Get To Know

About Me

Experience
4+ Years Working
Clients
100+ Worldwide
Projects
10+ Completed

I am a full-stack engineer focused on building production-ready web and hybrid applications. My work spans frontend architecture, backend API design, cloud infrastructure, and CI/CD automation.

Beyond web systems, I extend applications into desktop and mobile environments — building Electron-based desktop apps and packaging hybrid applications for both iOS (.ipa) and Android (.apk). I work with CI pipelines (GitHub Actions) to automate cross-platform build workflows.

I enjoy designing systems that are not only functional, but structured, scalable, and deployment-ready.

Technical Expertise

Engineering Experience

Engineering Foundations

Git (branching strategies, remote workflows)

Applied

Linux CLI & Server Environments

Applied

SSH Workflows & Remote Administration

Applied

System-Level Debugging & Problem Solving

Applied

Frontend Engineering

React / Next.js

Experience

TypeScript (ES6+)

Experience

Component Architecture & State Design

Experience

Responsive UI (Tailwind, Bootstrap)

Experience

Performance-Oriented UI Thinking

Experience

Backend & API Architecture

Node.js / Express

Applied

Python (FastAPI)

Applied

Laravel (PHP)

Applied

REST API Design & Integration

Applied

Authentication & Backend Structure

Applied

Database Modeling (MySQL, PostgreSQL)

Applied

Database Engineering

MySQL (Schema Design & Query Optimization)

Applied

PostgreSQL

Applied

Oracle Database

Applied

MongoDB (NoSQL Concepts)

Applied

Firebase (Cloud Data Integration)

Applied

Relational Modeling & Data Structuring

Applied

Neon (Serverless PostgreSQL)

Applied

Hybrid & Mobile Engineering

Electron (Desktop Applications)

Applied

Web-to-Desktop Packaging (.exe)

Applied

Capacitor (Web → iOS Integration)

Applied

iOS Application Builds (.ipa)

Applied

CI/CD for iOS (GitHub Actions + macOS runners)

Applied

App Store / TestFlight Deployment Workflow

Applied

Android & Mobile Development

Java (OOP, Android APIs)

Applied

Android Studio (IDE & Emulator)

Applied

Android Application Builds (.apk)

Applied

Activity & Fragment Lifecycle

Applied

Android SDK & Gradle Configuration

Applied

Google Play Deployment Workflow

Applied

Cloud & DevOps

Oracle Cloud Infrastructure

Applied

Server Provisioning & Configuration

Applied

CI/CD Pipelines (GitHub Actions)

Applied

Automated Build Workflows (Web & iOS)

Applied

Environment Variables & Secrets Management

Applied

Production Deployment Practices

Applied

Docker (Containerization & Service Deployment)

Applied

DNS Filtering & Network Security (AdGuard Home)

Applied

AI & Automation Engineering

OpenClaw AI Agent Deployment & Configuration

Applied

Self-Hosted AI Gateway (VPS + systemd)

Applied

WhatsApp Bot Integration (Multi-language)

Applied

LLM API Integration (OpenRouter, Anthropic)

Applied

Email Automation via CLI (himalaya / IMAP/SMTP)

Applied

AI Agent Skill Configuration & Prompt Engineering

Applied

Secure Agent Access Control & Policy Management

Applied

Marketing & Growth Tools

Brevo (Email Marketing & Subscriber Management)

Applied

Google Analytics 4 (Traffic & User Behavior)

Applied

Cron-job.org (Automated Scheduled Tasks)

Applied

Newsletter Campaigns & Audience Segmentation

Applied

Agile & Scrum Methodology

Agile Principles & Iterative Development

Applied

Scrum Framework (Sprints, Ceremonies)

Applied

Sprint Planning & Backlog Refinement

Applied

Daily Standups & Retrospectives

Applied

User Stories & Acceptance Criteria

Applied

Kanban Boards (Jira / GitHub Projects)

Applied

Systems & Security Awareness

HTTPS & TLS Concepts

Applied / Learning

MITM & Attack Surface Awareness

Applied / Learning

Backend Exposure Risk Analysis

Applied / Learning

Security-Oriented System Thinking

Applied / Learning

DNS-Level Network Protection

Applied / Learning
What I Provide

Engineering Services

Full-Stack Web Engineering

  • Frontend architecture (React, Next.js, TypeScript)

  • Backend API development (Node.js, FastAPI, Laravel)

  • Database modeling (MySQL, PostgreSQL, MongoDB)

  • Authentication, security & production-ready structure

Cross-Platform Applications

  • Desktop apps with Electron (.exe builds)

  • Android signed release builds (.apk)

  • iOS build workflows (.ipa via CI/CD)

  • App Store / TestFlight deployment setup

Cloud & Deployment

  • Oracle Cloud server configuration

  • CI/CD automation (GitHub Actions)

  • Environment variables & secrets management

  • Production deployment & hosting strategy

Technical UI & System Design

  • Performance-oriented UI architecture

  • Responsive layouts (Tailwind / Bootstrap)

  • Minimalist, structured UX thinking

  • Security-aware frontend & backend integration

My Recent Work

Portfolio

Cheerful Horse Android educational game developed by Full Stack Developer Mantas Počiuipa

Cheerful Horse on Android

Cheerful Horse is an educational Android game developed by Full Stack Developer Mantas Počiuipa. The application demonstrates responsive mobile development, optimized graphics, intuitive gameplay and modern JavaScript programming techniques. It is designed for Android devices and showcases practical experience in software development, UI design and mobile application architecture.

GitHubBuy
Cheerful Horse Windows desktop game developed by Full Stack Developer Mantas Počiuipa

Cheerful Horse on Windows

Cheerful Horse for Windows is a desktop version built for Microsoft Windows. The project demonstrates cross-platform software development, responsive user interface design, optimized performance and modern application architecture using current web technologies.

GitHubBuy
Crimson Sky Firestorm Arena Windows action game created by Mantas Počiuipa

Crimson Sky Firestorm Arena on Windows

Crimson Sky Firestorm Arena is a 3D action game for Windows featuring immersive gameplay, optimized graphics, interactive environments and smooth performance. The project showcases real-time rendering techniques, game mechanics and desktop software engineering.

GitHubBuy
3D Race Game for Windows developed using React and Three.js by Mantas Počiuipa

3D Race Game on Windows

3D Race Game for Windows demonstrates advanced React development, Three.js rendering, optimized physics simulation and desktop application deployment. The project highlights modern game development techniques and interactive graphics.

GitHubBuy
3D Race Game for Android developed using React and Three.js by Mantas Počiuipa

3D Race Game on Android

3D Race Game for Android is a mobile racing experience optimized for smartphones and tablets. The application focuses on responsive controls, optimized rendering, smooth animations and cross-platform compatibility.

GitHubBuy
House Construction application for Lithuanian users

House Construction App for Lithuania

House Construction App helps users plan and manage residential construction projects. The software provides practical tools for budgeting, planning, organization and project management for homeowners and builders.

GitHubBuy
House Construction desktop software for Windows

House Construction Desktop Software

House Construction Desktop Software extends the construction planning system to Windows users by providing an optimized desktop interface, advanced project management capabilities and intuitive navigation.

GitHubBuy
JavaScript Python and Database learning platform

JavaScript, Python & Database Course

The JavaScript, Python and Database Course is a programming education platform created to help users learn modern software development concepts. The course covers JavaScript programming, Python fundamentals, databases, programming logic and practical development skills.

GitHubBuy
Linux training course for Windows users

Linux Training for Windows Users

Linux Training for Windows Users is an educational platform designed to introduce Linux operating systems, command line tools, system administration concepts and practical cybersecurity fundamentals for beginners.

GitHubBuy
Crimson Sky Firestorm Arena Android game

Crimson Sky Firestorm Arena on Android

Crimson Sky Firestorm Arena Android version brings an action game experience to mobile devices. The project demonstrates mobile optimization, responsive gameplay, interactive graphics and cross-platform game development.

GitHubBuy
Health Manager desktop application for Windows

Health Manager Desktop Application

Health Manager is a Windows desktop application designed to help users organize and manage health-related information. The project demonstrates software architecture, user interface development and practical desktop application engineering.

GitHubBuy
What People Say

Testimonials

Austėris Žvaigždūnas
Austėris Žvaigždūnas
Product Lead

"Mantas combines deep technical skill with systems thinking. He approaches development not just as coding, but as architecture and long-term scalability."

Rytvydas Šilnaitis
Rytvydas Šilnaitis
Creative Director

"His projects demonstrate strong UX awareness and structured component design. Performance, fallback logic and user flow are clearly intentional."

Vėjūnė Gintarėlaitė
Vėjūnė Gintarėlaitė
Mobile Consultant

"Cross-platform capability stands out. From web to Android builds and deployment workflows, his technical maturity is evident."

Ąžuorimas Rasvydis
Ąžuorimas Rasvydis
UX Strategist

"He consistently asks not only how to build, but how to build better. System clarity and user experience are always part of his process."

Saulmirė Vėjūnaitė
Saulmirė Vėjūnaitė
Technical Advisor

"Strong learning mindset and resilience. Handles technical issues methodically and improves through iteration."

Get In Touch

Contact Me