win-utils
4Windows 11 tweaking utilities in C# / .NET 9 — debloat, privacy, performance, and a Win32 taskbar prototype
Marius MariakinasSenior 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.
14+ years building production systems
Design
Turn your goals into a clear plan and an intuitive interface.
Build
Connect the interface, business logic and data into a working product.
Deploy
Take your product into production, ready for real users.
Maintain
Monitor, improve and keep your system running reliably.
Built for real life.
Web platforms. Mobile products.
Everything that makes them work.
Phuket Tourist
An entire island, in your pocket. Local discovery, live events and a day-by-day planner, connected by a type-safe API.
Explore project
Zipp
From pickup to doorstep. A parcel delivery marketplace with live tracking, negotiated prices and integrated payments.
Explore project
Memowrite
Life stories, made into books. Guided writing, AI refinement and print-on-demand, in one complete product.
Explore project
ChargeShare
A better way to plug in. An EV charging marketplace connecting drivers with hosts, real availability and secure payments.
Explore projectMore engineering work
05Gamified AI LearningNext.js · React · TypeScriptWeb App06TrashSignalWaste Reporting & Community CleanupWeb + API07Payment Gateway IntegrationsNode.js · Fastify · PostgreSQLAPI + Dashboard08Automation SystemNode.js · Workers · FastifyBackend + Dashboard09Government Resources ManagementNode.js · Fastify · PostgreSQLWeb App10Restaurant Operations SuiteReact Native · Next.js · FastifyMobile + Web AdminThe whole system.
The long view.
14+years of experience
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
Made to be shared.
mac-utils
1Native 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.
langpkg.dev
4Package discovery for the Jai and Odin programming languages.
mac-stats-menu
2A tiny, low-resource macOS menu bar system monitor (CPU/Memory/GPU/Network) — a simpler, lighter alternative to iStat Menus.
quicksource
1Syntax-highlighted Quick Look previews for developer files on macOS.
stop-tahoe-updates
2macOS menu-bar app that blocks the macOS Tahoe upgrade while keeping app and security updates enabled
statement-reader
1Local-first earnings dashboard for bank statement (Revolut CSV) exports — TanStack Start + React 19, Tailwind v4; all parsing runs in-browser, nothing uploaded.
vrr-flicker-test
1C++ tool (Dear ImGui + GLFW/OpenGL) for testing monitor tearing and VRR flicker at variable refresh rates
bench
1Head-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.
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.