Oleksandr Avoiants Email & Phone Number

Kraków, Łódzkie, Poland

• Developed and Enhanced Features: Designed and implemented new features for a pharmaceutical application, contributing to both backend (Node.js, Serverless, AWS Lambda, DynamoDB, OpenSearch, gRPC) and frontend (React, TypeScript, Apollo GraphQL) development. • Feature Design & UX Improvements: Actively participated in the design process, offering suggestions to enhance functionality and improve user experience (UX), ensuring a seamless and intuitive interface for users. • Environment Setup & Optimization: Set up and optimized the development environment, including containerizing services with Docker to streamline deployment and scalability. • Development Environment Tools: Created a gRPC authentication service in Go specifically for the development environment, simplifying setup and improving developer efficiency. • Automation Testing: Developed and maintained automated tests to ensure the reliability and stability of new and existing features, contributing to a high standard of code quality.

Architecture development and creation of e-commerce solutions for small and medium-sized retailstores, which include several services: - Shop admin for product management; - Shop builder tocreate a front-end app based on DB data; - Orders API to handle order creation, paymentprocedures and shop manager notifications.Technologies: Ruby on Rails, Python, Django, Tailwind CSS, Elixir Phoenix, REST APIs, PostgreSQL,Git, Github.

London, England, United Kingdom

Developed and maintained order synchronization software. Integrated SSO identity providers into the system, supported new clients and created interfaces for NetIQ and Okta identity providers. Designed, created, and integrated the app for A/B testing into the current system. Reviewed and improved security of third-party apps auth. Created and reviewed software for warehouse operations, constantly communicating with the warehouse team.

Kyiv, Ukraine

I worked in the Warehouse-Operations Engineering team where I developed and supported inbound and outbound apps for warehouse operations. Integrating new carriers, communicating with engineers from other companies, and supporting and enhancing the shipping tracking system. Created frontend and worked on backend for conveyors admin app for enabling/disabling carousels at automated warehouses. Created UI and API for the pre-fulfillment process of garment orders for an automated distribution center. Rewrote pack station app for order fulfillment. Created shipment tracking API and notifications for web store and mobile apps to provide customers with information about package delivery. Regular tech and security vulnerability upgrades. Rails framework upgrades to the latest version. Ruby upgrades. RabbitMQ, Redis migrations.Technologies: Ruby on Rails, React JS, React Native, Redux, MySQL, RSpec, RebbitMQ, Sidekiq, Rollbar, AWS S3, DynamoDB.

Kyiv, Ukraine

Developed and maintained crime reporting social network (Facewatch). Refactoring hierarchical system of groups of premises to resolve performance issues. Refactoring and extending email notification system, creating integration automated tests. Development of a public portal for reporting crime directly to the police.Database design and creation premisses vulnerability assessment forms (VSAT) API.Created an internal vacation management system for employees using Elixir.Developed Mobile Content Manager for Four Seasons.Created Publisher Hub API – a reporting system for DoubleClick and YouTube advertising publishers.Technologies: Ruby, Ruby on Rails, Sinatra, PostgreSQL, MySQL, Elixir/Phoenix.

Kyiv, Ukraine

Development of multi-page forms. Setting up authentication via Facebook and Twitter. A/B testing setup. PDF report generation. Creating an admin panel for selecting users into groups based on dynamic conditions for email notifications.Technologies: Ruby on Rails, PostgreSQL, Sidekiq, RSpec, Cucumber, Capybara, Selenium, Errbit, jQuery, Bootstrap, OAuth.

Kyiv, Ukraine

Support and development of the statistical application – Reevoo Analytics. Aggregating data by month/date. Checking data accuracy and relevance.Technologies: Ruby on Rails, MySQL, PostgreSQL, Highcharts, Google Analytics API.

Kyiv, Ukraine

Support and development of the statistical application – Reevoo Analytics. Aggregating data by month/date. Checking data accuracy and relevance.Technologies: Ruby on Rails, MySQL, PostgreSQL, Highcharts, Google Analytics API.

Kyiv, Ukraine

Real estate ads website support. Automation of data import from real estate agencies. Creation of a web form for placing an ad in print media. Generation of reports on median real estate prices. Creating API for mobile apps and external consumers.Technologies: PHP, MySQL, jQuery, XML, Yii PHP Framework

Kyiv, Ukraine

Creating front-end GIS application based on ArcGIS server. The service was used by the internal affairs bodies of Ukraine in Kyiv for patrol car monitoring and to view statistics of crimes by city districts.Created web versions of interactive educational applications in geography and history for students which contain educational materials, including maps and tests.Also created the company's corporate website.Technologies: PHP, MySQL, JavaScript.

Kyiv, Ukraine

Websites and design development.Technologies: PHP, MySQL, JavaScript, Smarty templates.