Reactor is an AI-driven product and venture studio that thrives on big ideas, quick action, and a tight-knit community of builders, founders, and operators.
Zagreb, Croatia
History
We started in 2015 as a small product team solving complex digital problems. Today, Reactor works with founders, scaleups, and enterprise teams to turn ideas into products — and products into real businesses. Our mindset can be distilled into four points:
- 1
Small teams can outperform large organizations
AI changed the speed and economics of building.
- 2
Most ideas should fail early
Validate and build the right ideas, at the right time.
- 3
Fast validation beats slow execution
The best work happens when building together.
- 4
Community compounds over time
The strongest ecosystems are built long before they’re needed.
Reactor by the numbers
- 01
Our strong team cohesion, trust, mutual respect enabled us to prosper through the years, learning and growing from each experience.
10 years together
- 02
With +160 years of combined experience, we are a force to be reckoned with, carrying initiatives, empowering others for impact.
20 experts
- 03
Recognised and awarded for our excellence and continuous significant impact to our partners businesses.
Deloitte Fast 50
Built by senior operators, designers, and builders.
- 01 — 13
Neven Vuger
Product Design Lead
The MVP for your MVP
- 12 years of experience
- Countless design sprints
- One marathon
- 02 — 13
Ivan Vuković
Partner, CEO
Do you need CTO as a service?
- 20+ years of experience
- 100+ successful projects
- 15+ happy clients
- 03 — 13
Filip Užarević
Senior UX Researcher
Power your product with user insights
- 10+ years of experience
- Qual and quant product research
- Proven impact on metrics
- 04 — 13
Marko Fuček
Senior Product Designer
Delightful experience with business objectives reached
- 8+ years of experience
- SaaS growth expertise
- Impact driven design
- 05 — 13
Vedran Blaženka
Senior Full Stack Engineer
Full stack with a designer's eye
- 10 years building web products, from startups to scale-ups
- Led product teams and mentored engineers
- Blends engineering with design thinking to ship valuable, impactful products
- 06 — 13
Jurica Martinez
Senior Full Stack Engineer
Clean code, measurable outcomes
- 8 years of experience
- 4+ years embedded at Kiwi.com
- Docs, decisions, delivery
- 07 — 13
Ivan Horvat
Senior Full Stack Engineer
End-to-end features, end-to-end ownership
- 4+ years of experience
- Mobile, web and backend
- Built a sailing app for the Adriatic
- 08 — 13
Tomislav Katalenić
Full Stack Engineer
Features cleared for takeoff
- 4 years of experience
- Led a company-wide frontend rollout
- On-call when it matters
- 09 — 13
Doris Lukman
Product Designer
Research-led product design
- 7+ years of experience
- 300+ user interviews
- Not just a personality hire
- 10 — 13
Marin Mašić
Senior Backend Developer
Backends that outlive trends
- 20+ years of experience
- Built a hospital system from scratch
- APIs serving millions of travelers
- 11 — 13
Hary Samardžić
Backend Developer
Solid systems, shipped fast
- 3 years of experience
- Observability from day one
- MVP backend specialist
- 12 — 13
Adrian Aničić
Software Developer
Production-ready UI, zero drama
- 3 years of experience
- Frontend with backend range
- Internal tools people actually use
- 13 — 13
Miro Čavar
Product Design Manager
From brand to product, and back
- 27 years of experience
- Leads retention design at Kiwi.com
- Co-founded a food magazine
We’re building a team designed for the next era of product development.
See open positionsCommunity powerhouse
Reactor isn’t just a venture studio. It’s part of a growing network of founders, operators, designers, and engineers shaping the next generation of products in the region.
UX Research Meetup
Group dedicated to the promotion of UX research and encouraging its development.
JavaScript Meetup
A monthly meetup of JavaScript developer enthusiasts from Zagreb and region.
Vibe Coders Croatia
A community for builders who ship. No gatekeeping, no corporate stiffness.
Host your next meetup in our space with support from our experienced organizer.
- 60 people capacity
- Access to mentors
- 3.5 hours availability
- Sponsorship for food and snacks
One idea.One sprint.One real product.
If it works, we scale it. If it doesn’t, we learn fast and move on. That’s the system.
Start an idea