Lefteris Evangelinos

Full-Stack Developer & Software Engineer

Building scalable backend systems, real-time applications, and automation tools. Passionate about clean architecture, modern web technologies, and solving complex problems with elegant code.

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Lefteris Evangelinos

Technical Expertise

Backend Development

  • Node.js & Express
  • NestJS & TypeScript
  • REST & WebSocket APIs
  • MySQL & Sequelize ORM
  • JWT Authentication
  • Real-time Systems (Socket.IO)

DevOps & Tools

  • Git & Version Control
  • Redis Caching
  • Firebase Cloud Messaging
  • Prometheus & Sentry
  • Scheduled Jobs & Automation
  • Docker & Deployment

Languages & Frameworks

  • JavaScript/Node.js
  • Python
  • Astro & Modern Web
  • Vue.js
  • SQL & Database Design

Featured Projects

Note: Due to confidentiality agreements with clients and employers, not all projects I've contributed to can be publicly shared. The projects showcased here represent a selection of my publicly available work that demonstrates my technical capabilities and approach to problem-solving.

OmniSSH

High-performance, privacy-first desktop workspace for SSH terminals, SFTP/SCP dual-pane file management, S3 cloud storage, and multi-source connection imports. Built with Tauri v2, Rust, and React 19.

  • Tauri v2
  • Rust
  • React 19
  • SSH/SFTP
  • xterm.js
Learn More →

Token Optimizer

Intelligent MCP server that compresses verbose build, lint, and test diagnostics into compact, actionable verdicts for AI coding agents, slashing context token consumption.

  • TypeScript
  • MCP
  • AI Tooling
  • CLI Installer
Learn More →

Paseo Antigravity CLI

Paseo provider plugin integrating Google's official Antigravity CLI (`agy`) over NDJSON streaming. Powers subagent orchestration, plan mode, interactive questions, and quota management.

  • TypeScript
  • Node.js
  • Paseo
  • Antigravity CLI
  • Agentic AI
Learn More →

NestJS Backend Template

Production-ready NestJS template with JWT authentication, Swagger documentation, Prometheus metrics, Sentry error tracking, and comprehensive security features. Built with TypeScript and modern best practices.

  • NestJS
  • TypeScript
  • Prometheus
  • Swagger
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Share the Ride

Production-ready carpooling platform backend with JWT authentication, real-time chat, notifications, and scheduled maintenance jobs. Built with Node.js, Express, and Socket.IO.

  • Node.js
  • Express
  • Socket.IO
  • MySQL
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Web game

Real-time multiplayer game platform with Express.js backend and Vue 3 frontend. Features round-based gameplay, voting mechanics, admin dashboard, and comprehensive session management.

  • Vue 3
  • TypeScript
  • Express
  • Real-time
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Python Random Scripts

Collection of automation utilities and data-wrangling tools showcasing Python best practices, CLI patterns, and practical problem-solving approaches.

  • Python
  • Automation
  • CLI Tools
  • Data Processing
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SEO Optimizer

Standalone desktop SEO analysis and optimization tool with 13 SEO rules, 17 mini-services for keyword analysis, readability scoring, and content optimization. Built with Electron, React, and SQLite.

  • Electron
  • React
  • TypeScript
  • SEO Analysis
Learn More →

Editopia

Professional portfolio website for an editor, translator, and book reviewer. Modern, responsive design with Vue, optimized for SEO and showcasing editorial services.

  • Vue
  • TypeScript
  • Portfolio
  • SEO
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Team Management

Full-stack team tracking workspace with account isolation, project planning, task management, dashboards, calendar views, and secure email-based authentication flows.

  • React
  • Fastify
  • Prisma
  • PostgreSQL
Learn More →

Let's Build Something Together

I'm always interested in hearing about new projects and opportunities. Whether you have a question or just want to say hi, feel free to reach out.

Get in Touch