Since 1991 I have focused on writing quality business software. My specialties are in the areas of finance, investing, blockchain and insurance.
I have strong C/C++, C#, and Java/J2EE skills. I am comfortable developing for Windows, Unix/Linux, and mobile platforms.
I have worked extensively with Microsoft SQL Server, Oracle, kdb+ and MySQL database management systems and am confident in my skills.
While I do take on UI work, I spend most of my time on back-end services that are performant, scalable and fault tolerant.
C++
C
C#
Java
Windows Forms
Linux System Administration
Blockchain Architecture
J2EE
Haris I.
Austin, Texas
$30/hr
4.9
63 jobs
⭐️ Top Rated - Top 10% of talent on Upwork
💎 10+ years Experience in Freelancing
✅ 10+ years of experience in Software Engineering
✅ 500+ projects delivered successfully
✅ Excelling in delivering Fortune 500-scale projects
With over 10 years of experience as a seasoned Full Stack developer, I've collaborated extensively with Fortune 500 companies, specializing in MERN/MEAN, NextJS, Django, Flask, FastAPI, and Laravel stacks. My expertise covers standalone and API-driven web applications, token-based RestFul API servers, and microservices architectures. With a track record of over 500 reviews across various freelancing platforms, I possess the skills and knowledge to tackle both cutting-edge technologies and bespoke project requirements.
From refreshing the Aesthetics platform of Goals to enhancing user experience and conversion rates for e-commerce giant Jot, I've demonstrated my prowess in custom theme designs, e-commerce store development, and bespoke app/plugin creation. My portfolio speaks volumes about my ability to turn your personal or business concept into a resounding success.
Over the past 5 years, I've partnered with numerous Fortune 500 companies and renowned brands such as ThePicksInn, BlockyBites, The Savni Restaurant, Lernify, RoamEpic, and startups like TourPalz and ResumeFix. Completing over 100 projects for companies spanning 38 countries, I pride myself on maintaining a 100% track record of on-time project delivery — adhering to deadlines is a cornerstone of my work ethic.
Whether you need expertise in a specific technology, tool, framework, or library, or are searching for a dedicated and skilled development partner to bring your project to life, I am the ideal candidate for the job.
Let's connect and explore how I can assist you in achieving your goals!
C++
MERN Stack
React
React Native
Django
JavaScript
Flask
Front-End Development
Python
FastAPI
Artificial Intelligence
C
Data Scraping
AI Agent Development
AI App Development
Phillip L.
Raleigh, North Carolina
$50/hr
5.0
6 jobs
Let me show you both high performance and maintainability with Microsoft SQL Server. I’ve had over 12 years of experience in back-end SQL Server design and development. Clients and users have been consistently delighted with the results.
I enjoy the creativity of designing and developing solutions—solving your problems and implementing your vision. I also find maintenance and performance optimization both challenging and satisfying. There’s nothing like using my experience to turn a painfully slow feature into a powerful resource for the user.
Even with the best tools and design, many applications will eventually run into acute performance issues: workloads increase, features are added, and previously hidden flaws take center stage. When correcting performance issues, I do a thorough analysis to determine the cause, using corrections that minimize the risk of introducing bugs—or of only partially correcting a problem.
I’ll work with you to achieve your goals. My career has included development, hands-on management, and freelance contracting: you can rely on my project management and communication skills. I’ll get things under control while keeping an eye on maintaining your commitments and plans.
Although I also have extensive experience in C# and ASP.NET front-end web site development, I am currently focusing my Upwork job searches on Microsoft SQL Server database design, development, and performance optimization opportunities.
My software consulting business has been providing solutions for over 25 years. I take pride in understanding how my contributions fit into your business processes and objectives. Although an hourly freelancer, my two largest clients considered me a part of their teams—each extending my contracts to over 12 years. I am currently available for part-time projects, or assignments lasting up to several months.
Please tell me what I can do for you.
C++
Microsoft SQL Server
Transact-SQL
Stored Procedure Development
Performance Optimization
SQL Server Reporting Services
C#
ASP.NET
ASP.NET Web API
Microsoft Windows
Windows App Development
Windows API Development
Technical Writing
Editing & Proofreading
Project Management
Keith D.
West Monroe, Louisiana
$40/hr
4.0
1 jobs
A short bit about myself. Software development ALONG with network and database design/development, network & systems engineering, and network, systems, and program administration.
The development over the years comprised of backend creation, maintenance, and using/developing APIs; mostly for device setup/administration/and monitoring (with many things connected to networks *and* OS; CORE language being PERL). ALSO about 30-35% involved interacting with backend to do UI presentation mostly in web; but *some* mobile. Much of this was also considered as lead positions, with varying responsibilities, including project management, training, documentation, presentation and planning, and DevOps (Project Manager).
I have worked in communications through the years starting with BBS's, to Bayou Internet, to Centurylink (Lucent) to AT&T. I have also worked with many in different facets of government (mostly concerning court and inmates), and private/corporate situations involving payroll, logistics, and medical.
I do programming, network design, administration, and database engineering. The only reason I don't have any current certifications is economic.
Perl
PHP
DevOps
Systems Engineering
Linux System Administration
Network Administration
Juniper
Cisco IOS
Database
Clayton E. T.
New Smyrna Beach, Florida
$147/hr
4.6
45 jobs
Highly trained and experienced analytics expert using proven and state-of-the-science statistical methods to help eliminate waste, maximize return on investment, and improve business processes.
Experienced .NET specialist specializing in custom Windows or Web-based applications that help make better decisions, track inventory and increase efficiency, improve marketing efforts, manage supply chain, and provide other analytics-based solutions.
Python
Deep Learning
SQL
Microsoft Excel
Machine Learning
Data Science
C#
Financial Analysis
Data Analysis
Data Visualization
Julia
Statistics
Business Intelligence
Microsoft Azure
Numan U.
Sacramento, California
$40/hr
4.8
69 jobs
𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗣𝗹𝘂𝘀 | 𝟭𝟬𝟬% 𝗝𝗼𝗯 𝗦𝘂𝗰𝗰𝗲𝘀𝘀 | 𝟭𝟯+ 𝗬𝗲𝗮𝗿𝘀 | 𝟴,𝟬𝟬𝟬+ 𝗨𝗽𝘄𝗼𝗿𝗸 𝗛𝗼𝘂𝗿𝘀 | $𝟮𝟬𝟬𝗞+ 𝗘𝗮𝗿𝗻𝗲𝗱 |
I'm a senior .NET / C# developer and Azure cloud architect who builds and scales production systems for companies that can't afford downtime or rework — healthcare platforms, fintech products, e-commerce systems, and real estate/property-management software.
If your project needs more than someone who writes code to spec — if you need someone who can architect the solution, own the delivery, and still be there for support six months later — that's the role I take on.
WHAT I BUILD
────────────────────────
✦ SaaS Platforms — multi-tenant, subscription-based .NET Core / Azure applications built to scale from a handful of users to enterprise volume
✦ Healthcare Systems — HIPAA-aware EHR/EMR platforms, HL7/FHIR integrations, and clinical workflow tools built to compliance standards
✦ Fintech & Payments — secure transaction processing, Stripe/PayPal integrations, reporting and reconciliation systems, PCI-conscious architecture
✦ E-Commerce Platforms — custom storefronts, order/inventory management, and integrations with payment gateways, CRMs, and ERPs
✦ Real Estate & Property Management Systems — listing platforms, tenant/lease management tools, and workflow automation for property teams
✦ AI-Powered Features — OpenAI/LLM integrations, intelligent document processing, and AI-assisted workflows added to existing .NET applications
✦ Legacy Modernization — turning outdated ASP.NET/VB.NET systems into maintainable, cloud-ready .NET 8 platforms without breaking what already works
TECH STACK
────────────────────────
+ Backend: C# · .NET 8 / .NET Core · ASP.NET Core · ASP.NET MVC · Web API · Entity Framework Core · LINQ · Blazor · SignalR · Microservices · REST & SOAP APIs
+ Frontend: Angular · React · TypeScript · JavaScript · HTML5 · CSS3 · Blazor UI
+ Cloud & DevOps: Microsoft Azure (App Services, Functions, AKS, Service Bus, Key Vault, Azure SQL) · AWS (EC2, Lambda, RDS, S3) · Azure DevOps · GitHub Actions · CI/CD · Docker · Kubernetes · Infrastructure as Code
+ Databases: SQL Server · PostgreSQL · Cosmos DB · MongoDB · Stored Procedures & Query Optimization for high-volume systems
+ Integrations: Stripe · PayPal · Twilio · SendGrid · OAuth 2.0 · HL7 · FHIR · CRM/ERP integrations
HOW I WORK
────────────────────────
I stay involved from architecture through deployment — writing clean, documented, production-ready code, and communicating progress clearly at every step. I manage scope, timelines, and stakeholder expectations as carefully as I manage the codebase itself. Depending on what your project needs, I can work as a hands-on senior engineer, a solution architect, or a long-term technical lead.
I'll tell you honestly, early, if I'm the right fit for what you're building. Send me your project scope and I'll respond within a few hours.
C#
Microsoft Azure
Azure DevOps Server
ASP.NET
ASP.NET MVC
ASP.NET Core
.NET Framework
AWS Development
Azure DevOps
DevOps
ADO.NET
Microsoft SQL Server
Web Form
ASP.NET Web API
.NET Core
VB.NET
.NET Stack
Azure App Service
Angular
DevOps Engineering
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