Yevhenii Hurin

Senior Software Engineer

Professional Summary

Senior Ruby/Rails Engineer with over 20 years of full-stack development experience and 15 years of remote work expertise. During personal time, built production AI-powered applications including PromptMaster.pro and Project Mythonix, featuring Rails backends with serverless inference architecture for multiple LLM and image generation models. Self-taught expertise in integrating AI services into Ruby applications, cost-optimized AI infrastructure, and AI-powered product development. Seeking senior Ruby engineering roles with AI integration opportunities.

Contact Information

• location: Kotka, Finland
• Phone: +358 40 221 25 32
• Email: [email protected]
• GitHub: https://github.com/hoblin
• LinkedIn: https://www.linkedin.com/in/hoblin/

Technical Skills

• Ruby/Ruby on Rails: 17 years
• Javascript: 20 years
• PostgreSQL: 16 years
• AWS: 9 years
• React/Redux: 5 years
• Kubernetes: 5 years
• Generative AI & LLMs: 3 years (production systems)
  • Models: Stable Diffusion 1.5, FLUX.dev, GPT-3.5, GPT-4, GPT-4o, GPT-OSS, Claude, LLaMA 3.2, Mistral
  • Platforms: OpenAI APIs, Anthropic APIs, Ollama, RunPod
  • Infrastructure: Serverless inference workers, cost optimization, scalable deployment
• ElasticSearch, Redis, RabbitMQ, GraphQL, REST APIs

Personal AI Projects & Systems

AI-Powered Ruby Applications - 3 years (2022-2025)

Personal projects developed during evenings, weekends, and vacations

• PromptMaster.pro: Rails-based systematic text-to-image prompt research platform with controlled experiment framework and visual library for synonyms.
• Project Mythonix: Ruby/Rails AI-powered procedural game universe generator with multi-stage LLM pipelines
• Serverless AI Integration: Cost-optimized Rails backends with serverless inference workers for Stable Diffusion, FLUX.dev, and self-hosted LLMs
• Rapid Model Integration: GPT-OSS RunPod worker (3 days post-release), seamless API integration in Rails applications

Technologies: Ruby, Rails, Python (AI workers), Stable Diffusion, FLUX.dev, GPT-3.5/4/4o/OSS, Claude, LLaMA 3.2, Mistral, OpenAI/Anthropic APIs, Ollama, RunPod, LangChain, Serverless Architecture

Professional Experience

Senior Software Engineer | Assembly Global (Remote)

3 years (2022-2025)

Global media and marketing agency specializing in data-driven advertising solutions and analytics

Participated in strategic refactoring of a complex AWS applications infrastructure into a cloud-agnostic modular architecture. Designed and implemented architectural changes following Process/Service patterns to enable code reusability across microservices. Restructured data layer to allow microservices to efficiently reuse core data models with minimal dependencies. During the last year worked in a maintenance team investigating complex issues.

Technologies: Ruby, RoR, AWS services, PostgreSQL, Redis

Senior Software Engineer | Smartly.io (Remote)

1 year (2021-2022)

Social advertising management and automation solutions

Expanding Distillery Query Language (DQL) with new features. DQL is a domain-specific proprietary requests language to build flexible reports on advertising statistics data stored in PostgresSQL. It is a service to transform proprietary requests format from different client applications into complicated SQL requests.

Technologies: Ruby, DSL, PostgreSQL, TypeScript, RabbitMQ, Redis, ElasticSearch, Kubernetes

Senior Software Engineer | ThredUp (Remote)

3 years (2019-2021)

The world's largest fashion resale platform, inspiring a new generation to think secondhand first

As a member of Operations Engineering team i was working mostly on software for Distribution Centres (more than 20 apps). Decoupling monolith Rails application into several React apps with centralised Rails API. New React/Rails apps development. Moving common frontend dependencies into NPM package. Reducing support pressure by automating data issues resolving. Improving/standardising development processes. Developers support/training.

Technologies: React, Redux, Jest, RoR, RabbitMQ, Redis, MySQL, Kubernetes, Cassandra, ElasticSearch, GitHub Packages

Software Engineer | Faria Education Group (Hybrid)

about a year (2018-2019)

Curriculum-First Learning Platform

External services integrations, new features implementation (full stack), bug fixes, tests coverage improvements

Technologies: RoR, JS, MySQL, Google API, Highcharts, HAML, JQuery, RSpec, Capybara, VCR

Software Engineer | Apptopia (Remote) - 3 years (2015-2018)

Mobile app marketplace and analytics platform - Full-stack development, data processing, external API integrations

Backend Developer | Toptal LLC (Remote) - 1 year (2013-2014)

Marketplace platform - Backend development, notifications system, external integrations

Lead Developer & System Architect | Gera IT (Remote) - 3 years (2010-2013)

Outsource company - Healthcare and financial systems

• Financial Platform (2011-2013): Full-stack development for high-loaded data feed marketing platform
• Medical Systems (2011-2012): ASC X12 EDI implementation for US Medical Clinics invoice processing
• Immunization System (2011): Authentication, data processing, CI setup for patient tracking
• Healthcare System (2010-2011): System architecture, OAuth provider, API development for distributed financial system

Senior Developer | DataXu (Remote) - 1 year (2009-2010)

Marketing platform - Code refactoring, TDD implementation, features development

Lead Developer | REMFU Media - 3 years (2008-2010)

Media startup - Multiple video and social platforms

• Online Cinema (Kenguru TV) (2009-2010): Full-stack development for VoD service
• SciFi Sofa (2008-2010): Backend and Flash development for VoD with Adobe Air frontend
• Team Management System (2008-2009): Full-stack architecture for Twitter-like collaboration platform
• Social Network (2008-2009): Full-stack development with custom roles and permissions system