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Marcin – Ruby on Rails, Ruby, React, experts in Lemon.io

Marcin

From Poland (GMT+2)

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Full-stack Web DeveloperSenior
Hire developer
12 years of commercial experience
Business intelligence
Cybersecurity
Legal tech
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Marcin – Ruby on Rails, Ruby, React

Meet Marcin. He is a skilled Senior Ruby on Rails expert and a big fan of Elixir with extensive experience since 2012. Marcin has held positions as a CTO, CEO, and team lead, offering valuable leadership insights. He focuses on delivering product value and has contributed to open-source projects, led a startup, and enjoys playing Poker. Marcin's diverse experiences and collaborative approach make him an engaging and knowledgeable colleague.

Main technologies
Ruby on Rails
6 years
Ruby
6 years
React
3 years
Additional skills
Elixir
SQL
PostgreSQL
Heroku
AWS
Docker
Phoenix
Python
GCP
RabbitMQ
Redis
Typescript
Ready to start
immediately
Direct hire
Potentially possible

Experience Highlights

Senior Full-stack Developer
Dec 2021 - Ongoing2 years 5 months
Project Overview

A "Google for the law." They are a leading provider in Denmark and Sweden of mission-critical information in legal, tax and accounting, environmental, health, and safety. The app uses advanced algorithms to help find the correct paragraph in the legal code.

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Responsibilities:
  • Created new features for the client management app;
  • Worked on the ongoing transition from one extensive database to another;
  • Improved codebase by refactoring and removing old code;
  • Upgraded gems;
  • Wrote tests with RSpec and Cucumber.
Project Tech stack:
Ruby on Rails
PostgreSQL
Docker
GCP
React
Full-stack Software Engineer
Jan 2021 - Nov 202110 months
Project Overview

A Content Optimization Platform. It helps users to create valuable and well-positioned content. It also analyzes the whole domain and serves tips on how to improve its position in search engines.

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Responsibilities:
  • Created a new significant feature: domain content planner - a complex tool to prepare content that generates traffic inside the domain;
  • Co-developed AI recognition for texts;
  • Was in charge of bug fixes (both in backend and frontend);
  • Wrote automatic tests for the platform.
Project Tech stack:
Elixir
React
PostgreSQL
GCP
Senior Back-end Developer
Aug 2019 - Dec 20201 year 4 months
Project Overview

A platform to set up surveying clients and calculate NPS for businesses. It uses mailers, automation tools, artificial intelligence, and scrapers to raise brand awareness.

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Responsibilities:
  • Developed both the main app with new features and the side apps with an admin panel and business intelligence app for side apps;
  • Created a couple of 3rd party integrations with additional mailers;
  • Created business intelligence notebooks from scratch;
  • Transitioned from Heroku to AWS stack by using Docker;
  • Wrote automated tests.
Project Tech stack:
Elixir
Ruby on Rails
PostgreSQL
Heroku
AWS
Docker
Ruby
Phoenix
Python
Senior Back-end Developer
Nov 2018 - May 20196 months
Project Overview

The company provides its services based on in-house developed technology. They bring comprehensive cybersecurity and IT risk detection solutions to monitor the IT infrastructures of global market leaders and public authorities. The project Marcin focused on was a web app for managing tools for automated security checks for servers. It was targeting both SMBs and a separate version for Enterprise

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Responsibilities:
  • Co-developed backend app from scratch;
  • Had an impact on the way the app was architected;
  • Added RabbitMQ integration;
  • Wrote automated tests and did some minor front-end changes.
Project Tech stack:
Ruby on Rails
Ruby
PostgreSQL
RabbitMQ

Education

2014
Computer Science (specialization: Web and Mobile Technologies)
Master

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