Mikola Parfenyuck

Senior Full-Stack Engineer | AI Integration | Cloud Architecture

Lviv, Ukraine • Currently at Livegistics

What I can do for your team:

• Ship full-stack features independently from day one
• Design complex database architectures and keep data integrity across messy real-world integrations
• Take AI/ML from idea to production - not demos, but systems people rely on daily
• Build secure, compliant infrastructure (SOC 2)
• Multiply output with AI-assisted, spec-driven development backed by serious testing

Let's talk: mikola.parfenyuck@gmail.com • GitHub • LinkedIn

Summary

Senior Full-Stack Engineer with 10+ years shipping production systems, at Livegistics since 2021. I own features end-to-end - from database schema through frontend to cloud deployment - and thrive where quality and velocity both matter. Ph.D. candidate researching contextual dialogue generation with neural networks - I study the technology I ship.

Skills

Front-end: TypeScript, React, Next.js, Radix UI, Tailwind CSS, React Query, Mobx, Redux, Material UI, Styled Components

Back-end: Node.js, Python, Express, TSOA, Swagger, Prisma, PostgreSQL, MongoDB, Redis, Firestore, Ory (authentication)

DevOps & Cloud: Docker, Google Cloud Platform (GCP), Cloud Run, Kubernetes, SOC 2 compliance

AI & ML: LLM integration (Gemini, Vertex AI), document/ticket data extraction with human-in-the-loop review, AI-assisted engineering (agents, spec-driven development), neural networks, data science

Other: automated testing (unit, e2e, UI), GIS, UX/UI, responsive web design, English (C2 by EFSET)

Jobs

Livegistics - (Sep 2021 - present) Senior Full-Stack Developer

Full-stack development across the entire logistics platform ecosystem. Key work:

• AI Document Extraction: Architected and shipped the production pipeline end-to-end - drivers photograph paper tickets, the system extracts structured fields, humans review only edge cases. Built on Gemini and Vertex AI with a provider-agnostic design; owned the pipeline architecture, model and prompt engineering, and the review UI
• Database Architecture & Data Integrity: Designed complex Prisma/PostgreSQL schemas across multiple business domains; maintain integrity for data flowing between our platform and customers' enterprise systems, from modern APIs to legacy Microsoft-era stacks
• Security & Compliance: Own the engineering side of SOC 2 - infrastructure configuration, monitoring, access control - plus Ory authentication across web and mobile
• Cloud Infrastructure: Built and maintain GCP infrastructure with Docker, Cloud Run, and Kubernetes
• Engineering Workflow: Ship features rapidly using spec-driven development with AI agents, with quality held by comprehensive automated testing (unit, e2e, UI) and code review
• Modern UI: Frontend modernization with Radix UI, Tailwind CSS, and React Query; React Native applications with shared business logic
• Full Ownership: Features go from database schema to frontend to deployment through my hands, end to end

Tech stack: TypeScript, React, React Native, Radix UI, Tailwind CSS, React Query, Redux, Mobx, Material UI, Express.js, TSOA, Swagger, Prisma, Ory, Gemini, Vertex AI, Docker, GCP, Cloud Run, Kubernetes, Ansible, Grafana, Jest, PostgreSQL, Firestore, Redis.

EOS Data Analytics - (Jul 2020 - Aug 2023) Software Developer and Computer Vision Scientist

Research and production development of computer vision systems for satellite imagery analysis. Built ML pipelines for geospatial data processing and analysis tools for earth observation applications.

Tech stack: Python, PyTorch, NumPy, Pandas, TensorFlow, QGIS, React, TypeScript, MongoDB.

Ultimatefintech - (Mar 2019 - Jan 2021) Lead Front-End Developer

Led frontend development for multiple high-profile projects including Virtual Vision virtual event platform and iFX EXPO International 2020. Architected and built complex interactive experiences with 3D scenes, real-time features, and responsive design.

Tech stack: TypeScript, React, Next.js, Vue.js, Nuxt.js, Mobx.

Freelance - (Dec 2015 - Sep 2021) Full-Stack Developer

Delivered complete web solutions for diverse clients across multiple industries. Built full-stack applications, APIs, and database systems while managing client relationships and project timelines.

Tech stack: JavaScript, TypeScript, React, Angular.js, MySQL, PostgreSQL, MongoDB.

Education

• 2020-present - The National University of Water and Environmental Engineering, specialty: Computer Science, Ph.D. candidate. Dissertation research: contextual dialogue generation using neural networks
• 2018-2020 - The National University of Water and Environmental Engineering, specialty: Applied Mathematics, Master's degree
• 2015-2018 - The National University of Water and Environmental Engineering, specialty: Applied Mathematics, Bachelor's degree
• 2012-2015 - Technical College NUWM, specialty: Applied Mathematics

Open Source & Community Impact

osm2geojson - Python library for parsing OpenStreetMap and Overpass JSON data. Used by developers worldwide for geospatial data processing. View on GitHub →

gulp-bootstrap-configurator - Gulp plugin for custom Bootstrap builds, simplifying frontend tooling. View on GitHub →

Featured Work & Case Studies

Livegistics: Enterprise Logistics Platform

A comprehensive logistics management platform handling complex workflows, sensitive data, and enterprise compliance requirements - web and mobile. My main work since 2021 and the home of everything described in the job section above: the AI ticket extraction pipeline, the SOC 2 infrastructure, and the data architecture modeling shipments, carriers, customers, and billing.
Visit website

Stand For Ukraine: Humanitarian Aid Platform

The Mission: Built during Russia's invasion of Ukraine to connect international donors with verified Ukrainian NPOs providing humanitarian aid.

Impact: Architected and developed a bilingual platform aggregating vetted organizations, making it easier for people worldwide to support Ukraine effectively. Deployed quickly under urgent circumstances while maintaining code quality and user experience.

Tech Stack: Next.js, React, TypeScript, Styled Components
Visit website Source on GitHub

Virtual Event Platform with 3D Environments

The Challenge: Create an immersive virtual event platform with 3D environments, real-time chat, video streaming, and notifications.

My Role: Architected and built the entire frontend platform, implementing complex state management with MobX State Tree, 3D scene rendering with Three.js, real-time communication features, and form handling. Delivered a performant, engaging experience for virtual conference attendees.

Tech Stack: Next.js, React, TypeScript, Mobx (mobx-state-tree), Three.js, React Hook Form

Virtual Vision landing page

Development and optimization for mobile devices.
Used: Next.js, React, TypeScript.

iFX EXPO International 2020 website

Full website redesign and codebase refactoring. Addressed various business challenges, added custom floor plan (interactive map), complex registration, and much more.
Used: Nuxt.js, Vue.js, SCSS.
The website is no longer online. The link was https://ifxexpo.com/cyprus2020/.

How I Work

Communication: C2-level English proficiency. I explain complex technical decisions clearly, write documentation people actually use, and collaborate effectively across time zones.

Adaptability: Unfamiliar codebase, new technology, or context-switching between backend, frontend, and infrastructure - I navigate complexity systematically.

Steady: Responsible, calm, and consistent. I show up, do good work, and make the team better.

Beyond Work

When I'm not building production systems, you'll find me:

• Exploring geospatial data analysis and GIS technologies
• Studying neural network architectures and ML papers
• Creating philosophy and tech memes (seriously, check the about page)
• Supporting Ukraine and open-source communities

Get in Touch

I'm always interested in connecting with startups solving hard problems. Whether you're scaling a platform, building AI-powered products, or wrestling complex data - let's talk.

Email: mikola.parfenyuck@gmail.com
LinkedIn: linkedin.com/in/mikola-parfenyuck
GitHub: github.com/rapkin
Blog: rapkin.com.ua (you're here!)

Remote from Lviv, Ukraine, with regular US time-zone overlap • Open to senior, staff, or lead roles • Full-time or contract • US & EU startups welcome