Zagreb, Croatia · Antwerp, Belgium

Sandi Slonjšak

Hey, I'm Sandi — I founded Code Of Us, a software agency built to turn business needs into smart, easy-to-use tech.

"Building software agencies that actually work — for clients and for the people inside them."

About

Sandi is the founder behind Code Of Us, a software agency he built from the ground up with offices in Zagreb, Croatia and Antwerp, Belgium. He's the kind of person who thinks carefully about where the industry is heading — his writing on AI, developer relevance, and agency business models shows someone who isn't just reacting to change, but trying to get ahead of it.

Running a software agency means wearing a lot of hats, and Sandi seems genuinely comfortable in that role — equal parts technologist, business operator, and client partner. Code Of Us is designed to be big enough to handle ambitious projects, small enough to provide personalized care. That balance says a lot about the culture he's trying to build.

He's also an active writer, publishing regularly on LinkedIn about topics ranging from how developers can stay relevant in an AI-first world to what makes a great client-agency relationship. Sharing what he's learned is clearly just as important to him as the work itself.

Experience

CEO & Founder

Code Of Us — Present

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Founded and leads Code Of Us, a software agency with offices in Zagreb, Croatia and Antwerp, Belgium. The agency specializes in delivering web applications and digital solutions that help businesses digitalize and optimize their operations.

Works with clients across industries, managing projects end-to-end — from requirements gathering and discovery through to production deployment. Key deliverables include custom web platforms, onboarding flows, and payment integrations for clients in EdTech and beyond.

— Scaled the agency to a two-country operation (Zagreb + Antwerp)
— Delivered a reliable, scalable 1-on-1 online tutoring platform praised for its smooth production release
— Helped clients generate measurable B2B results, including 208 registrations from a single campaign
— Publishes regularly on LinkedIn covering AI, developer careers, and agency strategy

Skills

Leadership & Business

Agency Founding & Operations, Team Leadership, Client Relationship Management, B2B Business Development

Technical

Web Application Development, Custom Software Development, AI Tools & Workflows, Product Strategy

Thought Leadership

Technical Writing, LinkedIn Publishing, Developer Education, Industry Commentary

Project Delivery

Project Management, Requirements Gathering, Production Deployment, Onboarding & Payment Integration

Projects

Code Of Us

codeofus.com →

Built and scaled a software agency with a dual presence in Croatia and Belgium. The agency delivers custom web platforms, handles onboarding and payment integrations, and produces scalable solutions for clients including EdTech companies and others across various sectors.

Education

Tehničko veleučilište u Zagrebu

Zagreb University of Applied Sciences