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Mykola DMD
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Mykola D

@mykolad

Senior Full Stack Engineer, 10+ years: Python, Django, FastAPI, React, TypeScript. Real-time DefTech, PostGIS, LLM/RAG integrations.

Ukraine
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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

Work history, roles, and key accomplishments

MT
Current

Senior Full Stack Engineer

Military Tech

May 2025 - Present (1 year 6 months)

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.

FR
Current

Senior Python Software Engineer

Freelance

Mar 2020 - Present (6 years 8 months)

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.

FR
Current

Senior Full Stack Python / Django / ReactJS Engineer

Freelance

Feb 2020 - Present (6 years 9 months)

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.

AG

Independent Developer

AgentPatterns

Jan 2025 - Dec 2026 (1 year 11 months)

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.

ON

Independent Developer

OnceOnly

Jan 2025 - Dec 2026 (1 year 11 months)

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.

MC

Full Stack Engineer

Multiple Clients

Mar 2022 - Feb 2025 (2 years 11 months)

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.

UP

Full Stack Engineer

Upwork

Oct 2020 - Jan 2022 (1 year 3 months)

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.

VP

Founder & Developer

Vehicle Advertising Mobile Platform

Jan 2019 - Dec 2019 (11 months)

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.

OS

Full Stack Engineer

Online scheduler

Apr 2015 - Mar 2017 (1 year 11 months)

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.

FR

Front-end Web Developer

Freelance

Feb 2013 - Feb 2015 (2 years)

Developed website layouts and frontend functionality, refactored existing code, clarified requirements, and estimated and prioritized tasks for European clients.

WD

Front-end Developer

Web Sites Development

Jan 2013 - Feb 2015 (2 years 1 month)

Developed website layouts and frontend functionality, refactored existing code, clarified requirements, and estimated and prioritized tasks.

FP

Full Stack Engineer

Fleet Management Platform

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.

Education

Degrees, certifications, and relevant coursework

UP

Ukrainian Academy of Printing

Specialist, Computer Technologies

2010 - 2015

Specialist degree in Computer Technologies from the Ukrainian Academy of Printing, completed in 2015.

Upwork logoUP

Upwork

Upwork Skill Certification, Python Development

Upwork Skill Certification in Python Development, issued in April 2021.

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