KUMO is a lending protocol secured by carbon credits. Originating as a fork of Liquity, it has evolved into a distinct codebase developed from the ground up.- modified Liquity protocol to support multiple assets, governing and upgradeability (Diamond Pattern)- removed the protocol token and staking contract without impacting the economics of the system- worked with Chainlink and Tellor to modify price feeds- tokenomic upgrades like harmonizing base rate and system-wide recovery mode- created a new codebase for POC lending protocol- wrote custom hardhat tasks- wrote tests using Chai and Mocha- EVM, Solidity, Hardhat, Chainlink, OpenZeppelin, Diamond Pattern, UUPS, Ethers.js

Support and development of Galvanize services - “The Leading Governance, Risk, And Compliance Software”: - work directly with the client from Canada, from the office in Warsaw. - analyze, break down stories into tasks and subtasks. - working on Public API, delivering what the client needs. - upgrade processes between services from synchronous to asynchronous, optimize processes performance (detect and fix N+1 mostly). - monthly monitoring duties (DataDog, Airbrake). - Ruby, Ruby on Rails, PostgreSQL, React but only fixed or added something little, didn’t develop anything from the ground, Jest the same as React, RSpec. Also, a little bit of TypeScript, Serverless with AWS Lambda, Terraform. Deployment is done by the Canadian side to AWS ECS.

Support and development of Speechkit.io - a British startup for automatic scoring of news articles: - work with the team from the UK, Jira, Slack. - integration with various third-party services: * CRMs (Close.com, Mailchimp, Intercom) * Feeds for the news sites (Rystad Energy, Jyllands-Posten, etc.) - the transition from monolithic Ruby on Rails to SPA React + API RoR. - implement Azure Cognitive Services to add new languages. - Ruby, Ruby on Rails, PostgreSQL, Sidekiq for background jobs, RSpec, deployment on Heroku with CI/CD, set up Travis CI environment.Coaching Assembly / Sainoo - HR platform for the markets of Europe and the USA: - the transition from monolithic Ruby on Rails to SPA React + API RoR. API via Grape. - covering existing endpoints with RSpec tests. - Ruby, Ruby on Rails, PostgreSQL, Grape, Sidekiq, RSpec, deployment on Heroku with CI/CD.

API for online debt collector service:- Ruby, Ruby on Rails, PostgreSQL, Sidekiq, RSpec.

Post-release support for Virtual Goods Digital Marketplace:- Ruby on Rails, HTML, CSS.Development of “Create and Print Photoalbum” Service: - REST API backend (authentication, some CRUDs, social networks APIs for photo fetching). - Generating print-ready PDFs, detecting faces via OpenCV for the smart cropping. - Ruby, Ruby on Rails, RSpec, Sidekiq for background jobs, PostgreSQL, deployment on Heroku, manually 😌

My first steps into Ruby on Rails development!- Ruby, Ruby on Rails, HTML, CSS, Slim, RSpec