Marcin
From Poland (GMT+2)
13 years of commercial experience
Lemon.io stats
1
projects done72
hours workedOpen
to new offersMarcin – 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.
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Potentially possibleExperience Highlights
Senior Full-stack Developer
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.
- 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.
Full-stack Software Engineer
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.
- 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.
Senior Back-end Developer
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.
- 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.
Senior Back-end Developer
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
- 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.