Akos Szabacsi

Principal Full Stack Engineer

Budapest, Hungary

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Professional Summary

Principal full stack engineer with 10+ years of experience across employed and freelance roles. Former software developer at CAE and quantitative developer at Citi; since 2018 delivering B2B subcontract projects and own products across Europe. Completed 13+ client engagements spanning product engineering, multicloud platforms, and CI/CD. Strong background in React and TypeScript frontends, Node.js microservices, and cloud-native platforms on AWS, Azure, and GCP. Designs and operates CI/CD pipelines, infrastructure as code (Terraform), and reliable, test-driven delivery.

Technical Skills

Languages
TypeScript, JavaScript, Python, C++, SQL
Frontend
React, React Native, Expo, Vite, Astro, Next.js, Angular, Electron, Gatsby, Material UI, Single-SPA, microfrontends, Storybook, RxJS, Redux, MobX, Apollo Client, GraphQL
Backend
Node.js, NestJS, Express, Flask, REST APIs, GraphQL, OpenAPI, event-driven design
Databases
PostgreSQL, MongoDB, Firestore, Sequelize
Cloud and Multicloud
AWS, Azure, GCP, Pub/Sub, Cloudflare, CloudFront, Cloud Run, AKS, serverless and container workloads
Infrastructure as Code
Terraform, Docker, Docker Compose, Kubernetes
CI/CD and DevOps
GitHub Actions, CircleCI, automated testing gates, Secret Manager, Artifact Registry, deployment automation, EAS build and OTA pipelines
Testing
React Testing Library, Playwright, Vitest, Jest, Cypress
Architecture
Nx monorepos, microservices, progressive web apps (PWA), headless CMS, SAP integration, Auth0

Professional Experience

  1. Self-employed — Full Stack Engineer

    Budapest, Hungary | November 2018 – Present

    Tech: React, Vite, TypeScript, Cloudflare, React Native, Expo, NestJS, Docker, GCP, Pub/Sub, REST, Astro, Terraform, Auth0, CircleCI, Nx, Google AI Studio

    • Delivered 13+ B2B subcontract engagements across Europe spanning product engineering, multicloud platforms, and CI/CD.
    • Build and ship own products end to end, including market research, product design, implementation, and alpha testing.
    • Own architecture, implementation, cloud infrastructure, and delivery pipelines for client and proprietary systems.
    • Full ownership of product development for an AI-assisted strength coaching platform across web, native mobile, backend, and marketing surfaces.
    • Conducted market research and product design, and organized an alpha testing phase.
    • Building the coaching progressive web app (PWA) for program creation and athlete performance tracking with React, Vite, and TypeScript, hosted on Cloudflare.
    • Delivering a native mobile app for athletes to log workouts with React Native, Expo, and TypeScript.
    • Integrating an AI coach into the platform for assisted training guidance.
    • Implementing a microservice backend on GCP using NestJS, Docker, TypeScript, and REST APIs, with GCP Pub/Sub for asynchronous communication.
    • Governing cloud infrastructure with Terraform and authenticating users with Auth0.
    • Shipping the product hero/marketing site with Astro.
    • Delivering via an Nx monorepo with CircleCI for CI/CD.
    • 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.
    • Contributed to a production microservice platform for a major international art event.
    • Worked across backend and platform layers in an Nx monorepo.
    • Supported service integration, API reliability, and cloud deployment workflows.
    • 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.
    • 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.
    • 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.
    • 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.
    • Led architecture and technical delivery for a business-critical ERP product serving B2B and B2C use cases.
    • Implemented frontend and backend capabilities on Azure.
    • Coordinated SAP integration and delivered a progressive web app experience.
    • 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.
    • Built monitoring-focused UI connected to REST-based backend services for manufacturing telemetry.
    • Delivered a reliable operator-facing status application.
    • Delivered discovery and technical estimation for an ERP initiative.
    • Defined delivery scope, implementation complexity, and sequencing recommendations to reduce project risk.
    • Built a working prototype to simulate auction processes and validate product assumptions quickly.
    • Covered frontend state handling for interactive bidding flows.
    • Implemented event operations features across frontend and backend layers.
    • Established API contracts and delivery structure for maintainable iteration.
  2. Citi — Quantitative Developer

    Budapest, Hungary | August 2017 – October 2018

    Tech: React, Python, C++, Distributed Systems

    • Developed software supporting quantitative and financial engineering workflows in a global banking environment.
    • Collaborated with stakeholders on reliable delivery within a regulated enterprise setting.
  3. CAE — Software Developer

    Budapest, Hungary | July 2015 – August 2017

    Tech: React, Electron, Node.js, C++, Python

    • Developed and maintained software for aviation training and simulation-related systems.
    • Delivered application features in a structured enterprise development environment.