01 · Identity
Single sign-on and fine-grained access control
Built as a junior: SAML login because NIS2 forced us, then a named permission for every endpoint, grouped into roles like Operator, Driver and Admin.
Read the story →full-stack & DevOps · Budapest · Remote/On-site
I like working on every layer, even as a hobby
At work: Spring Boot, React/TypeScript, AWS and DevOps side that keeps the app running. After hours: Linux internals, KVM and Wayland tooling, playing with AWS. I just like to build systems, found it interesting, gives you full control.
My usual stack, and why each piece is there
click around →
Services
Spring Boot
Where the actual business logic lives. Clear module boundaries, JPA/Hibernate for persistence, unit/integration tests against real database, and metrics from day one.
Things I've shipped
Work projects, anonymized where they need to be.
02 · Frontend
Upgrading the whole frontend stack
React 18 → 19, MUI 5 → 9, React Router 6 → 7, TypeScript 5 → 6, ESLint 8 → 9: about 20 major upgrades in one go, with 10 outdated packages dropped or replaced along the way.
03 · DevOps
Keeping the platform running
Aside from programming, I help run the test and production environments: EC2 infrastructure in Terraform, containerized services on Docker and Kubernetes, deployments through Jenkins, daily maintenance and data fixes, and looking for bugs in Graylog and Grafana. Plus a Jira Service Management portal for company-wide internal requests.
After hours
Things I built
windows-gaming-vm-linuxA Windows 11 VM on Linux with my own patched KVM module. Tuning the host cut worst-case vCPU preemption 3.3×.C · Bash · KVM · QEMU wlcrosshair-guiwlcrosshair had no GUI, so I made one: config editor, crosshair generator, live controls.Rust · Tauri · React apartment-telegram-monitorGood Budapest flats disappear in hours, so a bot watches the listings and pings me on Telegram.Python · Playwright
About
I'm David Bali, ShiroYasha online. I'm a backend-leaning full-stack developer in Budapest, on a team of four, working across Spring Boot services, React/TypeScript frontends and AWS. I like building a feature from the schema to the screen.
After hours I like to tune Linux: KVM and GPU passthrough, Wayland tooling, homelab in progress with OPNsense and PI-hole. Security is next on the list.
JavaSpring BootJPA / HibernateReactTypeScriptAWSAurora · RedshiftSAML / SSODocker · KubernetesTerraformJenkinsGrafana · GraylogLinux
Say hi.
Whether it’s a role, a project or just a question, feel free to contact me: