Core Web Vitals Experts in Germany

Strategic Marketing / New Customer Acquisition (B2B):

• Market and competitor analysis: Recorded competitors, developed evaluation matrices, outlined the provider landscape with potential customers, competitors and partners
• Designed a cross-media, personalized multi-touch campaign
• Developed the multi-touch strategy in various multi-stage versions, determined touchpoints, target companies and target persons, developed ideal customer profile and contact ideas
• Designed all individual measures: Developed concepts for letters, postcards, landing pages, e-mails, phone calls and downloads
• Visualized the process logic of the contact sequences (flowchart)
• Described the distinction from “Account-Based Marketing”
• Implementation planning: Researched providers for packaging, shipping and landing page software, negotiated terms, recommended tools and partners

Social Media Marketing:

• Goal categorization, definition and recommendations for action
• Review and selection of channels
• Design of channel management
• Developed an 11-week editorial plan (Instagram & LinkedIn)
• Developed, implemented and published image and video posts
• Campaign launch, ongoing monitoring and optimization

Search Engine Optimization (SEO):

• Website audit with indexing check
• Ranking, backlink, traffic and competitor analyses
• Analyzed search and user behavior
• Consulting on SEO risks during relaunches with domain changes
• Keyword research and recommendations for action

• Development and optimization of the RTL+ frontend application for SmartTV and set-top box platforms with React and Next.js.
• Key role in the technical coordination of developers within the team and in coordinating implementation.
• Central interface to adjacent teams to simplify development processes and improve cross-team alignment.
• Improved frontend performance, stability, and rendering behavior on low-powered devices in a restricted runtime environment.
• Implemented a frontend testing strategy with Jest, React Testing Library, and Playwright.
• Implemented accessibility improvements according to WCAG 2.2 and WAI-ARIA.
• Integrated Didomi Consent Management as a contribution to increasing ad monetization on streaming platforms.
• Used AI-supported engineering workflows with Cursor for structured implementation, refactoring, and faster problem solving.

Technologies used: React, Next.js, TypeScript, JavaScript, GraphQL, Apollo Gateway, Zustand, Tailwind CSS, Styled Components, React Testing Library, Playwright, Jest, HTML5, CSS3, AWS Lambda, EC2, CloudFront, S3, GitLab CI/CD, NX, Cursor

• Complete greenfield rebuild across the whole stack — built AI-native: backend in Go and NestJS, PostgreSQL (CNPG) on K3s with GitOps/Terraform; frontend on Angular 22, zoneless.
• Orchestrated coding agents (e.g. Claude Code, Cursor) across the entire lifecycle — architecture, implementation, testing, reviews, documentation — driven by Specification-Driven Development (SDD).
• “Bruno” — LLM commentator persona backed by RAG and MCP for a personality that stays consistent across all generations (match previews, post-match reports, his own virtual bets).

Angular 22 (zoneless, without Zone.js), Claude Code, Claude Code Skills, CNPG, Cursor, Design Tokens (Spec for Code), Docker, Gherkin, Git, GitLab, GitOps, Go, Google Gemini, Grafana, Hetzner Cloud, K3s, Keycloak, Kubernetes, Lighthouse, LLM Integration, Model Context Protocol (MCP), NestJS, Node.js, NPM, Playwright, PostgreSQL, Prometheus, RAG, REST, Specification-Driven Development (SDD), Structured Outputs, Terraform, TypeScript, Vitest

• Developed an accessible, responsive website based on Figma designs for a major sports event in compliance with WCAG, BITV and EN 301 549
• Planned and set up the tool stack with Vite, Playwright, Docker and GitLab CI
• Worked on two existing projects (Vue.js & Nuxt), focusing on bug fixing, accessibility audits and developing new features
• Collaborated with Design and QA to consistently implement accessible UI patterns
• Advised on improving existing frontend architectures in terms of accessibility, performance and maintainability

• Founder and independent specialist at AndEvgenix Digital, focused on performance marketing, web analytics, conversion tracking, SEO, web development and e-commerce.

• Support companies with the setup, audit and optimization of their digital marketing infrastructure – from websites and e-commerce platforms to advertising, analytics and conversion tracking.

• Set up, manage and optimize Google Ads campaigns, including Search and Performance Max campaigns.

• Audit existing Google Ads accounts, campaign structures, conversion tracking and analytics setups to identify technical and performance issues.

• Implement and audit Google Analytics 4 (GA4), including events, conversions, custom tracking requirements and data collection.

• Set up and manage Google Tag Manager (GTM), including tags, triggers, variables and custom tracking implementations.

• Implement conversion and event tracking for websites, landing pages and e-commerce platforms.

• Implement Enhanced E-commerce tracking for online stores and verify correct transmission of product, cart, checkout and purchase data.

• Configure and troubleshoot cross-domain tracking for websites and services operating across multiple domains.

• Implement and audit Google Ads conversion tracking and resolve missing, duplicate or incorrectly recorded conversions.

• Set up and work with Meta Ads, Meta Pixel and conversion tracking.

• Implement and troubleshoot Meta Conversion API (CAPI) integrations.

• Analyze tracking and attribution issues across websites, GA4, Google Ads, Meta Ads and other marketing systems.

• Diagnose incorrect or inconsistent analytics data and troubleshoot technical tracking implementations.

• Create analytics and performance reports using Google Analytics 4 and Looker Studio.

• Perform SEO audits, technical SEO analysis and website optimization.

• Work with WordPress and WooCommerce on website development, maintenance, technical improvements and e-commerce projects.

• Work with Shopify and PrestaShop on e-commerce websites, tracking, integrations and technical improvements.

• Develop and optimize websites and landing pages with a focus on performance, tracking, SEO and marketing requirements.

• Work with Google Merchant Center, product feeds and e-commerce integrations.

• Configure and troubleshoot product data feeds for advertising and e-commerce platforms.

• Implement marketing, analytics and website integrations using APIs and existing platform integrations.

• Use JavaScript for tracking implementations, custom website functionality and technical integrations.

• Work with PHP and MySQL for website development, troubleshooting and custom technical tasks.

• Implement automation for marketing and business processes where repetitive manual workflows can be simplified.

• Work with both new implementations and existing setups, including audits, troubleshooting, migrations and optimization.

• Handle individual technical tasks as well as long-term projects covering websites, analytics, tracking, SEO and paid advertising.

• Work directly with clients to understand the existing setup, identify the actual technical or marketing problem and determine the required solution before implementation.

• Focus on solving the actual problem without unnecessary rebuilding or adding work that does not contribute to the project goal.

• Google certified in Google Ads, Google Ads Measurement and Google Analytics.

• Developed the “Cost Transparency” plugin for Shopware 6 that extends product details with an interactive graphic illustrating different shares of the total price

• Technologies: Shopware, PHP, Twig, CSS, JavaScript

• Building an AI-native coaching platform for cyclists: a conversational Dynamic Coach that turns training and recovery data into the next session decision, available daily instead of a static calendar.

• Designed and shipped a full-stack, chat-first coaching experience on Next.js and the Vercel Edge Network, with agentic workflows that adapt plans in real time to readiness, load, and life constraints.

• Built integrations with Garmin, Strava, Whoop, and intervals.icu so sleep, HRV, and ride data feed coaching recommendations without manual data entry.

• Product thesis: make high-quality coaching principles accessible at scale by combining adaptive training logic with plain-language conversation, not another metrics dashboard.

Key responsibility for the visual and technical frontend relaunch as well as the continued development of the platform architecture.

• Designed and continuously developed the frontend architecture, including a Figma-based Component Library and migration to Vue 3.
• Developed a robust, high-performance, component-based CSS architecture.
• Continuously optimized accessibility, Core Web Vitals, and web performance.
• Worked closely with UX, Product, and Editorial teams on design, product, and implementation decisions.

RESULT:

• WCAG-compliant
• Core Web Vitals issues resolved
• PageSpeed ~90 Desktop / ~80 Mobile

• Savills is one of the world's leading property advisors with 700+ offices worldwide. In Berlin, I built core digital solutions for the valuation business, replacing legacy Access-based workflows with an enterprise-grade web app built on Vue.js.
• Frontend Architecture & Scalability: Designed scalable Vue + TypeScript frontend architecture for internal enterprise applications, integrating a Symfony backend and interactive maps.
• Legacy Modernization: Led the modernization of legacy jQuery-based systems into maintainable Vue-driven applications, improving performance, maintainability, and efficiency across business workflows.
• PDF Report Workflow Automation: Engineered Twig-based automated PDF generation pipelines that reduced manual report preparation time by ~80%, saving approximately 12h per analyst/month.
• Design System & Frontend: Built a scalable SASS-based design system using mixins, maps, functions, and reusable UI patterns for consistency and long-term maintainability.

• Content management and SEO: Creation and management of content in the online shop (Magento) on self-diagnostics.com. Execution of search engine marketing (SEO & SEA), including Sistrix SEO analyses, on-page optimization, performance and competitor analyses.

• SEO optimization: Execution of technical SEO checks and optimization, post-relaunch SEO measures such as redirect management, link building, meta descriptions and sitemap management. Ensuring shop indexing and optimization for Google Core Web Vitals and Page Experience.

• Sales promotion measures: Planning and implementation of measures to increase visibility and sales volume, including up-selling and cross-selling strategies.

• Google and Amazon management: Configuration and management of the Google Merchant Center for various sales markets, optimization of pay-per-click campaigns (PPC) and product listings on Amazon and eBay.

• Industry: SaaS (Customer Success Management) – B2B

Comprehensive GEO implementation (Generative Engine Optimization) for a B2B CSM SaaS startup with a focus on AI Search Visibility and AI Citations in ChatGPT, Perplexity and Google AI Overviews – including a GEO workshop and a prioritized implementation roadmap.

• GEO Workshop & Roadmap: Conceptualized and delivered a GEO workshop (how LLMs work, AI Search Architecture, citation strategies); translated it into a prioritized implementation roadmap with impact/effort estimates
• Technical GEO Foundation: Robots.txt & llms.txt, Core Web Vitals & page speed, XML sitemaps for AI crawlers
• Schema & Structured Data: Gap analysis, implementation of Product/Service, FAQ, Article, Author and Organization schema, validation of coverage
• Content Architecture & GEO: Flat content architecture, topic clusters (pillar-and-spoke), 200–300 word chunks and answer-first content structure, E-E-A-T rollout through author pages
• Query Fan-Out & Prompt Anticipation: User prompt mapping, query fan-out, content gap analysis based on prompt coverage
• Citation & Backlink Strategy: AI citation analysis (news, Reddit, Wikipedia, listicles) and development of outreach and backlink strategies

Tools & technologies: Otterly.AI, PeecAI, Qforia (iPullRank), Schema Markup Validator, OpenAI Tokenizer, Prompt Coverage Monitor, ChatGPT, Perplexity AI, Semrush, Ahrefs, Framer CMS

• Backend WordPress web development.

David Reuchlein is a Shopify and Shopware freelancer from Zellingen near Würzburg. Since 2013, he has worked as a self-employed software developer and entrepreneur specializing in e-commerce and technical on-page SEO (search engine optimization). His motto: Not just hot air, but measurable results.

He builds Shopify themes in Liquid, develops plugins and theme extensions for Shopware 6 with Symfony and Twig, and supports major updates and migrations, including data transfers. He optimizes Core Web Vitals (LCP, INP, CLS) through caching, database indexes, and image formats. He connects online shops with ERP (Enterprise Resource Planning) systems, accounting software, payment providers, and marketplaces via REST and SOAP interfaces.

As a Maxcluster bronze hosting partner, he supports customers throughout Germany remotely. His reference customers include Fressnapf, BAUHELD, Helios Dr. Bulle, and gloryfeel. On ProvenExpert, he is recommended by 100 percent of reviewers.

Project for a leading German email and cloud service provider: As Senior Frontend Developer and Technical Web Architect, I developed an international, multi-tenant white-label consent management layer for multiple brands.

Main tasks:

• Architecture and implementation with Vue 3, TypeScript, and Vite
• Development of automated tests with Vitest and Playwright
• Creation of brand-specific CMP configurations, CSS themes, i18n structures, and vendor settings
• Implementation of playout and initialization logic as well as backend integration
• Technical decision support, project, and code documentation

Impact: Replacement of external CMP solutions with a reusable and long-term maintainable in-house foundation for several international brands and rollouts.

Technologies: Vue 3, TypeScript, Vite, Vitest, Playwright, IAB TCF, Google Additional Consent, i18n, Git, CI/CD.