WHO I AM
About
- ROLE
- Senior full-stack & tech lead
- BASED
- Zagreb, Croatia
- EXPERIENCE
- Since 2015
- EDUCATION
- MSc in Computing, FER Zagreb
- COMPANIES
- 5
- PROJECTS
- 20+
- CURRENTLY
- Co-founder & CTO, Kord
I'm a senior full-stack engineer and tech lead in Zagreb, and I genuinely love building software. Since 2015, across 20+ projects in banking, telecom, public transit and enterprise security, I've shipped real-time chat for banking apps, led Zoom-style video calls for a virtual conference platform at the height of COVID-19, and built one codebase shared by web, iOS and Android. Along the way I've learned what it takes to ship software that lasts. Today I'm the co-founder and CTO of Kord, a multi-tenant SaaS platform where security and data isolation come first. I designed and built the web app, the API, the infrastructure and every third-party integration it runs on.
WHAT I DO
I build end to end: web apps, hybrid mobile apps in React Native, APIs, databases and the cloud infrastructure underneath. I lead hands-on, too. I helped set Infinum's MVVM standard for Android, taught Productive's engineers TypeScript and coached Toptal's team on writing tests that actually catch bugs. As tech lead at SandboxAQ, I rolled out TypeScript, ESLint and structured code review across teams. Today my edge is architecture built for AI: clear contracts, strict types, shared schemas and real tests, so AI agents write high-quality code from day one and I deliver what used to take a whole team, without lowering the bar.
SKILLS
WEB
TypeScript is where I'm most fluent: React and TypeScript since 2018, starting at Infinum. I led Productive's move from JavaScript to TypeScript in a large Ember app, built Toptal's Electron desktop app for its freelancers, and today build Kord's web app and Alma Sfera's booking site: accessible components on React Aria, forms on TanStack Form with Zod, and a Storybook story for every component. Outside TypeScript, my favorite stack is Elixir with Phoenix LiveView, for the speed it gives me from idea to production.
- React
- TypeScript
- HTML5
- CSS Modules
- Tailwind CSS
- React Native
- Expo
- Next.js
- TanStack Query
- TanStack Form
- React Aria
- Vite
- Webpack
- Storybook
- Jest
- Vitest
- Phoenix LiveView
- Electron
- Ember.js
- Angular
- Material UI
BACKEND
Kord's API runs on Bun and PostgreSQL, with Zod contracts declared once and shared end to end. A renamed field fails the build instead of breaking a screen in production. Every hour is priced when its shift is saved, so a closed month never moves. At SandboxAQ, I put AQtive Guard's integrations with AWS, CrowdStrike and ServiceNow behind one pattern for retries, rate limiting and errors. I moved the long-running work onto async pipelines on Redis Queue, Temporal and Kafka, and swapped the ORM's SQL for targeted raw SQL on the hottest GraphQL queries.
- Bun
- Node.js
- Express
- NestJS
- PostgreSQL
- Knex
- Zod
- GraphQL
- Python
- Flask
- Go
- Kotlin
- Elixir
- Phoenix
- Temporal
- Kafka
- Redis
- MySQL
- MongoDB
- REST
- WebSockets
- JWT
- Stripe
- Seam
- Brevo
- FCM
INFRASTRUCTURE
Great engineering is knowing what not to build. I design systems that handle real load on lean infrastructure and save the complexity for problems that genuinely need it. I run Kord and Alma Sfera in production myself: a git tag runs the full test suite, builds the Docker images and ships them behind nginx and Cloudflare, with hourly backups and a daily restore check. At SandboxAQ I set up a new service's infrastructure with the DevOps team on Kubernetes and Terraform.
- Linux
- Docker
- GitHub Actions
- CircleCI
- Bazel
- nginx
- Cloudflare
- DigitalOcean
- Kubernetes
- Terraform
- AWS
- GCP
AI
I built kormanjonac, an AI engineering setup on Claude Code with house rules, 10+ skills and a shared knowledge base of recipes reused across every project. It plans features with me, draws the designs on a canvas, builds in parallel and opens pull requests with tests that I review and merge. It learns from every correction, runs a weekly review of its own work, cleans up after itself and works inside a sandbox, so it moves fast without breaking production.
- Claude Code
- AI agents
- MCP
- Playwright
- Code review
HOBBIES
When I'm not coding, you'll find me at a board game night, gaming, at the gym, playing music, or building a side project just for fun.