Senior .NET Developer (Billing Platform)

Vaco by Highspring invites you to join the Orlando, FL team as a Senior .NET Developer focused on a billing platform. This onsite role offers a competitive annual salary of USD 120,000 to 125,000 and the chance to influence high‑volume, mission‑critical systems. You will help build and scale backend services, collaborate across the full software lifecycle, and translate business needs into robust technical solutions within a culture that prioritizes ownership, quality, and continuous improvement.

Responsibilities

• Contribute to the development of a billing and claims platform that supports high‑volume transactional workloads
• Build and scale backend services and enterprise applications
• Improve and evolve existing systems and architecture
• Design scalable, maintainable, and extensible solutions
• Engage across the full SDLC, including design, development, testing, and deployment
• Collaborate cross‑functionally to translate business requirements into technical solutions
• Ensure code quality through test automation
• tackle complex domain‑driven problems and system integrations

Requirements

• Strong experience with .NET / C#
• Experience with MS SQL Server and relational databases
• Background developing service‑based / API‑driven applications
• Experience with ASP.NET Core
• Familiarity with Entity Framework / EF Core
• API development tools: REST APIs, Swagger, Postman
• Frontend SPA frameworks: Angular or React
• TypeScript, Node.js, Webpack
• Authentication: OAuth / JWT
• Architecture & Systems: Microservices architecture
• Distributed systems
• High‑volume, event‑driven / queued workflows
• Messaging tools such as RabbitMQ
• Testing: Unit testing / test automation

Technologies

• .NET / C#
• MS SQL Server
• ASP.NET Core
• Entity Framework / EF Core
• REST APIs
• Swagger
• Postman
• Angular
• React
• TypeScript
• Node.js
• Webpack
• OAuth
• JWT
• Microservices architecture
• Distributed systems
• High‑volume, event‑driven / queued workflows
• RabbitMQ
• Unit testing / test automation

Key Traits

• Strong problem‑solving skills
• Ownership mindset over applications and systems
• Focus on building high‑quality, scalable solutions
• Continuous improvement mindset