John Harper

John Harper

Co-Founder and Chief Technology Officer

John is a 30+ year veteran of computer and telecommunications networking. Prior to Saisei, John led engineering at Anagran, overseeing the creation of their advanced flow-based traffic managers. He previously served at Cisco as the VP of IOS Routing, where he directed the strategy and development of routing protocols, multicast and IPv6 among other areas. John has also served in various senior development roles at Q3 Consulting and Digital Equipment. John is the author of more than 20 patents and holds a B.A. in Computer Studies from the University of Lancaster, England.

Larry Kestelman

Larry Kestelman


Larry is the founder and director of Oxygen Ventures, and a lead investor in Saisei. Larry brings with him an extraordinary wealth of knowledge and experience in business development. A serial entrepreneur, Larry is best known for founding Australian-based telecommunications and utilities provider, Dodo, which he exited for circa $250M in 2013. A seasoned property developer, Larry is currently constructing Melbourne’s largest residential and commercial development outside the CBD, Capitol Grand (a circa $500M development) as part of his LK Property Group. Larry’s other business ventures include Acquire BPO with over 7,000 employees in contact centers across Australia, the Philippines and the Dominican Republic, as well being owner of Australia’s National Basketball League and the Melbourne United Basketball Club.

Boris Rozenvasser

Boris Rozenvasser

Chief Executive Officer

Prior to joining Saisei as CEO, Boris held the role of Consumer Director at one of Australia’s leading telecommunications groups, M2 Group. As Consumer Director, Boris was responsible for a business unit of more than a half billion dollars with interests in telecommunications, energy and financial services. Overseeing a team of a few thousand employees, he was responsible for the business’ strategic development, overseeing the sales, marketing and operational functions of the business – delivering unprecedented numbers in subscriber growth. Boris holds a Bachelor of Laws and a Bachelor of Commerce specializing in accounting and finance. He has a strong background in leading product innovation and delivering on financial performance.

Julia Van Heerden

Julia van Heerden

Chief Operating Officer

Julia has held a number of senior and executive positions at global organizations spanning telecommunications to online wagering and gaming – including GM of Consumer Marketing of the M2 Group (ASX: MTU) in Australia, as well as Chief Operating Officer at International All Sports where she was instrumental in its sale to Paddy Power Plc’s Australian subsidiary, in 2009. A veteran of the online gaming industry, Julia headed up Retention Marketing for the Poker division at Osiris Trading (operators of the Fortune Lounge Online Gaming Group). Previously, Julia held positions as Account Director at Espial (one of South Africa’s foremost strategic design and implementation consultancies) and led the marketing strategy for Packard Bell NEC computers in South Africa. Julia holds an Honors degree in Information Technology from the University of Pretoria, South Africa.

Yossi Kahlon

Yossi Kahlon

Vice President of Sales

Yossi has over 15 years of telecommunications experience with a strong understanding of telecommunications infrastructure, with particular reference to large enterprises and ISPs. Prior to joining Saisei as VP of Sales, Yossi served as Regional Director ANZ of Audiocodes LTD (NSDQ:AUDC), where he headed up the ANZ business development team. Under his leadership, this region achieved record results. Yossi held position as Account Executive at Huawei Australia and led the strategic sales of the world next generation telecommunication network solutions in the Australia telecommunications market.

What people are saying

First Cagayan Converge Data Center “Fair usage was the biggest requirement for us, but FlowCommand has provided a number of other great benefits in terms of much more advanced and instantaneous visibility, analytics and control. The control of our bandwidth is markedly better across the board. We’ve improved bandwidth utilization by more than 30%, which has translated into a more than $80,000 bandwidth cost savings and delayed capex on upgrades for more than 6 months”

Edgardo Lopez, First Cagayan Converge Data Center, Inc. Chief Technology Officer

Sunway Information Technology “Saisei’s software has paid off in a number of ways. The two gaming operators who threatened to take their business elsewhere have decided to remain our customers. And we’ve been able to eliminate the 5-millisecond latency that can terminate a gaming session and its associated revenue.”

Daniel Soh, Assistant General Manager, Sunway Digital Wave

NHN Entertainment “Saisei’s software is critical for us. It’s helping us provide a high-quality gaming experience to our end users around the globe which is important to increasing customer loyalty and expanding our business. Saisei’s software is unique in its ability to do micro-flow level monitoring without packet capturing. It’s extremely easy to use. We looked at many of the top networking products but they were very costly and complex, and most were hardware based so we couldn’t utilize our unused servers in our data centers.”

Joohwan Kim, NHN Entertainment Infra Operation Team Leader

Fort Bend County Libraries “FlowCommand gives us great visibility and control, and also does an excellent job of augmenting the security on our network because we can see so much more. From the dashboard, we can now immediately see where traffic is coming from – and can really hone in on, for example, the top 25 applications being used and by which users, devices and locations – on a second-by-second basis. We’ve also gained a lot more control by using the software’s host equalization capability, which ensures every user has equal access to our local Wi-Fi networks and gets great applications performance, regardless of how many users are on the network or what applications they are running.”

Raymond Miranda, Network Specialist at Fort Bend County Libraries

network world testimonial “Saisei’s software suite brings order to chaos and makes the network a highly predictable system that can achieve utilisation rates over 95%.”

Zeus Kerravala, Founder and Principal Analyst, ZK Research

light reading testimonial “Using Saisei’s patented flow control technology, FlowCommand manages traffic without queueing, buffering, scheduling, or random packets drops.”

MITCH WAGNER, West Coast Bureau Chief, Light Reading

it world canada testimonial“Vendors that make competing network optimisation solutions like Cisco Systems, Riverbed and Silver Peak have been trying to do something similar but haven’t put the pieces together yet the way Saisei has.”

Howard Solomon, former editor of and Computing Canada

ema testimonial“The combination of deep visibility plus granular, automated, policy-based control has long been sought as the holy grail of network capacity and performance optimisation.”

Jim Frey, vice president of research, Enterprise Management Associates