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Marius Martinonis

Software
Engineer

Backend engineer with production experience in AI systems, API design, and full-stack web development. Builds across system architecture, automation pipelines, and scalable web platforms.

Focused on AI automation and backend infrastructure — software engineered for reliability, performance, and intelligent decision-making at scale.

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LocationLithuania, EU
EmploymentFull-time
AvailabilityAvailable for selected freelance projects
Focus areasBackend systems · AI automation · APIs
01 — Technical Skills
Languages
  • JavaScript / TypeScript
  • Python
  • PHP
  • C#
Backend
  • Node.js
  • Express.js
  • REST APIs
  • Authentication systems
Frontend
  • React
  • Next.js
  • Nuxt.js
Databases & Services
  • MongoDB
  • MySQL
  • Firebase
  • Qdrant (Vector Database)
AI & Data
  • Natural Language Processing
  • Embeddings
  • OpenAI API integration
  • AI workflow automation
Infrastructure
  • Linux
  • Docker
  • Kubernetes
02 — Selected Projects
  • 012026

    Lumen AI

    AI

    AI-powered platform built in TypeScript — an intelligent product designed to surface insights and automate decision-making through modern language model integration.

    TypeScript · Node.js · OpenAI API

  • 022026

    Fitfelo

    Mobile App

    An AI-powered nutrition tracker that removes the friction from food logging — photograph a meal, describe it in words, or scan a barcode, and get an instant calorie and macro breakdown.

    React Native · Expo · TypeScript · Supabase · OpenAI API

  • 032024

    CDN Server

    Infrastructure

    A self-hosted content delivery server built to distribute and serve static assets at scale — handling uploads, caching, versioning, and high-throughput file delivery.

    Node.js · Linux · Nginx

  • 042025

    Driver Schedule System

    Web App

    A scheduling and dispatch management system for driver operations — handling route assignment, shift planning, and real-time schedule coordination.

    JavaScript · Node.js · REST API

  • 052026

    Discord Ticket System

    Automation

    A full-featured Discord support ticket bot for Vimo.lt — handling ticket creation, staff assignment, transcript logging, and closure workflows.

    JavaScript · Discord.js · Node.js

  • 062025

    Item Description AI

    AI

    A full-stack SaaS platform that turns product photos into ready-to-list e-commerce copy — GPT-4.1-mini vision identifies the item, optional web enrichment fills in verified details, and the result ships as structured, marketplace-ready fields.

    Node.js · Express · Vue.js · MongoDB · Stripe · OpenAI

03 — Contact

Available for selected freelance projects.

GitHubLinkedIn

Based in Lithuania — open to remote collaboration.

Type of workBackend systems · AI automation · APIs
EngagementConsulting · Short-term contracts
Response timeWithin 48 hours