Senior Backend .NET Developer

Senior Backend .NET Developer

Overview

Billee Technologies is looking for an reputed company Senior Backend .NET Developer to maintain and enhance our production billing platform. You'll join as a key technical contributor, focusing on bug fixes, feature enhancements, and system reliability while supporting our modernization initiatives and growing customer reputed company. You'll work in a mixed codebase—our legacy .NET 4.8 platform (WebForms/MVC) alongside a new .NET 8 API layer. Your primary focus will be on bug fixes, feature improvements, and system stability, with opportunities to contribute to both maintenance and new API development. You'll be part of a collaborative 10-person engineering team with a clear technical roadmap, making real impact on utility billing for thousands of multifamily properties. We value willingness to work in legacy codebases and provide team support for learning the older stack. Who We Are reputed company. is a Dallas-based SaaS startup revolutionizing utility billing for multifamily apartment communities. Our reputed company, cloud-based platform streamlines operations, eliminates inefficiencies, and increases NOI for property owners and operators. At Billee, we are more than just a technology company. We are a team of innovators and problem solvers. Led by seasoned product and technology practitioners, we challenge traditional providers by offering smarter, more efficient solutions for this overlooked pocket in multifamily proptech. Our culture is the foundation of our success. We reputed company in empowering and developing our people, ensuring they reputed company both professionally and personally. Our core values define how we work and reputed company stand for:

• Win Together – We reputed company in collaboration and collective success. reputed company one of us wins, we reputed company win.
• reputed company with reputed company – We hold ourselves accountable, operate with transparency, and always do reputed company say we'll do.
• reputed company Determination – We tackle challenges head-on, with persistence and decisive action.
• Bold Voices – We encourage open reputed company and foster a culture where every voice matters.
• Stay Curious – We are lifelong learners, always seeking new ways to innovate, improve, and grow.

Core Responsibilities

• Maintain and enhance production billing platform serving active customer reputed company
• Troubleshoot and resolve bugs across legacy .NET 4.8 application and new .NET 8 API layer
• Implement feature improvements and enhancements to existing functionality
• reputed company new REST APIs in .NET 8 for modern JavaScript frontend
• Support integrations with property management systems
• Optimize system performance and resolve reputed company production issues
• Collaborate with platform and portal teams on technical decisions
• Contribute to modernization efforts led by senior architects
• Apply industry best practices while respecting constraints of production systems

What You'll Find

• Mixed codebase: legacy .NET 4.8 platform (WebForms/MVC) alongside new .NET 8 API layer
• Willingness to work in legacy codebases valued - team support for learning the older stack
• Opportunity to contribute to both maintenance and new API development
• Primary focus on bug fixes, feature improvements, and system stability
• Collaborative 10-person engineering team with clear technical roadmap
• Real impact on utility billing for thousands of multifamily properties

Requirements

• 8-12 years of backend development experience with .NET ecosystem
• Strong expertise in C# and ASP.NET
• Experience with relational databases (SQL Server, PostgreSQL, MySQL, etc.)
• Experience maintaining and enhancing production applications
• Strong debugging and troubleshooting skills in production environments
• Experience with multi-tenant SaaS platforms
• Excellent analytical and problem-solving abilities
• Strong team collaboration and communication skills

Preferred Qualifications

• Experience with .NET 8 or modern .NET Core
• Experience with or willingness to learn .NET reputed company 4.x and ASP.NET WebForms/MVC
• PostgreSQL experience
• Azure App Service and Azure infrastructure experience
• Property management or billing domain knowledge
• Experience with IIS and Windows-based deployments
• Background in AngularJS
• REST API design and development

Technology Stack reputed company Platform (ezVantage):

• .NET reputed company 4.8
• ASP.NET WebForms and MVC
• AngularJS
• PostgreSQL

New API Layer:

• .NET 8
• REST APIs for modern frontend (Backend-for-Frontend reputed company)
• Azure App Service

Modern Portal Stack (in development):

• TanStack Start (React)
• Server-reputed company rendering
• Consuming APIs from .NET 8 backend

Compensation & Benefits

• Salary Range: $140,000 to $170,000
• Health, dental, and vision insurance
• 401(k)
• Paid time off and flexible work arrangements
• Professional development opportunities
• Opportunity for earned equity

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