I've been a web application developer for over 10 years now with a wide range of experience in major markets.
I've recently partnered with a very experienced marketing expert to start my own company, Ctrl+Alt Digital to provide a one stop shop for all your digital and technical needs. Our goal is to help clients and peers successfully achieve their digital and technology goals and continue to grow to reach their business milestones.
We've worked on many site redesigns and have built complex custom applications for multiple clients in the grocery industry, women's, sports and furniture retail, financial and construction industry working with custom solutions in Content Management systems such as Magento, Wordpress and Orchard CMS and also building from the ground up custom solutions using ASP.NET Core in Azure cloud.
We've been exposed to many industries which all have their unique problems, but their is always a solution! We use our experience to help design and propose the most cost effective working solution for your business.
C#
Database Design
WordPress
SQL
ASP.NET
JavaScript
ASP.NET MVC
.NET Framework
Microsoft Azure
Azure App Service
Microsoft Azure SQL Database
HubSpot
Zapier
Automation
Anthony S.
Clearwater, Florida
$150/hr
5.0
141 jobs
Web app developer building production web applications for B2B companies full-stack web apps, SaaS platforms, client portals and MVPs that ship as working software, not slide decks.
Senior full stack web application developer. React / Next.js, Node, TypeScript, Python / FastAPI, Supabase / PostgreSQL, AWS. 126 projects, 100% Job Success, Top Rated Plus, $200K+ earned.
Most companies don't need "an AI project." They need a web app that is fast, responsive, secure and maintainable with AI layered in only where it earns its place.
WHAT I BUILD:
▪ Custom web app development: React/Next.js, Node, TypeScript, Python/FastAPI, PostgreSQL, Supabase, AWS, Docker
▪ SaaS web applications & MVPs: Multi-tenant architecture, user authentication, role-based access, Stripe billing, admin panels, analytics dashboards, client portals, internal tools
▪ Web app design & UI/UX: Responsive, mobile-first web application design from wireframe to production. UI/UX web app work and the front-end build handled by one person, so nothing is lost in handoff
▪ Progressive web apps: Installable, offline-capable PWAs that feel native without an app-store release
▪ Web optimization: Core Web Vitals, page speed, query and render performance, scaling an app that outgrew its first build
▪ Web application modernisation: Rebuilding no-code, page-builder and legacy builds as real React/Next.js applications
▪ API development & integrations: REST APIs, webhooks, Stripe, CRM sync, third-party services
▪ AI web apps, when the product actually needs it, RAG over your own data, LLM features, Claude/OpenAI and MCP integrations
HOW I WORK:
Two ways to engage:
→ Build a web app or MVP. You know what you want, a SaaS dashboard, a multi-tenant platform, a customer portal, an internal tool, a PWA. I architect it and ship it with tested, documented, maintainable code. Most MVPs ship in weeks, not quarters.
→ Clarity Audit (discovery first). Not sure where to start? I assess your product, data and workflows, then hand back a prioritised roadmap: realistic timelines, cost ranges, and the two or three highest-impact things to build first.
AI-accelerated, human-led. I use modern tooling to move fast, but every web application ships with tests, documentation and code a senior engineer would sign off on. Clients who have been burned by no-code or page-builder builds hire me to rebuild them properly.
WHERE I'VE DELIVERED:
126 Upwork projects across EdTech, Pharma, Real Estate, Logistics, Financial Services and CRM platforms membership portals with gated analytics, multi-portal web apps with role-based access, subscription platforms with mobile-to-web data sync, two-sided marketplaces with advanced search, B2B customer portals with order tracking, and multi-tenant SaaS.
Based in Clearwater, Florida. US-based, native English, overlapping hours with US and EU teams.
Send a message with your goal. On a 30-minute call I'll tell you whether you need a web app developer for a fixed-scope build or a Clarity Audit first.
Web Application
Web Application Development
Web Development
Web Design
Progressive Web App
Full-Stack Development
React
Next.js
JavaScript
TypeScript
Node.js
PostgreSQL
Supabase
API Development
SaaS Development
Python
FastAPI
Artificial Intelligence
AI App Development
Retrieval Augmented Generation
Andrew C.
Miami, Florida
$200/hr
5.0
7 jobs
I am an experienced startup founder having served the Fortune 500 for 6+ years with high volume automations and applications annualizing returns of 7-figures.
Now, I design and ship production-ready version 1 products and automation systems for teams that have an idea but need clarity on what to build first and how to make it actually work in the real world.
I work like a technical co-founder / systems architect: define the workflow, pressure-test the constraints, cut scope to what matters, and ship something that gets used.
Typical problems I’m brought in for:
- “We know this should be automated, but not sure where to start.”
- “We need an MVP fast, but it HAS to be scalable, reliable, and secure”
- “I built an application but how can I get people to access it?”
How I Work
I don’t start with tools. I start with workflow responsibility and risk mitigation.
1. Workflow & Constraint Mapping (1 week)
- Inputs, decisions, edge cases, handoffs
- Where automation is safe vs assist-only
- What must be hallucination free
2. Scope Lock & Risk Elimination(1 week)
- Strip to the smallest version that still holds up
- Push unclear ROI paths down the road
- Define success metrics before building
3. Production-Grade Build(2-3 weeks)
- Real auth, real data flows, real error handling
- AI integrated where it improves speed or accuracy
- Designed to survive real usage, not demos
4. Iterate on Reality(1-2 weeks)
- Usage data > opinions
- Tight feedback loops
- No endless discovery cycles
What You Get
- Senior-led "Version 1" systems designed to for the real world, not demos
- AI agents, and automation systems embedded in real workflows
- Clear architecture and handoff (documented so anyone else can pick up)
- Systems that reduce manual effort, error rates, or cycle time
- A technical engineer experienced in managing project(s)
Typical Outcomes
- Your "Version 1" shipped in 30 days
- 70–90% reduction in manual workflow steps
- Fewer handoffs, fewer mistakes, clearer ownership
- Systems that teams actually keep using
Who This Is For
- Founders who need a credible first version
- Legal, ops, or compliance-heavy teams where accuracy matters
- Businesses with real workflows and real consequences
- Teams without in-house AI, architecture or project leadership
Core Services
- Senior-Led AI & Automation "Version 1" Products
- Workflow-Driven System Design
- Technical Project Management
- AI Agent Architectures
- Automation & Integration (Legal, Ops, Compliance)
- MVP Scoping & Architecture Reviews
- Technical Stack (Used Pragmatically)
- Python, FastAPI, background workers
- LLMs, RAG, structured extraction, decision support
- Cloud-native deployments (AWS/GCP)
- Event-driven automation, queues, CI/CD
- Secure data handling, audit-ability, role-based access
If you're ready to work with someone who will be transparent, deliver what they said they would, desires mutual success, and has an obsession with excellence, let's talk!
AI Consulting
Robotic Process Automation
API Integration
API Documentation
Data Integration
Jira
Make.com
n8n
Vector Database
AI Development
AI Implementation
OpenAI API
Legal Pleadings
Web Development
Software Development
Technical Project Management
Project Management
Product Management
AI App Development
AI-Generated Code
Camilo F.
Miami, Florida
$75/hr
5.0
44 jobs
Experienced Full-Stack Developer | Cloud-Based Solutions | Web & Mobile Applications
I specialize in building modern, cloud-based web and mobile applications, helping businesses transform their ideas into powerful digital solutions. With expertise in both frontend and backend technologies, I create scalable, secure, and user-friendly applications.
What I Can Do:
Web Application Development: I design and develop robust web applications tailored to your specific needs.
REST API Design & Implementation: I create and integrate APIs using PHP, ASP.NET Core, or Node.js, ensuring high performance and seamless communication between services.
Database Architecture: I design and optimize relational databases using SQL Server, MySQL, or PostgreSQL for efficient data management.
UI/UX Development: I convert design documents into fully functional, interactive user interfaces, providing a great user experience.
Cross-Platform Mobile Apps: I develop mobile applications using Xamarin or Flutter, ensuring smooth performance across iOS and Android platforms.
Cloud Deployment: I deploy applications to Google Cloud Platform (GCP), ensuring scalability, security, and high availability.
API Integrations: I integrate web applications with popular APIs such as Google APIs (Drive, Sheets, Maps, etc.), enabling advanced functionality.
Technologies & Tools I Use:
Frontend: Angular, TypeScript, HTML5, CSS3
Backend: NestJS, ASP.NET Core Web API, Laravel, Lumen, Express
Database: SQL Server, MySQL, PostgreSQL, EntityFramework, Sequelize, Eloquent, Doctrine, TypeORM
Real-Time Communication: Socket.io
Mobile Development: Xamarin, Flutter
Cloud & Deployment: Google Cloud Platform (GCP), Docker, Kubernetes
Third-Party Integrations:
Authentication: Auth0
SMS/Voice: Twilio
Email: SendGrid, SendInBlue
Google APIs: Google Drive, Google Sheets, Google Maps, Google Places
Let’s discuss how I can help you build the next successful web or mobile application!
Web Application
CSS
HTML
NestJS
Auth0
.NET Core
Google Apps Script
Google APIs
Angular
Node.js
Progressive Web App
PHP
Laravel
Google Cloud Platform
NestJS Development
Flutter
Business with 100-999 Employees
In-App Search
Patrick H.
Gainesville, Florida
$125/hr
4.8
24 jobs
Senior ColdFusion Architect | Legacy System Modernization | CF7-CF2025 Upgrades |
Lucee Migration | SQL Server / MySQL Expert
Profile Overview
Top Rated PLUS Freelancer with $200K+ Earned on Upwork
100% Job Success • 18 Client Engagements • Long-term client relationships
Senior web developer and ColdFusion architect with 30+ years of experience specializing in legacy system modernization, web development, database architecture, and performance optimization.
I help organizations stabilize, upgrade, and modernize ColdFusion applications that have been running critical business systems for many years. Many companies still rely on ColdFusion systems built 10–20 years ago, and I specialize in bringing these systems up to modern standards while maintaining stability and minimizing downtime.
My experience spans the entire software lifecycle including requirements analysis, system architecture, development, performance optimization, and production troubleshooting.
Core ColdFusion Modernization Services
• ColdFusion upgrades (CF7 → CF2025)
• Lucee migrations
• Database refactoring (SQL Server / MySQL)
• Security hardening (bcrypt, authentication modernization)
• Performance optimization
• Legacy code documentation and stabilization
ColdFusion & CFML Expertise
Extensive experience across multiple generations of the platform:
ColdFusion 3 / 5 / 8 / 9 / 10 / 11 / 2016 / 2018 / 2021 / 2023/ 2025
Railo 4.2
Lucee 5.0 / 5.3
This long-term platform experience allows me to work effectively with older legacy systems as well as modern CFML environments.
Database Expertise
Experienced database architect and administrator working with:
• Microsoft SQL Server
• MySQL
• MS Access
Areas of focus include:
• Database design
• Query optimization
• Stored procedure development
• Performance tuning
• Data migration and integration
Full-Stack Development Skills
In addition to CFML development, I work across modern web technologies including:
• JavaScript / jQuery
• Python
• Bootstrap
• WordPress / PHP
• REST APIs
• Postman
Development Approach
I bring a practical business-focused perspective to development projects. As a former CPA, I understand business logic, financial systems, and operational requirements, allowing me to design solutions that balance:
• Technical excellence
• Business priorities
• Project timelines
• Budget constraints
Typical Projects
Typical engagements include:
• Rescuing legacy ColdFusion systems
• Upgrading ColdFusion servers and codebases
• Migrating applications to Lucee
• Debugging production issues in legacy systems
• Database optimization and refactoring
• Documenting large legacy codebases
Availability
Available for:
• Ongoing development work
• Modernization and migration projects
• Production system troubleshooting
• Long-term consulting engagements
Ready to begin work immediately.
Complete Client Feedback:
"Patrick did outstanding work for us. He was very timely and efficient in addressing our urgent needs. I would recommend Patrick to anyone needing help with coding or database issues."
— CF2016 Programmer Needed project
"Patrick is knowledgeable, thorough, thoughtful and was available to meet my needs. All around great guy to work with!"
— ColdFusion/SQL Database Optimization project
"Patrick maintains, updates, and enhances our custom ColdFusion website. He is part of our team, and we can always count on him. Patrick has consistently delivered excellent results."
— Part-Time ColdFusion Developer project
"Patrick was a delight to work with. Not only does he have a great amount of experience, he is very personable and a good communicator. Whenever I emailed him, I would receive a response in minutes."
— ColdFusion Developer project
"Patrick is a pleasure to work with. He is communicative, knowledgeable, and organized. He successfully navigated some tricky situations and helped strengthen our team with his skills and kindness."
— Full-Time ColdFusion Developer project
MySQL
Python
SQL
Adobe ColdFusion
MySQL Programming
Microsoft Excel
WordPress
Microsoft Access
Bootstrap
API
Lucee
JavaScript
Website Migration
AI Chatbot
AI Development
Myroslav K.
Aventura, Florida
$69/hr
5.0
52 jobs
10+ Years as a Full stack developer and Fractional CTO - using React.js, React-Native, Vue.js, Node.js, Next.js, Nest.js, and overall Full stack development in web and mobile.
10+ Years specifically building SaaS projects. SaaS development from MVP to complex high loaded products.
10+ Projects built with high user load in the role of Full stack developer - Delivered robust applications with a 100% job success score. (As an example app called Niya has over 💲 50.000 💲 active users)
As a Full stack developer - I’m using in frontend (React, Next.js, React Native Tailwind, shadcn and other style UI libraries, Vercel), backend (Node.js, MongoDB, PostgreSQL) Neon, Render, also deep work with supabase (popular for AI Vibe coding). Also as a Full stack developer I made over 15 apps using React Native CLI and React Native Expo, so I’m open to mobile app developer opportunities. I used to work separately as a web developer only as well. As a Fractional CTO I gained a skill to be more specific on the project stack based on project goals, budget and plans.
Performance & Scalability - Being Full stack developer is not only to build and ship it’s also to optimized solutions for speed, SEO, and scalability. I have worked on SEO on domains with high domain authority. Worked a lot with different backend infra providers. Starting some basics, like serverless solutions, finishing AWS services.
Agile Collaboration - Transparent communication, iterative workflows, and timely delivery. I used to be on some projects in the role of project manager as well, I know the right way to manage things. I handle the entire development lifecycle, from React Native UI UX design to backend architecture, API integration, cloud deployment, overall a whole full stack delivery..
Hey, I’m Myroslav, a full stack developer and Fractional CTO on steroids with AI usage and large knowledge as a React developer & Senior web developer & IOS developer & Android developer as well. with over 10 years of experience since 2016, specializing in the Full stack development with different technologies React.js, Node.js, Next.js, Nest.js, React-Native CLI, React-Native, Expo, Vue.js, in generally mostly javascript based. I really love mern and mern stack in general, but nowadays I'm using PostgreSQL for most of the projects.
My focus as a full stack developer is to deliver a fully functional, and production ready MVP for you within 20-40 days, you don’t need to hire ux designer, I’ll handle everything in house. ). I can even handle your "Replit" or "Base44" or "Lovable" or any other AI/Vibe-coding tools you used to make your project. Making sure that we have a great structure & architecture of the application, and making sure it’s ready to get heavy lifting features later on, and supporting hundreds of thousands requests hourly bases. My Fractional CTO experience will bring a new breath to your project.
Industries:
In the past I worked a lot with heavy loaded services that requested difficult mapping, maps, routes integration, orders functionality, complex payment integrations. Also worked many times with Health and Wellness, Transport & Geo, Retail, Dating and Lifestyle, Food Delivery, Fintech and Banking, Entertainment and Media, Logistics and Manufacturing, Productivity and Education, Marketplaces and Advertising, Automotive and Travel.
Frameworks and staff: as a full stack developer, I used a lot of mern and mern stack. I also have experience working as a react developer or web developer only, and full stack developer django in the past. For the last 4 years I've been actively going deep into LLMs and machine learning which is mostly python based, so I’d say I can call myself a senior python developer as well.
Let’s Connect!
GET YOUR MVP WITHIN 20 DAYS!
Click the “Invite to Job” button, and let’s discuss turning your idea into reality.
Web Application
CSS
HTML
API
JavaScript
React
Node.js
Software Development
Full-Stack Development
API Integration
PHP
Python
Vue.js
Laravel
WordPress
HTML5
Tailwind CSS
Web Design
Software Architecture & Design
MySQL
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