We map the problem space before writing a single line of code.
Through structured analysis and stakeholder dialogue, we identify architectural requirements, system constraints, and strategic priorities that define the engagement scope.
Infrastructure andIntelligence Consultancy
We design and deploy high-performance digital systems for organizations operating at the edge of technical complexity.
Trusted By
What We Do
We architect, build, and operate complex digital systems that deliver lasting performance.
Architecture
Integration
Infrastructure
Intelligence
Infrastructure Architecture
We build scalable, secure, and high-performance backend systems and digital foundations engineered for complex products and demanding operational environments.
Intelligent Systems
We implement data-driven, autonomous, and adaptive systems that improve decision-making and operational performance across every layer of your platform.
Strategic Advisory
We guide founders and organizations in structuring, launching, and scaling technically complex platforms with clarity, precision, and long-term viability.
Our Philosophy
Durable systems require both robust architecture and adaptive logic.
We design infrastructure built to scale and intelligence built to evolve. Every system we deliver is engineered for the conditions of today and the demands of tomorrow.
Our Process
The Method Behind Every Engagement
We design systems with durability, performance, and adaptability at their core.
Every technical decision is evaluated against long-term operational requirements. We produce detailed system blueprints that account for scale, security, and integration complexity.
Our engineering team delivers production-grade systems with precision.
We transform architectural plans into robust, tested infrastructure. Every component is built to withstand real-world conditions and integrate cleanly with existing systems.
We optimize, monitor, and evolve systems as requirements grow.
Post-deployment, we refine performance, extend capabilities, and ensure each system continues to meet the demands of a changing operational environment.
Leadership
Engineering Leadership With Operational Depth
Fusion3 is led by engineers with direct experience building and operating infrastructure at protocol level. Our leadership combines deep technical capability with structured operational discipline.
CEO & Engineering Lead
Sergej Sakac
Sergej is the founder of the RegionX project and a member of the Polkadot Fellowship. He has been a core contributor to Substrate and Polkadot for over three years, with deep expertise in distributed systems and protocol-level infrastructure. He is an engineering alumnus of the Polkadot Blockchain Academy at UC Berkeley.
COO
Sergej N. Sakac
Sergej N. Sakac is an engineer with a master's degree and over 20 years of experience in organizational leadership across IT and engineering industries. He oversees operational strategy, delivery execution, and the structural integrity of every engagement.
Engineer
Petar Grahovac
Petar is an engineer who has worked on RegionX, contributing to the development of a production-grade Web3 application frontend. He focuses on building reliable frontend systems with an emphasis on seamless user experiences.