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I’m a senior Python/FastAPI, full-stack, and mobile engineer with 10+ years of production experience, 100% Job Success, 12,432 Upwork hours, 53 completed jobs, and $400K+ earned, all verifiable on this profile. My current focus is building AI-powered SaaS products and backend systems with Python, FastAPI, PostgreSQL, OpenAI, Pinecone, Docker, React, Next.js, and TypeScript. I started my career shipping production web and mobile apps. That means I do not treat AI as just an API call. I build the full product around it: backend architecture, authentication, database design, billing, API integrations, validation, search, deployment, and maintainable code. What I build: - Python/FastAPI backends: REST APIs, PostgreSQL/SQLite, background jobs, auth, Docker, tests, and documentation - AI applications: OpenAI/Anthropic integrations, embeddings, RAG pipelines, Pinecone, structured outputs, and source-cited Q&A - Full-stack SaaS: React, Next.js, TypeScript, Tailwind, Supabase, Stripe, admin dashboards, and multi-tenant systems - Internal tools and automation: business workflows, data processing, API integrations, reporting, and AI-assisted operations - Mobile apps: native iOS with Swift, SwiftUI, UIKit, and Firebase, plus React Native/Expo for iOS and Android Recent work: - Umen: a private portfolio SaaS for internal company knowledge. Teams upload Markdown or text documents, edit and approve them, then use them as a reliable source of truth. Built with FastAPI, PostgreSQL/SQLite, React/TypeScript, Docker, tests, and documentation. It supports OpenAI + Pinecone source-cited AI Q&A when configured. A demo or code sample is available on request. - Tailored AI: AI newsletter SaaS built and operated solo. Users configure topics, tone, and frequency; the system retrieves news, summarizes it with OpenAI, and sends newsletters automatically. Includes Stripe subscriptions, Supabase RLS, scheduled workflows, and an admin dashboard. - CircleMate: relationship-analysis platform with CSV ingestion, custom scoring logic, authentication, multi-tenant data handling, and Row-Level Security. Mobile experience: - Eindhoven Airport Burenapp: native iOS application built with Swift, SwiftUI, and Firebase. - MyWorldNavigator: iOS and Android navigation application. - Dr. McDougall Mobile Cookbook: production iOS and Android application. - Additional shipped mobile products include Zapptales, Elis Leads, Butlers App, CoronaTjek Hjemmetest, FoodDiscovery, Dood, Sports Stats Limited apps, and Sounds True. I completed DataCamp’s Associate Python Developer learning track, covering Python fundamentals, functions, modules and packages, iterators, list comprehensions, data types, dates and times, regular expressions, object-oriented programming, and Unix shell fundamentals. I have also completed DataCamp courses in Introduction to Embeddings with the OpenAI API and Developing AI Systems with the OpenAI API. How I work: I’m based in Slovenia, CET, with up to 6-7 hours of daily overlap with US Eastern when needed. You can expect clear communication, realistic estimates before coding starts, and regular updates on what shipped, what is blocked, and what is next. I’m a strong fit if you need someone to build a Python/FastAPI backend, AI SaaS, internal AI tool, RAG system, automation platform, or full-stack product that needs to be production-ready rather than just a demo. Send me the details and I’ll tell you honestly whether I’m the right person and how I’d approach it.

Python Developer | Web Scraping, Automation, Telegram Bots, API Integrations I help businesses automate repetitive work, extract valuable data, and build reliable Python tools around real operational needs. ⚙️ My core expertise is in web scraping, browser automation, Telegram bots, API integrations, and workflow automation. I build systems that reduce manual work, connect disconnected processes, and produce clean, usable outputs. I work on projects such as: custom web scrapers for marketplaces, e-commerce sites, and business platforms automation tools for repetitive workflows and reporting Telegram bots for funnels, alerts, admin actions, and internal operations API integrations between websites, spreadsheets, and third party services data processing pipelines and tracking systems 📊 Why clients work with me: fast understanding of the task practical and reliable solutions clean outputs and maintainable code clear communication and quick iteration 🚀 Main stack: Python, Playwright, Selenium, BeautifulSoup, Scrapy, FastAPI, Aiogram, asyncio, PostgreSQL, SQLite, MongoDB, REST APIs, Google Sheets integrations If you need a developer who can turn a manual process into a working automation system, I’m ready to help.

I have over 15 years of experience in IT, starting my career as a software engineer and gradually transitioning into the field of data and artificial intelligence. Currently, my focus is on AI, machine learning, and intelligent systems, where engineering thinking is combined with a strong analytical approach. I have experience in developing complex systems, working with data, and building NLP and LLM-based solutions. Since 2017, I have been engaged in academic research as part of my PhD, focusing on text processing and data analysis. I have worked on AI-driven projects in the healthcare and finance domains, and have also contributed to an international research initiative, Pathogenomics & Biosecurity (University of Alaska Anchorage, Kyiv School of Economics), focused on genomics of emerging viruses, bioinformatics, and epidemiological monitoring systems for infectious diseases Skills & Interests Bioinformatics: Genomics, Metagenomics, RNA-seq, NGS, Sequence Analysis, Genome Annotation, AMR, Phage Biology, Biological Data Pipelines AI / Agents: Claude, OpenAI API, LangGraph, LangChain, Langfuse, LagSmith, Langfuse, AWS Bedrock, Vector DB ML / DL: PyTorch, TensorFlow, Pandas, Predictive Modeling, Regression Models, RAG, CAG, Embeddings Software Engineering: Python, Node.js, TypeScript , React, FastAPI, Django , REST, GraphQL, JWT, Auth0, Keycloak, Kafka, Celery Architecture: Microservices, Event-Driven Systems Databases: PostgreSQL, MongoDB, Redis, Elasticsearch, SQLAlchemy, Alembic, QLDB, Big Query, Dynamo DB, RDS Cloud: AWS, Azure, EC2, RDS, AWS Bedrock, Lex, Docker, LocalStack, Logging: DataDog, Grafana , Prometheus

Full Stack Developer | Angular | NestJS | PHP | PostgreSQL | MySQL | MongoDB Are you looking for a skilled Full Stack Developer to transform your web ideas into reality? With 4 years of hands-on experience, I specialize in building scalable, efficient, and visually engaging web applications. My Expertise: Front-End Development: Proficient in Angular, crafting dynamic single-page applications (SPAs) with responsive, user-friendly designs. Expertise in RxJS, Angular Material, and server-side rendering with Angular Universal to enhance performance and SEO. Back-End Development: Strong command of NestJS, PHP, and API integration to build robust and maintainable back-end architectures. Database Management: Skilled in PostgreSQL, MySQL, and MongoDB, ensuring efficient data storage, seamless flow, and optimized performance. Design & Usability: A keen eye for clean, responsive design and cross-browser compatibility, creating applications that look and perform flawlessly across devices. Why Work With Me? Professional Expertise: Strong knowledge and real-world experience in Angular, NestJS, and full stack development. Detail-Oriented: Deliver high-quality work with a focus on performance, scalability, and maintainability. Collaborative Approach: I work closely with clients to understand their vision and provide tailored solutions. Timely Delivery: Committed to meeting deadlines without compromising quality. Let’s collaborate to bring your vision to life with clean, scalable, and impactful web applications. Work Experience: Full Stack Developer | Ames doo | Jan 2023 - Present Developed and maintained web applications using Angular, PHP API-s and MySql db. Created dynamic and responsive SPAs with Angular, enhancing user experience and application performance. Managed state and data flow using NgRx and RxJS for scalable and maintainable code. Collaborated with designers to implement responsive and user-friendly interfaces using Angular Material. Conducted code reviews and provided mentorship to junior developers on Angular best practices. Implemented server-side rendering with Angular Universal for improved SEO and performance. Full Stack Developer | Uscom doo @ Sledat | Jul 2024 - Present Created dynamic front-end interfaces using Angular and JavaScript. Developed custom Angular components and services to meet client-specific requirements. Integrated RESTful APIs with Angular applications for seamless data flow. Enhanced user experience through the implementation of modern design principles and practices. Participated in agile development cycles, contributing to sprint planning and execution. Cloud Engineer Intern | Lancom doo | Jan 2023 - Jun 2024 Assisted in the deployment and management of cloud-based applications using Microsoft Azure. Utilized Docker for containerizing applications, ensuring consistency across development and production environments. Worked with Kubernetes for container orchestration, automating deployment, scaling, and management of containerized applications. Implemented CI/CD pipelines using Azure DevOps, streamlining the software development lifecycle. Monitored and optimized cloud infrastructure to ensure high availability and performance. Gained hands-on experience in cloud security practices, ensuring secure deployment and operation of applications. Collaborated with senior engineers to troubleshoot and resolve issues related to cloud infrastructure and services.

Hi, thanks for your interest in my skills. Here is, in short, how I can help: - Write clean, testable code using software design patterns such as SOLID, using PHP, JavaScript, and TypeScript, and any framework based on these languages - Do code review and suggest improvements - Refactor and/or upgrade your existing code base to the latest versions and/or improve testability - Design and architect your application based on business requirements - Build/improve CD/CI and developer experience - Organize and write tests Since 2001, I have developed a comprehensive range of applications and systems - from desktop software and web applications to mobile apps and social platforms - serving startup companies, small businesses, and agencies across Serbia, the EU, and the USA. My expertise spans the complete project lifecycle from concept to production, with a strong focus on delivering scalable, maintainable solutions. Core Technical Expertise Backend Development & Frameworks Laravel and Livewire (daily use since 2019) for modern, reactive web applications Extensive Yii framework experience (daily use since 2010) Advanced PHP with strong OOP and DDD principles Node.js and TypeScript for full-stack JavaScript development Emerging proficiency in Rust for performance-critical applications Frontend & JavaScript Ecosystem Advanced JavaScript knowledge across multiple frameworks: Vue.js, Quasar, Alpine.js, and React.js Server-side JavaScript with Node.js, Express.js, Nest.js TailwindCSS Database & Performance Optimization Expert-level MySQL/PostgreSQL/SQLite and RDBMS design and optimization NoSQL experience with MongoDB Caching strategies using Memcached and Redis Database optimization for high-traffic applications Infrastructure & DevOps Cloud infrastructure management on AWS, DigitalOcean, and Hetzner Server provisioning and configuration DevOps automation using Ansible, Vagrant, Docker and Docker Compose Process optimization through automation, wherever possible Professional Approach I write clean, testable code and have extensive experience mentoring junior developers, fostering collaborative and growth-oriented team environments. My problem-solving skills enable me to work effectively both independently — taking projects from initial concept through to production — and as part of larger development teams. I specialize in creating scalable backend systems that can handle high-traffic demands while maintaining code quality and performance. Additionally, I have significant experience with refactoring and upgrading legacy codebases, utilizing tools like Rector for automated code modernization and employing test-driven development approaches to ensure reliability throughout the upgrade process. My approach emphasizes automation to optimize development processes and reduce manual overhead. With over two decades of experience, I'm quick to understand and implement new ideas, adapt to emerging technologies, and deliver solutions that meet both technical requirements and business objectives. I'm available for both project-based work and hourly engagements (tracked via UpWork's time tracker). Feel free to reach out to discuss your project requirements.

Message me today and get a 𝐅𝐑𝐄𝐄 𝟑𝟎‑𝐦𝐢𝐧𝐮𝐭𝐞 strategy session 🔥 Have an idea, MVP, or legacy product that needs to scale? We help startups and enterprises launch scalable mobile apps, SaaS platforms, and custom software without accumulating technical debt. ⚡ Our core strength is .NET and mobile app development. We build iOS and Android apps, high-load backend systems, cloud platforms, and AI-powered products used across Healthcare, FinTech, Education, Retail, Logistics, and Manufacturing. Our core stack: 🔹Mobile: Flutter, React Native, iOS, Android, Swift, Kotlin 🔹Backend & Cloud: .NET Core, .NET Framework, C#, Node.js, GraphQL, RabbitMQ, Kafka, Azure, AWS 🔹Frontend: React, Angular, Vue.js, Svelte, TypeScript 🔹AI/ML: ChatGPT, Llama, TensorFlow, PyTorch, NLP, OCR, Computer Vision 🔹UX/UI: Figma, Sketch, InVision, Zeplin 🔹QA & Automation: Selenium, Cypress, JMeter, Postman, BrowserStack We've delivered solutions for companies in Healthcare, FinTech, Education, Retail, Logistics, and Enterprise SaaS. Need a team that can take ownership from architecture to App Store / production release? Let's talk 🔥