Hire the Best Software Architecture Freelancers
in Serbia

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Ognjen S.

Belgrade, Serbia

$60/hr
5.0
14 jobs

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!

  • Software Architecture & Design
  • AI Development
  • TypeScript
  • JavaScript
  • Node.js
  • React
  • Next.js
  • Docker
  • NestJS
  • Kubernetes
  • PostgreSQL
  • Amazon Web Services
  • Google Cloud Platform
  • Clean Architecture
  • SaaS Development
Veljko M.

Belgrade, Serbia

$54/hr
5.0
12 jobs

Software Architect | Senior .NET + Angular Engineer | Azure Expert I am a Senior Software Engineer and Software Architect with more than 10 years of experience delivering enterprise systems for companies such as SAP, FIS, Arcadis, and Microsoft. I specialize in designing scalable architectures, building high-performance backend systems, and creating modern frontend applications using .NET and Angular. ⭐ Technical Expertise 🔥 Backend & Architecture • C# • .NET Core / .NET Framework • ASP.NET Web API / MVC • SQL Server, T-SQL, Entity Framework, LINQ • Microservices, Clean Architecture, Event-Driven systems • REST APIs, Integrations, Distributed systems • RabbitMQ, Azure Service Bus ⚡ Frontend • Angular 2+ • TypeScript, RxJS • Tailwind, PrimeNG • React (secondary) ☁️ Cloud & DevOps • Azure Functions, APIM, App Service, Storage, Queues • AWS (selected services) • CI/CD: Azure DevOps, GitHub Actions • Docker, Kubernetes 🚀 What I Deliver 💡 Scalable backend architecture 🔐 Secure, fast, clean REST APIs 🏗 Enterprise-grade .NET systems 🧹 Maintainable, production-ready code 🌐 Full-stack development with Angular ☁️ Cloud-based distributed solutions 🕒 On-time delivery & clear communication 🤝 Why Clients Work With Me 🎯 Strong architectural thinking 🧠 Excellent problem-solving skills 💬 Professional communication 🏢 Deep enterprise experience 🔁 Reliable long-term collaboration If you need a Senior .NET & Angular engineer or a Software Architect who can take ownership of your system design and development — let's work together.

  • Software Architecture
  • C#
  • .NET Core
  • ASP.NET Core
  • Web API
  • Microsoft SQL Server
  • Angular
  • TypeScript
  • JavaScript
  • Microsoft Azure
  • Entity Framework
  • Clean Architecture
  • Docker
  • Kubernetes
  • .NET Framework
Aleksandar N.

Belgrade, Serbia

$30/hr
4.3
1 jobs

Software architect with strong analytical skills and knowledge of agile methodologies and practices. Within 25 years experience has been working on system integration, business processes, distributed systems, web and desktop applications, databases, components, frameworks, network services, APIs, platforms, device communications, and enterprise software systems.

  • Microservice
  • Spring Framework
  • JavaScript
  • Java
  • Web Application
  • Agile Software Development
  • Relational Database
  • Automation
  • NoSQL Database
  • Unit Testing
  • Service-Oriented Architecture
  • Software Architecture & Design
  • Software Integration
  • Business Process Management
  • Containerization
Predrag V.

Belgrade, Serbia

$54/hr
4.9
16 jobs

I help companies deliver software projects end-to-end, with a strong record of rescuing and completing stalled or unfinished projects. For you, I can efficiently: • Implement React.js applications (SPA, complex UI, state management, SEO optimization). • Design and implement backend REST services in .NET, Java Spring Boot, NodeJS or PHP. • Secure APIs, integrations, and authentication (OIDC, OAuth2, IdentityServer). • Implement CI/CD pipelines, DevOps practices, and automation. • Set up Docker & Kubernetes environments (Azure, DigitalOcean, on-premises). • Build JIRA add-ons and integrations toward third party systems. • Help with architecture guidance, refactoring, technical leadership. • Take over, stabilize, and deliver half-done or stalled projects. With 20+ years of software development experience and 5+ years as a Solution Architect & Principal Developer, I combine high-level architectural planning with hands-on coding to deliver reliable and maintainable systems. If this sounds like what you're looking for, invite me to your job on Upwork to schedule a FREE discovery call to find out how I can help you with your project.

  • .NET Core
  • C#
  • Java
  • JavaScript
  • TypeScript
  • React
  • Docker
  • Kubernetes
  • Microsoft Azure
  • Microsoft SQL Server
  • MySQL
  • OAuth
  • CI/CD
  • OpenAPI
  • QlikView
Roman B.

Belgrade, Serbia

$950/hr
4.9
80 jobs

From Idea to Production. I deliver complete systems - architecture, backend, infrastructure, automation - as fixed-price projects with concrete deliverables. What I bring: 15+ years of systems engineering (Linux, cloud, DevOps) Full stack coverage: Rust, TypeScript, APIs, databases, cloud infrastructure Deep understanding of automation pipelines and systems design I ship fast. AI tools are part of my workflow. What I don't do: Hourly babysitting. I sell results, not time. UI/UX design. I build systems, not pixels. If you have a concrete problem and need it solved fast and right - let's talk.

  • Software Architecture
  • Linux
  • Amazon Web Services
  • System Administration
  • Node.js
  • MySQL
  • JavaScript
  • DevOps
  • Automation
  • Rust
  • TypeScript
  • Docker
  • PostgreSQL
  • Solution Architecture
  • Artificial Intelligence
  • API Development
  • Kubernetes
Vasil S.

Belgrade, Serbia

$70/hr
5.0
2 jobs

System and Software Architect with over two decades of extensive experience in software development, system architecture, and project management. Have a proven track record of delivering complex and high-impact projects across various industries, including airfreight, trucking, agriculture, and telecommunications.

  • Java
  • PHP
  • Node.js
  • Spring Boot
  • Android
  • Rust
  • Symfony
  • Angular
  • React
  • React Native
  • PostgreSQL
  • MySQL
  • Redis
  • Docker
  • Ansible

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