09/08/2026 updated

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Principal Full Stack Engineer | React, TypeScript, Node.js, Cloud (AWS/Azure/GCP)

Budapest, Hungary
Only remote
BSc Mechatronics Engineering, Obuda University
Budapest, Hungary
Only remote
BSc Mechatronics Engineering, Obuda University

Profile attachments

akos-szabacsi-cv (2).pdf

JavaScriptAmazon CloudfrontCloud EngineeringNode.jsNext.jsTypeScriptBackendFull Stack DevelopmentGraphQLReact NativeFront End Software DevelopmentApi DesignNestJSTerraform
Full Stack Development with React and TypeScript
Extensive expertise in building modern frontend applications using React, TypeScript, Next.js, Vite, and Astro, combined with backend development using NestJS, Node.js, Express, and REST/GraphQL APIs. Delivery of scalable, test-driven, and maintainable full stack solutions across 13+ B2B client engagements.

Cloud-Native Architecture and Infrastructure as Code
Deep hands-on experience with multicloud platforms including AWS (Lambda, ECS, CloudFront, DynamoDB), Azure (AKS, Container Apps, Cosmos DB, Azure AI Search, Service Bus), and GCP (Cloud Run, Pub/Sub, Firestore). Infrastructure automation using Terraform, Docker, Kubernetes, and Ansible.

CI/CD and DevOps Engineering
Design and operation of CI/CD pipelines using GitHub Actions and CircleCI, including automated testing gates, Secret Manager, Artifact Registry, deployment automation, and EAS build and OTA pipelines for mobile applications.

Microfrontend and Monorepo Architecture
Proven experience designing and delivering microfrontend architectures and Nx monorepos, enabling modular, scalable, and independently deployable frontend systems across large enterprise projects.

GraphQL and API Design
Proficiency in GraphQL API design and integration using Apollo Client, Apollo GraphQL server, and OpenAPI specifications, supporting both frontend consumption and backend service contracts.

Testing and Quality Assurance
Application of automated testing strategies using React Testing Library, Playwright, Vitest, Jest, and Cypress, ensuring reliable delivery and high code quality across frontend and backend layers.

Headless CMS Integration
Experience integrating headless CMS platforms including Contentful, Strapi, and Sanity into modern JAMstack and component-driven frontend architectures for content-driven web applications.

AI and LLM Tooling
Practical experience with AI and LLM tooling including Google AI Studio, LangChain, and LLM app and agent development, applied in independent R&D projects such as an AI-assisted coaching platform.

Mobile Development with React Native and Expo
Development of cross-platform mobile applications using React Native and Expo, including EAS build pipelines and OTA update workflows for production-grade mobile delivery.

Web Accessibility and SEO
Application of web quality standards including WCAG accessibility guidelines, SEO best practices, and responsive design principles to deliver inclusive and high-performing web products.

Experience

Professional experience10+ years
Freelancer since2018

Languages

EnglishFluentHungarianNative speaker

Project history

Full Stack Engineer

Self-employed (Independent R&D) - AI-Assisted Strength Coaching Platform
Independent R&D project validating end-to-end multicloud delivery using React/Vite PWA, React Native app, NestJS microservices on GCP, Terraform, Auth0, and CircleCI in an Nx monorepo. Prototyped LLM-assisted coaching workflows alongside program design and athlete tracking surfaces.

Full Stack Engineer

Self-employed (B2B Subcontractor) - Web and Kiosk Application for 3D Printing
Delivered a cross-channel product combining kiosk workflows with web-based administration. Built maintainable frontend architecture with API integration and automated test coverage. Implemented infrastructure automation to support continuous delivery. Tech: React, TypeScript, Terraform, AWS, Docker, Ansible, NestJS.

Lead Backend Engineer

Self-employed (B2B Subcontractor) - Art Event and Exhibition Application
Delivered backend services for a production microservice platform used at a major international art event. Worked across backend and platform layers in an Nx monorepo on Azure/AKS. Improved service integration and API reliability within cloud deployment workflows for a 7-person scrum team. Tech: NestJS, TypeScript, Nx, Docker, Azure, AKS.

Full Stack Engineer

Self-employed (B2B Subcontractor) - Mathematics Education Platform
Contributed to a microfrontend-based educational product with reliable frontend integration and iterative delivery. Supported backend and cloud-connected features while maintaining product quality and user experience. Applied automated UI testing in a multi-service stack. Tech: React, TypeScript, RxJS, Cypress, Node.js, Flask, AWS.

Frontend Engineer

Self-employed (B2B Subcontractor) - Rail Logistics B2B Application
Delivered frontend capabilities in a modular enterprise environment with strong UX consistency requirements. Implemented reusable UI patterns and component-driven development. Applied microfrontend patterns for long-term maintainability. Tech: React, TypeScript, Material UI, microfrontends, Storybook.

Frontend Engineer

Self-employed (B2B Subcontractor) - Dietary Supplement E-commerce Site
Developed customer-facing commerce flows for a B2C storefront with a headless content model. Improved UI consistency and delivery speed using component-based development. Shipped via a modern JAMstack deploy and CMS workflow. Tech: React, Next.js, TypeScript, Sanity CMS, Storybook, Vercel.

Frontend Engineer

Self-employed (B2B Subcontractor) - Healthcare Webshop with Headless CMS
Built and shipped frontend features for a healthcare webshop using a headless CMS workflow. Focused on semantic UI quality, accessibility, SEO, and scalable content-driven page generation. Tech: React, Gatsby, TypeScript, Nx, GraphQL, Contentful, AWS CloudFront.

Architect and Lead Full Stack Engineer

Self-employed (B2B Subcontractor) - ERP Platform for Auto Glass Service Company
Led architecture and technical delivery for a 5-person scrum team on a business-critical ERP serving B2B and B2C use cases. Implemented frontend and backend capabilities on Azure with Apollo GraphQL. Coordinated SAP integration and shipped a progressive web app experience to production. Tech: React, NestJS, Apollo GraphQL, Azure, SAP, PWA.

Full Stack Engineer

Self-employed (B2B Subcontractor) - Adventure Search and Reservation Web App
Implemented full-stack search and reservation flows for a travel-style product. Delivered frontend and GraphQL backend integration in a fast prototype-to-product timeline. Tech: React, GraphQL, Node.js, MongoDB.

Full Stack Engineer

Self-employed (B2B Subcontractor) - CNC Machine Status Monitor (Industry 4.0)
Built monitoring-focused UI connected to REST-based backend services for manufacturing telemetry. Delivered a reliable operator-facing status application. Tech: Angular, NgRx, Web API, MongoDB.

Technical Consultant

Self-employed (B2B Subcontractor) - ERP Estimation and Technical Consultancy
Delivered discovery and technical estimation for an ERP initiative. Defined delivery scope, implementation complexity, and sequencing recommendations to reduce project risk. Tech: ERP discovery, technical estimation.

Frontend Engineer

Self-employed (B2B Subcontractor) - Online Auction Web Application Prototype
Built a working prototype to simulate auction processes and validate product assumptions quickly. Covered frontend state handling for interactive bidding flows. Tech: React, Redux, TypeScript.

Full Stack Engineer

Self-employed (B2B Subcontractor) - Event Organiser Web Application
Implemented event operations features across frontend and backend layers. Established API contracts and delivery structure for maintainable iteration. Tech: React, Node.js, Express, Sequelize, OpenAPI.

Quantitative Developer

Citi
Developed software supporting quantitative and financial engineering workflows in a global banking environment. Improved and maintained a high-performance Fixed Income asset class pricing library in C++. Worked onsite in London Canary Wharf collecting client requirements for an FX trading application. Collaborated with stakeholders on reliable delivery within a regulated enterprise setting. Tech: React, Python, C++, Distributed Systems.

Software Developer

CAE
Developed and maintained software for aviation training and simulation-related systems. Worked onsite in Montreal collecting client requirements. Delivered application features in a structured enterprise development environment. Tech: React, Electron, Node.js, C++, Python.

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