Senior Full-Stack Developer

I build production software across web, backend and mobile.

5+ years of experience building and operating production software, working closely with clients and taking products from requirements to implementation.

Focus: Full-stack · Mobile · AI
Location: Based in Hungary · Working internationally

Selected projects LinkedIn GitHub CV

Selected projects

Products I've helped shape, build and operate.

Home Assistance Platform

An Uber-style home assistance platform coordinating lockout requests across customers, field teams and operators. I work across frontend, backend, infrastructure, delivery and direct client communication.

Role: Software Developer / Full-stack Engineer
Key contributions: Built and maintained four React and TypeScript frontends backed by a shared component library
Developed Node.js and Koa services, API integrations and production data flows
Supported a Go synchronization microservice that moves data from an outbound service into the platform
Managed Docker hosting, an Nginx reverse proxy, deployment pipelines, a self-hosted GitHub Actions runner and a private container registry
Started the migration toward a cloud-ready 12-factor architecture
Maintained Cypress test coverage, dependencies and production security
Clarified requirements directly with the client, translated them for the team and contributed to future development proposals

Technology: React · TypeScript · Vite · Node.js · Koa · Go · PostgreSQL · Docker · Nginx · GitHub Actions · Cypress

Nativo

A language-learning application that turns voice recordings or written text into natural phrasing, reusable expressions and personal lessons based on the learner's real life.

Role: Creator / Full-stack Software Engineer
Key contributions: Designed the core product experience around personal language practice
Built web and mobile learning flows from early concept to production-ready implementation
Developed account, entitlement and subscription foundations for a commercial product
Created learning history, continuity and progress surfaces that support repeat usage
Shipped the iOS application and prepared the product for an App Store-based launch path
Own product design, engineering, deployment, QA and operations end to end

Technology: React · React Native · TypeScript · Backend systems · AI product development · Payments · Production operations

View project

Padel Booking Platform

An end-to-end platform for a padel club with court booking, payments, invoicing, administration and player rankings. I designed, built, deployed and operate the product independently.

Role: Creator / Full-stack Software Engineer
Key contributions: Designed and built the React and TypeScript frontend and the Node.js and NestJS backend
Implemented court booking, availability and calendar workflows
Built custom authentication, user management, admin tools and a statistics dashboard
Added player rankings and match-result recording
Integrated Stripe payments, Számlázz.hu invoicing and transactional email
Containerized the services and automated deployment with GitHub Actions

Technology: React · Next.js · TypeScript · Node.js · NestJS · Prisma · PostgreSQL · Stripe · Számlázz.hu API · Docker · GitHub Actions

View project

Banking Analytics Platform

An analytics platform benchmarking financial institutions across multiple criteria to provide data-driven assessments and industry insights. My work covered frontend, mobile, data visualisation, CMS integration, AI functionality and selected backend work.

Role: Software Developer
Key contributions: Scalable React frontend functionality and interactive financial-data visualisations
React Native implementation of the product
Backend contributions in Go
Strapi CMS integration over GraphQL, including multilingual content
RAG chatbot with OpenAI / LLM integration

Technology: TypeScript · React · React Native · Gatsby · GraphQL · Strapi · Go · Docker · OpenAI / LLM · RAG

Logistics Workspace Platform

June 2025 - October 2025

A modular internal platform that brings operational tools and service workflows into one coherent experience, built around a central shell integrating multiple microfrontends and web components.

Role: Software Developer
Key contributions: Built frontend microservices with React, TypeScript and Web Components
Embedded microfrontends into host applications with consistent communication and UX
Created a Tailwind CSS design system and shared component library
Delivered responsive, real-time interfaces and AI-assisted autocomplete
Integrated TanStack Query and streaming APIs with Node.js services
Managed the GitLab validation and deployment pipeline

Technology: TypeScript · React · Vite · Web Components · Microfrontends · Tailwind CSS · TanStack Query · Node.js · PostgreSQL · Docker · GitLab CI/CD

About

Creative thinking, simple solutions.

I started in frontend engineering, building web products with React and TypeScript. Curiosity soon pulled me deeper into backend, mobile, infrastructure and architecture.

Today I work across the product, from shaping requirements to shipping and operating it. I enjoy turning unclear problems into practical solutions quickly, and I communicate directly with clients when that helps us move.

I bring a creative mindset, but I keep the implementation simple. Good software should be clear, maintainable and solve the real problem without unnecessary complexity.

AI is part of my daily engineering workflow and the products I build. I use it to explore ideas, move faster and create useful features without losing technical judgment.

Experience

Professional background.

2024 - Present
AOE Group
Senior Software Developer
2022 - 2024
Finnoconsult
Software Developer
2021 - 2022
International Institute for Applied Systems Analysis (IIASA)
Software Developer - Research Collaboration
2020 - Present
Independent Software Developer
Selected product and client work
Developed selected web and mobile products, including Nativo, Padel Sopron, Peertix and other services, covering product design, implementation, integrations and deployment.

Education

2018 - 2022
University of Sopron
BSc in Computer Science

View / download CV

Expertise

What I work with.

Frontend: React · Next.js · TypeScript · Vite · Tailwind CSS · TanStack Query
Backend: Node.js · Fastify · Express · Koa · NestJS · PostgreSQL · Prisma
Mobile: React Native · Expo · iOS · Android
Platform: Docker · GitHub Actions · GitLab CI/CD · Git · Observability
Testing: Playwright · Cypress · Vitest / Jest · Integration testing · E2E testing
AI: AI-assisted development · Claude · Cursor · Codex · LLM integration · RAG · Prompt & context engineering · Agents · MCP
Additional: GraphQL · Strapi · Firebase · REST / OpenAPI

Contact

Have something interesting to build? Let’s talk.

phollakos15@gmail.com LinkedIn GitHub

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Operator: Puteáni-Holl Ákos, 9400 Sopron, Hungary. Legal contact: phollakos15@gmail.com.