I will design your software architecture and be your fractional cto

C
crystaliumhr
C
crystaliumhr
Antun N.

About this gig

  • Are you building a product and need senior-level technical guidance without hiring a full-time CTO? I can help.

I'm a full-stack software architect with 10+ years of experience, having worked with companies like Nike and Philips. I specialize in designing scalable systems, selecting the right tech stack, and providing CTO-level strategic direction.


What I offer:

  • Software architecture design (microservices, monolith, serverless)
  • - Tech stack selection and evaluation
  • - System design for scalability, performance, and security
  • - Code architecture review and refactoring guidance
  • - Cloud infrastructure planning (AWS, serverless, Lambda)
  • - Technical roadmap and engineering team guidance
  • - Startup CTO consultation - from idea to production

My stack: Node.js, TypeScript, React, Next.js, AWS, PostgreSQL, Redis, Docker


Whether you're a startup founder, product manager, or engineering lead - I'll help you make the right technical decisions from the start and avoid costly mistakes down the road.


Let's talk about your project.

Get to know Antun N.

Antun N.

Full Stack Developer and AI Expert

  • FromCroatia
  • Member sinceJun 2026
  • Avg. response time1 hour
  • Languages

    English
I am a full-stack developer and founder of Crystalium, a software agency based in Sibenik, Croatia. With 10+ years of experience, I build custom web applications, e-commerce platforms, and AI-powered tools for clients across Croatia and the EU. My stack includes Next.js, React, TypeScript, Node.js, Python, and PostgreSQL. I specialize in web development, AI integration (OpenAI, Anthropic, LangChain), and custom software solutions. I take pride in clean code, clear communication, and delivering real results.