About Us

For more than 20 years, we have lived up to our reputation for being a “Centre of Envisioning Excellence” – or “Ceenex” – in our fields of expertise. Our Infrastructure and Business Engineering Disciplines are at the cutting-edge of technology and innovation, enabling us to engineer unique technical solutions to solve our clients’ challenges.

Enshrined in our Vision Statement, this focus on innovation guides everything that we do and is driven by our core values, which include:

Shared value
Integrity and fair dealings

Our unwavering commitment to these core values is evidenced by the immense pride that we take in our profession and specifically the role that we are playing in its growth and sustainability. Through our high commitment and collaboration, we provide professional technical services to our many public- and private-sector clients. And, in helping them solve problems, Ceenex is always sincere and practices integrity and fair dealings.

These traits have remained a strategic thrust behind our rapid growth over the years. Yet, we remain driven to enhance, hone and refine this competitive edge. This while also advancing the economic and social circumstances in communities that reside within our operational footprint.


Sarel Holtzhausen


Kgomotso Sekgobela


Imre Viljoen

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Sarel Holtzhausen

Designation: Director
Experience: 20 years
Qualifications: B Eng (Civil) B Eng Hons (Water Resource Engineering), University of Pretoria
Professional affiliations: ECSA, SAICE, WISA, IMESA

Sarel Holtzhausen has been working in the municipal infrastructure and mainly the water sector since the start of his career in 2003. Initially, Holtzhausen worked as a civil designer on water projects, ranging from water treatment plants; pump stations; and reticulation systems. This was followed by a career as a water planning consultant and process designer for water supply systems and wastewater treatment (WWT) plants. Over the years, he has successfully participated in many infrastructure projects within the following key disciplines:

  • Residential, commercial and industrial developments
  • Grant-funded municipal infrastructure projects
  • Potable water treatment
  • Industrial and domestic WWT and re-use
  • Existing treatment facilities, optimisation and process audits
  • Refurbishment of municipal water and sanitation infrastructure
  • Pipeline and pumped systems
  • Feasibility and funding applications for infrastructure projects
  • Mining infrastructure

Holtzhausen started his career with Africon Engineering International. In 2004, he joined LHL Consulting Engineers, which later became Sizatech Consulting Engineers. In 2008, Holtzhausen became a shareholder and Director of Sizatech Consulting Engineers which, in 2014, merged with Ceenex. Holtzhausen is currently serving as an Executive Director of Ceenex and heads the Business Engineering Unit.

Kgomotso Sekgobela

Designation: Director
Experience: 15 years
Qualifications: Post Graduate Diploma in Development Finance (University of Cape Town Graduate School of Business); Bachelor of Commerce in Entrepreneurship (Mancosa); National N Diploma in Electrical Engineering (Central Johannesburg College); and Global Development Programme (University of Pretoria’s Business School – GIBS) 

Kgomotso Sekgobela has collective experience in entrepreneurship; project and construction management; marketing; and new and existing business development. Sekgobela is also skilled in key project identification, negotiation and execution. This is in addition to determining and formulating relevant policies and providing overall direction for companies and projects. Moreover, he is well versed in developing strategic plans to advance companies’ missions and objectives and promote revenue, profitability and growth. Sekgobela is also an expert in directing companies’ operations to ensure production efficiency, quality, service, and cost-effective management of resources.

In 2018, Sekgobela was appointed Executive Director of Ceenex and heads the Business Development Business Unit. 

Imre Viljoen

Designation: Director
Experience: 29 years
Qualifications: B Eng (Industrial) cum laude, University of Pretoria
Professional affiliations: Member of Southern African Institute for Industrial Engineering (MSAIIE).

Imre Viljoen has many years of experience in the Engineering and Information Technology field. Viljoen is an expert in:

  • Business and process simulation, modelling and optimisation
  • Information technology architecture and systems design and support
  • Supply-chain modelling, scheduling and optimisation
  • Using simulation for real-time process control and automation
  • Digital twin deployment
  • Business process design
  • Financial process design and optimisation
  • Financial management and support
  • Management information system design and support
  • Decision support systems development
  • Web-based information systems
  • Transport scheduling systems
  • Customer-relationship management

Viljoen has extensive experience solving complex process and systems problems; undertaking modelling, simulation and system development for the mining, transport, logistics and water sectors; applying theory of constraints in mining; CIO; and implementing enterprise-resource planning and customer care systems in the water sector. This is in addition to strategic and institutional design; water resources systems implementation; information technology systems design; auditing and analysis of business and infrastructure; and business processes and systems design.

He joined Ceenex in December 2000 and, in 2008, was appointed an Executive Director of Ceenex. Viljoen heads the Business Engineering Unit.