Марян

MAR YAN DI DUK H
AI/ML Engineer · Python Developer · Software Engineer — GenAI, LLMs, RAG
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) (PL) · [open contact info](look above in the "contact info" section) (UA) | github.com/Marian003
English C1 · Polish B2 · Ukrainian (native)

SUMMARY
Software engineer with 2 years of commercial experience across C#/.NET and Python backends, Vue.js and React
frontends, and AI-powered tools. Most of my recent work sits around GenAI — integrating Claude and OpenAI,
designing prompts and RAG pipelines, and shipping LLM features that real users actually interact with.
Comfortable owning a feature end to end: discovery, implementation, tests, and deployment. I enjoy the
analytical side of the job — digging through logs, chasing edge cases, and writing the kind of clean
documentation that saves the next person time.

TECHNICAL SKILLS
Languages: Python, TypeScript, JavaScript, C#, SQL, PHP, Bash
AI / GenAI: Anthropic Claude API, OpenAI GPT-4o, Ollama, prompt engineering, RAG (chunking, retrieval, eval),
multi-agent orchestration, guardrails (hallucination control, token/context management), evaluation
frameworks
Python Stack: FastAPI, pandas, numpy, httpx, asyncio, pytest, scikit-learn (basics), CLI tooling (argparse, click)
Web: React, Next.js 15, Vue.js, TailwindCSS, HTML/CSS, REST APIs, Tiptap/Monaco editors
Databases: PostgreSQL, Oracle, Redis, Prisma ORM, SQL (joins, aggregates, indexing); basic NoSQL familiarity
DevOps & Tools: Git/GitHub, GitHub Actions CI/CD, Docker, Turborepo, pnpm, Postman, Jira, Confluence
Data & Reporting: pandas, plotly, Google Sheets, Power BI (basic), SQL reporting

EXPERIENCE
Frontend Developer — Devocean Oct 2025 – Present
Remote · Delivering client products across healthcare and logistics
EmCell — Cell Therapy Center (regenerative medicine / biotech)
• Building an internal web application for stem-cell passport management and patient records at a clinic with
26+ years in regenerative medicine.
• Shipping responsive forms, search views, and data-entry flows used daily by medical and administrative
staff; built dashboards for cell tracking and treatment history.
• Working directly with clinicians to translate domain requirements into UI that doesn't get in their way.
Gralsen (shipment / logistics)
• Delivering frontend features for shipment and dispatch workflows used by operations staff.
• Building responsive views for order tracking, logistics data entry, and internal reporting screens.
Associate Web Developer & Support Engineer — Vovos / Media Projects May 2024 – Sep 2025
Hybrid · Film-industry platform (35mm.online) · Vue.js + C#/.NET + Python
• Delivered Vue.js features for 35mm.online — content views, filtering, search, accessibility and responsive
fixes — across multiple release cycles.
• Worked on the C#/.NET + Python backend services powering the platform, alongside Umbraco CMS
templating on the frontend side.
• Ran the Umbraco CMS v8 → v13 migration: mapped content structures, validated staging and production,
and wrote the deployment runbooks the team still uses.
 • Owned day-to-day support: ticket triage, log-based root-cause analysis, and clear reproduction steps.
Recurring incidents dropped by roughly 30% after I documented the top failure modes.
• Built and validated REST API integrations in Postman, wrote integration test scenarios, and coordinated UAT
sessions with cross-functional teams.
• Wrote user stories, acceptance criteria, and release notes; prototyped UI concepts quickly with Replit,
Lovable, and Base44 before committing to full development.

KEY SOLO PROJECTS
Mindlink — Multiplayer Human + AI Workspace 2025
Next.js 15, Hono, Claude, OpenAI, Yjs, PostgreSQL, Redis
• A collaborative workspace where humans and AI agents work in the same document in real time. Not a
chatbot and not a copilot — the agents reference each other, debate, and vote on decisions.
• Designed 6 specialized agents (architect, code reviewer, PM, user researcher, security auditor, creative
ideator) routed across Claude and GPT-4o. Each has a distinct system prompt, personality sliders, and
behavior rules.
• Real-time CRDT sync with Yjs + y-websocket; document/code/whiteboard modes via Tiptap, Monaco, and
Excalidraw. Voting system with auto-logged decisions.
• Full stack: Next.js 15 + React 19 frontend, Hono API, Prisma + PostgreSQL, Redis + BullMQ for queueing,
NextAuth for GitHub OAuth, Turborepo monorepo with pnpm workspaces.
ReviewBot AI — AI-Powered Code Review Platform 2025
Python / FastAPI, React / TypeScript, Claude API
• Full-stack app with dual analysis: rule-based static scanning plus live AI review via the Claude API.
• Designed prompt templates and system instructions for structured, safe output — built guardrails for
hallucinations, off-topic answers, and code/data leakage.
• Delivered end to end: discovery, requirements, implementation, tests, landing page, and deploy.
Elvish Language Creator — LLM / RAG Research (Diploma) 2024
Python, Ollama, local LLMs, prompt evaluation
• Built a retrieval-augmented generation pipeline for a constructed-language use case: document chunking,
context injection, prompt templates, and an iterative evaluation loop.
• Ran reliability and format-compliance tests against local LLMs via Ollama and refined prompts based on
observed failure modes.
GitPulse CLI — Developer Productivity Tool 2024
Python, httpx, pytest, GitHub Actions
• Python CLI dashboard for GitHub profile analytics: contribution streaks, language breakdown, repository
metrics.
• Async API integration with httpx, comprehensive pytest + respx test suite, CI/CD via GitHub Actions.

EDUCATION & CERTIFICATIONS
Polish-Japanese Academy of Information Technology (PJAIT), Warsaw — B.Eng. (inżynier), Computer Science,
Feb 2026
Major: Intelligent Data Processing Systems · Final grade: dobry plus · PRK level 6
Ternopil Ivan Puluj National Technical University — Computer Science (previously enrolled) · Lviv IT School
(LITS) — Web Technologies (2020)
Anthropic — Claude Code usage courses (agentic coding workflows, tool use, prompting) · DataCamp —
Associate Data Analyst in SQL
Available in Ukraine / Poland · Open to remote or Lviv-based work · Focus: Python, GenAI delivery, clean documentation