Roman Buhyna
Senior Software Engineer.
About me.
Senior Software Engineer with 8 years of experience delivering scalable software solutions and
AI-integrated platforms. Proficient in full-stack development using frameworks like React, Vue.js,
Angular, and backend technologies including Python (FastAPI, Django), Node.js, .NET, Go, and
Java. Expert in designing RESTful and GraphQL APIs, optimizing database performance, and
deploying systems to cloud environments. Integrated large language models (OpenAI, Anthropic)
into production systems for NLP and image analysis. Known for improving application
performance, reducing latency, and driving automation. Collaborative and detail-focused, with a
strong track record of cross-functional team leadership and mentorship.
Experience.
Senior Software Engineer
Upwork.com / Freelance (Athens, Attiki, Greece)
Apr 2025 – Present · Remote
Delivered 5+ production-grade web and AI platforms across fintech, healthtech, and
logistics domains.
Migrated legacy systems to microservices architecture using FastAPI and Node.js, cutting
deployment time by 45%.
Integrated GPT-4 and BERT models for chatbot and document processing workflows,
reducing manual handling by 70%.
Increased front-end responsiveness by 60% through optimized React and Vue.js
implementations.
Refactored REST and GraphQL APIs to reduce average response time from 250ms to
90ms.
Trained and supported a team of 3 junior developers, resulting in 40% faster delivery on
client projects.
Senior Software Engineer
Freelancer.com / Freelance (Athens, Attiki, Greece)
Jan 2021 – Dec 2024 · Remote
Developed 10+ full-stack applications using Python (Django, FastAPI) and Node.js with
React and Next.js.
Built real-time notification systems via WebSockets handling over 100,000 daily events.
Deployed AI-powered features using TensorFlow and PyTorch, including a CV pipeline
with 95% object recognition accuracy.
Reduced query latency by 50% through Redis caching and PostgreSQL indexing.
Designed CI/CD pipelines (GitHub Actions, GitLab CI) reducing release times from
weekly to daily.
Saved clients ~30% in infrastructure costs through Docker container optimization and
AWS auto-scaling.
Software Engineer
TechBridge Solutions (Czech Republic / Remote)
Aug 2017 – Dec 2020
Delivered APIs serving 1M+ monthly users using Node.js and Python with strong
authentication and logging.
Spearheaded migration of 3 monolithic services to modular microservices, improving
system resilience by 35%.
Built analytics dashboards in Angular and React, enabling real-time business insights.
Reduced cloud deployment failure rates by 80% with Jenkins pipeline refactor and
enhanced unit tests.
Junior Software Developer
CodeWave Systems (Czech Republic)
May 2016 – Jul 2017
Automated 20+ internal operations using Django/Laravel, saving ~100 hours/month.
Improved security posture by implementing OAuth2 and JWT on web platforms.
Wrote 200+ automated tests using pytest and Jest, increasing code coverage to 85%.
Supported sprint planning, daily standups, and peer reviews in Agile team of 6 engineers.
Skills
Programming
Languages: Python(Flask, FastAPI, Django, TensorFlow, PyTorch),
JavaScript/TypeScript(Node.js, React, Next.js, Angular, Vue.js), Java, C#(.NET, ASP.NET Core),
PHP, Go, Ruby.
AI & Machine Learning: Deep Learning, LLM Integration, NLP, Data Labeling & Preprocessing
Pipelines.
Backend Development: RESTful API & GraphQL Design, API Security(JWT, OAuth2), WebSockets &
Real-time Data Streaming, ETL Pipelines and Data Engineering Workflows.
Frontend Development: React.js/Next.js, Anguar, Vue.js, Bootstrap, Responsive Design with Tailwind.
Databases & Caching: PostgreSQL, MySQL, MongoDB, Redis, Firbase Realtime DB and Firestore,
ElasticSearch.
Others: Docker, AWS, Azure Devops, CI/CD, Git,
🎓 Education
Bachelor’s Degree in Computer Science
Czech Technical University in Prague (CTU) Prague, Czech Republic · Sept 2011 – Jun 2015
🌍 Languages
- English (Fluent), Czech (Native),
