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Freelance Asp Net Core Developer Jobs in Missouri

Avani Technology Solutions, Inc.

Sr.Developer

Creve Coeur, MO · On-site

$51.50 - $65.50/hr

Net Core, C#, GO, Mongo/SQL, API, KAFKA, XUnit, GITHUB, Jenkins, JIRA, and POSTMAN Must have skill: This individual must be hands-on and strong in C#,.net framework fundamentals Excellent in ...

The Timberline Group

C# / Angular Developer

Saint Peters, MO · On-site +1

$52.25 - $64/hr

We are seeking a skilled developer with strong expertise in C# and Angular for an on-site position ... NET. Core. Specifically this role needs expertise in C# and Angular. Reporting to the Web App ...

PopBookings

Senior ASP.NET Developer

Kansas City, MO · On-site

$53.25 - $70.25/hr

Ensuring a diverse and inclusive workplace where we learn from each other is core to PopBookings ... We are currently seeking a Senior ASP .NET Developer. This is an amazing opportunity to have real ...

PopBookings

Senior ASP.NET Developer

Kansas City, MO · On-site +1

$53.25 - $70.25/hr

Ensuring a diverse and inclusive workplace where we learn from each other is core to PopBookings ... We are currently seeking a Senior ASP .NET Developer. This is an amazing opportunity to have real ...

The Timberline Group

Xamarin Developer

Saint Louis, MO · On-site

$70 - $110/hr

Role Summary The Web Application Developer's responsibilities may include: * Providing team ... NET 4.5 * C# * ASP.NET MVC * Web API's * Entity Framework * Angular JS or Knockout * Strong ...

CarShield

AI Specialist

Saint Peters, MO · On-site

Hands-on experience with C# and ASP.NET Core/.NET. * Strong understanding of relational databases ... Bachelor's in Computer Science, Software Engineering, MIS, or equivalent experience. Pay Rate and ...

New

CarShield

AI Specialist

Saint Peters, MO · On-site

Hands-on experience with C# and ASP.NET Core/.NET. * Strong understanding of relational databases ... Bachelor's in Computer Science, Software Engineering, MIS, or equivalent experience. Pay Rate and ...

CarShield

AI Specialist

Saint Peters, MO · On-site

Hands-on experience with C# and ASP.NET Core/.NET. * Strong understanding of relational databases ... Bachelor's in Computer Science, Software Engineering, MIS, or equivalent experience. Pay Rate and ...

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Freelance Asp Net Core Developer information

What is the difference between Freelance Asp Net Core Developer vs Freelance Front End Developer?

AspectFreelance Asp Net Core DeveloperFreelance Front End Developer
Required SkillsProficiency in C#, .NET Core, APIs, backend developmentProficiency in HTML, CSS, JavaScript, frameworks like React or Angular
Work EnvironmentBackend server-side projects, API development, enterprise applicationsClient-side interfaces, website and app UI design
Common Industry UsageSoftware companies, enterprise solutions, backend servicesWeb design agencies, startups, digital marketing firms

Freelance Asp Net Core Developers focus on backend development using C# and .NET Core, building APIs and server-side applications. In contrast, Freelance Front End Developers specialize in creating user interfaces with HTML, CSS, and JavaScript. Both roles are in high demand but serve different parts of the software development process.

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Freelance Asp Net Core Developer jobs near you
Infographic showing various Freelance Asp Net Core Developer job openings in Missouri as of June 2026, with employment types broken down into 4% As Needed, 35% Full Time, 37% Part Time, 3% Temporary, 9% Contract, and 12% Nights. Highlights an 93% Physical, 3% Hybrid, and 4% Remote job distribution.

Full-Stack - AI Specialist

Saint Peters, MO • On-site

The Timberline Group
See more jobs at The Timberline Groupexternal

$95 - $140/hr

Other

Medical, Dental, Vision, Life, Retirement

Posted 2 days ago

New

Job description

US Citizens or GC Holders only
Must be on W2 - no C2C
Direct - Hire - Local Applicants onlyUS Citizens or GC Holders only
Must be on W2 - no C2C
Direct - Hire - Local Applicants only

Seeking an experienced Full-Stack Developer to join its growing AI team. In this role, you'll help support, improve, and build the internal applications used every day by our claims, QA, and sales teams. Our current portfolio includes applications for paid-claims review, multi-vendor parts sourcing, outbound lead management, and representative training, built with Angular front ends andASP.NET Core (.NET 10) APIs.
This role combines new development with ownership of applications already in production. You'll troubleshoot issues reported by users, improve performance and reliability, keep the technology stack current, build new features end to end, and maintain integrations with critical business systems. You'll also work with AI-enabled functionality, including applications that use LLMs and AI agents to review claims and score risk.

  • Support and improve production applications, resolving user-reported issues, performance bottlenecks, and edge cases
  • Build new features end to end using Angular, TypeScript, C#, andASP.NET Core
  • Maintain and modernize applications through Angular upgrades, dependency updates, vulnerability patching, and database migrations
  • Diagnose and optimize slow queries and application performance
  • Maintain integrations with SQL Server, Microsoft Fabric, Salesforce, and third-party vendor APIs
  • Support and monitor LLM and AI-agent functionality embedded within production applications
  • Containerize and deploy applications using Docker and GitHub Actions
  • Support application authentication and access using Active Directory and LDAPS
  • Work within existing codebases, understand established design decisions, and make thoughtful, maintainable changes
  • Collaborate in a fast-moving environment where solutions are shipped, measured, and iterated based on real-world results
Requirements
  • Strong full-stack software development experience in a production environment.
  • Hands-on experience with C# andASP.NET Core/.NET.
  • Strong understanding of relational databases and SQL; SQL Server experience preferred.
  • Experience supporting and maintaining applications after production launch.
  • Ability to troubleshoot production issues, analyze existing code, and implement durable fixes.
  • Comfortable working from evolving requirements and independently driving features from development through deployment.
  • Experience with REST APIs and third-party system integrations.
  • Familiarity with Docker, CI/CD pipelines, and GitHub Actions preferred.
  • Experience with Active Directory, LDAP/LDAPS, or enterprise authentication preferred.
  • Experience with Microsoft Fabric and/or Salesforce integrations preferred.
  • Interest in building AI-enabled applications and working with LLMs or AI agents.
  • Must be able to work on-site in St. Peters, MO 5 days/week.
  • Bachelor's in Computer Science, Software Engineering, MIS, or equivalent experience.
Pay Rate and Benefits
  • Salary commensurate with experience
  • Group Insurance (Medical, Dental, Vision, Life, etc.).
  • 401k with Employer Match.
  • Discounted Tuition at Lindenwood University.
  • Professional development opportunities.
  • Basketball, and other recreation available on-site.
  • Fitness facilities, with the option to take classes led by on-staff personal trainer (at St. Peters headquarters).
  • And more!

"Delivering quality solutions through quality people"
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