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Hire the best C# Developers & Programmers in Seattle, WA

Check out C# Developers & Programmers in Seattle, WA with the skills you need for your next job.
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  • $25 hourly
    • 5.0/5
    • (21 jobs)
    I am a game developer based in Seattle, WA, in the United States. I taught myself JavaScript/HTML in order to make games. I have since branched out and learned C++ while working on a VR game in Unreal Engine and C# while working in Unity on various projects. You can check some games I've made, as well as some other projects I've worked on on my website: gallegosaudio.com The website itself is built entirely from the ground up by me. Languages I know: - HTML/CSS - Javascript/TypeScript - C++ - C# Related Skills: - Unreal Engine 4 - Unity - Photon Networking - FMOD - Wwise
    Featured Skill C#
    HTML5 Canvas
    Unity
    Game Development
    Photon Unity Networking
    Unreal Engine
    JavaScript
    HTML
    C++
  • $80 hourly
    • 5.0/5
    • (55 jobs)
    I write code that smells like Lilac and reads like Byron. I have a compulsive love for elegant architecture, Stockholm syndrome for clear documentation, and a solid background in clean code. I’ve taken multiple projects from ideation to production, discovered new mathematical transforms, led teams of developers, wrangeled interns, and presented to executives. I’ve tested my mettle contending with stormy seas in small watercraft, particularly puckering precipices on skis, and freezing desert nights without so much as a tent to shelter under. I’ve gone ice breaking in a canoe, sent the fingers on ski blades, been skinny dipping in frigid alpine lakes, driven in LA, and have stories enough to last long into the night. All this to say, your biggest, grimiest, oldest ball of mud doesn’t scare me in the slightest. When things go awry in the worst of ways, I get loud and I lead. I combine the knowledge of a software engineer with the swarthy gumption of an adventurer, and the hard won experience of both. Let me build you something beautiful!
    Featured Skill C#
    Data Extraction
    Data Mining
    Web Crawling
    Blender
    Data Scraping
    C++
    Java
    SQL
    Python
    Microservice
    Distributed Computing
    Software Architecture & Design
    Serverless Computing
  • $40 hourly
    • 5.0/5
    • (41 jobs)
    Results-driven tech professional with 7 years of experience spanning web development, QA, automation and project management. Skilled in leading cross-functional teams, translating client requirements into actionable tasks, and optimizing project workflows for maximum value. I am a Top Rated Plus freelancer (top 3% of all Upwork talents) with a 100% job success rate and over 5400 hours of billable hours done through Upwork. I have 7 years of experience in the tech industry, with 5 of them being dedicated QA/Automation. I have been a back-end dev, web dev and most recently a QA Automation Engineer. I enjoy humor in the work place. I am easy to work with. I bring professionalism, good communication and most importantly, value to your project.
    Featured Skill C#
    HTML
    Microsoft SQL Server
    Webflow
    Game Design
    MySQL
    Mobile QA
    Automation
    SQL
    RESTful API
    Figma
    Software QA
    API
    Web Design
    JavaScript
    Jira
    Front-End Development
  • $32 hourly
    • 5.0/5
    • (1 job)
    I am a software engineer at a big tech company. I have a strong understanding of the latest programming languages and technologies, and I am excellent in problem solving. I can help you with automation of tasks, or working on whatever project you have. - I am proficient in writing code in Java, Python, C, Scala, C#, SQL - I have experience with AWS, Docker, Jenkins, Git, Github & GitHub Actions, Spring Boot If you are interested in my services, please do not hesitate to contact me. I would be happy to discuss your specific needs and how I can help you.
    Featured Skill C#
    Data Structures
    Java
    C
    Python
  • $45 hourly
    • 5.0/5
    • (4 jobs)
    Skills * End-to-end development of Web and service-backed applications, taking projects from start to finish and front to back, using both industry standards and Microsoft platforms * UI development on Web and Windows (WPF/WinUI); have taken product UI from conception to shipping including polished UI for high-profile end-user features in MS Office; strong interest in design and enjoy working with product team to learn from customers. • Windows systems programming using C++ and Rust. Co-developed the first Rust language projection for WinRT from 2016 prior to Microsoft’s first-party support. * Modern web development with modern HTML5/CSS3/JavaScript practices and technologies for complex browser-based applications, including TypeScript and ES5/6 features, DOM manipulation both with and without jQuery, and libraries/frameworks including Blazor, React, Angular and d3/c3 * C# language expertise (some work with Rust, F#, Powershell, native C++); extensive knowledge of .NET (up to .NET 8) and Windows platforms. Includes functional/LINQ, async and concurrency-related features and patterns, Roslyn analyzers and source generators.
    Featured Skill C#
    React
    Microsoft Windows PowerShell
    Microsoft Excel
    .NET Core
    Web API
    XAML
    TypeScript
    Haskell
    Rust
    Windows App Development
    Linux
    C++
    JavaScript
    F#
  • $45 hourly
    • 4.6/5
    • (14 jobs)
    For more than ten years, I have been developing websites and desktop apps. Strong knowledge of Linux and Windows platforms. I possess more than ten years of experience as a full-stack web developer using HTML, CSS, Jquery, Bootstrap, Python(Django, Flask), .NET MVC, Php, among others. - Python(Flask, Django, Pyramid, AIOHttp) - .Net (C#, ASP, ASP .net, MVC .net) - Docker, Compose, AWS - SQL (Postgres, MySQL, Microsoft SQL) - NoSQL (MongoDB, Dynamo, Elastic) - Frontend (JS and TS) jquery, angular, react - Linux and Windows admin.
    Featured Skill C#
    DevOps
    AWS Lambda
    RESTful API
    Amazon DynamoDB
    jQuery
    Flask
    Python
    AngularJS
    Django
    ASP.NET MVC
    SQL
  • $100 hourly
    • 0.0/5
    • (0 jobs)
    - Former front office quant & options day trader - Master's degree in financial mathematics with GPA 4.0/4.0 - Python, C#, SQL, MATLAB, R - Fluent in English and Swedish
    Featured Skill C#
    Machine Learning
    Python
    SQL
    Cryptocurrency
    Derivatives Trading
    API
    Algorithms
    MATLAB
  • $35 hourly
    • 4.5/5
    • (4 jobs)
    I'm a strong JavaScript/TypeScript/Python developer. I have extensive experience building a solid backend+setting up a database, and I'm just as comfortable creating a modern, responsive website. I worked for Microsoft for 5 years, and as a Senior Engineer+tech lead for the fintech company Lively HSA. I also love writing utility scripts and making internal desktop apps, especially converting data files from one format to another. I can contribute to your project and help bring your ideas to life!
    Featured Skill C#
    Audio Editing
    Video Editing
    Database Design
    C++
    Linux
    Node.js
    React
    HTML5
    Google Cloud Platform
    JavaScript
    CSS 3
    Java
    Python
    Amazon Web Services
  • $40 hourly
    • 0.0/5
    • (1 job)
    3D artist with specialty in creating procedural materials/textures. I also have experience in creating prototype VR applications.
    Featured Skill C#
    Blender
    Autodesk 3ds Max
    Meta Quest
    Mixed Reality
    Augmented Reality
    Virtual Reality
    Python
    Unreal Engine
    Unity
    Adobe Substance 3D
    Autodesk Maya
    Texture Mapping
    3D Art
  • $70 hourly
    • 0.0/5
    • (0 jobs)
    Experienced program manager and developer in the field of Virtual and Augmented Reality. My skills encompass: * Unreal Engine, Unity, 8th Wall * Blueprint * C++, C# * Python * babylon.js * three.js * a-frame * ar.js * Unity Frameworks, Unity Ads, ARCore, ARKit, and Oculus SDK Platforms I and my team work with: *Windows *Android *iOS Management tools we use: * Trello * Youtrack * Bitrix24 * Asana * Jira * Slack Based on the extensive work experience I will build great value for our customers, don't hesitate to reach out!
    Featured Skill C#
    Mobile Game
    Virtual Reality
    Augmented Reality
    UV Mapping
    Substance Painter
    Blender
    Node.js
    PHP
    MySQL
    Unreal Engine
    Java
    Python
    C++
    Unity
  • $100 hourly
    • 0.0/5
    • (0 jobs)
    I am a seasoned software engineering leader and developer with a passion for building high-performing teams and delivering impactful solutions. Over my career at Amazon, SEEK, Liberty Financial, and beyond, I’ve led efforts in API development, workflow automation, fraud detection, and search optimization. I enjoy working hands-on with technology, introducing functional programming languages like F# and Scala into enterprise environments, and mentoring engineers to grow their skills. More recently I've used TypeScript/NodeJS to integrate with AI clients. I thrive in roles that blend technical innovation with leadership, driving process improvements and ensuring teams deliver high-quality software efficiently.
    Featured Skill C#
    People Management
    SQL
    Agile Software Development
    Functional Programming
    F#
    Amazon S3
    Amazon DynamoDB
    AWS Lambda
    Node.js
    TypeScript
    Scala
  • $80 hourly
    • 0.0/5
    • (0 jobs)
    Hi, I’m Jacopo Mangiavacchi — a senior technologist with over 20 years of experience building cutting-edge software products across AI/ML, mobile (iOS & Android), web platforms, and cloud-native systems. I've held leadership and engineering roles at Microsoft (Principal Data Scientist), IBM (Senior Cloud Architect for Mobile & AI), and multiple startups, where I helped design, build, and scale production-grade apps and intelligent systems from the ground up. I'm also a Google Developer Expert (GDE) in Machine Learning, an award-winning hackathon champion (Microsoft Global Hackathon), and a published technical author with contributions to the open-source and AI communities. 💼 What I Specialize In ✅ Mobile Development (iOS & Android) -Native development using Swift/SwiftUI and Kotlin/Jetpack Compose -Cross-platform apps with React Native, Flutter, and TensorFlow Lite -Deep integration of on-device ML and real-time inference ✅ AI/ML Systems & Data Science -End-to-end ML pipelines: data ingestion → model training → deployment -Computer Vision, NLP, Generative AI, Time Series Forecasting -Building custom models or using pre-trained ones (Core ML, TensorFlow, OpenAI) -ML explainability, ethical AI, and on-device inference optimization ✅ Cloud & Backend Engineering -Scalable API and microservice architectures using Node.js, Python, and Go -Cloud deployments on GCP, Azure, AWS, and IBM Cloud -Serverless solutions, edge computing, CI/CD, containerization (Docker, Kubernetes) ✅ Product & Innovation -Rapid prototyping and MVP development -UX-driven design thinking applied to AI/ML features -Smart apps that interface with wearables, AR, and spatial computing 🏆 Career Highlights 🧠 GDE in Machine Learning – Recognized for technical excellence and community contribution 🏆 Microsoft Hackathon Global Winner – AI-powered accessibility solution 📱 Apps featured by Apple & Google Play – With 100K+ users 📚 Published Author – Books on Swift for TensorFlow, Keras, and Core ML 📊 Patented Inventor – In content protection, streaming, and ML systems 🏗️ Startup Tech Advisor – Helped launch and scale 10+ startups 🤝 Why Clients Work With Me I bridge the gap between deep technical expertise and real product value. I’m hands-on, communicative, and comfortable working solo or leading teams through full-lifecycle development — from zero to launch and beyond. Let’s turn your idea into a high-impact, scalable product — powered by AI and built with care.
    Featured Skill C#
    Serverless Stack
    Spatial Analysis
    Natural Language Processing
    IBM Watson
    Microsoft Azure
    React Native
    React
    Node.js
    Python
    Kotlin
    Swift
    Data Analysis
    Core ML
    Artificial Intelligence
  • $80 hourly
    • 0.0/5
    • (0 jobs)
    Full Stack Developer with expertise in building scalable web applications using React, Angular, C#, and .NET. Passionate about integrating AI/ML solutions to drive intelligent, data-driven user experiences.
    Featured Skill C#
    F#
    VB.NET
    .NET Stack
    Angular
    React
    Blockchain Architecture
    Artificial Intelligence
  • $75 hourly
    • 0.0/5
    • (0 jobs)
    I’m a software engineer with experience in AWS web services, data processing, and aerospace flight software. My diverse set of skills will allow you to build web applications, create data pipelines, or even design real time robotics software. No matter the project, I deliver robust and maintainable software in a speedy timeframe.
    Featured Skill C#
    SystemVerilog
    SQL
    Linux
    Qt Creator
    R
    Amazon Web Services
    C
    Ruby
    JavaScript
    TypeScript
    Scala
    Java
    Python
    C++
  • $100 hourly
    • 0.0/5
    • (0 jobs)
    Experienced Software Engineer with a history of strong collaboration and delivering quality software. Skilled in Node.JS, Python, Golang and cloud architectures.
    Featured Skill C#
    Amazon DynamoDB
    Elasticsearch
    Amazon Redshift
    CI/CD
    Microservice
    Kubernetes
    Docker
    REST API
    Apache Kafka
    Node.js
    TypeScript
    MongoDB
    Golang
    Python
  • $60 hourly
    • 5.0/5
    • (18 jobs)
    If you’re looking for a developer who’s just going to drop another generic chatbot onto your website and call it a day, that’s not me. My sweet spot is building digital experiences that work—and, frankly, make your competition jealous. Over 13 years, I’ve helped brands like Microsoft, Siemens, and Orange serve up over a million automated customer interactions—blending full stack muscle (React, Node.js, .NET, AWS, Azure, you name it) with chatbots that actually do something, not just answer “What’s your return policy?” Let’s make your chatbot the MVP, not just the intern: Imagine a bot that handles support, closes sales, and knows when to tap your human team on the shoulder for a hot lead. (Did this for a SaaS, demo bookings shot up. Their sales team still sends me holiday cards.) Want a chatbot that fits your brand—not a pixel out of place, not a single “May I help you?” in robotic monotone? That’s my jam. Your brand gets a digital wingman, not a robot in disguise. Tired of onboarding headaches? Let’s create a conversational flow that walks users through every step, cuts support tickets, and makes you look super organized. Why these solutions? Because every minute your users waste is money left on the table. And trust me, nobody comes back for “average.” A chatbot that’s smart, seamless, and on-brand turns browsers into buyers—and customers into loyal fans. Here’s my style: I don’t just build. I listen. Send me your site or outline your user journey, and I’ll cook up tailored solutions—no recycled advice. I architected for Microsoft, designed for Siemens, and even made Orange’s users smile (and that’s saying something). I’ll help your business scale, your support team breathe easier, and your bottom line grow. Ready for a web and chatbot experience that’s actually memorable? Let’s talk—and let’s make your brand the one everyone’s chatting about.
    Featured Skill C#
    .NET Framework
    React
    Haskell
    Blockchain
    .NET Core
    TypeScript
  • $35 hourly
    • 0.0/5
    • (0 jobs)
    Summary AI/ML, Full Stack Developer with 20+ years of expertise in research, software development, and technical leadership. Delivered solutions for prominent clients (Microsoft, Google, Washington Mutual Bank, Golf Savings Bank, T-Mobile). Proven track record of leading technical discussions, selecting technologies, and driving business objectives. Software Development Microsoft Corporation (5 contracts) Washington Mutual Bank (Change Request Approval System) Golf Savings Bank (Mortgage Origination Application) Google (Motorola) (Video player SDK, API development) Clark County Government, Las Vegas, NV (Police and FBI Wanted Vehicle System) T-Mobile (Business Process Automation) Technologies Windows App Development C#, C, C++, Windows Forms, Windows Presentation Foundation (WPF), Universal Windows Platform (UWP), .NET Framework, .NET Core, XAML, Xamarin.Forms Web App Development HTML5, CSS3, JavaScript, TypeScript, Angular, React, Vue.js, Node.js, Express.js, Ruby on Rails, ColdFusion, .NET Core, ASP.NET MVC AI-Powered Sales & Automation AI & LLMs: OpenAI GPT-4, Claude, Mistral, Gemini API AI Voice & Speech: ElevenLabs Workflow Automation: N8N Sales & Outreach: SalesGPT, LinkedIn, Apollo.io Telephony & Communication: Twilio CRM & Lead Management: HubSpot, Salesforce Web Development JavaScript, Python 3.12, PHP, .NET Core, React, AngularJS, jQuery, RESTful API, GraphQL, WebSockets, Single-Page Application, HTML5, CSS3, TypeScript, Ember.js, Backbone.js Mobile App Development Java, Android Studio, Xamarin.Forms, .NET MAUI Data Science, AI & Automation Python, Big Data, Machine Learning, Data Science, OpenAI, AI-powered app development LLMs, Deep Learning (TensorFlow, PyTorch), Neural Networks, Chatbots, Azure AI Studio, Azure OpenAI, Cloud Data Architecture, Custom LLMs AI Technologies: Pinecone, Redis, Auth0, Streamlit, FastAPI, AgentGPT Model Evaluation Tools: Hugging Face Evaluate, Eval4NLP Databases SQL, Microsoft SQL Server, MySQL, SQLite, Azure SQL Database Cloud Computing Microsoft Azure (Azure DevOps, Azure Entra, Azure SQL Database, Azure OpenAI, Azure Pipelines) Amazon Web Services (AWS) Google Cloud DevOps & Infrastructure GitHub Enterprise, Azure DevOps, Microsoft TFS, CI/CD Pipelines IIS Server on VMs, Active Directory, ADFS Operating Systems Windows, Linux Research and Innovation Ongoing research in latest Microsoft, Google, and emerging technologies, including AI-powered app development: AI/ML frameworks: LLaMA, LangChain, Transformers, PyTorch, TensorFlow Programming languages: Python, Java, JavaScript, C++, R NLP Libraries: NLTK, spaCy, Stanford CoreNLP Cloud Platforms: Azure, AWS, Google Cloud, Meta AI Integration Tools: N8N, Make, Zapier Conversational AI: Bard, ChatGPT
    Featured Skill C#
    Facebook JavaScript
    Blazor
    Windows Forms
    Web API
    Web Form
    Microsoft Visual C++
    Transact-SQL
    ASP.NET MVC
    AngularJS
    jQuery
    SQL
    HTML5
    JavaScript
    ASP.NET
  • $35 hourly
    • 5.0/5
    • (3 jobs)
    An experienced and passionate writer with 7 years of experience. Expertise in developing guides, documentation, and executing processes for several teams. Spearheaded style guide and implemented it in six weeks. Adept at understanding audiences and collaborating to write technical documentation that is understandable by non-technical readers.
    Featured Skill C#
    Project Management
    Video Game Writing
    Scrum
    C++
    JavaScript
    Technical Writing
    Blog Writing
    AP Style Writing
    Website Content
    Copy Editing
    Creative Writing
  • $60 hourly
    • 4.4/5
    • (5 jobs)
    Hey I'm Cooper. I'm a software engineer with hands-on experience building applications from early-stage startups to Fortune 500 enterprises. My portfolio spans across building startups from the ground up, working on high throughput F500 APIs, and even building technical content online. My background includes experience in TypeScript, Svelte, Next.js, Supabase, Python, C++, C#, and Elixir. I pride myself with the ability to pick up new languages / systems quickly, while also maintaining great depth to the languages I work with consistently. Outside of consulting work, I have built my personal YouTube channel called Cooper Codes. On Cooper Codes I build technical videos for professional developers (13,00 subscribers, 200,000 views). I have worked with large brands such as Supabase, Couchbase, and The Net Ninja. I have an entrepreneurial spirit, which is perfect for anyone who needs high quality code built around their idea or enterprise team. I founded DeskSpacing.com, which has been used by over 1,000,000 unique visitors and has received 3,600,000 page requests over it's lifetime. I am willing to tackle any technical challenge and be your go to developer for creating your dream project. Alongside an in depth technical skillset I also have great communication, and will be with you every step of the way when it comes to your project. Not sure if I'm a fit? Feel free to send me a message and we can get working on what your needs are. I look forward to working with you.
    Featured Skill C#
    Enterprise Software Development
    Software Development
    Svelte
    MongoDB
    jQuery
    Node.js
    Python
    GraphQL
    Next.js
    PostgreSQL
    Supabase
    TypeScript
    JavaScript
  • $15 hourly
    • 0.0/5
    • (0 jobs)
    I’m the CTO of CodeIntegrity.ai, a venture-backed company supported by Boost VC, Antler VC, and NEC VC in San Francisco. We specialize in helping companies build production-grade agentic systems with robust security guardrails built in. My linkedin is linkedin.com/in/abilash-raghuram/
    Featured Skill C#
    MLOps
    Apache Spark
    Azure Cosmos DB
    RESTful API
    .NET Framework
    GraphQL
    JSON
    RESTful Architecture
    Microsoft Azure
    Java
    Python
  • $60 hourly
    • 0.0/5
    • (0 jobs)
    I’m a developer experienced in building and managing websites, desktop applications, and databases for small and medium-sized businesses. I'm currently expanding my knowledge base with new technologies, such as Arduino development, retro-game development and mobile app development. I have a large skillset and I'm quick to learn. I will work diligently to help you meet your technology needs.
    Featured Skill C#
    HTML
    CSS
    Visual Basic for Applications
    ASP.NET
    JSON
    SOAP
    MVC Framework
    JavaScript
    PHP
    Python
    VB.NET
    C
    MySQL
    Microsoft SQL Server
  • $60 hourly
    • 0.0/5
    • (0 jobs)
    PERSONAL PROJECTS Smart Shoplifter Detection System | Python, FastAPI, YOLOv8, OpenCV, PostgreSQL, Docker GitHub * Built real-time computer vision surveillance system processing 30 FPS video (~33ms/frame) using Haar cascades, HOG detection, and scikit-learn ensemble models (Random Forest + Decision Tree) for behavior analysis and confidence-based scoring. * Developed surveillance dashboard with live video streaming, people counting, and alert management using FastAPI backend with automatic OpenAPI documentation and dark theme UI optimized for 4GB+ RAM systems. * Engineered detection algorithms with 20% IoU threshold overlap detection and 50% containment checking to prevent duplicate counting, using aspect ratio filtering and contrast analysis validation to reduce false positives while maintaining 640x480 resolution at 85% JPEG compression quality.
    Featured Skill C#
    Software Development
    Database Management
    Python
    Node.js
    React
    JavaScript
    TypeScript
    Scripting
    Web Application
  • $15 hourly
    • 0.0/5
    • (0 jobs)
    I’m a developer experienced in building websites for small and medium-sized businesses. Whether you’re trying to win work, list your services, or create a new online store, I can help. Knows HTML and CSS3, PHP, jQuery, Wordpress, and SEO
    Featured Skill C#
    CSS
    HTML
    SQL
    Unit Testing
    AWS Development
    Microsoft Power BI
    Microsoft Azure
    Continuous Delivery
    Continuous Integration
    Artificial Intelligence
    Python
    Machine Learning Model
    ETL Pipeline
    Data Analysis
  • $30 hourly
    • 0.0/5
    • (0 jobs)
    I’m a backend-focused software engineer with 9+ years of experience in Java and C#. I specialize in designing and implementing scalable backend systems, RESTful APIs, database design, and enterprise application logic. My services include: ✔ API development and integration (Java Spring Boot / ASP.NET Core) ✔ Backend system architecture and database modeling ✔ Server-side logic, performance tuning, and refactoring ✔ Cloud service development (Azure / AWS) If you're looking for clean code, timely delivery, and long-term cooperation, I’d love to help.
    Featured Skill C#
    Software Design
    Software Architecture
    Web Server
    Spring Boot
    Spring Framework
    .NET Core
    Python
    AWS Development
    Microsoft Azure
    Microsoft Azure SQL Database
    Azure Cosmos DB
    Java
    Script
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