Senior C#/.NET Engineer - Full-Stack (Vue.js)

Threecolts LLC; United States; Remote; USD 120,000 - 170,000; Full time

Job summary

Threecolts is seeking a senior software engineer to own features across our .NET backend and modern frontend work. You'll design, implement, and maintain scalable services using C#, ASP.NET Core, and Vue.js, delivering end-to-end from data models to polished UI.

You will collaborate with Product, QA, and DevOps, apply best practices, and help evolve our architecture across cloud environments (AWS or Azure).

Qualifications

• 6–8+ years of professional software engineering experience.
• Strong proficiency in C# and production-grade applications.
• Experience with the .NET platform, runtime, libraries, and application development ecosystem.
• Experience developing web applications and backend services using ASP.NET and ASP.NET Core.
• Experience developing modern web applications using Vue.js or React, with component-based architecture.

Responsibilities

• Own features across C# and .NET-based systems, delivering from initial design through to production; design, develop, and maintain backend services, APIs, and components using C# and the .NET ecosystem.
• Work with modern .NET technologies, including ASP.NET and ASP.NET Core, to build reliable, high-performance web applications and services.
• Develop front-end features using Vue.js and TypeScript, building responsive, intuitive interfaces that integrate with backend APIs; take end-to-end ownership from backend design to UI implementation.
• Operate independently within a defined scope, make pragmatic technical decisions, and balance delivery speed with long-term quality; debug production issues and implement durable fixes.
• Collaborate with Product, QA, and DevOps to deliver features and improvements that provide meaningful value to clients.

Skills

C#

ASP.NET

ASP.NET Core

Vue.js

TypeScript

SQL

Cloud (AWS/Azure)

REST APIs

Job description

Threecolts is seeking a senior software engineer to own features across our .NET backend and modern frontend work. You'll design, implement, and maintain scalable services using C#, ASP.NET Core, and Vue.js, delivering end-to-end from data models to polished UI.

You will collaborate with Product, QA, and DevOps, apply best practices, and help evolve our architecture across cloud environments (AWS or Azure).