Services
What we build
SJ GRP LLC delivers software engineering across three core disciplines. Engagements can combine all three or focus on exactly what you need.
Custom .NET / C# Development
We design and build production software on the .NET platform — web APIs, background services, integrations, and complete line-of-business applications. Our focus is code that is correct, tested, and comfortable to maintain long after delivery.
Representative tech: .NET, C#, ASP.NET Core, Entity Framework
What's included
- ASP.NET Core APIs & web applications
- Domain modeling & business logic
- Database design (SQL Server, PostgreSQL)
- Automated testing & CI pipelines
Software Architecture
We help teams design systems that stay adaptable as they grow. Using domain-driven design and hexagonal/clean architecture, we establish clear boundaries between business logic and infrastructure so your software can evolve without costly rewrites.
Representative tech: DDD, Hexagonal Architecture, CQRS, Event-driven design
What's included
- Domain-driven design & bounded contexts
- Hexagonal / clean architecture
- System & API design
- Architecture review & modernization
AI / LLM Integration
We bring large language models into real products in a way that is practical and reliable. From retrieval-augmented generation to workflow automation, we integrate AI where it adds genuine value — with attention to accuracy, cost, and maintainability.
Representative tech: LLM APIs, RAG, vector search, orchestration
What's included
- Retrieval-augmented generation (RAG)
- LLM orchestration & prompt design
- Integration into existing .NET systems
- Evaluation & guardrails
How we work
A clear engagement model
1. Understand
We start with your goals and constraints, then scope the work precisely.
2. Build
Iterative delivery with tested code, transparent progress, and regular review.
3. Support
Documentation and handover so your team can own and extend the result.