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[ SWYTECH.DEV ]

Gyula Szvitek

Professional web-developer

I am a Full-Stack Engineer with 10+ years of experience architecting high-availability web applications, distributed microservices, and modern frontend ecosystems. Specialized in React, TypeScript, Node.js, and Cloud Infrastructure (Azure / AWS), with a proven track record delivering complex enterprise software, greenfield product launches, automated workflows, and event-driven backend systems. Skilled in leading cross-service migrations, optimizing system performance, and collaborating with international engineering teams.

Gyula Szvitek
Status:
Small projects only
SKILLS
Express
Jest
MongoDB
Nest.js
Next.JS
NodeJS
React
Redux
Sanity
Tailwind CSS
Typescript
Express
Jest
MongoDB
Nest.js
Next.JS
NodeJS
React
Redux
Sanity
Tailwind CSS
Typescript
PROJECTS
SWYTECH.dev thumbnail

SWYTECH.dev

Featured

Personal Portfolio — A high-performance central hub highlighting my web development career, technical skills, and featured projects. Features live interactive demos, custom UI components, and my professional background.

SanityTypescriptNext.JSReactFigmaTailwind CSS
SanityTypescriptNext.JSReactFigmaTailwind CSS
CyberCN UI thumbnail

CyberCN UI

Featured

Cybercn UI is a modern component architecture reimagining the original CSS library. Features a bold cyber aesthetic, accessible components, live code examples, and full documentation.

TypescriptNext.JSReactTailwind CSS
TypescriptNext.JSReactTailwind CSS
TB-Toolbox thumbnail

TB-Toolbox

Featured

High-performance troop calculator and strategy suite delivered as an offline-first PWA. Features a dual-tier build: a lightweight Vanilla JS engine alongside an advanced React & TypeScript app.

JavascriptHTMLTypescriptBootstrapReact
JavascriptHTMLTypescriptBootstrapReact
EXPERIENCE
Segen Ltd. logo

Segen Ltd.

London

Nov 2024 — Present

Software Developer

Website

The UK’s Leading Renewables Distributor

Engineered a comprehensive full-stack rewrite, transitioning a legacy monolithic RM/SOP platform into a modern TypeScript monorepo. Built custom React extension apps to significantly enhance the core Shopify e-commerce experience. Executed a seamless zero-downtime migration, architecting cross-system data synchronization and maintaining backward compatibility to keep both legacy and modern systems live simultaneously. Gained deep production experience in Azure cloud infrastructure, CI/CD pipelines, and enterprise-grade React architecture.

Nest.jsNodeJSMySQLRedisAzureGrafanaOpenTelemetryReactTailwind CSSCSSHTMLTypescriptFigmaGitGraphQLJest
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ARCH

Dual-System Architecture & Storefront Launch

Actively contributed to full-stack feature development during a greenfield Shopify storefront launch while maintaining legacy platform infrastructure; integrated Node.js middleware APIs to manage real-time product, order, and account data sync across both systems.

FEAT

Shopify React Extension Apps

Engineered new features and UI components within custom React-based Shopify app extensions and admin proxy applications, bridging complex backend rules with modern storefront interfaces to support custom B2B buying flows.

FEAT

Order & Fulfillment Business Logic

Built real-time validation checks within Node.js fulfillment microservices, dynamically holding or releasing customer orders based on live account balance rules and warehouse picking conditions.

FEAT

Invoice & Account Features

Developed responsive React frontend interfaces and Node.js backend integrations within the Shopify admin proxy app, enabling self-service invoice tracking, status verification, and proof-of-payment uploads.

PERF

Backend API Reliability & Bug Resolution

Diagnosed and resolved high-volume event processing errors in Node.js microservices, updating payload validation to eliminate 1,450+ weekly execution failures and clear blocked message queues within 3 days.

LEAD

Global Agile Collaboration

Partnered with distributed international engineering teams, product managers, and UX designers in an agile environment, maintaining high code quality through TDD, component testing, and peer code reviews.

F

Freelance Developer

London

Apr 2023 — Nov 2024

Professional Development

Full-Stack Engineering & Continuous Learning

Dedicated focused development time to mastering modern full-stack TypeScript ecosystems. Built high-performance, edge-rendered web applications using React, Next.js, and Vue. Parallelly earned industry certifications and deepened practical expertise in cloud architecture, modern design patterns, and performance optimization techniques to stay ahead of evolving web technologies.

ExpressNest.jsNodeJSMongoDBPostgresSQLAstroD3Next.JSNuxt JSReactReduxTailwind CSSVue.jsCSSHTMLJavascriptTypescriptFigmaGitJamstackJestSanity
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Modern React & Next.js Mastery

Acquired deep proficiency in React, Next.js, and modern SSR/SSG full-stack ecosystems.

FEAT

Industry Certification & Verification

Completed formal industry certifications to validate technical domain expertise.

LEAD

IT Advisory & Side Project Delivery

Engaged in IT consultancy projects and collaborated on modern web application side projects.

HP (via Oneflow Acquisition) logo

HP (via Oneflow Acquisition)

London

Feb 2019 — Apr 2023

Full Stack typescript developer (Cloud Engineer 3)

Website

Enterprise Print Workflow & Automation Software

Contributed to modernizing Oneflow’s core enterprise printing platform—a startup solution later acquired by HP and integrated into HP Site Flow, their flagship global cloud-based print automation software. Drove frontend modernization by migrating core modules from AngularJS to Vue.js, developed new microservice APIs using Node.js and MongoDB, and established comprehensive unit/integration test suites. Managed high-availability infrastructure using Docker, Kubernetes (EKS), and AWS services (S3, CloudFront, SNS/SQS) with Sentry and New Relic monitoring, maintaining automated deployments via CircleCI and building internal management tooling in React.

ExpressNodeJSMongoDBAWSCircleCIDockerGrafanaKubernetesTerraformBootstrapVue.jsCSSHTMLJavascriptTypescriptCypressGitJestMocha
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ARCH

Vue.js Frontend Modernization

Rewrote legacy AngularJS frontend to Vue.js 2, modernizing codebase and architecture.

DEVOPS

Kubernetes to Amazon EKS Migration

Led backend application migration from custom K8s to AWS EKS, updating CI/CD pipelines.

ARCH

JavaScript to TypeScript Migration

Executed application-wide migration from JavaScript to strongly typed TypeScript.

FEAT

Enterprise Feature Delivery & Support

Maintained frontend/backend applications, delivering customer-requested features and bug fixes.

LEAD

Sprint Backlog & Bug Fortnight

Spearheaded dedicated bug fortnight sessions to clear backlog debt and improve application stability.

SQS Ltd. logo

SQS Ltd.

London

Nov 2016 — Feb 2019

Full Stack Software developer

Website

Leading Utilities Reinstatement & Infrastructure Provider

Contributed as part of a core engineering team developing Ontrack, a proprietary cloud-based work management system designed specifically for utility and street works reinstatement. Built Ontrack Lite as an initial high-performance proof-of-concept using Angular, Node.js, and MongoDB. Following its success, helped spearhead the full modernization of the company’s legacy PHP architecture into a scalable, modern JavaScript codebase, dramatically improving system speed, reporting capabilities, and operational reliability.

ExpressNodeJSSymfonyMongoDBMySQLAWSJenkinsAngularBootstrapCSSHTMLJavascriptPHPTypescriptGitJest
// SYSTEM_HIGHLIGHTS
ARCH

Full Stack Legacy PHP Rewrite

Rewrote legacy Symfony PHP system into a modern MEAN stack (Node.js, Angular 2+, MongoDB/MySQL).

FEAT

Ontrack Lite System Launch

Developed and released the Ontrack Lite system as a lightweight proof-of-concept.

FEAT

SOAP API Utility Integration

Integrated a major UK power supplier’s legacy system via SOAP API into Ontrack 2 & 3.

Betfect logo

Betfect

London

Feb 2016 — Aug 2016

Lead PHP Developer

Innovative Social Sports Betting Platform

Developed features for an interactive social betting ecosystem that allowed users to create, share, discuss, and replicate betslips in real-time. Integrated complex third-party REST/WebSocket APIs from major global bookmakers (including Ladbrokes and William Hill), driving high-frequency data syncing, low-latency UI updates, and an engaging community-driven user experience.

SymfonyMySQLCSSHTMLJavascriptPHPGit
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LEAD

Engineering Team Leadership

Led a team of 3 developers while overseeing system updates and feature rollouts.

ARCH

Symfony Core Framework Upgrade

Upgraded core platform framework to Symfony 2.7 to improve system stability.

FEAT

William Hill Bookmaker Integration

Released direct William Hill API integration, coordinating directly with partner dev teams.

FIN

Wallet & Odds Comparison Engine

Integrated user wallets on betfect.com and implemented live odds comparison features.

EDUCATION
ACADEMIC RECORD

Óbudai University

Sep 2009 — Sep 2015
BSc Technical Management (IT and project management)

John Von Neumann Computer Science Secondary School

Sep 2006 — Sep 2006
IT System Administrator, Webmaster
General Certificate of Secondary Education
CONTACT

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