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

**************************** 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). 3. Legacy Application Refactoring 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 backendDemonstrated, 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 toolHands-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 preferenceStrong SQL Server skills (schema design, performance tuning, migration scripting)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 platformPrior consulting/professional-services background across multiple concurrent clientsFamiliarity with legal, financial services, or another regulated industry's compliance constraints Pay: $100,000.00 - $145,000.00 per year