Hire the Best C# Developers & Programmers

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Peter H.

Plymouth, United Kingdom

$60/hr
5.0
8 jobs

Hi, I’m Peter, a senior full-stack developer specializing in building SaaS platforms and mobile apps with AI integrations. I have developed SaaS platforms and mobile apps with millions of users and taking millions of dollars in weekly payments. My preferred technologies are Angular & React, Node, c#, Java, MongoDB and Postgres, but I have 20 years experience working with hundreds of different frameworks, libraries and APIs across a wide range of domains. I’ve worked extensively across AWS, GCP and Azure, including Cognito, ECS (Fargate), ECR, SSO, Multi-tenant CloudFront, Route53, Lambda, Step Functions, CDK and CloudFormation. I’ve led the delivery multi-tenant SaaS platforms, data-heavy systems, POS and booking systems, ecommerce platforms, eHealth applications, route optimisation tools, games and a lot more. My recent work has focused on leading the development of AI assisted data analysis agents, custom generative content AI tools, automated data gathering, curation and aggregation - integrated into web SAAS platforms and mobile apps. I enjoy working across the different teams to build great products, working with founders, marketing teams, customers, developers and designers. Please get in touch if you need a high quality senior full-stack developer that you can trust to do a great job of delivering your project.

  • Angular
  • Node.js
  • AngularJS
  • JavaScript
  • TypeScript
  • Ionic Framework
  • API
  • React
  • SCSS
  • HTML
  • MongoDB
  • SQL
  • AWS CloudFormation
  • AI Agent Development
  • AI Development
Swati R.

Dehradun, India

$15/hr
4.8
87 jobs

✔️ Worked with Start-up to well-established recruitment firms/agencies ✔️ Technology Savvy Recruiter ✔️ Degree Holder - Human Resource Development Management/ Finance/ Legal INDUSTRIES: BPO / Call Center, Retail, Freight/Logistics, Food, Hospitality, Consulting Firms, Real Estate, IT/Technology, Financial Technology, Biotech, Bio-Pharma, Life Sciences, Marketing and Ads, Computer Software, E-commerce, Engineering and Architecture, Accounting and Finance, Recruitment Agencies JOB CATEGORIES: Entry-level, middle, managerial, and C-level roles. Sales - Directors, VP, Account executives/managers, Inside/outside sales, Pre/post sales. IT – programmers, QA, DBA, system analysts, project managers, system managers, Project Managers, networking experts, Website Designers, Java Developers, Software Developers, QA Developers, Business Analyst, Human Resource, Finance, Marketing, Legal(Attorneys in USA), Sales Engineers, SDR etc. MARKET: India, USA, UK, APAC, Europe, Egypt, Canada and Philippines. ATS/Applicant Tracking System/Sourcing Platforms/Others: LinkedIn Recruiter, LinkedIn X-Ray Search, LinkedIn Recruiter Lite, LinkedIn Sales Navigator, Monster, Taleo, Greenhouse, Manatal, Lever, Hirebridge, Indeed, RingCentral, Skype, Zoom, Google Meet.

  • Recruiting
  • Customer Relationship Management
  • Candidate Evaluation
  • Candidate Recommendation
  • Candidate Management
  • Sourcing
  • Communications
  • Visual Basic for Applications
  • LinkedIn Recruiting
Anshul C.

Coppell, Texas

$34/hr
4.9
18 jobs

We help enterprises modernize, migrate, and future-proof IBM i (AS400), Mainframe, COBOL, and RPG environments while integrating them with cloud-native, API-first, and AI-enabled architectures. We are also ISO 42001 and ISO 27001 certified, ensuring strong AI governance and information security standards. Since 2013, we have delivered transformation programs for 100+ global clients, including Fortune 500 organizations—turning rigid legacy platforms into scalable, digital ecosystems. With deep expertise across IBM i, ERP, EDI, cloud, and enterprise application stacks, we bridge traditional systems with modern Java, .NET, cloud, microservices, AI, and real-time integration frameworks. Legacy Systems & IBM i / Mainframe Modernization Platforms: IBM i (AS400 / iSeries), IBM z, COBOL, RPG, SQLRPGLE, CLLE, Synon, NetCOBOL, Fujitsu COBOL, Delphi Operating Systems: OS/400 (V5R3–V7R5), IBM AIX Tools: Profound, LANSA, Synon, WebSphere, ARCAD, X‑Analysis, MIMIX, RDi, ACS Core Modernization Services AS400 / IBM i modernization & green‑screen transformation RPG to Java and .NET migration COBOL to NetCOBOL / Fujitsu COBOL conversion IBM i API enablement & microservices architecture DB2/400 migration to PostgreSQL, SQL Server, Cloud databases IBM i cloud migration (AWS & Azure hybrid models) Legacy application refactoring & performance optimization Full‑Stack Development (Java | .NET | PHP | Delphi) Java: Spring/Spring Boot, Hibernate, Struts, Microservices, REST/SOAP, Kafka, Camel .NET: .NET Core/5–7, ASP.NET Core, MVC, Web API, Blazor, WCF, SignalR, EF Core, WPF, WinForms PHP & Delphi: Laravel, Symfony, CodeIgniter, Yii, Zend | Delphi 7–11, RAD Studio, VCL, FireMonkey Frontend: React, Angular, Vue, Next, Bootstrap ERP, Integration & Streaming ERP: JobBOSS ERP (Manufacturing), JD Edwards (CNC, BSSV, Z‑Tables, UBE), Infor (XA, LX), PrismERP, S2K, CAMS/400, Dynamics AX Integration: MuleSoft (API‑led, DataWeave, RAML), Apache Kafka, REST/SOAP, cloud & hybrid integration EDI & B2B Integration X12, EDIFACT, VDA, TRADACOMS • Transactions 850–945 • VANs: OpenText, Liaison, GHX • FTP/SFTP/AS2 IBM Sterling, SPS Commerce, TrueCommerce • End‑to‑end EDI onboarding & automation AI, Cloud & DevOps AI: Code analysis, automated refactoring & tests, smart documentation, intelligent EDI validation Cloud & DevOps: AWS, Azure, GCP • CI/CD, Docker, Kubernetes, Jenkins, GitHub Actions Databases: DB2/400, PostgreSQL, MySQL, SQL Server, Oracle, MongoDB, Redis Why Choose Us? Proven IBM i / IBM z modernization expertise Kafka & MuleSoft real-time integration Deep EDI & ERP (Infor, JDE) capability Structured, outcome-driven transformation AI‑assisted acceleration for faster transformation Performance Assurance Dedicated 40+ hrs/week resource Direct Upwork communication Daily updates, weekly reports On-time, high-quality delivery Let's connect - If you are planning AS400 modernization, RPG conversion, COBOL migration, ERP integration, EDI automation, or AI-enabled transformation, we help you execute with precision and measurable outcomes. Keywords- IBM i Modernization | AS400 Modernization | RPG to Java Conversion | RPG to .NET Migration | Free Format RPG | Green Screen Modernization | IBM i Web Enablement | Legacy System Modernization | IBM i GUI Modernization | IBM i Cloud Migration | DB2 Migration | IBM i Consultant | Infor ERP Integration | JD Edwards EnterpriseOne | JDE API Integration | JDE Cloud Migration | ERP Integration | EDI 850 810 856 | WMS Integration | Cobol to Netcobol | Fujitsu Cobol | Delphi Modernization | Mainframe Migration | AI-Assisted Development | DevOps for IBM i | Enterprise Application Modernization | COBOL Migration | Mainframe Modernization | Job BOSS | IBM BOB | AI‑Assisted Modernization | ISO27001 | ISO42001

  • C#
  • Java
  • IBM AS/400 Control Language
  • COBOL
  • IBM RPG
  • IBM Db2
  • Windows Presentation Foundation
  • Mainframe
  • Migration
  • ASP.NET MVC
  • Electronic Data Interchange
  • Oracle JD Edwards EnterpriseOne
  • PHP
  • .NET Stack
  • Spring Boot
  • React
  • Infor F9
  • Delphi
  • JobBOSS Software
  • Angular
Paul G.

Sandhurst, United Kingdom

$75/hr
5.0
35 jobs

A software specialist with more than 30 years experience developing advanced systems from real-time 3D graphics and animation software, to mobile games and enterprise content management systems. Able to take control of the entire application development process from inception through planning to implementation and delivery. A honed focus on quality and reliability, with a view to ensuring long life and flexibility in all projects undertaken. I practice an engineering/architecture-first approach to software development, focusing on the general software design principles in designing a solution from a conceptual perspective, with no immediate reliance on any particular language or framework. This allows me to rapidly develop high-quality solutions that can be implemented in any suitable language, even languages I've previously not encountered, and ensure the product is of a high standard. Contrary to many software developers, I do not restrict myself by specializing in a particular language or framework, this allows me to think out of the box and be far more reactive to the specific demands of your project.

  • C#
  • Android App Development
  • C++
  • Firebase
  • Flutter
  • Unity
  • JavaScript
  • Python
  • Mobile Game
  • iOS Development
  • Game Development
  • Godot
  • Phaser
  • Software Architecture & Design
Shady M.

Basioun, Egypt

$25/hr
4.9
71 jobs

A skilled software developer, on various platforms ranging from Windows to Linux to ARM and other embedded devices (AVR, PIC, etc). My preferred programming languages include, but are not limited to: - C/C++ - Java - Python - Rust - C# - Matlab I'm familiar with various open source libraries in different programming languages such as STL, Curl, Json, GTK, Swing, BeautifulSoup, Requests, Selenium, Tkinter, and many more... I've experience in Embedded Software using various microcontrollers (AVR, PIC, STM32, TM4C123, etc...). I've used many peripherals such as (GPIO, Timer, PWM, NVIC, RCC, FPEC, UART, SPI, I2C, CAN, ADC,...), interfaced it with many sensors and actuators. I've built many projects ranging from simple projects (blinking LEDs, motor control, calculator, stop watch, ...) to more advanced projects (Bootloader, Smart Home, Digital Clock, ...). I have a strong background about Algorithms and Data Structures such as: - Dynamic Programming - Backtracking - Graphs - DFS - BFS - MST - Heap - Trie - Balanced BSTs - Segment Trees - Disjoint Set - and many more... I've solved +370 DSA problems on HackerRank platform and got ranked 660 over 23 million developers in solving coding challenges. You can find my profile in the portfolio. My primary focus in writing software is performance, without sacrificing the safety and security of the application. I will do my best to discuss all the relevant details and the scope of the project with the client, so that I can form an idea of the finished product in order to be able to lay a better groundwork design for the project.

  • AVR Microcontroller
  • C
  • Embedded System
  • Java
  • C++
  • STM32
  • Data Structures
  • Algorithms
  • Mathematics
  • Algorithm Development
  • Web Scraping
  • Tutoring
  • Bash Programming
  • Rust
Navee H.

Zirakpur, India

$20/hr
4.5
26 jobs

Hello, I would love to assist you with your QA Lead / Manual and Automation Testing project. I am a Top Rated QA Lead Engineer with 10+ years of experience in Software Testing, QA Strategy, Test Automation, and Quality Assurance Process Implementation for web, mobile, API, SaaS, and enterprise applications across Finance, Healthcare, E-commerce, LMS, CMS, Education, Loans, Fitness, and Social Media domains. As a QA Lead, I can help you build, manage, and improve the complete QA lifecycle while ensuring high-quality software delivery and faster release cycles. Core Expertise & Keywords: ✔ QA Lead / Senior QA Engineer ✔ Manual Testing & Automation Testing ✔ Selenium WebDriver / Cypress / Playwright ✔ API Testing (Postman, REST API, Swagger) ✔ Regression Testing / Functional Testing / Smoke Testing ✔ UI Testing / Cross Browser Testing / Mobile Testing ✔ Test Planning / Test Strategy / Test Case Design ✔ QA Process Setup & Improvement ✔ Agile / Scrum / SDLC / STLC ✔ Bug Tracking & Defect Management (JIRA, Azure DevOps) ✔ Automation Framework Development ✔ CI/CD Testing Integration ✔ Performance Testing & Database Testing ✔ User Acceptance Testing (UAT) ✔ Release Validation & Production Support ✔ Quality Assurance Consulting ✔ SaaS Application Testing ✔ Test Management & Team Collaboration I can help you: Set up QA activities and processes from scratch Build scalable testing workflows for your development team Improve software quality before production releases Reduce production bugs and release risks Create automation strategies to save testing time and cost Establish proper reporting, documentation, and test coverage Collaborate closely with developers, product owners, and stakeholders Why clients work with me: Strong leadership and ownership mindset Excellent communication and reporting Deep understanding of real-world QA challenges Fast issue identification and root cause analysis Focus on delivering stable, secure, and user-friendly software I am confident I can quickly understand your project requirements and contribute effectively as a QA Lead from day one. I would be happy to discuss your project and share relevant experience that matches your business goals. Looking forward to working with you. Best Regards, Navee H.

  • C#
  • Java
  • Manual Testing
  • Selenium WebDriver
  • Postman
  • Cucumber
  • Software Testing
  • Selenium
  • Automated Testing
  • Test Case Design
  • Mobile QA
  • Python Script
  • Scripts & Utilities
  • Data Scraping
  • CI/CD

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C# Developer Hiring FAQs

What is a C# developer?

C# developers write quality code for responsive desktop and web applications or back-end processes. C# is an adaptable, object-oriented programming (OOP) language based on the Common Language Infrastructure.

How do you hire a C# developer?

You can source C# developer talent on Upwork by following these three steps:

  • Write a project description. You’ll want to determine your scope of work and the skills and requirements you are looking for in a C# developer.
  • Post it on Upwork. Once you’ve written a project description, post it to Upwork. Simply follow the prompts to help you input the information you collected to scope out your project.
  • Shortlist and interview C# developer. Once the proposals start coming in, create a shortlist of the professionals you want to interview. 

Of these three steps, your project description is where you will determine your scope of work and the specific type of C# developer you need to complete your project.

How much does it cost to hire a C# developer?

Rates can vary due to many factors, including expertise and experience, location, and market conditions.

  • An experienced C# developer may command higher fees but also work faster, have more-specialized areas of expertise, and deliver higher-quality work.
  • A contractor who is still in the process of building a client base may price their C# developer services more competitively. 

Rates typically charged by C# developers on Upwork are:

  • Beginner: $25 per hour
  • Intermediate: $47 per hour
  • Advanced: $120 per hour

Which one is right for you will depend on the specifics of your project. 

How do you write a C# developer job post?

Your job post is your chance to describe your project scope, budget, and talent needs. Although you don’t need a full job description as you would when hiring an employee, aim to provide enough detail for a contractor to know if they’re the right fit for the project.

Job post title

Create a simple title that describes exactly what you’re looking for. The idea is to target the keywords that your ideal candidate is likely to type into a job search bar to find your project. Here are some sample C# developer job post titles:

  • C# developer needed for macroverse engineering support
  • Seeking C# developer for an educational game
  • Looking for a C# developer for a real estate app

Project description

An effective C# developer job post should include: 

  • Scope of work: From configuration to execution, list all the deliverables you’ll need. 
  • Project length: Your job post should indicate whether this is a smaller or larger project. 
  • Background: If you prefer experience with certain industries, software, or architectural patterns, mention this here. 
  • Budget: Set a budget and note your preference for hourly rates vs. fixed-price contracts.

C# developer job responsibilities

Here are some examples of C# developer job responsibilities:

  • Take an application storyboard from concept to reality
  • Outline, write, and maintain functional, responsive, and reliable C# code
  • Plan and build user interfaces and interactive media applications
  • Identify and fix bugs and bottlenecks

C# developer job requirements and qualifications

Be sure to include any requirements and qualifications you’re looking for in a C# developer. Here are some examples:

  • Experience working in various C# ecosystems and using OOP
  • Background in building RESTful web services with WCF/WebAPI
  • Familiar with an array of architectural and design practices
  • History of supporting business processes with clean C# code and database schemas