Roman Buhyna

Roman Byhuna Senior Software Engineer About me Senior Software Engineer with over 6 years of experience designing and delivering scalable web applications, backend systems, and AI-powered platforms across diverse industries. Highly proficient in full-stack development using modern frameworks such as Angular, React, Vue.js, Next.js, and backend technologies including Node.js, ASP.NET Core, .NET, Python (Flask/FastAPI/Django), Laravel, Ruby on Rails, Go, and Java. Adept in building secure and high-performance APIs using REST and GraphQL, and managing complex data systems with PostgreSQL, MySQL, MongoDB, and Redis. Specialized in integrating advanced AI/ML solutions, including LLMs (OpenAI, Anthropic), natural language processing (NLP), object detection, and predictive analytics to drive user engagement and automation. Experience Senior Software Engineer | Freelance / Remote January 2020 – 2024 Developed 10+ modern web applications using Angular, React (with Redux & Hooks), and Vue.js for startups and SMEs, improving UX and client retention by up to 40%. Architected scalable backends with Node.js, Laravel, and Go, implementing RESTful APIs and microservices used by 100K+ users. Built full-stack AI-driven platforms using Python (Flask/FastAPI) and integrated ML models for real-time predictions, NLP, and object recognition. Designed and deployed decentralized Web3 applications, integrating Ethereum smart contracts (Solidity) and blockchain APIs for secure, transparent business processes. Led the design and deployment of crossplatform solutions with Docker, Kubernetes, and AWS, maintaining 99.9% uptime for client systems. Integrated CI/CD pipelines (GitHub Actions, GitLab CI) and improved DevOps workflow efficiency by 30%. Software Developer | Web & Backend Engineer January 2017 – December 2019 Delivered 20+ production-grade applications using Laravel, Ruby on Rails, and Node.js with frontend stacks like Vue.js and Next.js. Enhanced web performance by 25% by optimizing state management and component structure in React applications. Built multilingual e-commerce platforms for Greek retailers, integrating Stripe, PayPal, and custom order tracking systems. Designed custom admin dashboards with Angular, improving business decision-making via real-time analytics. Developed and audited smart contracts for blockchain-based projects, ensuring security and reliability for DeFi and NFT platforms. Trained junior developers in modern JS frameworks and version control best practices (Git), contributing to team growth and quality delivery. Skills Programming Languages: JavaScript, PHP, TypeScript, Python, Go, Ruby, SQL, C# Frontend Frameworks: React , Angular, Next, Vue, Tailwend.CSS Backend Frameworks: Node, Laravel, Ruby on Rails, Flask, Django, ASP.NET Core, .NET Core, AstAPI. Databases: PostgreSQL, MySQL, MongoDB, Redis DevOps & Cloud: Docker, AWS, GitHub Actions, GitLab CI/CD, Azure. API Design: RESTful APIs, GraphQL, SOAP, Third-party integrations AI/ML Integration: Natural Language Processing (chatbots, sentiment analysis), Object Detection, Predictive Analytics Tools & Platforms: Git, JIRA, Jenkins, Nginx Education Aristotle University Thessaloniki, Greece of Bachelor of Journalism in Science