Got an idea? I'd love to help!

I turn ideas into working solutions.

I build websites, web applications, and SaaS products.

Write to me →

How I can help

Services

Websites

A modern site for your practice, studio, or project. You tell me what you need — I handle the rest.

Web applications

I help entrepreneurs without a technical team turn ideas into working products.

Mobile apps

Cross-platform apps for iOS and Android. Performance, consistent UI/UX, and easy product growth.

Tech stack

For recruiters and teams

Ruby & Ruby on Rails

Writing Rails since 2013. Experience with Hotwire, Turbo, Stimulus, ActiveAdmin, Devise, Pundit, Rolify, Slim, Twilio, Stripe, Rubocop, RSpec, Minitest.

HTML, CSS, JS

I use SvelteKit, React, and Node.js. I apply Tailwind CSS and Drizzle ORM, keep code quality with ESLint and Prettier, and write tests with Vitest and Playwright.

AI & agentic engineering

I build AI solutions — chatbots, agents (including voice and telephony), and RAG systems. I integrate LLMs (OpenAI, Anthropic) into applications via LangChain.

About

A bit about me

I'm from Poland, and I've been living in Bulgaria for many years. I'm an outdoor person — I love hiking, especially in the mountains.

Projects

What I'm building

Personal project WhenSpace ↗

A mobile app that brings order to your day — combining tasks, calendar, and habits in one place. No unnecessary clutter, with a focus on simplicity and clarity.

Contact

Let's collaborate

I'm open to new projects. Not sure if I'm the right fit? Write anyway — I'll be honest.

marcin@syngajewski.com

marcin@syngajewski.com →