Skills — Liviu Dumitru

Frontend

Front-End Development

HTML & CSS

Proficient in structuring and styling web pages using ERB, HAML, and Liquid templates. Extensive experience with semantic HTML and modern CSS techniques.

JavaScript

Strong understanding of core JavaScript concepts including ES6+, async/await, DOM manipulation, and event-driven patterns.

Frontend Frameworks

Bootstrap 5 for responsive UI. Experience with Turbo (Hotwire) for SPA-like interactions without heavy JavaScript frameworks.

Responsive Design

Mobile-first, responsive layouts that adapt cleanly across screen sizes. Fluent in CSS Grid, Flexbox, and media queries.

CSS Preprocessors

Experience with Sass/SCSS for maintainable stylesheets. CSS variable systems for consistent design tokens across large applications.

Version Control

Git workflows — branching strategies, pull requests, code reviews. Experience with GitHub and GitLab including CI/CD pipelines.

Frontend Stack

HTML5 CSS3 Sass/SCSS JavaScript ES6+ Bootstrap 5 Hotwire Turbo Stimulus ERB HAML Liquid Responsive Design Git / GitHub

Backend

Back-End Development

Ruby on Rails

Primary backend framework. Full command of Rails 7 — models, controllers, routing, ActiveRecord Encryption, background jobs, Action Mailer, Action Cable, and API mode.

PHP

Proficient in PHP for server-side scripting and CMS customization. Experience building standalone PHP applications and REST APIs.

Databases

PostgreSQL and MySQL for relational data. MongoDB for document-based storage. Schema design, migrations, indexing, and query optimization.

API Design

RESTful API architecture. Redis for caching and pub/sub. Sidekiq for background processing. Action Cable for WebSocket-based real-time features.

Auth & Security

Devise, JWT, and OAuth. Two-factor authentication (TOTP + OTP). AES-256 data encryption. XSS, CSRF, SQL injection protection. Secure session management.

Web Servers

Ubuntu and Alma Linux server administration. Apache and Nginx configuration and performance tuning. SSL/TLS setup and maintenance.

Backend Stack

Ruby on Rails 7 PHP PostgreSQL MySQL MongoDB Redis Sidekiq Action Cable Devise JWT OAuth AES-256 REST APIs Nginx Apache Ubuntu Alma Linux

DevOps

DevOps & Infrastructure

Docker — containerized application deployment
CI/CD — GitLab CI pipelines
Cloud platforms — AWS, Google Cloud, Azure
Bash scripting for automation and server tasks
Git workflows, branching, pull requests, code review
Server self-management — Linux, Nginx, Apache

Mobile & Hardware

Mobile & Embedded

Turbo Native iOS and Android (Hotwire)
Kiosk device software development
Microcontroller and sensor programming
3D modeling and 3D printing for hardware projects
Blockchain and crypto payment integrations
Python scripting for controllers and automation

Additional

Bonus Skills

Unit testing, integration testing, debugging

Turbo Streams and Turbo Morphing

Bash scripting

Blockchain & crypto payment integrations

Python scripting for controllers and sensors

Kiosk device software development

Collaboration

Soft Skills

Problem-solving and creative technical thinking

Clear communication with teams and stakeholders

Agile teamwork — stand-ups, sprint planning, retrospectives

Project management tools — Trello, Asana

Adaptability — fast learner across any language or GUI framework

Architecture thinking — understanding complex project structures

Technical Skills