Marius Mariakinas
Full Stack Engineer
I build production web and mobile systems for businesses — end-to-end.
12+ years of experience · CMS & ERP platforms · Web | Mobile | Servers | DevOps
About
For 12+ years I've been building production IT systems for businesses — mostly CMS and ERP style platforms across web, mobile, backend, and DevOps.
I operate as the systems architect: I translate business requirements into technical solutions, make the critical decisions on structure and strategy, and look after the full lifecycle from planning to deployment and monitoring — collaborating with designers, product managers, and other engineers to ship reliable features quickly.
Below are a few client projects I delivered end-to-end as a solo developer that are running in production today. Some are under NDA, so I can't share names or screenshots, but I can walk through the problems, architecture, and outcomes.
Client Work
Package Delivery Marketplace
Built a peer-to-peer package delivery platform operating in Lithuania that connects senders with drivers, functioning as an Uber-style marketplace for local parcel delivery. The app is bilingual (English/Lithuanian) and uses EUR currency.
Book Writing Platform
Built a full-stack personalized memoir creation and book printing platform that helps users preserve life stories through guided questions, AI-powered writing refinement, and professionally printed hardcover books.
AI Learning Platform
Built a full-stack educational platform that combines structured AI learning challenges with an interactive AI playground, enabling users to learn artificial intelligence through gamified courses and hands-on experimentation with multiple AI models.
EV Charging Platform
Built a full-stack marketplace connecting electric vehicle owners who need charging with hosts who have chargers available. Users discover nearby chargers on an interactive map, match with hosts, book time slots, and pay securely in real-time.
Payment Gateway Integrations
Built a unified payment orchestration layer that abstracts multiple third-party payment providers behind a single API, supporting multi-currency transactions and provider failover.
Automation System
Built a high-throughput automation platform that leverages an external AI service for market-trend analysis, processing 30k-150k messages under load with reliable job queuing and two independently deployable backend services.
Government Resources Management
Built an internal management system for government agencies to track contractor costs and monitor delivered services across multiple sectors with strict role-based access control.
Restaurant Management Platform
Built a full-stack restaurant operations platform covering everything from table and order management to a customer-facing mobile app for browsing menus, placing orders, and tracking them in real time.