Our client Orange Tree Systems is looking for DotNet Developer / VB.net in Lahore.

As a .NET Engineer, you will lead the design and delivery of scalable, secure, and high-performance backend systems powering web, desktop mobile, and multi-platform applications. In this role, we are specifically looking for a developer with strong VB.NET experience, as a key part of the work involves migrating an existing project written in VB.NET.

What You'll Do
Backend Engineering

• Design, build, test, and maintain backend services and REST/GraphQL APIs using .NET (ASP.NET Core).
  
• Work on the migration of legacy VB.NET applications into modern C# .NET Core architecture.
  
• Analyze, refactor, and modernize existing code while preserving business logic and system stability.
  
• Implement secure authentication and authorization using OAuth2, OpenID Connect, JWT, and industry-standard identity providers.
  
• Integrate internal services and third-party systems with a focus on security, resilience, performance, and data integrity.
  

Quality, Collaboration & Operations

• Apply engineering best practices including clean architecture, testing, documentation, and performance optimization.
  
• Participate in code reviews, design discussions, and architectural decision-making.
  
• Troubleshoot production incidents, perform root-cause analysis, and implement long-term fixes.
  
• Collaborate cross-functionally to deliver business-critical features with high reliability.
  

Background & Qualifications

• 7+ years of backend engineering experience with strong depth in .NET.
  
• Strong hands-on experience with VB.NET and proven experience working on migration or modernization projects.
  
• Expert proficiency in C#, ASP.NET Core, and API design (REST; GraphQL is a plus).
  
• Strong experience in SQL Server/PostgreSQL, including schema design and performance tuning.
  
• Hands-on experience with Azure cloud services and cloud-native development.
  
• Understanding of microservices, event-driven architecture, distributed systems, and reliability principles.
  
• Experience with CI/CD, version control, and automated testing.
  
• Docker/Kubernetes experience is a plus.
  
• Healthcare domain experience (e.g., EHR/EMR, HL7, FHIR, pharmacy or healthcare platforms) is a strong advantage.
  

Technology Stack

• Backend: .NET / ASP.NET Core (Web API, MVC), microservices
  
• Legacy / Migration Focus: VB.NET to C# .NET Core
  
• Frontend Exposure: React, Angular, Blazor
  
• Databases: SQL Server, PostgreSQL, Cosmos DB
  
• DevOps: Docker, Kubernetes, CI/CD
  
• Architecture: Microservices, event-driven systems, distributed services
  

What We're Looking For

• Migration-Focused Developer: Comfortable working with legacy VB.NET systems and modernizing them into scalable .NET Core solutions.
  
• System Thinker: Designs secure, scalable systems with strong engineering fundamentals.
  
• Strong Ownership: Drives delivery end-to-end and raises the quality bar.
  
• Collaborative Builder: Communicates clearly and works effectively across teams.
  
• Quality Focused: Writes clean, testable, maintainable code and improves existing systems.
  
• Adaptable: Learns quickly and applies modern tools, patterns, and cloud services.
  

Why Join Orange Tree Systems

• Build healthcare technology that creates real-world impact
  
• Work with a fast-growing, highly skilled engineering team
  
• Deep exposure to Azure, scalable backend systems, modernization initiatives, and modern DevOps practices
  
• Opportunity to shape architecture, performance, and long-term platform direction
  
• Play a key role in the transformation of a legacy healthcare pharmacy platform into a modern engineering ecosystem