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Leroy Steding
Senior Full-Stack Developer & AI Automation Architect
📧 leroysteding@gmail.com
đź“Ť Zaandam, Nederland
đź’Ľ linkedin.com/in/leroysteding
đź”— leroysteding.nl
đź’» github.com/leroysteding
PROFESSIONELE SAMENVATTING
Zeer bekwame Senior Full-Stack Developer en AI Automation Architect met 12+ jaar progressieve ervaring in het bouwen van enterprise-scale webplatformen, mobiele applicaties en intelligente automatiseringsoplossingen. Diepgaande expertise in het moderne JavaScript-ecosysteem (React, Next.js, TypeScript) met bewezen vermogen om complexe systemen te architectureren en te leveren die miljoenen gebruikers bedienen. Gespecialiseerd in AI-integratie (OpenAI, LangChain), microservices-architectuur en headless commerce-platforms. Bewezen staat van dienst in het leiden van cross-functionele teams, het mentoren van junior developers en het stimuleren van technische innovatie die meetbare bedrijfswaarde oplevert. Expert in full-stack ontwikkeling (Node.js, Python, Java), cloud-infrastructuur (AWS, Azure, Vercel) en moderne DevOps-praktijken (Docker, Kubernetes, CI/CD). Gepassioneerd over webtoegankelijkheid (WCAG 2.1 AA/AAA), prestatie-optimalisatie en het creëren van uitzonderlijke gebruikerservaringen door schone, onderhoudbare code. Bedreven in het vertalen van complexe bedrijfsvereisten naar schaalbare technische oplossingen met focus op codekwaliteit, beveiliging en best practices.
KERNCOMPETENTIES
Frontend Ontwikkeling
React (Hooks, Context API, Server Components) • Next.js (App Router, Server Actions, Middleware) • TypeScript • JavaScript (ES6+) • Vue.js (Composition API) • Angular • HTML5 (Semantische Markup, Toegankelijkheid) • CSS3 (Grid, Flexbox, Custom Properties) • Tailwind CSS • SASS/SCSS (Modules, Mixins) • Styled Components • CSS-in-JS • Responsive Design (Mobile-First) • Progressive Web Apps (PWA, Service Workers) • Web Toegankelijkheid (WCAG 2.1 AA/AAA, ARIA) • SEO Optimalisatie • Storybook (Component Documentatie) • Framer Motion (Animatie) • GSAP • React Native • Expo SDK • React Query/TanStack Query • Zustand/Redux Toolkit • Webpack • Vite • Turbopack • SWC Compiler • Babel
Backend Ontwikkeling
Node.js 20+ (Express, Fastify, Nest.js) • Python 3.11+ (Django, Flask) • FastAPI (Async, Pydantic) • Java 17+ (Spring Boot, Hibernate) • REST APIs (OpenAPI/Swagger) • GraphQL (Apollo Server, GraphQL Yoga) • Microservices Architectuur (Event-Driven, CQRS) • Serverless Functions • PostgreSQL (Geavanceerde Queries, Indexes) • MongoDB (Aggregation, Sharding) • Redis (Caching, Pub/Sub) • Supabase (Real-time, Auth, Storage) • Prisma ORM • TypeORM • Sequelize • SQLAlchemy • Authenticatie (JWT, OAuth 2.0, SAML) • Autorisatie (RBAC, ABAC) • API Gateway • Rate Limiting • WebSockets • Server-Sent Events (SSE)
AI & Machine Learning
OpenAI API (GPT-4, GPT-4 Turbo, Embeddings) • Anthropic Claude • LangChain (Chains, Agents, Memory) • LlamaIndex • AI Agents (ReAct, Function Calling) • Vector Databases (Pinecone, ChromaDB) • RAG (Retrieval-Augmented Generation) • Prompt Engineering • Machine Learning Integratie • TensorFlow.js • Hugging Face Transformers • n8n Workflow Automatisering • Zapier • Make (Integromat) • Playwright Automatisering • Puppeteer • Selenium • Proces Optimalisatie • Data Pipeline Design
DevOps & Infrastructuur
Docker (Compose, Multi-stage Builds) • Kubernetes (Deployments, Services) • Git (Geavanceerde Workflows, Rebasing) • GitHub Actions • GitLab CI/CD • Jenkins • CircleCI • Azure DevOps Pipelines • Vercel (Edge Functions, Analytics) • Netlify • Azure (App Service, Functions, DevOps) • AWS (EC2, S3, Lambda, CloudFront, RDS) • Google Cloud Platform • Turborepo (Monorepo Management) • pnpm • npm • Yarn • Lerna • Nginx • Apache • Load Balancing • CDN Configuratie • Monitoring (Sentry, DataDog, New Relic) • Logging (ELK Stack) • Infrastructure as Code (Terraform, Pulumi)
Testing & Kwaliteitscontrole
Jest (Unit, Integration Testing) • React Testing Library • Vitest • Playwright (E2E Testing) • Cypress • Puppeteer • Storybook (Visual Testing) • Chromatic • ESLint (Custom Rules) • Prettier • Husky (Git Hooks) • SonarQube (Code Quality) • TypeScript Compiler (Strict Mode) • Test-Driven Development (TDD) • Behavior-Driven Development (BDD) • Code Coverage (Istanbul, c8) • Performance Testing (Lighthouse, WebPageTest) • Toegankelijkheids Testing (axe, Pa11y) • Security Testing (OWASP, Snyk)
E-Commerce & CMS
MedusaJS (Headless Commerce) • Shopify (Liquid, Storefront API) • WooCommerce • Magento • SAP Hybris Commerce • Stripe (Betalingen, Abonnementen, Webhooks) • PayPal Integratie • Betalingsverwerking (PCI Compliance) • Multi-valuta Ondersteuning • Multi-tenant Architectuur • POS Systemen Integratie • Voorraadbeheer • Order Management Systemen • Sanity CMS • Contentful • Strapi • WordPress (Headless)
Data & Analytics
SQL (Complexe Queries, Optimalisatie) • NoSQL (Document, Key-Value Stores) • Database Design (Normalisatie, Indexing) • Data Modellering • Google Analytics 4 • Mixpanel • Segment • PostHog • A/B Testing (Optimizely, VWO) • Feature Flags (LaunchDarkly) • Data Visualisatie (Chart.js, D3.js, Recharts) • ETL Pipelines • Data Warehousing • Business Intelligence
Methodologieën & Best Practices
Agile/Scrum (Daily Standups, Sprints) • Kanban • Lean Development • Code Review (Pull Requests, Pair Programming) • Clean Code Principes • SOLID Principes • Design Patterns (MVC, Observer, Factory) • API Design Best Practices • RESTful Architectuur • Microservices Patterns • Event-Driven Architectuur • Domain-Driven Design (DDD) • Test-Driven Development (TDD) • Continuous Integration/Deployment (CI/CD) • GitFlow Workflow • Documentatie (Technisch Schrijven, API Docs) • Technische Mentoring
Soft Skills & Leiderschap
Technisch Leiderschap (Team Lead, Architect) • Team Mentoring & Coaching • Stakeholder Communicatie & Management • Klantrelaties • Probleemoplossing & Kritisch Denken • Projectmanagement • Code Review & Kwaliteitscontrole • Kennisdeling • Agile Methodologieën (Scrum Master) • Cross-functionele Samenwerking • Presentatievaardigheden • Technisch Schrijven & Documentatie • Conflictoplossing • Tijdmanagement • Prioriteiten Stellen
PROFESSIONELE ERVARING
Senior Front-end Developer
SURF (via Rebels) | Utrecht, Netherlands
March 2025 – Present
Leading frontend development for enterprise-grade whitelabel platform architecture supporting multiple Next.js 14 applications within a Turborepo monorepo. Assignment through Rebels. Architecting and implementing comprehensive shared UI component library with Tailwind CSS, TypeScript, and Storybook serving Edusources and MBOdata platforms with 50,000+ educational resources.
- Reduced development time by 40% through shared component library
- Achieved 100% WCAG 2.1 AA compliance across platforms
- Successfully launched multi-brand platform serving 50,000+ educational resources
Technologieën:
Next.js 14TurborepoTypeScript 5.xReact 18Tailwind CSSStorybook 8GitLab CI/CDWCAG 2.1 AA+20 more
Founder & Lead Developer
Hifive | Zaandam, Netherlands
July 2013 – Present
Founded and lead full-service digital innovation agency specializing in enterprise-scale custom e-commerce platforms, cross-platform mobile applications, AI-powered automation solutions, and headless CMS implementations. Successfully delivered 100+ custom projects serving 50+ clients with 95% retention rate, pioneering AI integration in Dutch SMB market.
- Successfully delivered 100+ custom projects
- Built long-term partnerships with 50+ clients
- Pioneered AI integration in Dutch SMB market
- Maintained 95% client retention rate
Technologieën:
Next.js 16React 19React NativeExpo SDKTypeScript 5.xNode.js 20+Python 3.11+FastAPI+33 more
Senior Frontend Developer
VodafoneZiggo (via Rebels) | Utrecht, Netherlands
November 2024 – March 2025
Developed enterprise-scale cross-platform mobile application serving 3M+ active users with React Native, Expo SDK, and TypeScript. Assignment through Rebels. Built comprehensive design system with 100+ documented components in Storybook, implementing Redux Toolkit for state management and achieving 90%+ test coverage with Jest and React Native Testing Library.
- Delivered mobile app serving 3M+ active users
- Achieved 99.9% uptime and 4.5+ star app store rating
- Reduced component development time by 50% with design system
- Maintained 90%+ test coverage across codebase
Technologieën:
React NativeExpo SDK 50TypeScript 5.xRedux ToolkitRTK QueryStorybook 8JestReact Native Testing Library+24 more
Full-Stack Engineer
BraveLink (via BraveOrange) | Amsterdam, Netherlands
April 2024 – October 2024
Data-driven talent matchmaker combining software development expertise with people-focused approach. Assignment through BraveOrange.
- Successfully placed 50+ professionals in ideal roles
- Achieved 95% placement retention after 6 months
- Built data-driven matching algorithms
Technologieën:
Data AnalysisFull-Stack DevelopmentStrategic MatchingTypeScriptReactNode.js
Senior Frontend Developer
BraveOrange | Amsterdam, Netherlands
September 2023 – October 2024
Full-stack development delivering enterprise web applications using React, Next.js 14, TypeScript, Java 17, and Spring Boot 3. Built comprehensive microservices architecture with RESTful APIs, implemented modern CI/CD pipelines, and mentored junior developers on best practices and architectural patterns.
- Delivered multiple enterprise web applications
- Integrated frontend and backend systems seamlessly
- Mentored junior developers on best practices
Technologieën:
React 18Next.js 14TypeScript 5.xJava 17Spring Boot 3Node.jsPostgreSQLRESTful APIs+25 more
Front-end Developer
Robidus (via Rebels) | Netherlands
March 2021 – December 2021
Developed advanced application platform integrating diverse data streams for WGA and Ziektewet guidance. Assignment through Rebels.
- Built platform processing 10,000+ cases annually
- Reduced case processing time by 50%
- Maintained 100% GDPR compliance
Technologieën:
Next.jsTypeScriptReactJenkinsCI/CD
Front-End Developer
Software Bastards | Amsterdam, Netherlands
July 2022 – September 2023
Frontend development delivering innovative web applications using React 18, TypeScript, and modern JavaScript ecosystem. Built reusable component libraries, implemented complex state management with Redux Toolkit, and maintained 90%+ test coverage. Contracted Tibbaa for React Native mobile development during this period.
- Delivered multiple client projects successfully
- Implemented reusable component libraries
- Maintained high code quality standards
Technologieën:
React 18TypeScript 4.xJavaScript ES2022Redux ToolkitRedux SagaWebpack 5BabelCSS3+20 more
React Native Developer
Tibbaa (via Software Bastards) | Amsterdam, Netherlands
September 2022 – May 2023
Mobile application development building cross-platform iOS and Android applications with React Native and Expo. Assignment through Software Bastards. Implemented complex navigation flows, integrated native modules, and achieved 4.5+ star app store ratings with focus on performance optimization and user experience.
- Launched successful mobile applications
- Achieved excellent app store ratings
- Delivered features on tight deadlines
Technologieën:
React Native 0.70+Expo SDKTypeScript 4.xRedux ToolkitReact NavigationAsyncStorageFirebase Cloud MessagingPush Notifications+19 more
Frontend Developer
Rampage (via Rebels) | Amsterdam, Netherlands
January 2021 – July 2022
Frontend development assignment through Rebels, building modern web applications with React and TypeScript.
- Delivered multiple feature releases
- Improved application performance
- Maintained excellent code quality
Technologieën:
ReactTypeScriptJavaScriptCSS3HTML5Agile
Full-Stack Developer
Rebels | Amsterdam, Netherlands
February 2020 – July 2022
Full-stack development at leading Amsterdam tech consultancy, delivering high-quality software solutions across diverse client assignments. Successfully completed 5+ major projects for enterprise clients including VodafoneZiggo, SURF, Rampage, Robidus, and Lost Lemon, building expertise across React, Next.js, TypeScript, Node.js, and Java ecosystems.
- Successfully completed 5+ client assignments
- Built long-term relationships with major clients
- Delivered solutions across diverse technical stacks
- Consistently received positive client feedback
Technologieën:
React 17-18Next.js 11-13TypeScript 4.xJavaScript ES2020+Node.js 14-16ExpressFastifyJava 11-17+24 more
Frontend Developer
Lost Lemon (via Rebels) | Amsterdam, Netherlands
October 2020 – December 2020
Frontend development for MensCentraal application using SASS and Java JSF/Primefaces components.
- Improved user-friendliness based on research
- Successfully redesigned dashboard
- Enhanced visual consistency across application
Technologieën:
SASSJava JSFPrimefacesJavaScriptCSS3User Research
Hybris E-Commerce Developer
Timber and Building Supplies Holland N.V | Zaandam, Netherlands
March 2019 – February 2020
Frontend development for SAP Hybris E-Commerce platform with deep integration into backend systems.
- Managed 50,000+ product SKUs
- Processed €5M+ in annual online sales
- Served 1,000+ B2B customers successfully
Technologieën:
SAP HybrisJavaSAP IntegrationE-CommerceFrontendSpring
Front-End Developer
Improvers | Netherlands
October 2017 – August 2018
Frontend development using modern JavaScript frameworks and responsive design techniques.
- Delivered multiple client projects
- Improved website performance
- Implemented responsive designs
Technologieën:
JavaScriptHTML5CSS3jQueryResponsive DesignBootstrap
Junior Software Engineer
WoodWing | Zaandam, Netherlands
February 2016 – September 2016
Software development internship and junior role at leading content management solutions provider.
- Successfully transitioned from intern to junior engineer
- Contributed to enterprise platform features
- Learned professional software development practices
Technologieën:
JavaScriptPHPHTML5CSS3Content ManagementAgile
Junior Software Engineer
Objeqts BV | Netherlands
May 2015 – September 2015
Junior software development role focusing on web applications and software solutions.
- Contributed to multiple projects
- Developed web applications
- Learned professional workflows
Technologieën:
JavaScriptPHPHTML5CSS3MySQLWeb Development
Web Developer Intern
Jaspers Media | Netherlands
January 2014 – May 2014
Web development internship focusing on PHP, MySQL, and JavaScript. Built Google Maps application for Biernet.nl.
- Built functional Google Maps application
- Integrated Google Maps API successfully
- Gained foundational web development skills
Technologieën:
PHPMySQLJavaScriptGoogle Maps APIHTML5CSS3
Application Developer Intern
DJW Media | Netherlands
January 2013 – June 2013
Application development internship working on CMS systems and the Feest Familie website.
- Contributed to Feest Familie website
- Learned CMS development
- Built foundational programming skills
Technologieën:
PHPMySQLCMSHTMLCSSJavaScript
BELANGRIJKSTE PROJECTEN
AI ATS Recruitment Platform
Intelligent applicant tracking system for automated job-candidate matching. Built AI-powered resume parsing and semantic job matching using vector embeddings. Implemented automated screening workflows and candidate ranking based on job requirements and experience.
- Automated resume parsing and skills extraction
- Built semantic matching engine for job-candidate fit
- Implemented AI-powered candidate screening workflows
Technologieën:
Next.jsOpenAI GPT-4LangChainPineconePostgreSQLTypeScriptPython
3D CAD Quote Tool
Manufacturing quotation system with real-time 3D CAD file visualization and automated cost calculation. Integrated Three.js for interactive 3D rendering and Python-based parser for extracting specifications from STEP, STL, and DXF files.
- Automated quote generation process with 3D visualization
- Built CAD file parser supporting multiple formats
- Integrated automated PDF report generation
Technologieën:
Next.jsThree.jsPythonFastAPIPostgreSQLReact Three FiberTypeScript
AI-Powered Manufacturing Solutions
Digital transformation initiative implementing AI automation for manufacturing operations. Built intelligent document processing using OpenAI GPT-4 and automated workflow orchestration with n8n connecting ERP and CRM systems.
- Automated document processing workflows
- Integrated AI-powered quality prediction
- Built real-time production monitoring dashboards
Technologieën:
OpenAI GPT-4LangChainPythonFastAPIn8nPower BIPostgreSQL
AllyScan
AI-powered accessibility scanner that analyzes websites for WCAG compliance and provides actionable recommendations for improvement.
- Automated accessibility testing with detailed reports
- Built Chrome extension for real-time auditing
- Implemented CI/CD integration for testing workflows
Technologieën:
Next.jsPlaywrightPostgreSQLTypeScriptPrismaDocker
IntelliWealth - AI Finance Tool
Personal AI-backed financial management platform with intelligent budgeting and investment insights. Built conversational AI interface using OpenAI for natural language financial queries and automated expense categorization. Implemented real-time portfolio tracking and personalized financial recommendations.
- Built AI-powered financial assistant with natural language processing
- Integrated bank account connections via Plaid API
- Implemented automated expense categorization and budgeting
Technologieën:
Next.jsOpenAI GPT-4PythonPostgreSQLPlaid APITypeScriptRecharts
Headless E-Commerce Platform
Modern commerce platform built on MedusaJS with Next.js storefront. Implemented headless architecture for flexible content management, integrated Stripe payments and shipping workflows, and built subscription management system.
- Built headless commerce architecture
- Integrated payment processing and shipping
- Implemented subscription management system
Technologieën:
MedusaJSNext.jsTypeScriptStripePostgreSQLAlgoliaTailwind CSS
OPLEIDING
Bachelor of Science in Software Engineering
Hogeschool van Amsterdam, Amsterdam, Nederland
2014 - 2019
Focus op software architectuur, webtechnologieën en agile ontwikkelmethodologieën
Applicatieontwikkelaar (MBO Niveau 4)
Regio College, Nederland
2011 - 2014
ICT Applicatieontwikkeling met focus op webontwikkeling en database design
CERTIFICERINGEN
•
Next.js & React - The Complete Guide
Udemy • 2022
•
TypeScript: The Complete Developer's Guide
Udemy • 2021
•
Docker & Kubernetes: The Practical Guide
Udemy • 2021
•
Microservices with Node.js and React
Udemy • 2020
•
Complete Web Accessibility (WCAG) Training
Udemy • 2020
•
GraphQL with React: The Complete Developers Guide
Udemy • 2019
•
React Native - The Practical Guide
Udemy • 2018
•
Angular 2 and Node.js - The Practical Guide
Udemy • 2017
•
Advanced React and Redux
Udemy • 2017
•
Modern JavaScript: ES6 and Beyond
Udemy • 2016
•
Learn and Understand AngularJS
Udemy • 2016
•
Git & GitHub Complete Masterclass
Udemy • 2015
•
Arbeidsmarktgekwalificeerd Assistent Applicatieontwikkelaar
ROC • 2014
•
Medewerker Beheer ICT
ROC • 2013
TALEN
Nederlands• Moedertaal
Engels• Professioneel Werkniveau