Miłosz Sędziak

ERP System for Manufacturing (Ruby on Rails, PostgreSQL - ongoing) Currently designing and developing a custom ERP system for a production facility. Focus areas include production planning, order tracking, work time registration, and real-time inventory of finished goods. Responsible for overall architecture, data modelling, and backend logic. Foodsharing Platform (Ruby on Rails, Hotwire, PostgreSQL) Developed a web application for a non-profit foundation that enables restaurants and food businesses to offer leftover meals or excess food for collection by volunteers. Implemented a reservation system, intuitive listing workflow, and secure access for partners and users. Built with Ruby on Rails and Hotwire to provide a fast, reactive user experience with minimal JavaScript.

After an intense period of professional work, I decided to hit pause and do something I had always dreamed of – set off on a journey across Europe (and beyond!). ✈️🧳 This break gave me the chance to explore new cultures, meet incredible people, and gain fresh perspectives that I’ll carry into my next professional chapter. 🌟 📍 Countries I visited: 🇱🇹 Lithuania 🇱🇻 Latvia 🇪🇪 Estonia 🇫🇮 Finland 🇳🇴 Norway 🇵🇹 Portugal 🇲🇦 Morocco 🇭🇺 Hungary 🇮🇹 Italy 🇸🇰 Slovakia 🇦🇹 Austria 🇨🇿 Czech Republic It’s been an unforgettable journey – full of reflection, learning, and inspiration. I’m coming back recharged, with a clear mind and plenty of new ideas! 💡💼 #careerbreak #travel #mindset #inspiration #lifebalance #growth #newperspectives

Senior backend developer of a new crowdfunding platform. Managed the entire backend lifecycle - from initial design to production release - without a single critical error. - Designed the database and application architecture from scratch - Developed a JSON API for a SPA frontend, with Swagger tests and full documentation - Built a high-performance admin panel for managing fundraisings, payments, withdrawals, users (Elasticsearch-based filtering) - Integrated payment system with AML and KYC verification - Implemented app-level security: CORS, httpOnly cookies, CSRF protection, and anti-DDoS scripts

Contributed backend features to a restaurant event booking platform within a short-term contract. - Delivered backend improvements, new feature delivery, and system maintenance - Worked closely with distributed team to support releases

I went back on a full-time contract to grow Process Optimization (R&D) team. It's a nice place with Agila, Scrum and mature e-commerce product written with all of the good practices (solid/rubocop). That's why I came back here not only as a freelancer. - Working in 7 people R&D team with SCRUM/Agile practice - Backend apps Ruby on Rails 8 Services and one Monolith, one Sinatra app - frontend libraries Vue.js, React and code in HAML, JavaScript Bable/ES6, SCSS - Writing code covered in integration test on Rspec and Cypress integrated on Circle CI - data storage in MariaDB/MySQL, Redis and Firebase - organising scrum workflow using Jira and Confluence/Google Docs - lots of Code Review for Pull Requests on GitHub to maintaining code quality - elimination of technological debt - Integration with Salesforce CRM My task was to develop an e-commerce application, which included a few neat services and new technology. I was supposed to acquire customers through cooperation with the marketing department and maintain them so that they become regular customers. Additionally, I was developing call center system for sales increasement and ASAP calls

Developer at a top Polish software house, involved in multiple internal and client-facing projects. Worked in cross-functional teams using modern tools and best development practices. During this time, I contributed to five distinct projects, each with its own business domain, technical stack, and level of complexity-ranging from legacy systems to greenfield applications. This experience gave me broad exposure to various architectures and team dynamics. Technologies: Ruby on Rails, Grape, React, Node.js, Gatsby, Docker, AWS CI/CD, Backbone, Dry.rb, Swagger Interesting projects: - Studies Online: 10 years mature project with lots of legacies, hard to develop but possible with an Agile organized team (Rails 4.2, Ruby 2.4.6). - Platform to easy investment without knowing about it (Rails 5.1.7, Ruby 2.4.6, Grape API, React). - Real estate online: Worked on Node.js backend services - Participated in Amazon CodeDeploy (CI/CD) course for deployment automation

Fullstack Developer and Scrum Master for an analytics tool collecting and aggregating Wi-Fi Hotspot data across cities. Focused on backend integrations and marketing feature development for international clients. - Developed and maintained Rails backend with MySQL and MSSQL support - Integrated third-party services: Facebook, WhatsApp, Mailjet - Used VCR/Webmock for integration testing and Capistrano for deployments - Facilitated Agile ceremonies and team coordination as Scrum Master

Here I developed into a FullStack programmer in less than a year. Build an e-commerce application, which includes a few neat services and new technology. - Developed partnership program application with dynamic withdrawal flow - Worked across backend and frontend stack (Ruby on Rails, Vue.js) - Collaborated with business stakeholders to define requirements and maintain customer engagement tools

Workshops organised by the Selleo company gave me the opportunity to work under the guidance of experienced professionals. During them, I have been working mainly with such frameworks as Ruby on Rails and Ember JS. My skills in usage of Ruby, JavaScript, Git, CSS, Bootstrap RSpec and Firebase have developed. What is more, I have learnt pair programming. I also have created a few applications and I have worked on some commercial projects. During one month spent in the company, I have developed my programming skills and I was able to see how does it look like to be a part of IT industry.