Sr .Net Developer

eSolutionsFirst, LLC; Vienna (VA); On-site; USD 140,000 - 190,000; Full time

Job summary

eSolutionsFirst, LLC seeks a senior .NET developer for AI enablement in Vienna, VA. You will craft Azure-based microservices and frontend apps using C#/.NET 8, React, and Next.js 15, delivering real-time features and ERP integrations.

The role requires 12+ years in software development, API-first design, and strong security/observability practices. Contract engagement with potential for AI tool integration and scalable architectures.

Qualifications

• 12+ years of software development experience.
• Expertise in Azure-native architectures (Azure Functions, Azure SQL, Service Bus).
• Strong C# .NET 8 with REST API design and EF Core.
• Strong React/TypeScript/Next.js 15 with App Router, RTK Query, Tailwind CSS.
• Experience integrating with ERP systems (Dynamics NAV/Business Central preferred).
• Experience designing real-time systems (SignalR/WebSockets).
• OpenAPI/Swagger specification authoring and API-first development.
• Security: OWASP Top 10 familiarity, Azure Key Vault, managed identities.
• Observability: Application Insights, metrics, alerting.

Responsibilities

• Design and develop end-to-end multi-module web apps.
• Implement Azure-based backend services and frontend components.
• Create real-time features using SignalR or WebSockets.
• Author OpenAPI specs and drive API-first development.
• Collaborate with ERP integrations and CI/CD workflows.

Skills

C# .NET 8

REST API design

React

TypeScript

Next.js 15

App Router

RTK Query

Tailwind CSS

Component library

Azure Service Bus

Azure SQL

SQL Server

EF Core

xUnit testing

OAuth2/OIDC

SignalR

WebSockets

OpenAPI

Swagger

Dynamics NAV

Education

12+ years of software development experience

Tools

Azure Functions

SSDT

MSAL

Swagger/OpenAPI tooling

GitHub Copilot

Job description

Role: .Net Developer (AI Enablement)

Duration :: Contract

Location: Vienna, VA

Required skills :

12+ years of software development experience.

• Deepexpertisein Azure-native architectures: Azure Function Apps (isolated worker model), Azure SQL, Azure Service Bus, Azure AD / MSAL (OAuth2/OIDC)
• Strong C# .NET 8 — Azure Functions, Entity Framework Core,xUnittesting, REST API design
• Strong React / TypeScript / Next.js 15 — App Router, RTK Query, Tailwind CSS,componentlibrary patterns
• Azure SQL / SQL Server schema design — SSDT projects, query optimization, multi-tenant schema isolation
• Experience integrating with ERP systems (Microsoft Dynamics NAV / Business Central strongly preferred)
• Proven experience designing real-time systems (SignalR,WebSockets, or equivalent)
• OpenAPI/Swagger specification authoring and API contract-first development

AI & Tooling

• Hands-on experience with Claude Code, GitHub Copilot, or equivalent AI coding assistants in production development workflows
• Demonstrated ability to prompt LLMs effectively using structured specifications and to critically evaluate generated output
• Familiarity with AI-assisted test generation and automated code review tooling

Architecture & Process

• Track recorddelivering complex, multi-module web applications end-to-end
• Experience with message-driven integration patterns (Azure Service Bus, event-driven architecture, dead-letter handling)
• Security-conscious mindset: OWASP Top 10 familiarity, managed identity patterns, Azure Key Vault
• Observability and monitoring: Application Insights instrumentation, custom metrics, alerting design

Preferred Qualifications

• Experience in food production,logistics, or warehouse management systems
• Familiarity withTeklynxSentinel, Zebra label printing APIs, or industrial hardware integration
• Experience with the DEP (Data Exchange Platform) or similar NAV middleware patterns
• Contributions to or opinions on AI coding tool evaluation and team adoption playbooks
• Azure certifications (AZ-204, AZ-305 or equivalent)