Simo Jaković

Software Architect & Hands-on Engineer
Belgrade, Serbia · working with US teams

I am an independent software architect and hands-on engineer. I design and modernize backend systems - payment and ledger flows, government platforms, and enterprise ERP - and I write the code that ships them. 15+ years on systems that have to stay correct under load, audit, and growth.

Most of my work has been on systems where being wrong is expensive: cross-border toll collection and settlement for a state road authority, government service platforms, an SEC-registered US securities exchange, and the ERP and billing systems that sit behind all of it. That work is why I care more about correctness under audit than about the current architecture fashion.

I am an architect who never left the codebase. I write the migration, review the pull requests, and sit in the incident call. A design I cannot implement myself is a design I do not trust, so the diagrams and the commits come from the same person.

I work as an independent consultant. When a project needs more hands, I bring in specialists I have worked with before and stay accountable for delivery.