# Mykola D Mykola D is a remote worker on Himalayas, Senior Full Stack Engineer at Military Tech, based in Ukraine. Source: https://himalayas.app/@mykolad ```text Senior Full Stack Engineer, 10+ years: Python, Django, FastAPI, React, TypeScript. Real-time DefTech, PostGIS, LLM/RAG integrations. ``` | Detail | Value | | --- | --- | | Availability | Looking for a job | | Location | Ukraine | | Authorized to work in | Ukraine | | Salary expectations | 60k+ USD | | Job categories | Full Stack Engineer, Python Software Engineer, Front End Developer, Software Engineer | | Skills | Fullstack Development, Python, Django, fastAPI, React, TypeScript, Backend Development, REST APIs, Django REST Framework, Asynchronous Programming, Real Time Systems, MQTT, WebSockets, Protocol Buffers, Computer Vision | | Website | https://agentpatterns.tech | | LinkedIn | https://linkedin.com/in/nickdemianov | | GitHub | https://github.com/mykolademyanov | ## About ```text Senior Full Stack Engineer with 10+ years of hands-on experience building production web products. Main stack: Django and FastAPI on the backend, React, Next.js and TypeScript on the frontend, PostgreSQL, PostGIS, MongoDB and Redis underneath. I work across the whole product: data models, APIs, interfaces, integrations, tests, deployment and production support. Current project: a real-time DefTech system with Python services, React interfaces, MQTT, Protocol Buffers, WebSockets, maps and video streams, including beamforming and NPU-accelerated computer vision on Orange Pi hardware. Earlier: energy metering and billing, real estate, fleet management, IoT, music and mobile products (a React Native + PostGIS app on the App Store and Google Play). AI work: LLM API integrations (OpenAI, Anthropic, Gemini), RAG, agent workflows with LangChain and LangGraph. I built OnceOnly (Python SDK on PyPI, TypeScript SDK) and AgentPatterns. Delivery when needed: Docker, Nginx, Jenkins, CI/CD, AWS and GCP. Upwork: 100% Job Success, 15 completed jobs, 2,400+ hours. Looking for a hands-on senior individual-contributor role, remote, full-time or part-time. Based in Lviv, Ukraine; relocating to Warsaw in December 2026 (B2B via a Polish entity after relocation). English B2. ``` ## Experience ### Senior Full Stack Engineer (current) Military Tech. May 2025 - Present ```text Develop a distributed platform for real-time sensor monitoring and device control across edge software, backend services, and web interfaces. Build asynchronous Python services and MQTT/Protocol Buffers integrations for telemetry, events, and remote commands. ``` Skills: Python, fastAPI, AsyncIO, React, TypeScript, Redux-toolkit, Leaflet, SQLAlchemy, MySQL, Redis, MQTT, Protocol-Buffers, WebSockets, WebRTC, Computer-Vision, NPUs, OrangePi, NumPy, Scipy, Linux, Pytest ### Senior Python Software Engineer (current) Freelance. Mar 2020 - Present ```text Freelance development and maintenance for clients via Upwork and other platforms, including shorter engagements during 2022-2025. Delivered backend and frontend features, supported existing Django applications, and integrated APIs. ``` Skills: Python, Django, Django-REST-Framework, React ### Senior Full Stack Python / Django / ReactJS Engineer (current) Freelance. Feb 2020 - Present ```text Freelance development and maintenance for clients via Upwork and other platforms, including shorter engagements during 2022-2025. Delivered backend and frontend features, supported existing Django applications, and integrated APIs. ``` Skills: Python, Django, React ### Independent Developer AgentPatterns. Jan 2025 - Dec 2026 ```text Created an educational website and open-source Python examples covering AI agent patterns, tool calling, routing, retrieval, and recovery. Paired practical code with explanations of execution limits, permissions, and failure handling. ``` Skills: Python, OpenAI-API, GitHub-Actions ### Independent Developer OnceOnly. Jan 2025 - Dec 2026 ```text Independently developed an AI agent control service, including the backend, dashboard, deployment, and open-source Python and TypeScript SDKs. Implemented idempotency, policy and budget controls, execution tracking, and LangChain integration. ``` Skills: Python, TypeScript, AsyncIO, HTTP-Based-APIs, Lang-Chain, Pytest ### Senior Full Stack Engineer Upwork. Feb 2025 - Apr 2025 ```text Developed consumption export and synchronization APIs, asynchronous invoice recalculation with Celery, and task-status tracking. Added billing alerts, React/TypeScript UI updates, query optimizations, and automated tests. ``` Skills: Python, Django, Django-REST-Framework, PostgreSQL, Celery, Redis, React, TypeScript, Docker ### Full Stack Engineer Multiple Clients. Mar 2022 - Feb 2025 ```text Development and maintenance engagements for multiple clients through Upwork and other platforms. Work included Django application support, SPA development, and incremental frontend and backend features. ``` Skills: Python, Django, Django-REST-Framework, React ### Full Stack Engineer Upwork. Oct 2020 - Jan 2022 ```text Full-stack development of a real estate platform for publishing property listings and communication with realtors. Developed database models and queries, frontend workflows, and UX improvements. ``` Skills: Python, Django, Next.js, React ### Python Software Engineer Digital farm data management. Sep 2017 - Mar 2020 ```text Implemented IoT infrastructure with Azure IoT Hub, database architecture, API architecture, and reusable code and libraries for future use. ``` Skills: Docker, Jenkins, Kubernetes, Python-2.7-3.7, Tox, Django-2, Django-REST-Framework, PostgreSQL, Swagger, Pytest, Azure, Git, Talend ### Python Software Engineer Software Development Company. Apr 2015 - Feb 2020 ```text Worked on various projects including digital farm data management, mobile notifications, video conferencing, online scheduler, and online challenges for programmers. ``` Skills: Python, Django, Django-REST-Framework, PostgreSQL, React, Redux, Celery, Stripe-API, Twilio-API, Docker, Jenkins, Kubernetes, Azure, NodeJS, AngularJS, MongoDB, WebRTC, MySQL, Flask, JavaScript, jQuery ### Founder & Developer Vehicle Advertising Mobile Platform. Jan 2019 - Dec 2019 ```text Built and released a mobile platform on the App Store and Google Play for tracking advertising campaigns on vehicles. Developed the React Native application and backend workflows. ``` Skills: React-Native, Python, Django, PostgreSQL, PostGIS, REST-APIs, Geospatial-Data ### Full Stack Engineer Mobile notifications. Aug 2018 - Sep 2019 ```text Implemented UX/UI flows for small businesses to notify clients about discounts and upcoming appointments. ``` Skills: Python-3, Django-2, Django-REST-Framework, PostgreSQL, React, Redux, Celery, Stripe-API, Twilio-API, Git, DigitalOcean-VM-Storage, Redis, Figma, Nginx, Docker, Docker-Compose ### Full Stack Engineer Video Conferencing and Webinar Service. Apr 2017 - Sep 2017 ```text Worked with Node.js and socket.io. Implemented core functionality including notifications, modals, and chat. ``` Skills: JavaScript, NodeJS, MongoDB, AngularJS, Socket.IO, WebRTC, Git ### Full Stack Engineer Online scheduler. Apr 2015 - Mar 2017 ```text Developed scheduling features and integrations for a web platform and Outlook desktop application, including Google Calendar/Outlook APIs, Gmail authentication, Hangouts, Google Maps, PayPal, time-zone handling, and background scheduling with Celery and cron. ``` Skills: Python, Django, JavaScript, AngularJS, jQuery, MySQL ### Software Engineer Online challenges for programmers. Apr 2015 - May 2016 ```text Worked on algorithmic problems for a developer competition platform. ``` Skills: Python, Django, Flask, JavaScript, AngularJS, jQuery, MySQL, Docker ### Front-end Web Developer Freelance. Feb 2013 - Feb 2015 ```text Developed website layouts and frontend functionality, refactored existing code, clarified requirements, and estimated and prioritized tasks for European clients. ``` Skills: JavaScript, HTML, CSS ### Front-end Developer Web Sites Development. Jan 2013 - Feb 2015 ```text Developed website layouts and frontend functionality, refactored existing code, clarified requirements, and estimated and prioritized tasks. ``` Skills: JavaScript, HTML, CSS ### Full Stack Engineer Fleet Management Platform ```text Worked as a developer on a production fleet management platform for GPS-based vehicle tracking and operational workflows. Built and maintained backend and frontend features, worked with location data and maps, and supported integrations used for vehicle monitoring and fleet operations. ``` Skills: Python, Django, Django-REST-Framework, PostgreSQL, React, REST-APIs ## Education ### Ukrainian Academy of Printing Specialist, Computer Technologies. 2010 - 2015 ```text Specialist degree in Computer Technologies from the Ukrainian Academy of Printing, completed in 2015. ``` ### Upwork Upwork Skill Certification, Python Development ```text Upwork Skill Certification in Python Development, issued in April 2021. ``` ## Tech stack - Talend - DigitalOcean - Kubernetes - Jenkins - GitHub Actions - React Native - NumPy - PostGIS - MySQL - PostgreSQL - MongoDB - Node.js - Django - Next.js - Figma - Redis - Azure IoT Hub - React - jQuery - AngularJS - JavaScript - Python - Google Maps - Leaflet - MQTT - Celery - Flask - Django REST framework - FastAPI - asyncio - SQLAlchemy - Linux - PayPal - GraphQL - Firebase - Socket.IO - TypeScript - pytest - Git - Docker - WebRTC - NGINX - SciPy - LangChain - Pydantic - OpenAI API - Redux Toolkit - AWS - REST APIs To contact Mykola, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire). ## People also viewed - [Vitalii Toderian](https://himalayas.app/@vitaliitoderian): Full Stack Software Engineer, IdeaInYou - [Nikita Voronov](https://himalayas.app/@nikitavoronov): Full Stack Engineer, Forte Group - [Daniil Rozhok](https://himalayas.app/@daniilrozhok): Full Stack Software Engineer, Acceptic - [Martin Horvath](https://himalayas.app/@martinhorvath): Software Engineer, Incubeta - [Vitaly Sem](https://himalayas.app/@vitalysem): Software Engineer, Zultys Inc - [Artur Sorokolit](https://himalayas.app/@artursorokolit): Full Stack Software Engineer, Graintrack - [Roman S'K](https://himalayas.app/@romansk): Flutter / React Native Developer, Product Company - [Alex User](https://himalayas.app/@alexuser85): Senior Python Engineer, Grid Dynamics - [Mykhailo Humen](https://himalayas.app/@mykhailohumen): Full Stack Engineer, Peppernode OÜ - [Vitalik Dziuba](https://himalayas.app/@vitalikdziuba): Full Stack Developer, BePro