Meet the CIO | How Marijke Guest steered Nedbank through an IT crisis

Loading player...
When Nedbank realised early last year that its mammoth core banking overhaul and modernisation programme was going awry, it turned to Marijke Guest for help.
Guest, CIO of Nedbank Corporate and Investment Banking (CIB) and payments and a veteran of the financial services group, tells TechCentral’s Meet the CIO about how the bank realised it was headed for trouble, and what it took to get the project back on track and delivered – all in little under a year.
According to Nedbank, the project was thought to be 80% complete, but when it was reassessed in January 2024, it became clear that only around 20% of the actual scope had been delivered.
“Designs were incomplete,” the bank said. “Engineering practices were out of date. Key components, such as the liability rates engine, product lifecycle workflows and real-time processing, were either broken or unbuilt. The programme was years behind its intended outcomes, and the bank’s reputation was at stake.”
Guest, who has worked at Nedbank for the past 25 years, tells Meet the CIO’s Duncan McLeod about:
• When and why Nedbank first decided it needed to modernise its core banking systems and what the project would entail;
• What’s involved in an undertaking like this, and why there’s potential for things to go wrong that could lead to huge cost overruns – as has happened at other South African banks that have embarked on similar modernisation programmes;
• What Nedbank’s core banking modernisation project aimed to achieve, and why it was at risk of being derailed;
• What she did to get it back on track and motivate the IT teams involved;
• What it took to get everyone to start pulling in the same direction and ensure the project was delivered on time with zero reputational impact to the bank;
• How she coped with the immense pressure she and her teams were under from the board and top management to get the project done right, on time and within budget;
• What Nedbank can do now that it couldn’t do before, and how that positions it next to its rivals – both the traditional banks and the new digital bank challengers that have emerged in recent years; and
• What CIOs who are embarking on similarly complex IT projects can learn from Nedbank’s project – including the pitfalls they should watch out for, and what areas they should be careful not to neglect.
Guest was ultimately awarded Nedbank’s Chief Executive Award for her leadership of the project. No one involved in IT management should miss this fascinating discussion!
30 Jul 2025 English South Africa Technology · Business

Other recent episodes

TCS | Donovan Marsh on AI and the future of filmmaking

Award-winning South African film director Donovan Marsh has pivoted to artificial intelligence filmmaking and believes generative AI tools could fundamentally reshape how movies are made – and who gets to make them. Marsh, whose 30-year career includes directing the Hollywood submarine thriller Hunter Killer starring Gerard Butler and Gary Oldman,…
7 Apr 52 min

TCS+ | Vodacom Business moves to crack the SME tech gap

Everyone agrees that small and medium enterprises are the backbone of the South African economy. But the reality on the ground tells a different story – too many small businesses are still running on spreadsheets and WhatsApp, locked out of the tools that could help them compete. In this episode…
5 Apr 34 min

TCS | MTN’s Divyesh Joshi on the strategy behind Pi

MTN South Africa has launched Pi, a digital-only mobile operator that runs on MTN’s network but operates as a standalone brand, offering contract-free mobile and home 5G connectivity through a single app, with no call centres, no credit checks and no lock-in. In this episode of the TechCentral Show, TechCentral…
1 Apr 21 min

TCS | Anoosh Rooplal on the Post Office’s last stand

The South African Post Office has been in business rescue – a form of bankruptcy protection – since July 2023. Business rescue practitioners Anoosh Rooplal and Juanito Damons have made it clear to parliament that the entity will not survive liquidation unless a R3.8-billion bailout is received soon. With some…
27 Mar 27 min

Meet the CIO | Healthbridge CTO Anton Fatti on the future of digital health

Anton Fatti, chief technology officer of HealthBridge, says the doctor-patient relationship must remain at the centre of digital transformation in healthcare, even as AI reshapes how medical practices operate. Speaking on TechCentral’s Meet the CIO podcast series, brought to you by NTT DATA, Fatti said AI and cloud computing are…
23 Mar 45 min