Complex enterprise systems
I work on products where complexity is part of the domain, not noise to remove. My focus is on understanding the underlying system deeply enough to make it easier to navigate, operate, and evolve.
Ivan Siljic
Senior Product Designer
Complex Enterprise SaaS · UX Architecture · Evidence-Driven Product Design
I help product teams bring clarity and coherence to complex systems — especially in enterprise environments where legacy structures, specialized domains, and high-stakes workflows require careful design judgment.
Profile
Designing for complex product systems
I am a Senior Product Designer based in Vienna, focused on complex enterprise SaaS, UX architecture, system thinking, and evidence-driven product design.
Most recently at Flightkeys, I worked on mission-critical aviation software used in flight planning operations. My work included modernizing the UX of a 21-module product platform, establishing scalable UI foundations, and designing a pilot-facing EFB app for in-flight optimization.
I am strongest in large, ambiguous initiatives where product logic, domain expertise, technical constraints, and user needs have to be translated into a clearer product direction.
Design focus
Where my work creates leverage
UX architecture & navigation
I create structures that help complex products behave more coherently across modules: navigation models, information architecture, shared UI foundations, and patterns that can scale beyond a single feature.
Legacy modernization
I approach modernization as a structural design problem, not just a visual refresh. The goal is to improve coherence while preserving the operational knowledge and domain logic already embedded in the product.
Evidence-driven product design
I prefer design decisions that can be explained, tested, and improved. My work often combines research, stakeholder synthesis, prototype validation, domain feedback, and measurable product outcomes.
Technical collaboration
I work closely with engineering and bring enough technical fluency to discuss structure, feasibility, implementation trade-offs, and product constraints in depth. I care about design decisions that can survive real product constraints.
Selected work
Case studies available privately
Enterprise SaaS Platform Modernization
Restoring coherence across a 21-module mission-critical flight planning platform by turning fragmented sidebar and navigation patterns into shared product infrastructure.
What started as a visible navigation inconsistency became a broader product-structure initiative. The work focused on creating a shared model across modules without flattening the domain-specific logic of individual workflows.
Loretta EFB App
Designing a cockpit-ready decision-support app that helped pilots understand, trust, and use complex in-flight optimization.
The work involved cockpit research, observer flights, iterative prototype validation with pilots, and the translation of optimization logic into an interface designed for real flight conditions and fast operational judgment.
Selected case studies are available as private PDF or offline HTML review files on request, as they include confidential enterprise and aviation product work.
Experience
Product design across complex domains
Focused on UX modernization of a 21-module flight planning platform, scalable UI foundations, cross-module navigation structures, and a pilot-facing EFB app validated through cockpit research and iterative feedback.
Worked with founders and developers to conceive and launch a new data-driven luxury real estate platform as an extension of the company’s core business.
Designed interactive and gamified e-learning products, with conceptual responsibility for interaction design, user flows, and visual execution.
Role fit
Senior IC work in design-mature product organizations
My work is best suited to senior individual contributor roles in international SaaS or enterprise product organizations with mature product, design, and engineering practices.
The best match is an environment with complex product challenges, clear discovery and feedback loops, evidence-driven decision-making, and room to grow toward Staff or Principal-level impact through product work, systems thinking, and collaboration with strong peers.
Contact
Discuss a role or request selected case studies
To discuss a senior product design role or request selected case studies, get in touch.