💡 Let a proven leader to turn your tech vision into reality. We build scalable solutions, empower your team, and drive growth together. 💼 As a fractional CTO and technology consultant for 15 years, I have propelled 3 startups to funding or acquisition and delivered strategic leadership to 20+ clients. My focus is to align product vision and technology, build efficient, high-performing teams, and ensure timely, top-quality results. I provide strategic leadership: 🚀 Shape high-level technology and innovation strategy 🤖 Integrate AI to streamline all areas of the business 🎯 Align technical solutions with strategic business goals ✨ Spearhead digital and AI transformation initiatives ⚙️ Automate business processes to maximize efficiency 👨‍🏫 Coach technical leaders and empower high-performing teams 🔄 Champion lean and agile methodologies for rapid iteration 🤝 Manage global teams and strategic vendor partnerships 🛡️ Ensure robust security, compliance, and due diligence 📈 Optimize team tools and workflows for enhanced productivity 🌐 Bridge cultural gaps for seamless global collaboration I drive forward product development: 🗓️ Define comprehensive product strategy, budget, and timelines 🗣️ Gather stakeholder & UI/UX insights for user-centric products 🏗️ Architect scalable solutions with optimal technology choices 🚚 Drive product development, delivery and backlog management 📝 Translate requirements into actionable technical specifications 🔧 Guide engineering teams to overcome complex technical challenges ✅ Establish robust QA strategies for superior product quality 🏆 My client's products, developed under my guidance, have won industry-awards across America, Europe, and Asia.

I'm a software developer who not only knows how to code but also has a keen eye for design. If it's not pixel-perfect, it's not done. I started programming at the age of 12 when I created my first websites in middle school. I remember when the iPod Touch was first introduced in The Netherlands - I immediately knew that I had to do something with it. And when iPhoneOS 3 with the AppStore was launched, I wasted no time and downloaded Xcode right away to start learning how to develop for it. When I'm not building (web) apps, you can find me pursuing my other passions. I'm an avid runner, love to boulder, and enjoy strumming on my guitar.

𝐄𝐱𝐩𝐞𝐫𝐭-𝐕𝐞𝐭𝐭𝐞𝐝: 𝐓𝐨𝐩 𝟏% 𝐢𝐧 𝐀𝐈-𝐃𝐫𝐢𝐯𝐞𝐧 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬, 𝐌𝐨𝐛𝐢𝐥𝐞, 𝐚𝐧𝐝 𝐖𝐞𝐛 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 With over 19 years of experience as a full-stack software engineer, I specialize in integrating AI-driven solutions, automating complex systems, and delivering robust mobile and web applications. My journey as a technology leader includes launching over 50 applications through my dev shop, Materialize Labs, and serving as CTO for multiple startups. I currently sit on the board and advise emerging companies, leveraging my expertise to foster innovation and growth. 𝐊𝐞𝐲 𝐒𝐤𝐢𝐥𝐥𝐬 & 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 • 𝐀𝐈 & 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧: Expert in AI integration, including OpenAI, Anthropic, and cutting-edge open-source models like Llama and Mistral. Skilled in developing AI-driven automation systems to enhance productivity and decision-making. • 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Proficient in building robust, scalable web and mobile applications. Experienced with front-end technologies like React, Next.js, and Vue and back-end frameworks such as Node.js, PHP (Laravel), and Python (Django). • 𝐌𝐨𝐛𝐢𝐥𝐞 & 𝐂𝐥𝐨𝐮𝐝 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬: Skilled in mobile app development using React Native, Swift, and Kotlin. Experienced with cloud infrastructure on AWS, DigitalOcean, and GCP for seamless deployment and scalability. • 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: Expertise in DevOps practices, ensuring efficient CI/CD pipelines and infrastructure management. Proficient with SQL, NoSQL, and DynamoDB to support data-driven applications. 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐈 𝐔𝐬𝐞 • 𝐀𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: OpenAI, Anthropic, Google, Open-source (Llama, Mistral) • 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: React, Next.js, Vue • 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: Node.js, PHP (Laravel), Python (Django) • 𝐌𝐨𝐛𝐢𝐥𝐞: React Native, Swift, Kotlin • 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: SQL, NoSQL, DynamoDB • 𝐃𝐞𝐯𝐎𝐩𝐬: AWS, DigitalOcean, GCP, Azure 𝐏𝐫𝐨𝐟𝐞𝐬𝐬𝐢𝐨𝐧𝐚𝐥 𝐀𝐩𝐩𝐫𝐨𝐚𝐜𝐡 • 𝐈𝐧𝐧𝐨𝐯𝐚𝐭𝐢𝐨𝐧 & 𝐋𝐞𝐚𝐝𝐞𝐫𝐬𝐡𝐢𝐩: As a seasoned engineer, I lead with innovation and a commitment to delivering quality solutions. My approach is rooted in strategic planning and agile methodologies to ensure successful project outcomes. • 𝐂𝐨𝐥𝐥𝐚𝐛𝐨𝐫𝐚𝐭𝐢𝐨𝐧 & 𝐂𝐨𝐦𝐦𝐮𝐧𝐢𝐜𝐚𝐭𝐢𝐨𝐧: I prioritize clear, responsive communication and collaborative partnerships, ensuring that your vision is realized with precision and excellence. • 𝐂𝐨𝐧𝐭𝐢𝐧𝐮𝐨𝐮𝐬 𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠: Passionate about lifelong learning, I continuously refine my skills and stay abreast of the latest technological advancements to bring the best solutions to your projects. Let’s collaborate to transform your ideas into powerful applications, whether they be AI-enabled, mobile, or web-based, that stand out in the industry. Together, we’ll leverage cutting-edge technology to drive your success.

With over a decade of experience in building end-to-end digital solutions, I help businesses and entrepreneurs turn ideas into scalable, revenue-driven products. From AI integrations that streamline operations to full-stack web and mobile apps that deliver seamless user experiences, I bring both technical expertise and business insight to every project. What I Can Deliver: AI Integrations & Automation – OpenAI, LLaMA, LangChain, and API-driven AI workflows to power chatbots, predictive analytics, and process automation. AI Agent Development – Intelligent, task-driven agents for customer service, data analysis, sales, and marketing. Full-Stack Web Apps – Robust, scalable applications using React, Next.js, Node.js, Laravel, and other modern frameworks. Mobile App Development – Native & cross-platform apps (iOS, Android, React Native, Flutter) with performance-optimised architecture. End-to-End Product Build – From concept to deployment, including UI/UX, backend systems, cloud infrastructure, and API integrations. Why Work With Me? ✅ Proven track record delivering high-impact solutions for clients worldwide ✅ Strong understanding of both technology and business outcomes ✅ Transparent communication & on-time delivery ✅ Focus on scalability, security, and long-term growth If you’re ready to bring AI into your business or launch a powerful digital product, let’s connect and build something extraordinary.

I build, rescue, and scale digital products. As an AI and Software Engineer, I focus on turning complex ideas into cleanly architected, production-ready applications. What I Do: • AI Engineering & Agents: Building custom, production-grade AI agents from the ground up. • Project Rescue: Taking over 'vibe-coded' or immature prototypes and restructuring them into stable, cross-platform applications. • Product Architecture: Setting the right development path and infrastructure for long-term scalability. • Branding & Marketing Design: Crafting the visual identity, promotional assets, and marketing base for your project (AI-integrated or traditional). I am highly adaptable and always exploring the next frontier of tech, welcoming new challenges in Robotics, Blockchain, Fintech, and Embedded Software Engineering. Let's build something that lasts.

Mobile / Fullstack Engineer with 5+ years of experience building production Flutter applications and AI-powered systems. Strong background in Flutter, Firebase, and Google Cloud, including RAG pipelines and Vertex AI agents.

I help companies build high-performance iOS applications focused on video streaming, scalability, and modern SwiftUI architecture. Specialized in AVPlayer, IPTV platforms, large-scale media apps, and AI-powered mobile experiences. My expertise spans the entire software development lifecycle and I excel in leveraging Swift, Objective-C, and various design patterns to deliver high-quality products. I have a proven track record of collaborating with cross-functional teams to enhance processes, ensuring timely and successful project completion. My background in Agile methodologies enables me to adapt quickly to changing requirements while maintaining focus on innovation. By utilizing tools like Google Analytics and Firebase, I optimize app performance and user engagement. If you need a strategic thinker who can turn complex challenges into effective software solutions, let's discuss how I can contribute to your project.

I am a seasoned Senior Software Engineer with over 10 years of hands-on experience in the technology industry. My specialism is Javascript/Typescript and Python fullstack or backend, but I have a lot of experience in other tech stacks too. I excel in designing, building, and maintaining robust software solutions. I'd love to work with you on your project, so please feel free to get in touch

As the creator of Swiftify, a leading product for Apple developers, I have experience with all aspects of the product development lifecycle. I have been working on a SaaS website, mobile and desktop apps, and integrations with external systems. I am particularly interested in these types of projects: - iOS and macOS apps (iPhone, iPad, Apple Watch, Apple Vision Pro) - Backend development using .NET Core, ASP.NET MVC, and WCF - Plugins for web browsers, Microsoft Office applications, IDEs - Language parsers and transpilers based on ANTLR In addition to building my startup, I have also had a variety of roles, from freelance software development to building a software company. I pay great attention to detail and write very well-structured and documented code. I am comfortable working solo, as part of a team, or managing a team of developers. CV: t.ly/94At8

𝐀𝐫𝐞 𝐲𝐨𝐮 𝐥𝐨𝐨𝐤𝐢𝐧𝐠 𝐟𝐨𝐫 𝐚 𝐫𝐞𝐥𝐢𝐚𝐛𝐥𝐞 𝐭𝐞𝐜𝐡 𝐩𝐚𝐫𝐭𝐧𝐞𝐫 𝐭𝐨 𝐛𝐮𝐢𝐥𝐝 𝐚 𝐪𝐮𝐚𝐥𝐢𝐭𝐲 𝐚𝐩𝐩 𝐭𝐡𝐚𝐭 𝐬𝐨𝐥𝐯𝐞𝐬 𝐛𝐮𝐬𝐢𝐧𝐞𝐬𝐬 𝐛𝐨𝐭𝐭𝐥𝐞𝐧𝐞𝐜𝐤𝐬 𝐨𝐫 𝐥𝐚𝐮𝐧𝐜𝐡𝐞𝐬 𝐧𝐞𝐰 𝐯𝐞𝐧𝐭𝐮𝐫𝐞𝐬? How I Can Help You Succeed: - Full-Service Development: From initial concept to fully functional apps, I handle the complete development of mobile and web applications with a focus on delivering tangible results. - UI/UX Expertise: I offer intuitive design, app branding, and product workshops to ensure your app is not only functional but also visually appealing and user-friendly. - Long-Term Support: I build scalable apps, maintain them, and provide ongoing support to adapt to your business needs as they grow. - Cloud Solutions: Seamless integration with cloud infrastructure for performance, scalability, and reliability. How I Can Apply My Experience to Help You: Thanks to the success of my past apps, I became an Implementation Partner of RevenueCat (revenuecat.com) in 2022—a leading platform processing over $5 billion annually and powering 30,000+ apps worldwide. This partnership allowed me to work on apps with thousands of users and significant revenue, equipping me with valuable insights. I’d love to share what I’ve learned with you. Growth Results: - Helped clients generate over $2M annually by integrating RevenueCat. - Grew a client’s app revenue to $280K/year using Stripe. Services - UI/UX design, product workshops, app branding - iOS and Android app development - Web app development: frontend and backend - Maintenance, new feature development Your success is my focus, not just for the initial project but for the long term. Next Steps: Invite me to your project or message me now to discuss your ideas further. I’m offering a FREE strategy consultation call, where you’ll receive: ☝ Expert feedback on your project from an app payments specialist. ✌ Practical advice on development and app growth strategies. ✋ A rough estimate of project costs and timelines. ★★★★★ “It's rare to find somebody with deep knowledge about development, UX design and marketing of mobile apps. Marcin took the time to answer all of my questions and address my concerns. Amazing consultation!” - Viktoriya M. (viktoriyamart) I’m happy to share my expertise and explore how we can collaborate effectively. Contact me today to get started!