# Roman S'K

Roman S'K is a remote worker on Himalayas, Flutter / React Native Developer at Product Company, based in Ukraine.

Source: https://himalayas.app/@romansk

```text
I build production AI/LLM systems, RAG workflows, and full-stack products from ambiguous requirements to launch.
```

| Detail | Value |
| --- | --- |
| Availability | Looking for a job |
| Location | Ukraine |
| Authorized to work in | Ukraine |
| Salary expectations | 60k+ USD |
| Job categories | Full Stack Developer, AI Engineer, Backend Engineer, Mobile Application Developer |
| Skills | OpenAI API, RAG, Embeddings, Vector Search, Agent Design, PyTorch, NodeJS, NestJS, Express, Python, fastAPI, AsyncIO, REST API Design, WebSockets, System Architecture, API Architecture, React, Next.js, Redux, Redux toolkit, TypeScript, JavaScript, PostgreSQL, Prisma ORM, Elasticsearch, Redis, Kafka, Docker, Git, CI CD, Claude Code, BullMQ, Flutter, React Native, Firebase, Supabase, Kibana |
| LinkedIn | https://linkedin.com/in/roman-sahaidak-24a706224 |
| GitHub | https://github.com/RiMac902 |

## What I'm looking for

```text
I'm looking to build production AI/LLM-powered product features end to end, turning ambiguous requirements into reliable systems across backend and frontend.
```

## About

```text
I've built production-style AI/LLM systems, including a RAG system from scratch and an agent that investigates incidents and generates reports autonomously.

For Corridor Watch, I built a Python/FastAPI detection service that correlated telemetry from three simulated sources through Apache Kafka, indexed data in Elasticsearch, and surfaced it through Kibana dashboards.

As the sole developer for an AI accounting platform, I designed and built the NestJS, Prisma, PostgreSQL, and React product from requirements through production, including Redis/BullMQ processing and OpenAI-powered document workflows.

Across five commercial mobile domains, I've delivered end-to-end features in Flutter and React Native while supporting REST APIs, Firebase/Supabase backends, and CI/CD to keep releases moving.
```

## Experience

### Flutter / React Native Developer

Product Company. Jan 2023 - Jan 2026

```text
Delivered production features across 5 commercial domains (dating, social networking, logistics, eCommerce, gaming), owning features end to end from technical breakdown to release. Worked across the stack when needed to unblock releases.
```

Skills: Flutter, React-Native, REST-APIs, Firebase, Supabase, CI-CD

### Rail-Line Monitoring PoC

Corridor Watch. Jan 2026 - Present

```text
Built a detection service in Python/FastAPI/asyncio that correlates events from simulated telemetry sources streamed through Apache Kafka and indexed into Elasticsearch. Added an LLM agent that investigates flagged incidents and autonomously generates incident reports.
```

Skills: Python, fastAPI, AsyncIO, Kafka, Elasticsearch, Kibana, LLM-Agents, OpenAI-API

### AI Engineering, Applied RAG & LLM Systems

Self-directed. Jan 2026 - Present

```text
Built a working RAG system from scratch including tokenization, embeddings, vector search, and OpenAI API integration. Applied this to production-style projects such as an LLM agent for incident investigation and real-time game logic.
```

Skills: RAG, OpenAI-API, Embeddings, Vector-Search, Agent-Design, PyTorch

### AI Game Director, Backend Prototype

Independent project. Jan 2026 - Present

```text
Built a FastAPI backend with PostgreSQL, Redis, and WebSockets, integrating the OpenAI API to drive dynamic server-side logic in real time under latency constraints.
```

Skills: fastAPI, PostgreSQL, Redis, WebSockets, OpenAI-API

### Full-Stack Developer

AI Accounting Platform. Jan 2025 - Present

```text
Designed and built the product's backend (NestJS, Prisma, PostgreSQL) and frontend (React 19) from scratch as the sole developer, owning the system from requirements to production. Added asynchronous job processing and integrated the OpenAI API for document understanding and generation.
```

Skills: NestJS, Prisma, PostgreSQL, React, Redis, BullMQ, OpenAI-API, Document-Processing

## Education

### Lviv Polytechnic National University

Bachelor of Computer Science, Computer Science. 2021 - 2025

```text
Pursued a Bachelor of Computer Science degree, completing studies in 2025.
```

## Tech stack

- React Native
- Flutter
- PostgreSQL
- Node.js
- Next.js
- NestJS
- Redis
- React
- JavaScript
- Python
- PyTorch
- Kafka
- BullMQ
- FastAPI
- asyncio
- Kibana
- Firebase
- Elasticsearch
- Redux
- TypeScript
- Git
- Docker
- Supabase
- OpenAI API
- Claude Code
- Redux Toolkit
- Express
- Apache Kafka

To contact Roman, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire).

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