Akos is available for hire
Hire AkosAkos Szabacsi
Verified Expert in Engineering
Full-stack Engineer and Developer
Budapest, Hungary
Toptal member since February 5, 2024
Bio
Akos is an experienced full-stack engineer with 9+ years of diverse experience, including proficiency in the React, TypeScript, and Node.js stack complemented by tech lead and software architect roles. His journey encompasses various industries, including eCommerce, healthcare, automotive, flight simulation, and investment banking. Akos has navigated complex landscapes and contributed his technical expertise to deliver impactful solutions. Since 2018, he's been freelancing across Western Europe.
Portfolio
Multi-tenant Strength Coaching SaaS
Google Cloud Platform (GCP), Docker, CircleCI, React, React Native, Vite...
Additive Manufacturing Startup (3D Printing)
Amazon Web Services (AWS), React, Node.js, TypeScript, Ansible, Nx, Material UI...
Art Events and Exhibitions Organizer (Switzerland)
TypeScript, NestJS, Microservices, Nx, Strapi, REST, Azure DevOps, Azure...
Experience
- CSS - 7 years
- TypeScript - 7 years
- React - 6 years
- Node.js - 6 years
- GraphQL - 5 years
- NestJS - 4 years
- React Testing Library - 3 years
- Cypress - 2 years
Work Experience
Founding Full-Stack & Cloud Engineer
2026 - PRESENT
Multi-tenant Strength Coaching SaaS
- Built a full coaching SaaS (web + mobile + microservices) in an Nx monorepo on GCP/Cloudflare.
- Owned auth, multi-env infra-as-code, and CI/CD with zero long-lived cloud keys.
- Delivered offline program editing + online-only AI/chat with strict quota/billing enforcement.
- Shipped Gemini Copilot with credit metering, agent modes, and structured program proposals.
- Enforced domain rules for publishing, affiliations, and AI entitlement at API and UI layers.
Technologies: Google Cloud Platform (GCP), Docker, CircleCI, React, React Native, Vite, NestJS, Node.js, Stripe, Cloudflare, Gemini API, Cloud Firestore, Nx, PWA, Astro
Senior Full-stack Engineer
2025 - 2026
Additive Manufacturing Startup (3D Printing)
- Engineered a responsive React/TypeScript application for industrial 3D printer diagnostics and maintenance, optimizing real-time data handling across mobile and desktop devices.
- Engineered an immutable deployment strategy using AWS ECR container image digests, guaranteeing production-proven runtime stability on remote hardware regardless of underlying Raspberry Pi OS updates.
- Overhauled legacy deployment workflows by establishing a trunk-based development branching strategy, replacing slow release cycles with short-lived feature branches and automated PR validation pipelines.
- Integrated strict linting, TypeScript compilation checks, and automated unit testing directly into PR validation pipelines, preventing broken builds and reducing production regression bugs.
Technologies: Amazon Web Services (AWS), React, Node.js, TypeScript, Ansible, Nx, Material UI, Jest, Webpack, AWS Lambda
Senior TypeScript Developer
2024 - 2025
Art Events and Exhibitions Organizer (Switzerland)
- Developed a microservice back end for an iOS app. Used AI and a headless CMS to streamline entry for thousands of attendees at art fairs while providing artwork details, interactive maps, and real-time guidance.
- Received high praise for the app. Multiple art fairs worldwide used this app, which features built-in internationalization support.
- Integrated legacy data sources into the back end, ensuring a smooth transition from existing systems to the new product.
Technologies: TypeScript, NestJS, Microservices, Nx, Strapi, REST, Azure DevOps, Azure, Azure Cosmos DB, PostgreSQL, Node.js, Back-end, Terraform, LangChain, Azure AI Search, Azure OpenAI Service, Jest, Webpack
Senior React/TypeScript Developer (Contractor)
2023 - 2023
Maths Education Platform (Berlin, Germany)
- Developed a React-based front-end of a math education platform for students across the DACH region, financed by the German Federal Government.
- Helped the team to improve its testing strategy and methods. Shared my React Testing Library knowledge.
- Encouraged and helped the team to use Storybook more and use it efficiently, consequently increasing the quality of reusable components and documentation.
Technologies: React, TypeScript, Cypress, React Testing Library, RxJS, Storybook, UI Components, Amazon Web Services (AWS), Front-end, User Interface (UI), APIs, Web Development, Unit Testing, Context API, JavaScript, Jest, Webpack
Senior React/TypeScript Developer
2022 - 2022
Dietary Supplement eCommerce Site (Switzerland)
- Introduced TypeScript to replace JavaScript, ensuring better code quality and readability.
- Introduced component testing methods and visual testing methods. The project had no test coverage before I joined.
- Improved the checkout and purchase process by using a better alternative in Shopify API.
Technologies: React, TypeScript, Sanity.IO, Next.js, Vercel, Chakra UI, Shopify, Percy, UI Components, Front-end, User Interface (UI), APIs, Web Development, Unit Testing, Context API, React Query, JavaScript, Jest, Webpack
Senior React/TypeScript Developer
2021 - 2022
Rail Logistic Application (Wien, Austria)
- Collaborated with a design team to map a design system from Figma into a React component library used by multiple squads/teams within the company.
- Took ownership of a major component library, drastically improving component reusability and quality within the company.
- Refactored and simplified several major components to fix or reduce the general overengeering problems the company had before.
Technologies: React, Material UI, TypeScript, Storybook, Microfrontends, React Testing Library, UI Components, Front-end, User Interface (UI), APIs, Web Development, Unit Testing, Context API, JavaScript, Jest, Webpack
Senior React/TypeScript Developer
2021 - 2021
Healthcare eCommerce site (Dublin, Ireland)
- Mentored senior colleagues with no prior knowledge of React and TypeScript.
- Orchestrated the migration of multiple pages from legacy Angular/.NET code to a React-based statically generated site (GatsybJS), leveraging Contentful as a headless CMS.
- Integrated the new statically generated React site with the existing website rendered by Angular/.NET, seamlessly incorporating functionalities such as login across the entire platform.
- Implemented end-to-end (E2E) and visual testing methodologies by integrating Cypress and Percy into the development workflow.
- Implemented an atomic design hierarchy for our components and thoroughly documented them using Storybook.
Technologies: React, TypeScript, Gatsby, Contentful, Accessibility, HTML, CSS, Nx, UI Components, Amazon Web Services (AWS), Front-end, User Interface (UI), APIs, Web Development, Unit Testing, Context API, React Query, JavaScript, Tailwind CSS, Jest, Webpack
Full-stack Engineer
2018 - 2021
Freelance
- Designed and created an enterprise resource planning (ERP) system as a lead developer for an auto glass service company.
- Built and designed an adventure search and reservation web app as a lead developer.
- Developed an Industrie 4.0 computer numerical control (CNC) machine status monitor application.
Technologies: React, TypeScript, Node.js, MongoDB, PostgreSQL, GraphQL, REST, React Testing Library, C#, Cypress, Docker, Git, Next.js, CSS, Front-end Architecture, Front-end Design, HTML, JavaScript, NestJS, UI Components, Front-end, User Interface (UI), SQL, HTML Email, Full-stack, APIs, Web Development, Unit Testing, Context API, Azure, Google Cloud Platform (GCP), Redis, Back-end, Terraform, Jest, Webpack
Quantitative Developer
2017 - 2018
Citi
- Implemented an efficient distributed testing framework for running against pricing libraries.
- Created and integrated a user-facing internal web app front end for running test scenarios.
- Developed and implemented a currency data visualization application to provide real-time market insights for traders.
Technologies: React, Node.js, Python, C++, TeamCity, Redux, Git, CSS, Front-end Architecture, Front-end Design, HTML, JavaScript, UI Components, Front-end, User Interface (UI), Flask, SQL, Full-stack, APIs, Web Development, TypeScript, Back-end, Webpack
Software Developer
2015 - 2017
CAE
- Migrated a core flight simulation program to a modern programming language.
- Designed and implemented a cost estimation tool for an internal department.
- Designed and implemented a tool for tracking the maintenance process of full-flight simulators.
Technologies: React, Electron, Node.js, AngularJS, C#, C++, Git, CSS, Redux, Front-end Architecture, Front-end Design, HTML, JavaScript, UI Components, Front-end, User Interface (UI), SQL, Full-stack, APIs, Web Development, Back-end, Webpack
Project History
Powerlifting Tracker App
Developed an application to revolutionize coach-athlete communication, program sharing, and progress tracking in powerlifting. I built it using React, TypeScript, and Node.js with PostgreSQL as the database.
Virtual Reality Based Flight Simulation Platform
As the focus of my thesis project, I researched and developed an innovative solution that utilizes virtual reality technology to map user motions onto 3D-printed aviation instruments and control panels.
Education
2012 - 2016
Bachelor's Degree in Mechatronics Engineering and Complex Systems
Obuda University - Budapest, Hungary
Skills
Libraries/APIs
React, Node.js, React Testing Library, Context API, React Query, RxJS, Stripe
Tools
Webpack, Jira, Confluence, Slack, Git, Terraform, Figma, GitHub, CircleCI, TeamCity, Nx, Azure OpenAI Service, Ansible, Astro
Languages
TypeScript, GraphQL, CSS, SCSS, HTML, JavaScript, C++, SQL, Python, C#
Frameworks
NestJS, Jest, Cypress, Next.js, Flask, Tailwind CSS, Electron, AngularJS, Redux, Material UI, React Native
Paradigms
Unit Testing, REST, Functional Programming, Microservices, Mechanical Design, Microfrontends, Azure DevOps
Platforms
Visual Studio Code (VS Code), Docker, Amazon Web Services (AWS), Google Cloud Platform (GCP), Linux, Vercel, Shopify, Contentful, Azure, Azure AI Search, AWS Lambda
Storage
PostgreSQL, MongoDB, Redis, Google Cloud, Azure Cosmos DB, Cloud Firestore
Other
Front-end Architecture, Front-end Design, UI Components, Front-end, User Interface (UI), Full-stack, APIs, Web Development, Strapi, Back-end, Teams, TypeORM, Gatsby, HTML Email, System Programming, Electric, Storybook, Sanity.IO, Chakra UI, Percy, Accessibility, Sensor Data, LangChain, Vite, Cloudflare, Gemini API, PWA
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