Marius Mariakinas

Full Stack Engineer (Web and Mobile Apps)

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, making the critical decisions on structure and strategy to ensure the product app is scalable, secure, and maintainable, i look after the full lifecycle from planning to deployment and monitoring, end-to-end.

I collaborate with designers, product/project managers, and other engineers to ship reliable features quickly, adapting to each team's budget and delivery process.

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.

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Stack

Web

Next,React,TailwindCSS,Material UI,Mantine UI,Chakra UI,TypeScript,Rest,GraphQL,Forms & Form Validations,Date Range Pickers,State Management,HTML,CSS,JS

Mobile (iOS & Android)

React Native,Expo,TypeScript,Notifications,Apple App Store,Google Play Store,Local Storages

Server

Node,Fastify,Express,Bun,Elysia,Hono,TypeScript,Rest API,GraphQL,WebSockets,Route Security,PostgreSQL,Drizzle ORM,Kysely

DevOps

Railway,Cloudflare,Firebase,GCP,Heroku,Vercel,CI/CD,Docker,GitHub,BitBucket,GitLab

Client Work

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.

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Next.jsReactZustandTailwind CSSReact Hook FormZodi18nextFastifyTypeScriptPostgreSQLDrizzle ORMKyselyBetter AuthBunFirebase StorageNodemailerReact EmailSentryPDF-libSharpOpenAIGoogle GeminiPicWishRPI PrintStripe-like Paymentsn8n
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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.

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Next.jsReactTypeScriptFirebase (Auth, Firestore, Storage)Tailwind CSSZustandRadix UIZod
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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.

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React Native (Expo)ReactFastifyPostgreSQLSocket.ioStripeMapboxAWS S3Firebase
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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.

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Node.jsFastifyPostgreSQLVitestReact Testing LibraryPlaywrightReact
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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.

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Node.jsWorkersReactFastifyPostgreSQLRedis BullMQVitestPlaywright
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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.

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Node.jsFastifyPostgreSQLReact
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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.

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React NativeNext.jsNode.jsFastifyPostgreSQLWebSocketsStripe
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