature codebase

• Build AI capabilities into product features, including agentic workflows, retrieval-augmented generation, structured extraction and tool calling, with evaluations and tracing included

• Act as the team's reviewer of record for all code, including code written by AI agents

• Lead a short planning and review cycle built on written plans, stated assumptions and visible open questions

• Oversee the team's use of AI agent and delivery tooling, setting guardrails and escalating failures that need human judgment

• Coach mid-level and junior engineers as they work through their own designs

• Track and manage the team's technical debt, documenting what is intentionally left unfixed

• Own production quality, latency and cost for the team's features, including postmortems

• Raise designs that grow beyond the team's scope with the architecture group early

Needed:

• Minimum 7 years of experience building and shipping production software

• Strong background in .NET and C# development (•••••••• Core, Entity Framework Core, async patterns, performance and profiling)

• Experience as a senior engineer on a pod, squad or feature team while staying hands-on in code

• Experience refactoring a large, mature codebase (strangler patterns or extracting services from a monolith)

• Experience with retrieval-augmented generation (RAG) and embeddings

• Proven ability to integrate LLM-backed features into a shipping product (prompt and context engineering, tool calling, structured outputs, evaluations)

• Azure (AKS, App Service, Service Bus, SQL)

• CI/CD pipelines (GitHub, Octopus Deploy or similar)

• US citizenship

Nice to have:

• Experience in government, healthcare or another regulated environment

Interested in hearing more? Easy Apply now by clicking the "Easy Apply" button.

4rKpx is an Equal Opportunity Employer. We provide an inclusive work environment that celebrates diversity and all qualified candidates receive consideration for employment without regard to race, color, sex, sexual orientation, gender identity, religion, national origin, age (40 and over), disability, military status, genetic information or any other basis protected by applicable federal, state, or local laws. 4rKpx also prohibits harassment of applicants or employees based on any of these protected categories. It is WHWx3’a policy to comply with all applicable federal, state and local laws respecting consideration of unemployment status in making hiring decisions.

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