WEB↗
Web & backend engineering
I build web applications and services from the data model to the last endpoint. PHP/Nette, Composer, Node.js and TypeScript, REST APIs, realtime communication, workers, cron, integrations and complex business logic.
SOFTWARE ENGINEER / END-TO-END BUILDER
I design and build software as a whole.
From the first architecture sketch through web, backend and native mobile apps to databases, AI layers, Docker and production infrastructure. I enjoy large projects where understanding the whole technical system matters.
STARTUPS→ENTERPRISE→PRODUCTION
END-TO-END / SYSTEM VIEW
OWNERJZSOFTWARE ENGINEER
01WEBPHP · Nette · Node.js
02MOBILESwift · Kotlin
03AILLM · RAG · Automation
04OPSDocker · Debian
I am not a one-layer specialist. I bring the most value when I can understand the problem, design the architecture and own the path from the first database table to production operations.
01 / EXPERTISE
Strong across the whole stack.
Specific technologies matter. Knowing when and why to use them matters even more.
MOBILE↗
Native mobile apps
Native mobile apps are one of my strongest disciplines. I use Swift and SwiftUI for iOS, and Kotlin with Jetpack Compose for Android. I cover app architecture, networking, local data, authentication, push notifications, location, deep links, Firebase, and delivery to the App Store and Google Play.
DATA↗
Data & databases
Data models, migrations, indexes, performance and long-term maintainability. PostgreSQL, MySQL, MSSQL, Redis and larger data workloads. When a system is slow, I find the bottleneck instead of blindly adding hardware.
AI↗
AI & LLM engineering
I integrate AI as part of real software: OpenAI API, structured outputs, embeddings, RAG, semantic search, document extraction and classification, AI workflows and automation. The model is a system component, not a chatbot bolted on at the end.
INFRA↗
Infrastructure & self-hosting
I can build an application and keep it running. Debian/Linux, Docker, Apache/reverse proxy, SSL, deployment, process management, monitoring, logs, backup/recovery and distributing services across servers based on real load.
ARCHITECTURE↗
Architecture & large systems
On larger projects I start with the system, not the framework. Modules, responsibility boundaries, API contracts, data, permissions, integrations, scaling, operations and room for future change. I can design and own a large technical part independently.
02 / SYSTEM VIEW
Everything connects.
This is the part you can play with. Pick a module and explore its technical context.
03 / HOW I WORK
One project. Five layers of ownership.
I bring the most value where shipping one screen is not enough. I need to understand the problem, design the solution and carry it into real production.
Understand the problem
Users, business, processes, data and the actual reason the software should exist.
Design the whole
Architecture, data model, APIs, permissions, integrations, infrastructure and trade-offs.
Build the product
Web, backend, native mobile apps, realtime services, automation and AI according to what the product really needs.
Take it to production
Deployment, servers, Docker, monitoring, logs, backups, security and operational ownership.
Keep it fast and healthy
Caching, Redis, workers, DB/API optimisation, workload separation, multiple instances and load balancing.
04 / PRODUCTION
I can build it. And keep it running.
Source code is not where my job ends. I handle deployment, servers, databases, performance, monitoring, backups, incidents and further development. That changes how I design software from day one.
Consumer & community productsEnterprise & internal systemsGreenfield & legacy modernizationLong-term production operations
web PHP / Nette / Composer / Node.js / TypeScriptmobile Swift / SwiftUI / Kotlin / Jetpack Compose / Firebasedata PostgreSQL / MySQL / MSSQL / Redisai LLM / RAG / Embeddings / Automationops Docker / Debian / Reverse proxy / Monitoringsystem Architecture / APIs / Integrations / Scaling
05 / EXPERIENCE
Startup speed. Enterprise responsibility.
I have worked on projects for startups and large companies — products people use every day as well as internal systems that daily business operations depend on. I work well in teams, but I can also independently own a large technical area.
06 / SELECTED WORK
Less promise. More real systems.
I have worked with startups and larger companies on systems and products used every day. Some projects are intentionally presented without client names; I’m happy to share specific references and context when discussing a potential collaboration.
An internal platform for day-to-day business operations
Design and long-term development of multiple modules for documents, workflows, reporting, finance, property operations and other internal processes. ERP and system integrations, roles and permissions, automation, imports, production operations and gradual modernization of legacy components.
PHP · Nette · PostgreSQL · MSSQL · REST API · OCR · Integrations · Docker · Debian
ROLEArchitecture · development · integrations · operations
A community product from backend to native apps
Backend, APIs and product features for a community platform with feeds, profiles, comments, notifications and location-based functionality. Native mobile apps for iOS and Android, push notifications, authentication, realtime features and self-managed production infrastructure.
Swift · SwiftUI · Kotlin · Jetpack Compose · Node.js · TypeScript · Firebase · REST · WebSockets
ROLEEnd-to-end product development
Systems that have to process data and survive production
APIs and backend services for integrations, location/GPS data and higher request volumes. Database design, caching, background processing, workload distribution, monitoring and bottleneck analysis across application, database and infrastructure layers.
Node.js · TypeScript · PostgreSQL · Redis · APIs · Background jobs · Monitoring · Scaling
ROLEBackend · data · performance · infrastructure
REFERENCES
I’m happy to share specific client references and more detailed project context when discussing a potential collaboration.
Building something bigger?
A new product, a complex internal system, a mobile app, legacy modernization or a project that needs someone to own a larger technical whole. Get in touch.