01 / SOFTWARE
Full-stack product engineering
PHP, Laravel, Symfony, React, TypeScript, Vue, Node.js and Python — APIs, interfaces, integrations and legacy modernization.
PHPReactTypeScriptLaravelNode.jsPython
ZOLTAN_OS 15.0
full-stack · cloud · AI · production
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SELECTED SYSTEMS / 02
Built, shipped and operated.
Real production screenshots. Click a project for the technical story.
360° ENGINEERING / 03
Not one layer. The whole delivery chain.
Application code, interfaces, infrastructure, automation, AI and acquisition.
02 / PLATFORM
Cloud & production infrastructure
DigitalOcean and AWS, Linux, Docker, Nginx, CI/CD, TLS, monitoring, deployment gates and rollback-aware production delivery.
DigitalOceanAWSDockerLinuxNginxGitHub Actions
03 / INTELLIGENCE
AI-assisted development
AI is part of the engineering workflow: Codex-style development, local Ollama models, agent-oriented tooling, automation and retrieval-driven experiments.
OllamaLocal LLMAgentsRAGCodexAutomation
04 / GROWTH
Marketing technology
Google Ads landing pages, consent-aware conversion tracking, campaign sites, SEO, PageSpeed and measurement built into the delivery process.
Google AdsConsentTrackingSEOPageSpeedLanding pages
ENTERPRISE DELIVERY / 04
From global companies to public institutions.
Selected engagements where scale, integration, governance or infrastructure mattered.
Cybersecurity governance, NIS2/CRA/TISAX readiness, evidence management and C-level risk reporting.
API-first platform modernization with 20+ authentication, payment and ticketing integrations.
EU-scale enterprise web delivery in a multinational public-sector environment in Brussels.
Senior team lead / lead PHP delivery across web, mobile, integrations and cloud-backed enterprise products.
Employee application with headless architecture, React Native, SSO and scalable AWS infrastructure.
Enterprise product delivery as part of the London BREAD engagement.
DELIVERY FOOTPRINT / 05
Projects without one timezone.
A schematic view of places connected to long-running projects, teams and client delivery.
USANorth America
EUROPEEurope
Seattle, WAChicagoKentuckyLondonBrusselsGhentSwitzerlandKyiv
LINKEDIN RECOMMENDATIONS / 06
What people I worked with say.
Recommendations from managers, teammates and a long-term client across more than a decade of delivery work.
I had the opportunity to work closely with Zoltan during his time as our Drupal Developer Lead on our Enterprise Developer Portal team. From day one, Zoltan brought a strong command of web technologies — particularly Drupal, HTML, CSS, Javascript, etc. — and consistently applied that technical expertise to build and maintain a stable, scalable, and user-friendly portal experience. He was quick to troubleshoot complex issues, thoughtful in his approach to implementation, and always made sure that his work aligned with broader team goals and product standards, not just for the present but also thinking long-term for the future.
Beyond his technical strengths, Zoltan was a true team player. He approached our project with a positive attitude and brought a great sense of humor that helped create an open and comfortable team dynamic. This made it easier for team members to voice concerns, collaborate more freely, and problem-solve effectively. His ability to combine deep technical knowledge with approachability and reliability made him an invaluable part of our success. I’d gladly recommend Zoltan to any team looking for a strong technical leader and collaborator.
I had the pleasure of working with Zoltán, and I was consistently impressed by his technical skills and problem-solving abilities. He has a thoughtful and approachable personality that makes collaboration easy and effective. Whenever challenges arose, he was quick to offer practical solutions and helpful insights. His dedication and ability to consistently deliver high-quality work make him an exceptional developer and a great team player.
Zoltan is very passionate and experienced in drupal, also he is a hard working person especially when it concerns of finding a solution to any bug. He is very supportive, always ready to answer any question and explain all the details. We had good cooperation and communication in the team from the very beginning. I was lucky enough to have a chance to work with him :)
Working with Zoltán was a pleasure. He's hard working, positive and an incredibly good problem solver. I would highly recommend him.
I worked with Zoltan who wrote the php and drupal code for an app I was working on. He was professional an diligent at all times. He took time to think of the best solution to the problem. Both professionally and personally Zoltan was fantastic to be around and I would highly recommend him in any team
It was fun to work with Gambino. If you need a talkative & creative character in your team, you must hire him! While he has years of web development experience, he is open to learn new things, and willing to take even the toughest assignments. I have found his JavaScript knowledge very valuable in our project, and I will never forget these few months we have worked together.
Zoltan is an excellent programmer, making quick and quality work. Effective in independent work, but good teamplayer if it is needed. He doesn't let problems remaining open.
Great worker.
I have enjoyed working with Zoltan.
Recommendations are reproduced from their original LinkedIn text. LinkedIn ↗
WORKLOG / 07
The engineering work behind the finished work.
Engineering notes from 2026: bugs, dead ends, releases, decisions and the lessons that survived the fix.
The alpha.10 image pipeline exposed a lifecycle CLI regression. The fix restored the upgrade path and added a real test so the code remembers the failure.
Read note →A first optimization direction went too far. The design came back; the heavy runtime did not. The lesson became part of the platform work that followed.
Read note →PageSpeed reporting, Lighthouse fallback, exact release SHAs and post-deploy exit codes turned performance checks into useful evidence instead of CI roulette.
Read note →