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Full Stack Ruby Developer - 23708
I’m from the Ukraine, Kyiv metropolitan area.
I have overall 18 years in the IT industry and 11 years in software development and development operations. I worked at product, outsourcing, and out-staffing companies which are present at the Ukrainian and global markets. I occupied the next positions of Networking Engineer, System Administrator, Software Engineer, Senior Systems Engineer, IT Department Lead. Industries where I did provide development services are Logistics, Financial technologies, E-commerce, Electronic education systems, psychological healthcare, entertainment, restaurants and hotels. Sometimes I'm developing open source software.
Also I’m developing my own projects, prototyping software architecture solutions, developing technical solutions for interesting engineering tasks, learning interesting and perspective for me technologies. Familiar with electronics, microcontrollers and development of firmware, using it as a hobby.
My technological expertise includes:
- Backend software development with Ruby and any Rack frameworks or built from scratch Rack applications, development of gems, libraries and utilities. My program code is written by best practices and style guides using Rubocop(for every technological part of application) and other required linting tools. I'm auditing code for security vulnerabilities and maintainability on a regular basis as part of my development cycle. Also I am able to use Python, Elixir, C/C++, Lua as secondary languages.
- Frontend software development with Node.js, JavaScript and nowaday transpillable languages such as EcmaScript 6 and 7, TypeScript. I'm using webpack, rollup, babel and any other bundlers, transpillers and asset compilers. Using ESLint, TSLint at my work.
- Development Operations and System Administration. At my work I'm using AWS, Heroku, Azure and other cloud solutions. I'm using Hashicorp Terraform for infrastructure provisioning, Ansible and shell script for deployment of system tasks and delivery of software building blocks to server, Capistrano and similar tools for application deployment to the server. Familiar with Kubernetes and Docker swarm container orchestrators. Familiar with virtualisation hypervisors such as libvirt, KVM, Zen, VMware vSphere, bhyve/xhyve. Familiar with next CI/CD tools: Github Actions, GitLab pipelines, CircleCI, Semaphore CI, Drone.io CI. I have experience of building bare metal virtualized clusters and physical networks within virtualized zones.
- Testing. I prefer to use RSpec or minitest for Ruby tests. Jest, Cypress or ViTest for JS testing. I'm implementing Unit tests, Acceptance tests, Requests tests, Integration and scenario tests, black-box tests.
- I prefer to cover applications as maximum as possible, but within adequate limits to not lose maintainability and scalability of the system.
- I am practicing Agile methodologies such as XP, Scrum, Kanban. Even for my own solo projects.
The company is a global producer of payment equipment, hardware, and software. A payment terminals, gateways and payment processing centres.
- Development of automated testing tools for payment card terminals, software, and hardware by RFCs and standards of customers and card holding organizations, such as Visa, MasterCard, Discovery, AMEX, Diners Club.
- Implementation of magnetic stripe and chip card data decoding for testing purposes
- Development of mock interfaces between test suite and payment terminals
- Development of transaction processing mocks and stubs.
- Covering of the features and hardware functionality tests by code
- Developments of lib for image(pictures in bitmap, vector, raster formats) recognition and analysis. Text recognition. Verification mechanisms between origin and actual screens
- Development of utilities for Hand-write signature recognition and expectation-based verification module at the test suite.
- Participating in the build process of the testing and staging-ready releases
- Programming of low-level interfaces based on the raw TCP messaging
- Technical documentation writing
- Payment card mocking tools
- Development of WebUI demonstration software for trading stands
- Debugging and bug fixing
- Multithreading implementation
- Marshaling implementation
IT infrastructure management and system administration of the Company. WMS integration, configuring and maintenance, deployment of corporate servers, hardware. Communication with customers, suppliers, and system integrators of the Company. Participated in QA processes as an owner of the Validations and Change Management Systems. Software development. Participated in the development of business processes of company.
Software developed at the company:
- Logistics Visual, Ruby on Rails-based
Web frontend system for products stock management. Includes: transport and warehouse documentation, Inventarisation and stock reporting,
stock locator, analytical reports, QA reports and statistics, Remote order placement from the web, other tools.
- Gatekeeper, Ruby on Rails-based
gatekeeping and transport management system. Includes: Scheduling of trucks, switching of the gate to receive/load products.
- JobProcessor, Ruby
Background job processing system developed on Ruby.
Automated processing of XML documents for QA status, batch and product goods management, replenishment management, priority management, secondary checks of operations that are done by the previous day, automated daily product stock calculations and early alarm of surpluses or shortages of stocks.
- Other small automation tools
A trading platform connecting producers of agricultural productions and tools with resellers, trading networks and end consumers.
Responsibilities
- Frontend development
- Backend development
- Deployment tools development
- Background jobs programming
- Ansible playbook development
- Dockerfiles development
- Worker replication logic development
- Debugging and bug fixing
Marketplace selling group discounts, discount coupons, promo actions for events, parties, clubs and other services and goods. E-commerce shop on top of a dropshiping suppliers.
- Extended pagination, added dynamic loading of products to the view using AJAX, by events.
- SEO automation improvements, OpenGraph meta tag updates
- Admin UI frontend development
- Sidekiq background jobs development
- Product importer and synchronisation module development. The data source is a streamable, serialised XML data. Implemented batch processing of hundreds of thousands of goods by batches on daily basis, pre-filtration of absent products.
- API interfaces for communication with external data sources, like Hubber.io, FourSquare, Facebook, etc..
- Product view development
- Debugging and bug fixing
Psychological E-learning system
Interactive E-learning system providing a guideline, materials, testing tools, questionaries, diaries, schedulers for a therapist to effectively help for different range of people who have a need in psychological help or simply want to increase the level of quality of life. The main target customers are the German and worldwide corporate segment.
Responsibilities
- Full stack development
- Ruby backend development, hanami, dry-rb
- React.js frontend development
- API endpoints development
- RSpec test coverage
- Debugging and bug fixing
Large-scale fintech solution.
Responsibilities
- Kubernetes templates development
- Automation of development of Kubernetes deployments, templating, development of Terraform-compatible generators, using YTT(starlark), bash.
- Kubernetes deployments integration to the automated deployment system inside of Terraform provisioning to the AWS.
- Network Inbound/Outbound rules configuring
- Security configuration design
- Firewall config
Software development, consulting and prototyping.
- Consultations at building of automated deployment tools built with Ruby.
- Building architecture prototype with Ruby on Rails + Backbone and Marionette frameworks.
Private club for famous people. Entertainment, restaurants and hotels. From United Kingdom, working worldwide.
Ruby Rack backend application
VueJS 2 internal frontend applications.
Set of satellite applications and services
Complex object-oriented representation of a business processes inside of enterprise grade integrated IT environment.
Containerised development
and runtime environment.
TDD using RSpec, Cypress
Distributed systems.
Backend:
- Development of features; Implementing object-oriented model
- Refactoring
- Development of specs with RSpec;
- Documenting technical solutions and defining requirements through proposals on change procedure
- Debugging, analysis of issues delivered from support team; Debugging error notifications from bug/error trackers;
- Security and vulnerability automated audit, dependency version management, updates
Frontend:
- Implementation of new features
- Development of custom UI components at the Javascript and Typescript libraries.
- Debugging frontend application
- Error analysis and fixing
- Unit and End-to-End testing
Process:
- New feature development through RFC similar process
- Creating technical requirements and solutions
- Technical documentation writing
- Participating in meetings, planning, grooming, retro and other events related to the Kan-Ban development process
- Daily stand-ups
- Code review
- Pull request review and approvement
Development of parts of API SaaS system.
Freelance.
Open source projects.
Self education and trainings.