C# Developer Jobs in Illinois

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C++/C# Developer Application Integration Support

The Dignify Solutions, LLC

•

Remote or Columbia, Maryland, USA

Contract, Third Party

Job Responsibilities: Develop, maintain, and enhance application code using C++ and C# to support ongoing integration, maintenance, and enhancement needs across multiple transit system initiatives. Perform code analysis, debugging, and resolution of software defects reported from field operations or testing environments. Participate in peer code reviews, design reviews, and software quality assurance processes to maintain high development standards. Develop unit tests and integration tests to va
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Posted 12 hours ago | Updated 8 hours ago

C# and React Developer

Conch Technologies

•

Chicago, Illinois, USA

Contract

Hi Title : C# / React JS/ Postgres SQL (C# and React Developer) Location : Chicago, IL (5 Day's Onsite) Duration : 12 Months Contract Experience: 8+ Years C# / React JS/ Postgresql C# and React Developer We are looking for a talented and motivated C# and React Developer to join our development team. The ideal candidate will have experience building scalable web applications using C# (.NET) on the backend and React.js on the frontend. You will work closely with cross-functional teams includi
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Posted 14 hours ago | Updated 13 hours ago

C#.Net Developer (W-2 only)

Kellton

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Remote

Contract

This is a fast moving position with a great Top 100 client. They will interview within a couple of days This role is completely remote and is W-2 only No c2c for this role please . 10+ years technical engineering experience with coding in languages including, C#, JavaScript, .NET or Python.4+ years track record of delivering high quality software components in .NET, Angular, React, C# and micro-front-end architecture.3+ year experience with Azure stack and AKS.Ability to analyze and solve hard
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Posted 19 hours ago | Updated 16 hours ago

Senior C# Full Stack Developer

Precision System Design Inc.

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Remote

Contract

Our Fortune 100 direct client is hiring for experienced Senior Full Stack Developers to work on large-scale IT projects. You would be designing and coding in a variety of technologies supporting and developing an Vue/Angular UI application, with C# back-end microservices. The ideal candidate will have strong C# development experience, has worked with front-end technologies such as angular, and back-end experience with SQL Server. This role can be done fully remotely following an EST work schedul
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Posted 7 days ago | Updated 2 hours ago

C# Dot Net Developer with Trading exp

Magnum Technologies, Inc.

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Remote

Full-time

Job Title: Senior .NET Developer with Investment Banking Systems Experience: 7+ years Location: NYC(Remote) C2H/ W2 only Overview: We are seeking a Senior .NET Developer consultant with strong expertise in Investment Banking Systems for a Contract-to-Hire (C2H) position. The ideal candidate must have hands-on experience in Stock Loan business functions and familiarity with systems like Global One, Loanet, and EquiLend interfaces. Strong technical proficiency is required in C#/.NET (WPF, WCF), Ka
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Posted 1 day ago | Updated 21 hours ago

C# Developer

Kforce Technology Staffing

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Remote or Boca Raton, Florida, USA

Contract

RESPONSIBILITIES: Kforce has a client that is seeking a C# Developer in Boca Raton, FL. Key Responsibilities: * Architect, develop, and maintain a modern full-stack multi-tenant SaaS platform using .NET 9, C#, and Azure * Apply Domain-Driven Design () and clean architecture principles to support scalability, maintainability, and long-term growth * Build intuitive and responsive front ends using Telerik UI for ASP.NET Core, Bootstrap, Razor Pages, HTML, jQuery, and JavaScript * Design and implem
Posted 7 days ago | Updated 7 hours ago

C# Developer

Headway Tek Inc

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US

Full-time, Part-time, Contract, Third Party

1.C# Dev -AKS & Azure Requirement: C#, Asp.Net Azure Kubernetes Services (AKS) or Kubernetes Azure Cosmos DB REST API/ Microservices MS Experience Knowledge of Al Other requirements: Communication: Good Onsite/Offshore Co- ordination Passionate about Learning Should be able to work in couple of overlap PST hours Should work in PST time zone
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Posted 18 days ago | Updated moments ago

Remote Position: Need C# & .Net developer with PeopleSoft / workday integration Exp

Svam International, Inc.

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Remote

Contract, Third Party

C# & .Net developer with PeopleSoft / workday integration Exp Long term contract Remote Position Job Description: Design, develop, and deploy scalable and resilient microservices using C# and the .NET framework. Proficiency in C# and the .NET framework (.NET Core, Core) are required skills.Ability to collaborate with cross-functional teams to define, design, and develop new features and services.Experience developing and maintaining robust, efficient, and secure RESTful APIs to facilitate seam
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Posted 6 days ago | Updated 20 hours ago

.NET Microservices Developer - (C#, .NET Core, ASP.NET, SQL Server)

Cloud and Things

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New York, USA

Third Party, Contract

Our goal is to solve problems and deliver results for our clients. At Cloud and Things, you can be a part of transforming the public sector's IT environment. Our team is on the forefront of helping to solve the government's most complex IT challenges. If you are seeking a role that offers the opportunity to work on rewarding projects, consider a career with Cloud and Things. *This is an exempt position. Salary commensurate with experience* Overview: We are seeking a .NET Microservices Developer
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Posted 5 days ago | Updated 15 hours ago

Software Developer (C#, .NET framework, .NET Core, JavaScript, and CSS)

Techgroup America Inc.

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Remote

Contract

Job Details Position: Software Developer Location: Remote Duration: 6-month contract Start Date: 7/21/2025 Description: The Software Developer Level 3 is responsible for leading a small agile development team within our Enterprise Services & Integrations systems. This role involves designing, developing, and implementing software solutions using C#, .NET framework, .NET Core, JavaScript, and CSS. The ideal candidate will have experience building RESTful APIs, web services for data transfer an
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Posted 5 days ago

MES Developer with .net and C#

Indotronix International Corp

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Remote

Contract

Role: MES Developer Location: Remote Pay Rate: $77/Hr on W2 Duration: 6+ Months Location: Remote, required to be within 1-2 hour commutable distance in one of the following client office locations: - Corning, NY - Charlotte, NC - Vineland, NJ - Phoenix, AZ - Hemlock, MI - Hickory, NC - Blacksburg, VA - Keller, TX - Boston, MAKey Responsibilities: Strategic view and understanding of Siemens Opcenter/Camstar Execution to lead design and development efforts across client. Design, implement,
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Posted 7 days ago

C#.NET API Developer

TriCom Technical Services

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Remote

Contract

C#.NET API Developer Summary This C#.NET API Developer will focus on developing financial applications, creating workflows, and API integration. Responsibilities Support the company's financial systems.Develop Web-based solutions for internal customers business needs using C#/MVC.NET and MS SQL.Develop methods and processes to interact with various Cloud-based APIs using SOAP and RESTful APIs.Develop and maintain data synchronization between various systems within and between the company and o
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Posted 14 days ago

*C# Developer with Strong SQL Development experience (Experience working in Hedge Fund background)*

Kellton

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Remote

Contract

Kellton Tech is a full-service software development company, offering end-to-end IT solutions, strategic technology consulting and product development services in Web, SMAC (Social, Mobile, Analytics, Cloud), ERP-BPM, and IoT space Our methodology of inventing infinite possibilities with technology helps us develop best in-class and cost effective solutions for our clients. Currently Kellton Tech is looking for talented resources for one of our listed client. Below are the position details: Po
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Posted 60+ days ago | Updated 1 day ago

C# Software Developer

Zachary Piper Solutions, LLC

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Remote

Full-time

Piper Companies is seeking a C# Software Developer to join a leading shipping and logistics organization. The C# Software Developer will work on backend development, automate workflows, and assist in designing cloud-based applications, with an emphasis on data. Responsibilities of the C# Software Developer include: Lead the design, development, testing, and deployment of .NET C# applications. Architect complex data structures for rate audits of parcel carrier invoice files. Design, develop, an
Posted 47 days ago | Updated 21 days ago

UI Developer (.Net C#, APIs) Remote

Gainwell Technologies LLC

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Remote or Milwaukee, Wisconsin, USA

Full-time

Be part of a team that unleashes the power of leading-edge technologies to help improve the health and well-being of those most vulnerable in our country and communities. Working at Gainwell carries its rewards. You'll have an incredible opportunity to grow your career in a company that values work flexibility, learning, and career development. You'll add to your technical credentials and certifications while enjoying a generous, flexible vacation policy and educational assistance. We also have
Posted 34 days ago | Updated 10 hours ago

C# .NET Developer

Sun Technologies,Inc.

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Remote

Contract

Job Title: C# .NET Developer Duration: up to 6 months contract (with the possibility of extension) Location: Remote Work Pay Range: $90.58 per hour on W2 Featured Benefits: Medical Insurance in compliance with the ACA401(k)Sick leave in compliance with applicable state, federal, and local laws Job Description: The successful candidate will be responsible for the development, configuration, management, and maintenance of these applications, ensuring seamless functionality and optimal performanc
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Posted 60+ days ago | Updated 12 days ago

Commodities Application Developer (C#, React, TypeScript) - AVP - Houston (Hybrid)

Citi

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Remote or Houston, Texas, USA

Full-time

The role is for a C# developer who will be working within a small team on Commodities Marking and Market Discovery Platform used by traders across the regions. We offer the opportunity to grow professionally, learn new technologies and gain business knowledge. Responsibilities: Develop the Platform using C# with an opportunity to learn React during WPF to React migrationWork directly with quants and traders to specify requirements and own deliveries and 3rd line support to provide daily communi
Posted 23 days ago | Updated 1 hour ago

Sr. Software Developer - C#/WPF for UI/UX Development

Esri

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Remote

Full-time

Overview This is a great opportunity to join a fast-paced agile team that works with the latest technologies and patterns, asynchronous programming, and MVVM to design and develop next-gen Esri software. We are focused on designing and developing solutions for working with raster and imagery in ArcGIS Pro. Our tools support complex real-life workflows in 2D & 3D for raster / image processing and analysis. If you are excited about user interaction and user interface development, then join our cr
Posted 60+ days ago | Updated 1 hour ago

Developer - .Net, C# Information Technology

United Airlines

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Chicago, Illinois, USA

Full-time

Description Find your future at United! We're reinventing what our industry looks like, and what an airline can be - from the planes we fly to the people who fly them. When you join us, you're joining a global team of 100,000+ connected by a shared passion with a wide spectrum of experience and skills to lead the way forward. Achieving our ambitions starts with supporting yours. Evolve your career and find your next opportunity. Get the care you need with industry-leading health plans and best-i
Posted 39 days ago | Updated 1 hour ago

Senior Developer - .Net, C# Information Technology

United Airlines

•

Chicago, Illinois, USA

Full-time

Description Find your future at United! We're reinventing what our industry looks like, and what an airline can be - from the planes we fly to the people who fly them. When you join us, you're joining a global team of 100,000+ connected by a shared passion with a wide spectrum of experience and skills to lead the way forward. Achieving our ambitions starts with supporting yours. Evolve your career and find your next opportunity. Get the care you need with industry-leading health plans and best-i
Posted 39 days ago | Updated 1 hour ago