systems that hold their shape under load
Ilija Uzelac —
backend engineer
& SaaS architect.
Known as lumenko, I design and build the backend of SaaS platforms — scalable databases, secure APIs, and dependable pipelines. I focus on the systems nobody sees until something breaks. I'd rather they didn't.
$ whoami
Senior backend engineer | PHP/Laravel Expert
$ role --current
tech lead & mentor
$ uptime --session
00:00:00
$
01 — about
"I'm driven by the challenge of building systems that scale, from optimizing queries under pressure to designing APIs that are secure by default."
I thrive on crafting clean code, mentoring teams, and untangling complex architectural problems. The intersection of code quality, performance, and pragmatism is where I do my best work.
When I'm not deep in a codebase, I'm usually advocating for better practices, reviewing a teammate's design doc, or helping someone else level up. Good teams build good systems.
What I build with.
languages & frameworks
- PHP & JavaScript my languages of choice
- Laravel modern web applications
- MySQL schema design & query tuning
- Linux production environments & devops
infrastructure & devops
- Cloud architecture scalable, resilient systems
- CI/CD pipelines automated testing & deployment
- Security application hardening & compliance
- Docker containerization & microservices
To the table.
- Backend architecture — designing systems that grow with the business, not against it.
- API development — secure, well-documented, RESTful APIs that other teams actually enjoy consuming.
- Database optimization — efficient queries and schemas that stay fast as data grows.
- Security first — best practices baked in from day one, not bolted on after an incident.
- Team leadership — mentoring developers and raising the bar on code standards.
- DevOps & automation — CI/CD pipelines and infrastructure as code.
Currently exploring.
- advanced system design & architecture patterns
- modern security practices & threat modeling
- performance optimization at scale
- AI integration in backend systems
Beyond code
- Mentoring — helping developers grow and succeed
- Animal welfare advocate
- Vegetarian — living sustainably
- Forever learning — the field never stops
05 — connect
Let's build something
amazing
together.
Open to conversations about backend architecture, mentoring, or just talking shop.