Individual with 27,000+ hours worked on Upwork with 100% JOB SUCCESS.
My experiences:
✓ OOP and System Design;
✓ Theoretical knowledge and practical experience with design patterns;
✓ Asynchronous and multithreading development (TPL);
✓ Rest API design, architecture and implementation;
✓ 3rd party API integration using existing packages or from scratch;
✓ Microservices and monolith architectures;
✓ GIT (Azure DevOps, github, bitbucket), SVN and TFS version control systems;
✓ .NET / .NET Core C#;
✓ TypeScript;
✓ JavaScript (jQuery, linq.js, lodash, underscore, moment, HighCharts);
✓ CSS/LESS/SASS, Bootstrap, Bootswatch;
✓ XML, XSLT, Serialization/Deserialization (XML, Binary, JSON);
✓ ASP.NET Core;
✓ ASP.NET MVC / Web API;
✓ AngularJS 1.x, Angular 2-21;
✓ React (basic);
✓ Kendo UI (JS and ASP.NET MVC wrapper) and DevExtreme;
✓ Bootstrap, Bootswatch;
✓ SMS integration (Twilio, Plivo, SMSru);
✓ Payments integration (Authorize.Net, Chargify, Stripe, Hint, Paymentwall)
✓ Email integration (SendGrid, MailGun, Gmail, custom SMTP);
✓ Reports integration (PowerBI, LogiReports, Crystal Reports);
✓ Medical partners inegration: Hint, Redox, EazyScripts, AthenaHealth, PokitDok, RxNT;
✓ SignalR;
✓ Microsoft Azure (Azure SQL, Azure AD, MobileApp, WebApp, ApiApp, Azure Storage, EventHub, Stream Analytics, Application Insights and others);
✓ AWS (EC2, Load balancer, ECS, S3, DynamoDB, Redis);
✓ WCF and WebServices;
✓ Entity Framework (Full and Core)
✓ LINQ and Dynamic LINQ;
✓ Database architect and optimization including Microsoft SQL/T-SQL;
✓ Caching (Redis);
✓ Brokers: RabbitMQ, MSMQ, Kafka, Azure Service Bus
✓ .NET Desktop (WinForms, WPF: MVVM, MVP);
✓ .NET for MacOs;
✓ Telerik, DevExpress, ComponentOne frameworks for WinForms and WPF;
About me:
• 16+ years of professional experience in all stages of the SDLC (Software Development Life Cycle) involving studying of the user requirements, analyzing, designing, implementation, testing, deployment, documentation and maintaining of various stand-alone, intranet, client-server and web-based projects with exposure to diverse business domains including Retailing, Medical, Financial and Banking
• 12+ years of non-stop experience of working remotely and locally with companies located in USA and Germany
• 8+ years of non-stop UpWork experience
• Strong skilled in .Net technologies
• Experience in developing cross-platform applications
• Experience in client / server web-technologies
• Solid background in computer science
• Ability to work well within tight deadlines and under pressure
• Self-motivated
• Good team player with excellent coorganizational and mentoring skills
• Fluent level of English
RESTful API
.NET Framework
C#
ASP.NET Core
SQL
API Integration
API Development
Electronic Medical Record
Model View ViewModel
ASP.NET Web API
Payment Gateway Integration
Telemedicine
Telerik
Angular
.NET Core
Microsoft SQL Server
RabbitMQ
Google Protocol Buffers
ASP.NET MVC
Windows Presentation Foundation
Denis D.
Larnaca, Cyprus
$23/hr
5.0
1 jobs
Your developer says it’s ready.
But it hasn’t been properly tested.
You’re investing in AI, automation, or a SaaS build, and you’re not completely confident everything was architected, validated, and structured properly.
Your marketing lead says the strategy is working.
But the numbers don’t fully support it.
That’s where I step in.
I help founders turn ideas into structured products, clear requirements, scalable architectures, and actionable development roadmaps.
From product discovery and MVP planning to launch and validation, I make sure teams are building the right thing, not just building features.
Not just functional.
Reliable. Scalable. Ready for real users.
I recently started my freelancing profile, but I’m bringing hands-on experience from real SaaS, AI, automation, product, and growth environments.
What I Deliver
- Product discovery, requirements gathering, and documentation
- MVP planning, feature prioritization, and roadmap definition
- AI, SaaS, web, and mobile product strategy
- Architecture planning, solution validation, and workflow design
- Development team coordination and delivery oversight
- Internal testing, demo reviews, QA coordination, and product validation
- Growth-aligned product planning including acquisition, retention, automation, and lifecycle systems
I work directly with founders and teams to bring structure to projects that have become unclear, overloaded, or difficult to execute.
I lead projects directly. When additional expertise is required, I collaborate with a trusted network of specialized developers and technical experts to ensure the right capabilities are applied at each stage of delivery.
Feel free to reach out if you'd like to discuss your project.
~Business Skills Expertise
AI Product Management, Product Strategy, Product Discovery, Product Roadmapping, MVP Development, Startup MVP Structuring, Product-Market Fit Validation, Requirements Gathering, Requirements Analysis, User Stories Definition, Acceptance Criteria, Product Documentation, Agile/Scrum Workflows, Sprint Planning, Backlog Prioritization, Feature Prioritization, Release Planning, Project Management, Stakeholder Management, Stakeholder Communication, Cross-Functional Collaboration, Technical Team Coordination, Delivery Oversight, UAT (User Acceptance Testing), QA Coordination, Go-to-Market Strategy, SaaS Scaling Strategy, Business-Technical Alignment.
~Technical & AI Product Familiarity
RAG Systems, LLM Applications, Generative AI Systems, AI Agents, AI Chatbots, Conversational AI, OpenAI, Claude, LangChain, Vector Databases, Prompt Engineering, AI Automation, Workflow Automation (n8n, Make, Zapier), API Integrations, Knowledge Base Systems, Document Intelligence Systems, AI SaaS Platforms, AI Workflow Design, AI Use Case Validation.
~AI Development & Prototyping Tools
ChatGPT, Claude, Claude Code, Cursor, Windsurf, Lovable, Bolt.new, Base44, Replit, AI-Assisted Development, Vibe Coding, Rapid Prototyping, AI-Powered MVP Development.
~Website & CMS Platforms
WordPress, Elementor, WooCommerce, CMS Management, Landing Page Planning, Lead Generation Websites, E-commerce Websites.
~Product & Delivery Tools
Jira, Atlassian, Confluence, GitHub, GitLab, Notion, ClickUp, Trello, Linear, Figma, Miro, Sprint Management, Backlog Management, Issue Tracking, Product Documentation, Development Workflow Coordination.
~Marketing & Growth Expertise
Growth Strategy, AI Marketing Automation, Facebook Ads (Meta Ads), Google Ads, TikTok Ads, UGC Campaign Structuring, Paid Acquisition Strategy, Funnel Strategy, Conversion Optimization, Customer Lifecycle Systems, Retention Mechanics, E-commerce Growth Systems.
~Product & Platform Focus
AI SaaS Platforms, AI-Powered MVPs, Workflow Automation Systems, CRM Platforms, Mobile Applications, Web Applications, Marketplaces, Creator Platforms, B2B Platforms, Internal Business Tools, Customer Support Platforms, Knowledge Base Systems.
~Industry Expertise
SaaS, FinTech, E-commerce, B2B Platforms, Marketplaces, LawTech, Healthcare & Telemedicine, Creator Economy Platforms, Educational Platforms.
~~~Most projects don't fail because people aren't working hard. They fail because nobody stopped to structure them properly.
Artificial Intelligence
Large Language Model
Generative AI
AI Agent Development
Marketing Strategy
AI App Development
SaaS Development
Web Development
AI Mobile App Development
Python
PostgreSQL
React
Project Management
Technical Project Management
Stakeholder Management
Charalambos K.
Limassol, Cyprus
$25/hr
5.0
2 jobs
Hello! I’m a passionate and experienced Unity Game Developer with over 5 years of professional experience in game development, specializing in C# programming, custom systems design, and performance optimization. I’ve worked on a variety of projects ranging from casual mobile games to my current solo endeavor—a medieval ARPG featuring custom-built systems and a unique gameplay experience.
My expertise lies in crafting high-quality, scalable, and efficient game systems while delivering polished solutions that meet client expectations. Whether you need help with building new features, optimizing existing codebases, or creating robust tools for your project, I am here to help!
What I Can Do for You
Custom Game Systems Development: From combat mechanics to resource management, I design modular and scalable systems tailored to your game’s needs.
Performance Optimization: Using Unity’s profiler and best practices, I ensure your game runs smoothly on all target platforms.
Custom Tools & Frameworks: Need a unique tool or system? I’ve developed my own ECS architecture, physics engine, and resource management pipelines.
Bug Fixing & Code Refactoring: I specialize in cleaning up legacy codebases and improving stability while reducing bugs.
Full Game Development: From prototyping to launch, I can handle end-to-end game development tasks.
Notable Achievements
Developed a custom physics engine for my solo ARPG project, outperforming Unity’s built-in physics for my specific use case.
Refactored the crossword engine at Qiiwi Games, improving flexibility and reducing bugs.
Led the development of Miss Merge at TrueMyth Games—the studio’s first profitable title with thousands of daily active users.
Delivered 10+ heroes with unique abilities for Holyday Studios’ Firestone, accelerating content delivery timelines.
Technical Skills
Game Engines: Unity (5+ years)
Programming Languages: C#, C, C++
Systems: Combat, Physics, VFX, Projectiles, Addressables
Tools: Shader Graph, Git, Jira
Practices: ECS Architecture, SOLID Principles, Agile/Scrum
Why Work With Me?
I bring a combination of technical expertise and creative problem-solving to every project. My approach is highly collaborative—I take the time to understand your vision and deliver results that exceed expectations. Whether you’re looking for a developer to join your team or someone to take ownership of specific tasks, I am committed to providing top-notch solutions.
Let’s create something amazing together! Feel free to reach out—I’d love to discuss your project.
C#
Unity
Game Development
SQL
C
C++
Golang
Python
Panagiotis A.
Nicosia, Cyprus
$15/hr
5.0
1 jobs
Looking for part-time, freelance opportunities in GIS, Google Maps API, SQL programming, web development.
QGIS
JavaScript
Google Maps
GIS
SQL Programming
Aliaksandr F.
Limassol, Cyprus
$15/hr
4.0
1 jobs
Greetings! I am an experienced web developer with over 6 years of expertise in creating modern, responsive, and functional web applications for small and medium-sized businesses and also fixing and improving working applications. I strive to deliver high-quality digital solutions tailored to the unique needs of each client.
- I carefully listen to clients, strive to understand their business processes and goals, to offer the most effective solution.
- I believe communication is the key factor for a successful project. I regularly provide status updates and promptly respond to inquiries.
- Adhering to high code standards, conducting thorough testing before deployment to ensure stable and error-free applications.
- Keeping up with new technologies and trends. Participating in professional conferences and exploring new tools to enhance my work efficiency.
I am ready for new challenges and eager to collaborate on projects that will bring success to your business. Feel free to reach out to me to discuss details and ask any questions.
Git
Web Application
Product Development
Web Development
International Development
Scripting
Ecommerce
Testing
Design Concept
Laravel
React
SQL
PHP
CMS Development
Golang
AI App Development
AI Development
Inna A.
Limassol, Cyprus
$10/hr
4.6
1 jobs
Hi! I'm a front-end developer with strong experience in HTML5, CSS3, and responsive web design. I specialize in pixel-perfect layouts, email templates. I work confidently with design tools like Figma and Photoshop and use preprocessors like SASS to keep my code clean and scalable.
My key skills include:
Semantic and accessible HTML
Cross-browser and mobile-friendly CSS
Email template development
BEM methodology
Git version control
Build tools (Gulp, Webpack)
I have worked with companies like PSD2HTML, FxPro, delivering high-quality markup for various types of projects.
Let’s work together to bring your designs to life!
Web Development
HTML5
Figma
CSS 3
SCSS
CSS Grid
PSD to HTML
Landing Page
Responsive Design
Bootstrap
Website Optimization
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