Lead Software Engineer (.NET / Azure / React)

Rebus Energy Solutions is expanding its engineering team with a hands-on Lead Software Engineer who will shape VANTAGE, the enterprise SaaS platform powering critical logistics and dispatching for the energy sector. This on-site role in Englewood, Colorado blends active coding in C# and React with technical leadership to modernize the frontend, architect cloud-native Azure solutions, and mentor a growing team of engineers. The position offers a salary range of USD 130,000 to 160,000 per year.

Responsibilities

• Design and develop the enterprise SaaS platform while actively contributing production-quality C# and React code.
• Lead the migration of the DevExtreme/Knockout.js application to React.
• Architect cloud-native solutions using Azure, microservices, and asynchronous messaging.
• Review pull requests, mentor engineers, and elevate engineering standards.
• Improve testing, CI/CD, observability, documentation, and performance.
• Evaluate and adopt AI-assisted development tools and modern engineering practices to enhance software quality and team productivity.

Requirements

• Proven success designing, developing, and deploying enterprise SaaS applications with C# and .NET.
• Experience leading complex technical initiatives from architecture through production.
• Strong background with microservices, REST APIs, and asynchronous messaging.
• Hands-on experience building cloud-native solutions on Microsoft Azure.
• Solid SQL Server performance tuning and React/TypeScript development skills.
• Experience modernizing enterprise applications and migrating legacy frontend frameworks to React.
• Familiarity with CI/CD, automated testing, code reviews, and engineering best practices.

Technologies

• C#, .NET 8+, ASP.NET Core, SQL Server, Entity Framework Core, Microservices & Messaging
• React, TypeScript, DevExtreme React, Knockout.js (migrating)
• Microsoft Azure, Azure DevOps, Git, Docker, Kubernetes
• Azure Service Bus, RabbitMQ, Kafka, Redis, SignalR
• GitHub Copilot, Cursor, ChatGPT, DevExtreme React Components

Benefits

• 401(k)
• 401(k) matching
• Paid time off

About Rebus Energy Solutions

Rebus Energy Solutions develops VANTAGE, an enterprise SaaS platform that powers mission-critical logistics, dispatching, workflow automation, invoicing, regulatory reporting, integrations, and real-time operational workflows for the energy industry. For more than a decade, VANTAGE has evolved into a comprehensive enterprise platform. As the company grows, there is a strong focus on cloud technologies, modern engineering practices, AI-assisted software development, and stack modernization. The organization is founder-led and highly collaborative, with founders actively involved in software architecture, product design, code reviews, and technical decision-making. The team operates as a distributed, agile group across the United States and India, ensuring every engineer has a voice and a meaningful impact.

Work Environment

The team values in-person collaboration and believes some of the best engineering work happens when architects and developers brainstorm together, review code, and tackle complex decisions side by side. The role is based in our Denver office, where you’ll work closely with the founders and the local engineering squad while coordinating daily with teammates in India.

About the Role

This is a hands-on technical leadership position. The ideal engineer thrives on solving challenging technical problems, designing scalable systems, and delivering production-quality code. Success means spending the majority of your day actively building software, reviewing pull requests, and mentoring peers, rather than solely coordinating work or managing projects.

Who Will Thrive Here

• Think like an owner and take pride in the product’s success.
• Proactively improve systems, processes, and code quality without waiting for permission.
• Are excited by the opportunity to help build a growing company, not just complete tasks.
• Are naturally curious, continuously learning new technologies, and elevate the team’s baseline.
• Lead by example through technical excellence.

Preferred Technical Experience

• Experience with DevExtreme React Components and/or legacy Knockout.js.
• Experience with Docker and Kubernetes.
• Azure Service Bus, RabbitMQ, Kafka, or distributed caching (Redis).
• SignalR or real-time communication technologies.
• Active use of AI-assisted tools (GitHub Copilot, Cursor, ChatGPT) within daily workflows.

Our Technology Stack

• Backend: C#, .NET 8+, ASP.NET Core, SQL Server, Entity Framework Core, Microservices & Messaging
• Frontend: React, TypeScript, DevExtreme React, legacy Knockout.js (migrating)
• Cloud & DevOps: Microsoft Azure, Azure DevOps, Git, CI/CD Pipelines, Docker (preferred)

Why Join Rebus?

• Founder-Led, Engineering-First: Work directly with technical founders who remain actively involved in architecture, product direction, and technical decision-making.
• High Impact: Join a small, agile engineering team where your ideas, leadership, and code directly shape a platform relied upon by enterprise customers.
• Shape the Future: Drive the modernization of a mature enterprise SaaS platform while helping to build the company itself.