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## Senior .NET / C# Developer Senior .NET / C# Developer with 14+ years of commercial experience building, launching, deploying and supporting production systems. I specialize in backend development, enterprise applications, APIs, microservices and high-load systems. ### Core expertise * C#, .NET / .NET Core / .NET 6–8 * ASP.NET Core, ASP.NET MVC, Web API * REST, gRPC, SOAP, WCF, SignalR, WebSocket * Microservices and distributed systems * MS SQL Server, PostgreSQL, MySQL, Oracle, ClickHouse, Cosmos DB * Entity Framework, ADO.NET * Kafka and asynchronous messaging * Microsoft Azure * Docker, CI/CD, Git, Bitbucket, Azure DevOps * Unit testing and automated testing ### What I can do * Build a project from scratch and take it to production * Design and develop backend architecture * Develop and integrate APIs and microservices * Optimize databases and application performance * Work with large volumes of data and high-load systems * Maintain and modernize existing enterprise applications * Investigate complex production issues and improve system reliability I follow SOLID, KISS and DRY principles and focus on clean, maintainable and reliable code. I am open to Senior .NET Developer / Backend Engineer opportunities, including remote and international projects. Available for both long-term employment and contract-based work.

With over 25 years in software development, including two decades as a remote work freelancer, I bring a lot of expertise to your Java projects. I've partnered with over 40 companies across the globe, successfully navigating more than 60 diverse software initiatives – from intricate small-scale solutions to complex enterprise systems. My commitment to efficiency is amplified by my early adoption of AI tools in 2024, ensuring faster project completion without compromising quality. My journey began with formative years at Nokia Mobile Phones (1995-1997) and other Finnish IT firms, followed by international experience in Germany (2000-2002). Today, I continue to deliver top-tier remote development services from my base in Southeast Asia, offering a blend of deep technical skill, broad project experience, and a results-driven approach.

Senior iOS Engineer with 15+ years of professional experience developing applications for Apple platforms, backed by $100K+ earned and more than 5,000 hours of client work on Upwork. I specialize in building, maintaining, debugging and modernizing production iOS applications, with deep experience in Swift, Objective-C and UIKit. My strongest area is working with complex existing applications — particularly mature UIKit apps and mixed Objective-C/Swift codebases where understanding the existing architecture, solving difficult problems and making safe changes are more important than simply producing code quickly. I can help with: • iOS application development and long-term maintenance • Swift and Objective-C development • UIKit and complex custom interfaces • Mixed Objective-C / Swift codebases • Legacy iOS application modernization • Objective-C to Swift migration • Debugging, crash investigation and troubleshooting • Performance and memory optimization • REST API and backend integration • Firebase and AWS integration • Local and remote data management • Third-party SDK integration • Application architecture and codebase improvement • App Store preparation, submission and production support I have focused exclusively on Apple platforms since 2008 and have spent more than a decade developing and maintaining complex and enterprise iOS applications. My experience covers the complete application lifecycle: understanding requirements, architecture, UI implementation, networking and data integration, debugging, testing, optimization, deployment and long-term maintenance. I am comfortable joining an established development team or independently taking responsibility for an existing application. I am particularly interested in long-term projects where I can take technical ownership of the product and codebase. Have an existing iOS application that needs maintenance, modernization, debugging or an experienced engineer to take ownership of it? Send me a message and tell me what you're dealing with.

AI Video Ad & Commercial Creator | Scroll-Stopping Content for Product Brands I help product brands turn their products into high-converting video ads and commercials using cutting-edge AI video tools. From concept to final cut, I create scroll-stopping UGC-style ads, polished brand films, and social-first commercials that drive sales — fast and at a fraction of traditional production costs. What I Do: 🎬 AI Video Ads & Commercials: Photoreal, on-brand video content created with the latest AI video generation tools — no expensive film crews, studios, or long timelines required. 🛒 Product-Focused UGC: Authentic, native-feeling user-generated style ads built to perform on TikTok, Instagram Reels, YouTube Shorts, and Meta/paid social. ✨ Full Creative Direction: Hook writing, scripting, storyboarding, voiceover, captions, music, and editing — a complete done-for-you ad package. 🚀 Performance Mindset: Every video is built around a strong hook and clear call-to-action, designed to stop the scroll and convert viewers into customers. Featured Example — "Got Beef": For the Got Beef brand, I produced a series of AI-generated video commercials showcasing the product in a bold, attention-grabbing way — demonstrating exactly how AI video can give a product brand a premium, big-budget look without the big-budget cost. (Samples available on request.) Ideal For: • E-commerce & DTC product brands wanting fresh ad creative • Brands scaling paid social who need volume of video variations • Founders who want premium commercials without studio costs • Marketing teams looking to test new hooks and angles quickly Why Work With Me: ✅ Fast turnaround and unlimited creative angles ✅ Brand-consistent, platform-optimized output ✅ A marketer's eye — I build ads to sell, not just to look pretty ✅ Clear communication from brief to delivery Ready to give your product the ad it deserves? Send me a message and let's create video content that actually converts.

Transforming your exciting ideas into perfect software. I take software architecture and design as art. Over 11 years in web-dev, I’ve known tons of how to and how not to. Please check out my Highlights, Priorities, and the topmost Completed Job’s card before going on searching. I’m looking for a new long-term job in a few months. If you have an exciting product or idea that I could help implement, let’s talk about it. My Highlights: - Wide expertise in eCommerce (from inventory to fulfilment), Billing systems (from payments to intelligence), GIS - Architected and led development of projects with total of 100M+ USD lifetime turnover and no money loss incidents - Hired and led a team of 4 talented Rails developers for 2 years - 10+ years of consistent commercial development on Rails and Javascript - Lead developer on 10+ Rails/JS projects lived up to production usage - Integrated Rails projects with total of 30+ programs and platforms you have used or heard of and 100+ you haven’t - Mastered 50+ RubyGems that you’d likely include in your Rails applications My Priorities: - Making greatest possible value for the project, not just getting paid - Taking the most out of collaboration with product owners and teammates - Learning new skills and tools to keep up with modern development practices - Delivering reasonably perfect code following best practices

My qualification in web application development starts in 2002 1. I develop server-side applications using PHP and Go. I have experience in developing and maintaining high-traffic web applications that handle large volumes of data and ensure high availability. 2. I create microservices using PHP and Go. I have experience in creating microservices based on PHP and Go, using frameworks such as Yii1/Yii2, Laravel. I am familiar with microservices architecture and can design, develop, and deploy microservices. 3. I develop APIs and integrate with various services using PHP and Go. I am familiar with RESTful and SOAP APIs, as well as OAuth authentication integration and handling JSON and XML data. I have experience working with APIs for a variety of services such as Facebook, Twitter, Google, Slack, eBay, and more. 4. Databases. I have experience working with relational and NoSQL databases such as MySQL, Redis, and others. I can design databases, optimize queries, and use ORM. 5. Working with message queues and asynchronous programming in PHP and Go. I have experience working with message queues such as RabbitMQ, Redis, as well as with asynchronous programming using Goroutines. 6. Performance optimization and scalability. I know how to optimize database queries, work with caching. 7. Deployment and configuration of web servers. I have experience working with Apache and Nginx web servers and know how to configure them for high performance and security. 8. Security. I know how to ensure the security of web applications, including protection against XSS and SQL injections, as well as configuring SSL certificates and using the HTTPS protocol. 9. Teamwork and project management. I have experience working in a team and know how to use version control systems such as Git. I can manage projects using tools such as Jira and Trello. 10. Go programming language. I have experience working with the Go programming language. I am familiar with the language's core principles, such as concurrency and parallelism, and can develop high-performance web applications using Go. 11. Communication with clients. I have experience communicating with clients and understand the importance of meeting their needs and requirements during the web application development process. 12. Website automation. I have skills in automating websites using Selenium and Chromium tools. These tools allow me to create scripts that can simulate user actions on the website, such as filling out forms, clicking buttons, downloading reports, and uploading files. Such scripts can significantly simplify and speed up manual work, testing, and debugging of web applications. 13. Results-driven. It is important for me to achieve results in the projects I am involved in. I strive to do everything possible to achieve project goals within the established deadlines and with high quality. 14. Analytical skills. I have experience in analyzing project requirements and designing application architectures. I am able to assess the complexity of a task and choose the most effective solution. Overall, my expertise in web application development using PHP and Go, creating microservices, integrating with various services, working with databases, security and performance optimization, as well as other skills, allows me to solve complex tasks in the field of web development and achieve high results.