Roman

ROMAN NYTKA
Python Backend Developer (FastAPI)
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Uzhhorod, Ukraine

SUMMARY
Python backend developer focused on reliable, well-tested APIs — systems you can audit, reproduce and trust in
production. My main work is ClairDiag, a deterministic clinical triage/orientation engine for a French healthtech product (an
orientation aid — not a diagnostic tool, by design), validated across 930 adversarial runs with zero critical misses and 350+
automated tests. I also build backends where AI genuinely fits, such as CRM lead scoring on a strict human-in-the-loop
model. Strong on clean service-layer architecture and testable, reproducible systems.

TECHNICAL SKILLS
Backend: Python 3.11, FastAPI, Pydantic, SQLAlchemy 2.x (sync & async / asyncpg)
Databases: PostgreSQL, SQLite
Auth & Access: JWT, OAuth2, bcrypt, Role-Based Access Control (RBAC)
Testing: Pytest, TestClient — unit, integration & adversarial coverage; CI regression gate
Async & Background: asyncio, FastAPI BackgroundTasks
AI Integration: Anthropic Claude API, structured JSON output, human-in-the-loop design
Migrations & DevOps: Alembic, Docker, Docker Compose, Railway, Render, Vercel
Architecture: Service layer, dependency injection, deterministic rule engines
Other: Git, REST API design, pagination & filtering

EXPERIENCE
Python Engineer — Virea Global Mar 2026 – Present
Part-time · Remote
ClairDiag — a deterministic clinical triage/orientation engine for a French healthtech product (an orientation aid, not a
diagnostic tool — by design), deployed to production.
• Owned key changes to the triage engine; proposed and implemented a deterministic, rule-based approach in place of
an LLM — reproducible, explainable output (same input → same result).
• Zero critical misses across a 930-run adversarial validation suite; full physician-facing audit trail for every decision.
• Backed the engine with 350+ automated tests (unit, integration, adversarial) and a CI regression gate.
• Built the REST API layer with FastAPI + Pydantic; containerized with Docker, deployed to cloud production (Railway).
• Impact: in internal blind reviews, evaluators preferred the engine’s orientations for clarity over general-purpose LLM
outputs.
Live: clairdiag-production-e813.up.railway.app/v3
Stack: Python · FastAPI · Pydantic · Docker · pytest
Python Developer — Confidential (NDA) Dec 2025 – Mar 2026
Full-time · Remote
Backend for a CRM lead-management service with AI-assisted lead scoring.
• Integrated the Claude API for lead scoring on a strict human-in-the-loop model — AI recommends a score + reason; the
manager decides.
• Stage state machines with sequential transition validation and locked terminal states (no stage skipping).
• Multi-condition transfer logic with atomic transactions (stage update + sale creation in a single commit).
• Async PostgreSQL (SQLAlchemy 2.x, asyncpg), Alembic migrations, Docker Compose with healthcheck-based startup
ordering.
• Impact: streamlined lead processing and reduced manual triage for managers by moving scoring to an AI-assisted,
human-in-the-loop flow.
Stack: Python · FastAPI · PostgreSQL · SQLAlchemy 2.x · Claude API · Docker Compose · Alembic

PROJECTS
Task Automation Backend API 2025
Containerized REST API for managing asynchronous automation tasks with execution history and role-based access.
• JWT authentication with bcrypt; Role-Based Access Control (owner-restricted CRUD, admin-level monitoring).
• Transactional TaskRun creation with concurrency control to prevent duplicate execution.
 • Background execution via FastAPI BackgroundTasks; status transitions pending → running → done / failed.
• Pagination, filtering, ordering; indexed foreign keys; Alembic migrations; 15+ integration tests with transactional
rollback.
GitHub: github.com/myusername007/task_automation_backend · Live: task-automation-backend.onrender.com/docs
Stack: Python · FastAPI · PostgreSQL · Docker Compose · Alembic · pytest
Decentralized Identity Verification System (SSI) 2024 – 2025
Decentralized identity management based on Self-Sovereign Identity (SSI) principles.
• Ethereum smart contract for identity metadata; Verifiable Credentials stored off-chain as JSON in IPFS.
• Immutable CID hashes recorded on-chain for integrity verification.
• Identity lifecycle operations: registration, update, revocation, verification.
GitHub: github.com/myusername007/…SSI · Live: bakalavr.vercel.app
Stack: Solidity · Ethereum (Sepolia) · IPFS · React

EDUCATION
Master's Degree — Computer Engineering 2025 – 2026 (expected)
Uzhhorod National University
Bachelor's Degree — Computer Engineering 2021 – 2025
Uzhhorod National University

LANGUAGES
English — B2 · Ukrainian — C2