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Hey, I'm Konrad
Product Delivery · Ruby Engineer

10+ years building Rails products, DDD, DevOps, and AI features. Fast delivery with clean, well-tested, production-ready code.

Rails 8 DDD Kubernetes CI/CD Hotwire · React AI / MCP
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How I can help

I design and deliver Rails apps end-to-end: domain analysis, architecture (DDD/event-driven), development and integrations, CI/CD and Kubernetes/Docker infra. I join existing codebases to reduce technical debt, run Rails upgrades, and stabilize production. I build AI features (LLM, MCP, function calling), process automations, and fast MVPs that stay ready to scale. I can also act as a co-founder/partner, investing time and expertise on an equity basis.

If you are starting from zero, I can step in as a technical co-founder: co-design the roadmap, ship the first version, and keep it running in a partner model (equity + time).

Skills

Backend
Ruby Ruby on Rails Rails Event Store Sidekiq Python
Frontend
Hotwire Stimulus React TypeScript Vue Angular
DevOps / Cloud
Docker Kubernetes GitLab CI/CD Terraform/CloudFormation AWS
Databases
PostgreSQL MySQL Firebird MS SQL PostGIS
AI & Automation
Model Context Protocol (MCP) LLM / function calling Process automation AI integrations in products

Experience

2025-08 - present Co-Founder · Lead Developer · Full-Stack Engineer

Finrizon AI

  • Designed and built from scratch a multi-tenant finance framework for CFOs and controllers.
  • DDD architecture with Event Sourcing (Rails Event Store, Command Bus) for the finance domain.
  • Financial forecast sheets with dynamic time ranges (Actuals/Forecasts).
  • Integrations with Anthropic Claude and OpenAI GPT via RubyLLM abstraction.
  • AI finance chat (multi-agent, RAG, embeddings) for real-time analytics.
  • Real-time UI with Hotwire (Turbo + Stimulus).
  • Stack: Rails 8.0, PostgreSQL 14+, Sidekiq, Hotwire, RubyLLM, Anthropic Claude API, OpenAI API, Rolify, Rails Event Store.
2025-01 - present Senior Ruby Developer

12B Ltd. & Argen Corporation

  • Rails development and maintenance, technical debt reduction.
  • React/TypeScript front-end for new product features.
2023-02 - 2024-12 Senior Ruby Developer

Johnnybros Sp. z o.o.

  • Product development, refactors, new gems and applications in Rails.
  • Led migration from Rails 5.2 to Rails 7.1, cutting technical debt.
  • Python tooling, JavaScript work, DDD with Rails Event Store.
2021-07 - 2023-02 Senior Ruby Developer

Ailleron S.A.

  • Rails features, stabilization, and debt handling.
  • Angular/TypeScript front-end for the iLumio application.
2020-10 - 2021-07 Senior Ruby Developer

Get it Dan Ltd.

  • Ruby: Redmine plugins and integrations.
  • DevOps: GitLab CI/CD, Docker Swarm, pipelines.
2020-01 - 2020-10 DevOps Engineer

LCloud Sp. z o.o.

  • AWS IaaS, Serverless, Kubernetes; automation and environment care.
  • Lambda, Step Functions, IaC with SAM, CloudFormation, Terraform.

Delivered projects

Finrizon AI https://finrizon.ai

AI-assisted forecasting and financial analysis for CFOs; multi-tenant, ledger import, financial sheets.

Rails 8 Stimulus/Hotwire PostgreSQL Sidekiq Kubernetes RubyLLM
Malort Lublin https://malort.lublin.pl

Studio management app: bookings, online payments, DDD.

Rails 7 Rails Event Store Hotwire PostgreSQL Kubernetes
Fertilizer planning app (nawozowy.oschr.pl) https://nawozowy.oschr.pl

Fertilizer plans with PDF reports for agricultural chemistry centers.

Rails 5 PostGIS ActiveAdmin Vue 2 Docker Compose