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Mateusz Zdanowicz

Ruby Developer

10 years of experience

● Available
Mateusz Zdanowicz
About me

A few words about myself

Developer with experience in full-stack web development, API design, and system maintenance. Skilled in building and optimizing web applications using Ruby on Rails and JavaScript, with expertise in PostgreSQL and MySQL databases. Adept at refactoring legacy systems, implementing new features, and ensuring application compliance with industry standards. Experienced in working with various frameworks, automation tools, and Agile methodologies. Passionate about writing clean, maintainable code and improving development processes.

Technical skills

Tech stack

Backend

Ruby Ruby on Rails RSpec Basics of Python PHP PostgreSQL MySQL InfluxDB REST API Sidekiq

Frontend

JavaScript jQuery CSS HTML haml slim Bootstrap CoffeScript

Tools

Git GitHub Bitbucket Docker WSL

Languages

English (Intermediate) Polish (Native)
Education

Schools & universities

2010 – 2015

Siedlce University of Natural Sciences and Humanities

Engineer / IT

Experience

Projects & experience

Backend API

2016-01 – 2016-04

Backend API for mobile SDK for collecting app events.

Technologies

Elixir Phoenix PostgreSQL Heroku

Responsibilities

  • Implementing HTTP API and admin panel

Material trading platform for B2B

2016-05 – 2017-12

Web app with front-ends for clients and administrators.

Technologies

Ruby on Rails MySQL JavaScript ActiveAdmin

Responsibilities

  • Maintenance of system for occurring errors
  • Implementing new features on backend and frontend
  • Implementing new frontend design

2018-01 – 2019-12

International behavioural assessment platform.

Technologies

Ruby on Rails MySQL JavaScript

Responsibilities

  • Maintenance of system for occurring errors
  • Implementing new features on backend and frontend
  • Implementing custom PDF reports
  • Updating application and data for GDPR compliance

2020 – 2020

Employee management platform.

Technologies

Ruby on Rails Rails Event Store Grape Azure

Responsibilities

  • Implementing new features on backend

2020 – 2023

Survey browser for financial institutions.

Technologies

Ruby on Rails JavaScript Highcharts PostgreSQL InfluxDB Grafana Capistrano

Responsibilities

  • Maintenance of system for occurring errors
  • Implementing new features on backend and frontend
  • Configuring user access based on roles and regions
  • Importing and exporting data using CSV/Excel formats
  • Creating application monitoring dashboard

2023 – 2023

Websites for ad testing.

Technologies

PHP JavaScript HTML CSS

Responsibilities

  • Implementing responsive mockups of existing websites and stores for ad research purposes

2023 – 2023

Online survey panels.

Technologies

PHP JavaScript HTML CSS PostgreSQL

Responsibilities

  • Implementing frontend from design project
  • Implementing admin panel frontend
  • Writing user access and management, sending e-mails

JLL

2024 – present

Property Management Platform for Real Estate market analysis.

Technologies

Ruby on Rails RSpec JavaScript Sidekiq Docker PostgreSQL

Responsibilities

  • Maintenance of system for occurring errors
  • Implementing new features on frontend and backend
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