Hire the Best System Programmers
in the United Kingdom

More than 3,000 reviews on G2
Rating is 4.5 out of 5.
4.5/5
of Upwork by G2 peer reviewers
Phil R.

Ashford, United Kingdom

$55/hr
5.0
12 jobs

Experienced Automation, AI Workflow, and Database Systems Developer helping businesses replace manual processes with reliable, data-driven software. I design and build custom workflow platforms, internal business tools, automation scripts, API integrations, reporting dashboards, and AI-assisted systems using PHP, Python, JavaScript, MySQL, PostgreSQL, Docker, REST APIs, PowerShell, Bash, and cloud infrastructure. My background spans infrastructure automation, database design, DevOps, SaaS-style web applications, document workflows, approval systems, reporting, and system-to-system integration. I am particularly strong at taking messy operational processes — spreadsheets, emails, manual approvals, disconnected systems — and turning them into structured, auditable, automated platforms. Core skills include: * Workflow automation and process improvement * AI-assisted business systems and LLM integrations * PHP, Python, JavaScript, Node.js, and API development * MySQL and PostgreSQL database design, queries, reporting, and optimisation * Docker-based development and deployment * PowerShell, Bash, cron jobs, and scheduled automation * REST API integrations with third-party platforms * Approval workflows, document handling, audit trails, and dashboards * Cloud and infrastructure automation across AWS, GCP, VMware, and Linux environments * Git, Jira, Ansible, JSON, XML, and CI/CD-style deployment practices I combine strong technical depth with practical business understanding, helping clients build systems that save time, reduce errors, improve visibility, and scale beyond manual admin.

  • MySQL
  • HTML5
  • API
  • JavaScript
  • PHP
  • XML
  • Python
  • Scripting
  • CSS
  • British English Accent
  • HTML
  • Microsoft Windows PowerShell
EHTISHAM Z.

Newcastle upon Tyne, United Kingdom

$35/hr
4.9
80 jobs

**🚀 Elite .NET Developer | 8+ Years Building Scalable Solutions | Top-Rated with 100% Success Rate** **ASP.NET CORE | WEB API | C# | MICROSERVICES | DOCKER | BLAZOR | MAUI | SQL SERVER | AZURE | ANGULAR** Looking for someone who doesn’t just code, but thinks through problems and delivers solutions that actually work? You’ve found the right developer. 📊 Track Record That Speaks: 🏅 TOP-RATED PLUS 🏆 100% Job Success Rate ⭐ 5-Star Client Reviews 💰 $100k+ Platform Earnings 🔥 40+ Successful Projects ⚡ 4k+ Upwork Hours 🎯 Zero Failed Deliveries 🛠️ Core Tech Stack: Backend: .NET 9, ASP.NET Core 8, C#, Web API, Microservices Frontend: Blazor (Server/WASM), Angular 17, JavaScript/TypeScript, Html5, CSS3, Jquery Database: SQL Server, PostgreSQL, MongoDB, Azure Cosmos DB,Firebase Cloud: Azure, AWS, Docker, Kubernetes Payments: Stripe, PayPal, Square, Authorize.Net, Braintree APIs: REST, GraphQL, SOAP, OAuth 2.0, JWT Tools: Visual Studio 2022, Git, Azure DevOps, Jira 💡 What Sets Me Apart: I don’t just write code - I architect solutions. When you’re dealing with complex business requirements, you need someone who can translate abstract concepts into robust, scalable systems. Recent Wins: - Built secure payment processing system with Stripe (handling $50k+ monthly) - Migrated legacy .NET Framework app to .NET 8 (40% performance boost) - Integrated multi-vendor marketplace with PayPal, Stripe & bank transfers - Implemented real-time analytics dashboard with SignalR - Designed Azure-native solutions reducing infrastructure costs by 35% 🎯 Specialized In: ✅ Enterprise Web Applications ✅ Payment Gateway Integration (Stripe, PayPal, Square) ✅ Third-Party API Integration & Development ✅ REST/GraphQL API Development ✅ Cloud-Native Architecture ✅ Database Optimization & Design ✅ Legacy System Modernization ✅ Performance Tuning & Scaling 💳 Payment & Integration Expertise: -Payment Gateways:Stripe Connect, PayPal Express, Square APIs, Authorize.Net - Financial APIs: Plaid, Dwolla, banking integrations, cryptocurrency payments - Third-Party Services: Twilio, SendGrid, AWS SES, Google Maps, social logins - E-Commerce: Shopping cart integration, subscription billing, marketplace commissions - Security: PCI compliance, fraud detection, secure tokenization 🏭 Industry Experience: E-Commerce • FinTech • Healthcare • Real Estate • SaaS • Logistics • Marketplaces ⚡ My Process: 1. Deep Dive - I actually read your requirements (shocking, right?) 2. Smart Planning - Break complex problems into manageable pieces 3. Agile Delivery - Regular updates, no surprises 4. Quality Focus** - Clean code, proper testing, documentation 🌍 Availability: 📍 UTC+1 Timezone ⏰ 30-40 hrs/week 🗣️ Fluent English 📞 Flexible communication Why Choose Me? I’ve been where you are. Tight deadlines, complex requirements, budget constraints. I get it. That’s why I focus on delivering solutions that work reliably, scale properly, and don’t break the bank. Every project gets: - Detailed technical documentation - Clean, maintainable code - Comprehensive testing - Post-delivery support - NDA protection Ready to build something amazing? Let’s talk about your project. Ehtisham Zaki Senior .NET Architect & Full-Stack Developer ----- *Keywords: ASP.NET Core, C#, Blazor, Microservices, Azure, SQL Server, Web API, Angular, Docker, DevOps, Cloud Architecture, Enterprise Applications, Stripe Integration, PayPal API, Payment Processing, Third-Party APIs*

  • Azure Cosmos DB
  • MongoDB
  • Database Maintenance
  • ASP.NET Web API
  • Microsoft SQL Server Programming
  • Microsoft Azure
  • API Integration
  • jQuery
  • ASP.NET MVC
  • ASP.NET
  • Windows Forms
  • ASP.NET Core
  • Firebase Cloud Firestore
  • Stripe
  • In-App Subscription
Jason F.

London, United Kingdom

$90/hr
5.0
57 jobs

🔸 Top 1% in Upwork. 🔸 100% Job Success. 🔸 4,000+ hours. 🔸25+ years experience. I deliver high-quality, engineered software that is robust, works at scale, and can grow as fast as your business grows. ❝ High-quality software is not complicated - it just requires discipline and steadfast attention to detail on each step of the journey. ❞ What's stopping you from starting your journey to software excellence and fixing your business' pains? You can arrange a call with me to discuss your project needs for free in a 30-minute consultation call! Hi. I'm Jason - an experienced (25+ years) software architect and engineering professional involved in all parts of the SDLC (Waterfall, Agile and Hybrid methodologies). With a wealth of experience across industries such as commercial aviation, banking (real-time payments processing & FX), 24/7/365 manufacturing lines, e-commerce, and public transport (smart card), I will bring a passion for delivering elegant and reliable solutions to your project. I will work with you (and your team) to provide the best possible technical solution to your business problem. No matter the business domain or challenges you are facing, l have deep technical and architectural knowledge, as well as excellent communication skills, to help solve your business problem with the right software solution. I will bring to bear a highly focused set of technical and people skills to help your project succeed. The recommendations and advice I provide focus on minimizing risks and maximizing your project's chances of success. This is what my 25+ years of experience bring you: honest, robust, and intelligent solutions to see you succeed. When asked to build software, I deliver high-quality server-side C# .NET software solutions that give what you need: Software engineered to be robust, scalable, and designed to exceed your business expectations. What you'll get when you choose me to work with you: ⭐️ Clear, effective communication ⭐️ Precise, quality recommendations to ensure success for your project ⭐️ A focused, collaborative approach to work with you and your team ⭐️ A no-nonsense, results-focused approach that delivers value to your project For example, this are what a couple of my clients had to say: ❝Jason is by far the best architect I have ever worked with. He displays extreme ownership of his work and it's incredibly refined. Every deliverable was on time or ahead of time. Not only did Jason provide an incredibly performant and scalable architecture, the documentation he provided was top notch. I will forever keep Jason and my goto for any and all technical and solution architectural needs.❞ Cade - VP Engineering - US Software Company ❝Jason helped get our team on our feet for doing proper documentation and much more, actually. He helped improve the engagement of our team members and how they work together. If we can, we will surely ask for his help again in the future. I can only give high praise of Jason's quality of work. We highly recommended for documentation and general architectural design work.❞ Alexander L - Acting CTO - Global On Media If you are interested in working together, please invite me to your job on Upwork. I look forward to hearing from you soon and helping you deliver on your software vision. Regards, Jason. A highlight of my technical specialties I can help you with: ✅ .NET Technical and Solution architecture consultancy and design ✅ C#.NET ✅ Team leading, technical .NET mentoring, and coaching ✅ High availability solution designs (24/7/365) ✅ Event-driven architectures (including actor-based systems) ✅ Highly concurrent software design (thread-safe) ✅ High volume, low latency software designs ✅ Cloud (MS Azure and AWS) solutions ✅ Hybrid (on-premise and Cloud) solutions ✅ Microservices ✅ Message brokers and ESB ✅ SOLID, DDD, OOP, and TDD ✅ Experienced in Agile and Hybrid delivery models ✅ Container (Docker) deployments software using CI/CD (Azure Devops) ✅ Dependency Injection (DI using Autofac, DryIoc) A highlight of the software products I'm experienced with: ✅ Sparx Enterprise Architect ✅ JetBrains Rider IDE ✅ Confluence, JIRA ✅ Git ✅ Resharper, DotMemory, DotTrace ✅ VMWare (Fusion) ✅ Visual Studio 2019 IDE Other clients had this to say about my work with them: ❝Jason was a tremendous professional, outstanding architectural skills and understanding both technical and business requirements.❞ Brian V - COO - LaunchControl

  • Akka.NET
  • Solution Architecture
  • Solution Architecture Consultation
  • Software Consultation
  • Enterprise Software Development
  • TOGAF
  • Enterprise Architecture
  • Software Architecture & Design
  • Cloud Computing
  • .NET Core
  • C#
  • Microservice
  • Multithreaded Programming
  • API Development
  • Requirements Specification
Charlotte M.

London, United Kingdom

$60/hr
5.0
5 jobs

Exp.: Strategy Design | Project Manager | Creative Director | Music Curation | Events Production | Sound Design | Graphic Design | Brand identity | A&R | Music Distribution | Website Design I am an enthusiastic, and highly motivated professional with a proven track record. With experience in the music and fashion industries, I have honed my skills in both technical and artistic fields, making me a versatile candidate for a wide range of roles. I am confident in my ability to drive success for both the company and my team members. Working in a dynamic organization that values continuous learning and growth would be a true honor for me. I am eager to utilize my unique skillset to exceed expectations, foster strong relationships with all stakeholders, and contribute to the overall success of the company. ***Tech | Asana / Notion / Slack / G Suite / Chat GPT / Adobe CC *** Professional Experience: || Founder & Director of Odyxxey [2014-Pres] Part-time: A non-profit, R&D platform for contemporary sound. Offering radio & events platforming, artist development and bespoke creative solutions. • Established a strong online presence and brand visibility with wide influence in the UK music industry || Graphic Designer & Sound Designer [2014-Pres] Freelance: • Developed brand identities and assisted on design for dozens of projects in music and fashion || A&R Consultancy [2017-Pres] Freelance: • Successfully scouted and developed relationships with hundreds of people for the biggest independent music companies in London || Event Lead & Music Programmer [2022-2023]: • Coordinated the delivery of 10 month academic programme in partnership with the Mayor of London, managing a £200,000 budget. • Developed valuable relationships and drove sponsorships with Ableton & Arturia

  • Creative Direction
  • Project Management
  • Music Production
  • Music Playlist
  • Graphic Design
  • Booking Management System
  • Music & Sound Design
  • Music Marketing
  • Event Management
  • Music
  • Branding
  • Marketing
  • Marketing Strategy
  • Brand Consulting
  • Brand Strategy
Richard G.

Hereford, United Kingdom

$100/hr
5.0
9 jobs

New system build and legacy app modernisation & updating done right After working for more than 25 years in the Software industry, including many projects for public sector clients such as the NHS, National Strategy for Police Information Services and Ambulance & fire services, I have seen the good, the bad and the ugly of large and small scale projects. I've worked with all major technologies and stacks over my career, including Microsoft .NET / .NET Core, Azure, Node / JS etc as well as mobile development with Xamarin / React, and my experience means I'm always able to hit the ground running and add value quickly As well as undertaking new (Greenfield) development, I'm also happy taking Brownfield existing code and systems and updating them to newer technologies and architecture, while ensuring as much of the existing code is reused as possible to keep down costs and maintain confidence in the existing business rules, or adding new features to existing systems. I've also provided new mobile apps to existing legacy systems on both iOS and Android

  • .NET Framework
  • C#
  • Azure DevOps
  • SQL
  • Enterprise Architecture
  • .NET Core
  • Cross Functional Team Leadership
  • Agile Software Development
  • Microsoft Azure
Kajalben G.

Ilford, United Kingdom

$25/hr
4.7
136 jobs

I help startups, SaaS businesses, and growing companies turn ideas into scalable, high-performance web and mobile applications that drive real business results. With 4,400+ hours of proven development experience and $100K+ earned working with global clients, I specialize in building modern, user-focused applications using MERN Stack, Flutter, and React Native. From MVP development to enterprise-grade platforms. 💡 What I Specialize In: • Full Stack Web Development (MERN Stack) • Cross-Platform Mobile Apps (Flutter & React Native) • SaaS Product Development • Admin Dashboards & Business Platforms • REST APIs & Backend Architecture • Responsive UI/UX Implementation • Cloud Deployment & Performance Optimization 🛠 Tech Stack: • Frontend: React.js, Next.js, Tailwind CSS • Backend: Node.js, Express.js • Mobile: Flutter, React Native, Flutter Flow • Databases: MongoDB, MySQL • Cloud & Deployment: AWS, Vercel, Netlify, Heroku • Testing: Jest, React Testing Library • Languages: JavaScript, TypeScript Why clients choose me: • Top-tier communication & reliability • Business-focused development approach • Clean, scalable, maintainable code • Fast turnaround without compromising quality • Long-term support & proactive problem-solving I don’t just build apps. I build digital products that help businesses scale confidently. Whether you need a powerful SaaS platform, a modern mobile app, or a custom full stack solution, I’m ready to bring your vision to life. 📩 Let’s discuss your project and create something exceptional together. Keywords: Full Stack Developer, MERN Stack Developer, React.js Developer, Next.js Developer, Node.js Developer, Express.js Developer, JavaScript Developer, TypeScript Developer, Flutter Developer, React Native Developer, Mobile App Developer, SaaS Developer, Web Application Developer, Frontend Developer, Backend Developer, API Integration, REST API Development, MongoDB Developer, MySQL Developer, Tailwind CSS, AWS, Vercel, Admin Dashboard Development, MVP Development, Custom Software Development, Cross-Platform App Development, Startup Development, UI/UX Implementation, eCommerce Development.

  • MySQL
  • Web Development
  • Mobile App Development
  • React Native
  • React
  • JavaScript
  • Front-End Development
  • Web Design
  • API Integration
  • Node.js
  • Web Application Development
  • MERN Stack
  • Flutter
  • iOS
  • Android
  • TypeScript
  • Next.js
  • ExpressJS
  • MongoDB
  • Vercel

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