AI + .NET Full Stack Developer (SharePoint) — Legacy Modernization & Cloud Migration

Brxio Inc; Chicago (IL); Hybrid; USD 120,000 - 170,000; Full time

Job summary

Brxio Inc. is seeking a senior, hands-on .NET Full Stack Developer to lead modernization initiatives, including source control migration, SharePoint to GCC cloud migration with AI-powered search, and legacy refactoring.

This role requires designing the target architecture, not just execution, with regular onsite/hybrid presence in major US tech hubs. You will architect solutions, implement modern .NET (NET 8+) APIs with React frontends, and navigate security/compliance boundaries in a

Qualifications

• 7+ years of professional full-stack development experience.
• 3+ years with React (or a comparable modern SPA framework) paired with a .NET backend.
• Hands-on experience migrating from TFS/SVN to Git-based platforms; owning architecture.
• Experience with Microsoft 365 GCC High security and compliance.
• Experience with AI-powered enterprise search implementations (Azure AI Search).

Responsibilities

• Design and document the target architecture for source-control modernization.
• Lead SharePoint→GCC cloud migration with AI-powered search.
• Refactor legacy VB.NET/Web Forms into modern .NET APIs and React frontends.
• Be prepared to complete a technical assessment and live discussion to verify depth.

Skills

React

.NET

Full stack development

Architecture design

Tools

Git-based platform

TFS/SVN migration tools

Azure AI Search

Job description

**************************** CANNOT SPONSOR WORK VISA ************************

*********************** Law firm experience is desirable *******************

Company Description

Brxio Software is a software development company dedicated to creating powerful and simple solutions. This position is for our client - a leading financial and professional services company, with footprint in multiple US cities.

Job Overview

We're looking for a senior, hands-on .NET Full Stack Developer to lead three concurrent modernization initiatives: enterprise source control migration, a SharePoint-to-GCC cloud migration with AI-powered search, and legacy application refactoring. This is not a maintenance role — you will be designing the target architecture, not just executing a checklist.

Location: This role requires regular onsite/hybrid presence with client teams and secure environments. Candidates must currently reside in, or be immediately willing to relocate at their own expense to, one of the following metro areas: New York City, Boston, Washington DC, Chicago, Los Angeles, or San Francisco. Remote-only applicants will not be deprioritized.

What You'll Actually Own

1. Source Control Modernization: TFS → GitHub You will not simply move repositories. You will design and document the target GitHub architecture from scratch: repo structure and ownership model, branching strategy, environment promotion flow, and required-reviewer policy, secrets management, and CI/CD pipeline design. Deliverable: a written architecture and migration runbook another engineer could execute from.

2. SharePoint → GCC Cloud Migration Migrate SharePoint content and permissions into a Google Cloud Platform (GCP) Government / Government Commercial Cloud (GCC / Assured Workloads)., correctly handling the security model differences, permission inheritance quirks, and compliance boundaries that don't exist in commercial M365. You will also evaluate and implement an AI-powered search layer (e.g., Copilot/Graph-based semantic search, Azure AI Search, or equivalent) to replace native SharePoint search — this is a stated priority, not a stretch goal:

• Lead content, data, and workflow migrations from legacy SharePoint environments into Google Cloud Platform (GCP) Government / Government Commercial Cloud (GCC / Assured Workloads).
• Navigate strict government security boundaries, IAM, compliance controls (FedRAMP/NIST), and GCP storage architectures.
• Implement AI Search: Replace default legacy SharePoint search with advanced AI-driven cognitive search using Google Vertex AI Search / Enterprise Search (vector search, semantic query processing, and RAG architectures).
• Unpack, analyze, and refactor complex legacy monoliths written in older .NET Frameworks (Web Forms, WCF, MVC) and legacy VB code (VB.NET / VB6).
• Re-architect legacy logic into modular, high-performance modern .NET (NET 8+) APIs with React frontends.

Responsibilities

To be direct: this role is scoped for someone who has actually done this work before, not someone who can describe it. Applications lacking verifiable specifics below will not be considered.

• 7+ years professional full stack development experience, including 3+ years with React (or a comparable modern SPA framework) paired with a .NET backend
• Demonstrated, describable experience with at least one enterprise source-control migration (TFS/SVN/other → Git-based platform) where you owned the target repo/branching architecture — not just ran the migration tool
• Hands-on experience with Microsoft 365 GCC or GCC High, including its security/compliance differences from commercial M365 (you should be able to speak to specific differences unprompted)
• Working experience with at least one AI-powered enterprise search implementation (Azure AI Search, Copilot/Graph connectors, or similar)
• Direct experience reading, maintaining, or migrating VB.NET or classic ASP.NET/WebForms code — this is a required skill, not a preference
• Must be prepared to complete a technical assessment: a scoped architecture and a live technical discussion where you walk through actual reasoning on a comparable migration/refactor scenario. This is how we verify hands-on depth — resume claims alone won't move you forward.

Nice to Have

• Experience with Boomi or another iPaaS platform
• Prior consulting/professional-services background across multiple concurrent clients
• Familiarity with legal, financial services, or another regulated industry's compliance constraints