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I'm a senior full-stack engineer with 9+ years of experience delivering production-grade applications in Angular and .NET for clients across travel, maritime, and tax industries. My work spans the full lifecycle — architecture, development, DevOps, and long-term maintenance. Recent engagements include an Angular SSR + .NET platform for a travel/OTA business (resolving memory leaks, bot mitigation, and hydration performance issues), an air-gapped network monitoring system built on .NET 10 and deployed via Docker/WSL, and a multi-tenant venue management SaaS with custom booking logic. Technical expertise: ✅ Angular (all versions), TypeScript, RxJS, Signals/NgRx ✅ .NET Framework through .NET 10, C#, ASP.NET, Web API ✅ SQL Server, MongoDB, Entity Framework ✅ Azure, Docker, CI/CD (GitHub Actions, Azure DevOps) ✅ Application security practices (OWASP, dependency scanning) I've led development teams, mentored engineers, and managed client relationships end-to-end as an independent contractor. I focus on clean architecture, maintainable code, and systems that hold up under real production load. Available for both project-based work and ongoing support engagements. Let's discuss your requirements.

I help founders build, and scale marketplace products, from initial architecture to production deployment. My core expertise is in marketplace systems: role-based access, payments, onboarding flows, messaging, search & filtering, commission logic, and scalable backend infrastructure. Whether you’re launching an MVP or optimizing an existing platform, I focus on building systems that are technically sound and commercially viable. My expertise lies in working with a range of technologies, including Node.js, Express, Koa.js, React.js, Next.js as well as databases such as MongoDB, Redis, and PostgreSQL. I have a solid understanding of these frameworks and databases, allowing me to develop efficient and robust web applications. Throughout my career, I have successfully delivered projects in various industries, including marketplace platforms and fitness platforms catering to gym trainers and their clients. These experiences have honed my ability to understand client needs and develop tailored solutions that drive results. Furthermore, I hold a strong educational background in computer science, which has provided me with a solid foundation in programming principles and problem-solving techniques. I continuously strive to stay up-to-date with the latest trends and best practices in the field to ensure that my work remains cutting-edge and of the highest quality. When you work with me, you can expect professionalism, clear communication, and a commitment to delivering exceptional results. I pride myself on my attention to detail and my ability to work efficiently under tight deadlines. Thank you for taking the time to review my profile. I look forward to the opportunity to collaborate with you on your next project. Feel free to reach out to discuss your specific requirements in more detail.

With 23 years of experience building software, I run Art & Logic d.o.o., a Serbian software consultancy, and have completed 80+ projects on Upwork with a Top Rated track record. My core stack is C# and .NET — from ASP.NET Core down to legacy .NET Framework 4.8 and ASP.NET Web Forms — paired with Angular and React on the frontend, and SQL Server on the backend. I also work with PostgreSQL and MySQL, using Entity Framework (both EF6 and EF Core) and Dapper depending on the project. Recent focus areas include: Azure & AI integration — Azure OpenAI features embedded into web and desktop applications, plus configuring Microsoft Copilot Studio for multi-agent orchestration and connecting AI agents to business data via Snowflake and MCP connectors. Performance & caching — Redis (including Azure Cache for Redis), T-SQL query plan and index tuning, for applications that need to stay fast under load. Payments & real-time communication — Stripe and PayPal integration, WebRTC for video features, and Twilio for SMS/voice. Healthcare software — I built and run a live medical e-directory platform (Angular/.NET), and spent 3 years at Prime Care Technologies, a U.S. healthcare technology company, so I'm comfortable working in HIPAA-regulated environments and handling protected health information. Desktop & on-prem deployment — WinForms/WPF applications, Windows services, and installers (WiX and Advanced Installer) for self-managed customer deployments. On the frontend I also work with Tailwind CSS, SASS/LESS, and modern build tooling (Webpack/NPM). I use Azure DevOps for source control, so changes are always revertible and progress is measurable. I follow consistent coding standards and document my work clearly so any developer who picks up the project after me can understand it. I work exclusively on hourly, pay-per-time engagements — happy to discuss your project in detail before we start, no obligation. Best regards, Srdjan Mladenovic

Are you building a fintech platform, integrating legacy systems, or scaling a .NET backend that needs to handle real load? I can help. I'm a Senior .NET Backend Developer with 4+ years of experience building scalable distributed systems in fintech and enterprise environments. Currently working remotely for a UK-based fintech startup (InvestmentTribe), architecting .NET 8 microservices that handle real-time financial data pipelines with sub-100ms response times on critical endpoints. Previously built the backend for ExamRoom.AI — an AI-powered proctoring platform used by thousands of exam candidates globally, maintaining 80%+ test coverage on core business modules. What I typically help clients with: Building or refactoring .NET microservices (clean architecture, DDD, CQRS) Event-driven systems with RabbitMQ and MassTransit Real-time features with SignalR and WebSockets REST API & gRPC service development with high-performance async patterns SQL Server optimization, stored procedures, AWS Redshift integration JWT, OAuth 2.0, API Key auth implementations XML/SOAP legacy integrations and data pipelines I write clean, testable code and communicate clearly throughout the project. No disappearing acts. Tech: .NET 6/7/8, ASP.NET Core, EF Core, Dapper, gRPC, Docker, GitLab CI/CD, SQL Server, Redis, AWS Redshift

Owner @ CodeAnarchy | Toptal | Arc | Top 1% - Upwork Ex - Lead Software Engineer L2 @ FINcredible GmbH Master's in Computer Software Engineering PhD candidate in Computer Software Engineering (ongoing) Senior Software Engineer with over 8+ years of experience, I specialize in architecting high-performance, scalable systems for the fintech, AI sectors and others. I lead projects from concept to launch, building robust, cloud-native, microservice or monolith based applications with TypeScript, Node.js, and React ecosystem. If you are looking for a developer who just checks boxes, I’m not your guy. I build systems that actually solve the chaos of complex operations. Whether you are scaling a Fintech platform to millions of users or building AI-driven ETL pipelines, I don't just write code—I architect and deliver complete, scalable systems. I have a proven track record of delivering critical business value: - Cut data ingestion time by 85-90% for large-scale enterprise batch operations. - Architected systems to handle millions of monthly users with high availability. - Led development of a core fintech platform integrating with 100+ major EU banks via PSD2 and XS2A standards. Transforming complex requirements into intuitive, high performance web applications. AWS Certified Developer - Associate My underlying expertise: Architecture: System Design, System Architecture, Microservices, Event-Driven Systems, Fintech Systems, PSD2/XS2A, Domain Driven Design, Domain Modeling, 3DS Backend: Node.js (NestJS, Express, Fastify), TypeScript, PostgreSQL, MySQL, DynamoDB, Payments, Supabase, Prisma, Twilio, Resend, Redis Frontend: React (Next.js, Remix), TypeScript, JavaScript, PWA Cloud & DevOps: AWS (Certified Developer), GCP, Terraform, Kubernetes, Docker, GitHub Actions, GitLab CICD, Vercel, Cloudflare AI: AI-Driven Workflows, Vercel AI, Google Generative AI & Vertex, Hugging Face Models, Modal, Trigger.dev, Inngest, N8N, Deepgram, LangGraph TypeScript and JavaScript wizard / addict. 👋 Let's discuss how I can architect and build your next-gen platform. Send me a message to schedule an initial consultation. I'm always available for a coffee chat, whatever the reason. 🤝 Please feel free to send a message so we can have a chat over a cup of coffee!

Web Scraping is a headache. I can help you forget about it. 𝐈 𝐫𝐮𝐧 𝐚 𝐖𝐞𝐛 𝐒𝐜𝐫𝐚𝐩𝐢𝐧𝐠 𝐜𝐨𝐦𝐩𝐚𝐧𝐲, 𝐰𝐞 𝐰𝐨𝐫𝐤 𝐨𝐧 𝐥𝐚𝐫𝐠𝐞 𝐝𝐚𝐭𝐚 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬. 𝐌𝐲 𝐛𝐚𝐭𝐭𝐥𝐞 𝐭𝐞𝐬𝐭𝐞𝐝 𝐭𝐞𝐚𝐦 𝐜𝐚𝐧 𝐝𝐞𝐯𝐞𝐥𝐨𝐩 𝐚𝐧𝐝 𝐦𝐚𝐢𝐧𝐭𝐚𝐢𝐧 𝐚𝐧 𝐞𝐧𝐝-𝐭𝐨-𝐞𝐧𝐝 𝐰𝐞𝐛 𝐬𝐜𝐫𝐚𝐩𝐢𝐧𝐠 𝐩𝐫𝐨𝐣𝐞𝐜𝐭. 🏆 𝐓𝐨𝐩-𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬 𝐟𝐨𝐫 4 𝐲𝐞𝐚𝐫𝐬 ✅ 𝟏𝟓𝟎𝟎+ 𝐰𝐞𝐛𝐬𝐢𝐭𝐞𝐬 𝐬𝐜𝐫𝐚𝐩𝐞𝐝, 𝟑𝟎𝟎𝟎+ 𝐡𝐨𝐮𝐫𝐬 𝐰𝐨𝐫𝐤𝐞𝐝 ✅ 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 𝐰𝐢𝐭𝐡 𝐥𝐚𝐫𝐠𝐞𝐬𝐭 𝐰𝐞𝐛𝐬𝐢𝐭𝐞𝐬 (𝐀𝐦𝐚𝐳𝐨𝐧, 𝐖𝐚𝐥𝐦𝐚𝐫𝐭, 𝐌𝐞𝐫𝐜𝐚𝐝𝐨 𝐋𝐢𝐛𝐫𝐞, 𝐙𝐢𝐥𝐥𝐨𝐰, 𝐈𝐧𝐝𝐞𝐞𝐝, 𝐘𝐞𝐥𝐩) ✅ 𝐖𝐞 𝐜𝐚𝐧 𝐛𝐲𝐩𝐚𝐬𝐬 𝐚𝐧𝐲 𝐚𝐧𝐭𝐢-𝐛𝐨𝐭 𝐬𝐲𝐬𝐭𝐞𝐦: 𝐂𝐥𝐨𝐮𝐝𝐅𝐥𝐚𝐫𝐞, 𝐀𝐤𝐚𝐦𝐚𝐢, 𝐏𝐞𝐫𝐢𝐦𝐞𝐭𝐞𝐫𝐗, 𝐃𝐚𝐭𝐚𝐃𝐨𝐦𝐞 ✅ 𝐖𝐞 𝐡𝐚𝐯𝐞 𝟐 𝐭𝐞𝐚𝐦𝐬 𝐨𝐟 𝐰𝐞𝐛 𝐬𝐜𝐫𝐚𝐩𝐞𝐫𝐬 𝐰𝐢𝐭𝐡 𝐢𝐧𝐭𝐞𝐫𝐧𝐚𝐥 𝐦𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭 🟢𝙒𝙃𝘼𝙏 𝙒𝙀 𝘾𝘼𝙉 𝘿𝙊 𝙁𝙊𝙍 𝙔𝙊𝙐: 🔸 Monitor prices & availability on 250 ecommerce websites 🔸 Take over an existing web scraping project within 5 business days 🔸 Provide long-term project support & maintenance 🔸 Large scale distributed projects (download 100TB of podcast audio within a week? No problem!) 🔸 Bypass any anti-bot system 🟢𝙔𝙊𝙐 𝙉𝙀𝙀𝘿 𝙈𝙀, 𝙄𝙁: 🔸 your AI startup needs a large, clean dataset ASAP 🔸 you have a large web scraping project and it's driving you mad 🔸 you need to support a legacy web scraping project 🔸 you want a lot of data in a short amount of time 🟢𝙔𝙊𝙐𝙍 𝘽𝙀𝙉𝙀𝙁𝙄𝙏𝙎 𝙊𝙁 𝙒𝙊𝙍𝙆𝙄𝙉𝙂 𝙒𝙄𝙏𝙃 𝙈𝙀: 🔸 We’ve worked on 60+ web scraping projects 🔸 I have my own production-ready infrastructure 🔸 I have multiple web scraping experts available on short notice 🔸 Relevant project-related suggestions 🕷️𝗠𝗬 𝗪𝗘𝗕 𝗦𝗖𝗥𝗔𝗣𝗜𝗡𝗚 𝗧𝗘𝗖𝗛-𝗦𝗧𝗔𝗖𝗞🕷️ Python, Scrapy, Selenium, PostgreSQL, Redis I can use beautifulsoup (bs4), requests, httpx, scrapydweb, scrapyd, manage proxy pool and solve captchas 🕸️𝗦𝗔𝗠𝗣𝗟𝗘 𝗪𝗘𝗕 𝗦𝗖𝗥𝗔𝗣𝗜𝗡𝗚 𝗣𝗥𝗢𝗝𝗘𝗖𝗧𝗦 🕸️ Monitor prices (weekly) on 250 ecommerce domains Monitor prices (daily) of 100k products on Amazon for 6 months Monitor publications on 300 government websites + collect historical data Download 6M PDFs from 120 websites Download 3M podcasts (100TB) from apple podcasts Monitor the entire Zillow.com (42.000 US zip codes) daily