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I’m a Senior/Staff Full-Stack Engineer and former CTO with 20+ years of experience architecting, scaling and stabilizing high-traffic SaaS, FinTech, AdTech and ecommerce platforms. I’ve delivered €1M+/month funnels, €500K+/month payment systems and platforms supporting 50k–150k active users. I combine backend engineering, DevOps, cloud architecture and AI automation with strong business and product sense. I’m known for scaling platforms under pressure, modernizing legacy systems and improving performance. I enjoy leading cross-functional teams, mentoring engineers and aligning technology decisions with business goals to drive measurable impact.…I’m a Senior/Staff Full-Stack Engineer and former CTO with 20+ years of experience architecting, scaling and stabilizing high-traffic SaaS, FinTech, AdTech and ecommerce platforms. I’ve delivered €1M+/month funnels, €500K+/month payment systems and platforms supporting 50k–150k active users. I combine backend engineering, DevOps, cloud architecture and AI automation with strong business and product sense. I’m known for scaling platforms under pressure, modernizing legacy systems and improving performance. I enjoy leading cross-functional teams, mentoring engineers and aligning technology decisions with business goals to drive measurable impact.

Hans van de Mosselaer

Full Stack Developer, Web Developer, Back-End Developer, +4

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I’m a Senior/Staff Full-Stack Engineer and former CTO with 20+ years of experience architecting, scaling and stabilizing high-traffic SaaS, FinTech, AdTech and ecommerce platforms. I’ve delivered €1M+/month funnels, €500K+/month payment systems and platforms supporting 50k–150k active users. I combine backend engineering, DevOps, cloud architecture and AI automation with strong business and product sense. I’m known for scaling platforms under pressure, modernizing legacy systems and improving performance. I enjoy leading cross-functional teams, mentoring engineers and aligning technology decisions with business goals to drive measurable impact.…I’m a Senior/Staff Full-Stack Engineer and former CTO with 20+ years of experience architecting, scaling and stabilizing high-traffic SaaS, FinTech, AdTech and ecommerce platforms. I’ve delivered €1M+/month funnels, €500K+/month payment systems and platforms supporting 50k–150k active users. I combine backend engineering, DevOps, cloud architecture and AI automation with strong business and product sense. I’m known for scaling platforms under pressure, modernizing legacy systems and improving performance. I enjoy leading cross-functional teams, mentoring engineers and aligning technology decisions with business goals to drive measurable impact.

Available to hire

I’m a Senior/Staff Full-Stack Engineer and former CTO with 20+ years of experience architecting, scaling and stabilizing high-traffic SaaS, FinTech, AdTech and ecommerce platforms. I’ve delivered €1M+/month funnels, €500K+/month payment systems and platforms supporting 50k–150k active users. I combine backend engineering, DevOps, cloud architecture and AI automation with strong business and product sense.

I’m known for scaling platforms under pressure, modernizing legacy systems and improving performance. I enjoy leading cross-functional teams, mentoring engineers and aligning technology decisions with business goals to drive measurable impact.

Skills

Experience Level

Expert

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Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

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Intermediate

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Intermediate

Language

English

Fluent

Dutch

Fluent

Spanish; Castilian

Beginner

Work Experience

Senior Full Stack Developer & Tester at Magento Development & QA – 3WebApps

March 1, 2023 - Present

Programmed and optimized Magento modules, enhancing shop functionality and performance. Reviewed and tested modules for security, compliance, and performance before deployment. Designed and executed QA processes (manual + regression), ensuring production-ready releases. Improved CI/CD pipelines and Agile workflows (Jira, GitLab), reducing deployment time by 30%. Architected and maintained multi-server infrastructure, ensuring 99.95% uptime. Collaborated with engineers via GitHub, GitLab, and Bitbucket.

CTO & Senior Full Stack Developer & Server Administrator at United Gurus

February 28, 2023 - October 16, 2025

Founded and scaled a fully remote consulting company, serving global e-commerce brands in Cosmetics, Car Care, and Pet niches. Programmed and architected funnels generating €1M+ monthly revenue. Built AI-driven automation systems (OpenAI API) and advanced ad tracking for Google, Facebook, and TikTok. Cut page load times by 64% (4.2s → 1.5s), driving measurable conversion improvements. Increased checkout completion by 22% via optimized UX and payment flows. Boosted funnel conversions by 30% with A/B testing frameworks. Directed distributed client projects, balancing CTO leadership with hands-on programming in PHP, JavaScript, and API integrations. Managed remote collaboration workflows with Slack, Jira, GitHub, and Zoom across international teams.

Senior Full Stack Developer at Direct Investments

July 31, 2016 - October 16, 2025

Engineered payment gateways processing €500K+ monthly transactions (+45% capacity). Reduced payment failure rates by 12% via backend optimizations. Migrated infrastructure, decreasing downtime by 90%. Scaled affiliate platforms to support 50K+ active users (+70% growth). Programmed backend systems in PHP/JavaScript to scale affiliate platforms supporting 50K+ users.

Junior Developer at Parwati Outsourcing

January 31, 2011 - October 16, 2025

Increased server uptime from 93% → 99.8% (+6.8% reliability gain). Improved referral system, raising CTR by 18%. Reduced downtime incidents by 75% through infrastructure upgrades. Programmed affiliate tracking systems in PHP/JavaScript, improving accuracy by 20%.

Senior Full Stack Developer & Tester at 3WebApps

March 1, 2023 - Present

CTO & Senior Full Stack Developer & Server Administrator at United Gurus

February 1, 2023 - October 16, 2025

Senior Full Stack Developer at Direct Investments

July 1, 2016 - October 16, 2025

Junior Developer at Parwati Outsourcing

January 1, 2011 - October 16, 2025

Full Stack Developer & Tester | Magento Development & QA at 3WebApps

March 1, 2023 - Present

CTO & Full Stack Developer & Server Administrator | E-Commerce Growth & AI Automation at United Gurus

September 1, 2016 - February 28, 2023

Founded and scaled a fully remote consulting company, serving global e-commerce brands in Cosmetics, Car Care, and Pet niches. Programmed and architected funnels generating €1M+ monthly revenue. Built AI-driven automation systems (OpenAI API) and advanced ad tracking for Google, Facebook, and TikTok. Cut page load times by 64% (4.2s → 1.5s), increasing conversions; improved UX and payment flows boosting checkout completion by 22%; expanded funnel conversions by 30% with A/B testing. Managed distributed client projects and remote teams.

Full Stack Developer at Direct Investments

January 1, 2011 - July 31, 2016

Engineered payment gateways processing €500K+ monthly transactions (+45% capacity). Reduced payment failure rates by 12% via backend optimizations. Migrated infrastructure, decreasing downtime by 90%. Scaled affiliate platforms to 50K+ active users (+70% growth). Programmed backend systems in PHP/JavaScript to scale affiliate platforms.

Developer | Affiliate Tracking & IT Infrastructure at Parwati Outsourcing

November 1, 2008 - January 31, 2011

Senior Full-Stack Developer & QA Engineer at 3WebApps

March 1, 2023 - Present

Program and optimize Magento modules to improve shop functionality and performance; security, compliance and performance testing before production deployment; designed and executed QA processes including regression testing; improved CI/CD pipelines reducing deployment time by 30%; architect and maintain multi-server infrastructure with 99.95% uptime; collaborate with distributed teams via GitHub, GitLab and Bitbucket.

CTO & Full-Stack Developer & Server Administrator at United Gurus

September 1, 2016 - February 28, 2023

Founded and scaled a global e-commerce consultancy serving multiple industries; architected funnels generating €1M+ monthly revenue; built AI-driven automation using OpenAI API; implemented advanced advertising tracking across Google, Meta & TikTok; reduced page load times by 64% (4.2s → 1.5s); increased checkout completion by 22% and funnel conversion by 30%; led distributed international engineering and client teams.

Full-Stack Developer at Direct Investments

January 1, 2011 - July 1, 2016

Engineered payment gateways processing €500K+ monthly transactions; reduced payment failure rates by 12%; migrated infrastructure decreasing downtime by 90%; scaled affiliate platforms to support 50K+ active users (+70% growth); developed backend systems in PHP and JavaScript.

Developer at Parwati Outsourcing

November 1, 2008 - January 1, 2011

Increased server uptime from 93% to 99.8%; improved referral system CTR by 18%; reduced downtime incidents by 75%; developed affiliate tracking systems improving accuracy by 20%.