Marius MariakinasAI Senior Software Architect and Technical Lead

Ideas into
working
software.

I build web and mobile products from the ground up, owning architecture, backend systems, AI integrations and production delivery.

Explore my work Let’s talk

Ask about Marius

AI guide to his work & experience

14+ years building production systems

  1. Design

    Turn your goals into a clear plan and an intuitive interface.

  2. Build

    Connect the interface, business logic and data into a working product.

  3. Deploy

    Take your product into production, ready for real users.

  4. Maintain

    Monitor, improve and keep your system running reliably.

Selected work

Built for real life.

Phuket Tourist web app with local events and places to discoverPhuket Tourist mobile app
Web + Mobile App

Phuket Tourist

An entire island, in your pocket. Local discovery, live events and a day-by-day planner, connected by a type-safe API.

React NativeExpoTypeScriptFastify
Zipp parcel delivery app, screen 1Zipp parcel delivery app, screen 5
Mobile App

Zipp

From pickup to doorstep. A parcel delivery marketplace with live tracking, negotiated prices and integrated payments.

React NativeExpoTypeScriptFastify
Memowrite book cover designer
Web + Admin

Memowrite

Life stories, made into books. Guided writing, AI refinement and print-on-demand, in one complete product.

Next.jsReactFastifyTypeScript
ChargeShare EV charging app, screen 1ChargeShare EV charging app, screen 6
Mobile App + Web Admin

ChargeShare

A better way to plug in. An EV charging marketplace connecting drivers with hosts, real availability and secure payments.

React NativeExpoTypeScriptFastify

More engineering work

Gamified AI LearningNext.js · React · TypeScriptWeb AppTrashSignalNext.js · Bun · ElysiaWeb + Admin + APIPayment Gateway IntegrationsNode.js · Fastify · PostgreSQLAPI + DashboardAutomation SystemNode.js · Workers · FastifyBackend + DashboardGovernment Resources ManagementNode.js · Fastify · PostgreSQLWeb AppRestaurant Operations SuiteReact Native · Next.js · FastifyMobile + Web Admin
About

I design it.
Then I build it.

I’m a hands-on software architect and technical lead with 14+ years of experience across banking, business software, e-commerce and mobile products.

I design and build products from scratch, from data models, APIs and authentication to integrations and production delivery. I combine full-stack implementation with technical direction, developer mentoring and modernisation of existing systems.

I integrate AI into customer-facing products, including writing and editing, chat, image generation and speech. I also build tools to assign tasks to coding and custom AI agents, monitor their progress, issue commands and coordinate multiple agents across development workflows.

Frontend

TypeScript · React · Next · TanStack Start · Solid

Mobile

React Native · Expo · iOS | Android

Backend

Node · Bun · Fastify · Elysia · Hono · Rust

Data

PostgreSQL · Drizzle ORM · Kysely · Redis · BullMQ

AI integration

OpenAI · Google Gemini · Anthropic Claude · xAI Grok · Agent orchestration

APIs

REST · GraphQL · WebSockets

Quality

Vitest · Playwright

Delivery

Linux · NGINX · Railway · GCP

Infra & Services

Git · Cloudflare · Stripe · CI/CD · Docker

Open source

Made to be shared.

@MariuzM

win-utils

4

Windows 11 tweaking utilities in C# / .NET 9 — debloat, privacy, performance, and a Win32 taskbar prototype

C#Source ↗

mac-utils

1

Native SwiftUI app that scans your Mac and every mounted volume for removable files — caches, logs, trash, developer junk, temp files. Review, back up, or delete.

SwiftSource ↗

mac-stats-menu

2

A tiny, low-resource macOS menu bar system monitor (CPU/Memory/GPU/Network) — a simpler, lighter alternative to iStat Menus.

SwiftSource ↗

quicksource

1

Syntax-highlighted Quick Look previews for developer files on macOS.

SwiftSource ↗

stop-tahoe-updates

2

macOS menu-bar app that blocks the macOS Tahoe upgrade while keeping app and security updates enabled

SwiftSource ↗
Show all 10 repositoriesShow fewer

statement-reader

1

Local-first earnings dashboard for bank statement (Revolut CSV) exports — TanStack Start + React 19, Tailwind v4; all parsing runs in-browser, nothing uploaded.

TypeScriptLive demo ↗Source ↗

vrr-flicker-test

1

C++ tool (Dear ImGui + GLFW/OpenGL) for testing monitor tearing and VRR flicker at variable refresh rates

MakefileSource ↗

bench

1

Head-to-head benchmarks comparing C, C++, Jai, JavaScript, Odin, Rust and Zig on speed, memory, binary size, compile time and source size across thirteen workloads.

RustSource ↗

learning-archive

Personal archive of learning projects and experiments across React, React Native/Expo, Next.js, Node/Bun, TypeScript, Go, Rust, C++, Zig, Jai, WASM, and Web3.

TypeScriptSource ↗
Contact

Something
in mind?

Tell me what you’re building.
Let’s figure out how to make it work.

info@marius.dev I usually reply within a day.