Solving problems for a living.
01 / about
Hey there. I'm Zsolt, a developer from Čierna Voda in Slovakia, now living in Prague. I build software and I also run it in production. Today I look after a platform that delivers quality reports and data unavailability reports from Earth observation satellites on a project for the European Space Agency, aggregating validated data from ESA, legacy and third-party missions. I choose the approach, write the code, move the data, and keep the servers up.
I started out testing other people's websites, which is where I learned to care about what happens after the deploy. Since then I've picked up the unglamorous half of the job: data pipelines, Linux, networking, backups. I lean on AI heavily in my daily work and I build with it too, mostly retrieval systems and self-hosted models. Outside work there's a homelab that has grown well past what I can justify, a motorcycle, and a ski season I never get enough of.
Seneca said luck is what happens when preparation meets opportunity. That has held up so far. If you want to build something together, or just talk shop, say hello. 🔗
Hungarian (native) · Slovak (fluent) · Czech (fluent) · English (fluent)
Software Developer at Serco, Prague
I own and run a platform for the European Space Agency that delivers quality reports and data unavailability reports from Earth observation satellites: the code, the data pipelines, CI/CD, and the servers it runs on.
Certified Kubernetes Administrator (CKA)
Linux Foundation / CNCF
Ubuntu Linux Professional Certificate
Canonical · Apr 2025
Learning Bash Scripting
LinkedIn Learning · Jul 2025
Basics of ABAP Programming on SAP BTP
SAP · Oct 2024
AWS Academy Graduate, Cloud Foundations
AWS Academy · Jul 2022
02 / projects
Python · Qdrant · bge-m3 · LangChain · Docker
A retrieval-augmented search system over a local document collection, built to answer questions with citations, and to stay quiet when the evidence isn't there.
WooCommerce · B2BKing · Stock Locations · SuperFaktúra
A private B2B ordering portal implemented for a Slovak fresh-produce wholesaler, now in production. Features tiered customer pricing, a login-only catalog with hidden prices, two-warehouse inventory, decimal quantities for weighted goods, and integrated invoicing.
React Native · Expo · Vision models · FSRS
A mobile app that turns a photo of a printed page into vocabulary cards. Point the camera at text, and it pulls out the words worth learning and schedules them for review.
Linux · Docker · WireGuard · Tailscale · CI/CD
A personal VPS and home server run with production habits: private networking, atomic zero-downtime deploys, and a stack of self-hosted services.
React · TypeScript · Vite · FastAPI · OpenCV · ONNX Runtime · Docker
A personal tool for digitizing family photo albums. Scan several prints at once on a flatbed, and it finds each photo on the sheet, lets you fine-tune the boxes, and exports every crop at full resolution as a ZIP.
Virgo / GCM Cloud CMS
Content migration and restructuring for five Slovak municipal websites, including bilingual Slovak and Hungarian content.
03 / experience
Feb 2025 - Present
Prague
Serco Czech Republic s.r.o.
Own and run, end to end, a platform for the European Space Agency that delivers quality reports and data unavailability reports from Earth observation satellites, aggregating validated data from ESA, legacy and third-party missions.
Choose the approach, technologies and architecture for new work, present it, build it, take it through UAT to production, and keep it running: monitoring, fixes, patches and backups.
Develop the frontend, the backend and the data ingestion pipelines, and maintain the automation scripts around them.
Administer the platform's two Ubuntu servers: containers, CI/CD, updates, backups, access control and regular vulnerability remediation under formal change control.
Led the migration of a legacy service from Ubuntu 18.04 to a new Ubuntu 24.04 LTS server: dockerised the legacy codebase so it runs on the new host, closed the outstanding vulnerability findings and brought the server under regular patching, and replaced a manual multi-step deployment with a single automated, zero-downtime release.
Led a phased frontend quality programme: vendor bundle cut by roughly three quarters, JavaScript payload down a third, CSS down more than half, unnecessary re-renders reduced by 80%.
Work directly with the mission teams and IT on requirements, solution proposals, bug reports, change records and estimates.
2022 - 2025
Remote
Galileo Corporation s.r.o
Conducting thorough manual testing of web pages to verify that all features operate correctly across various browsers and devices. Identifying and reporting discrepancies or bugs promptly.
Assessing the visual appearance of web pages to ensure they match the provided graphic design specifications. Communicating deviations to the relevant team members and providing detailed feedback for necessary corrections.
Maintaining high standards of quality by rigorously testing web pages, ensuring they meet required specifications and user expectations.
Collaborating effectively with designers, developers, and project managers to address issues found during testing and offering suggestions for improvements and clarifications.
Managing all tasks independently while adhering to strict deadlines and utilizing effective time management skills to complete tasks efficiently and accurately.
Maintaining detailed records of test results, issues identified, and corrective actions taken, and providing comprehensive reports to relevant stakeholders.
04 / contact