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// Software architect & hands-on engineer · 15+ years

Backend systems,
designed and modernized.

Jakovic Engineering · Software architecture & engineering · Belgrade, Serbia

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.

~/whoami
$ whoami
simo jaković - software architect
           and hands-on engineer

$ stack --core
php      laravel  symfony
node     next.js  react
postgres

$ locale
belgrade (CET) · 9am-3pm ET overlap

$ status
● available · independent consultant
// Services

What I do

All services →
// legacy-modernization

Legacy modernization

Aging systems taken forward without a rewrite gamble: strangler migrations, framework and runtime upgrades, data model repair, and a path your team can keep shipping on.

// architecture-review

Architecture and code review

A senior second opinion on the design, the codebase, and the scaling plan - with the trade-offs, the risks, and what I would do first, written down.

// contract-development

Contract development

Senior capacity for an existing team. I take real tickets, review pull requests, and ship in your process rather than alongside it.

// ai-integration

AI integration

LLM features built into systems that already exist: retrieval over your own data, evaluation before rollout, cost and latency budgets, and a fallback for the day the model is wrong.

// Clients
// Selected work

Case studies

Backend systems under load, audit, and regulation.

All work →
Putevi Srbije 2022-present

T4A - Cross-border electronic toll collection

A distributed tolling platform settling millions of transactions across five jurisdictions, plus the ERP that invoices and reconciles them.

phplaravelpostgresql
Read the case study →
Boardius 2025-present

Governance platform architecture and AI automation

Full-stack architecture and API layer for a modern governance platform, with AI-driven automation that removes manual workflow steps.

next.jsnode.jsreact
Read the case study →
LTSE 2022-2023

Application architecture for an SEC-registered exchange

Backend and frontend architecture for a US national securities exchange, built and operated under SEC regulatory and audit requirements.

reactlaravelpostgresqlheroku
Read the case study →
// Company

Who you are hiring

Jakovic Engineering is the registered consulting practice of Simo Jaković, based in Belgrade, Serbia.

I have spent 15+ years on systems that have to be right: cross-border toll collection, government platforms, a regulated US exchange, and enterprise ERP. I do the architecture and I stay in the codebase - the design decisions and the pull requests 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.

// Company details
Trading name
Jakovic Engineering
Legal name
SIMO JAKOVIĆ PR RAČUNARSKO PROGRAMIRANJE JAKOVIĆ INŽENJERING BEOGRAD
Address
Paunova 84, 11000 Belgrade, Serbia
Company ID
66675009
Tax ID (PIB)
113234068
Activity code
6201 (computer programming)
// Contact

Let's discuss your next project

Based in Belgrade (CET). Overlapping 9am - 3pm ET.

Get in touch simo@jakovic.com ↗