Across many asset managers and asset owners, we routinely see firms that begin with similar talent, budgets, ambitions, and technology stacks arrive at materially different outcomes within two to three years. That gap shows up in the front office: how quickly firms launch new strategies, how consistently they service complex mandates across markets, and how much of their best judgment goes toward investment decisions rather than operational overhead. What separates them is rarely tooling decisions alone. It is whether decision making and execution capabilities form a coherent ecosystem or simply accumulate alongside each other, each with its own budget, vendor, and integration project. The firms that pull ahead treat both as a single system, not a stack of separate problems.

What we see consistently is that firms that move fastest are not looking to fix their platform. They are evaluating what the next version of their business requires. That is an architectural decision, and the firms that evaluate it early set the path and the pace the industry is following.

- Natalie McIntyre, Global Head of Consulting, Cutter Associates

For years, connectivity meant integration: pulling data into a platform of choice, encoding workflows, and stitching systems together. A defined engineering problem, solved once, then maintained. That definition held when the front office was less complex, when data lived in a handful of known systems and the decisions that mattered could be anticipated in advance. Those assumptions are built into platforms still in use, but that environment no longer exists. Larger private market allocations add operational complexity that legacy workflows were not designed to absorb. T+1 settlement, now moving from a US precedent toward regulatory expectations across Europe and APAC, imposes timing constraints on top of complexity. Firms building for T+1 today should be future proofing for the inevitable shift to T+0. Those that treat current settlement cycles as a ceiling will find themselves rebuilding infrastructure once again.

Every architectural decision your firm makes either compounds your advantage or adds to your technology debt. Which systems to buy or integrate matters less than what a foundation for compounding returns actually demands. The answer is a sequence of four structural decisions, and the order matters as much as the decisions themselves.

Foundational architecture rests on four decisions: unified data, coherent technology, standardized processes, and clear accountability. Most firms treat them as parallel investments of equal priority. That is how they spend heavily and arrive back where they started. Built in the right sequence, each expands what the next can do. Skipped or reordered, they generate cost without compounding.

Willis Towers Watson (WTW), a SimCorp client, is a global advisory and investment management firm with over USD 180 billion in assets under management. Over the past 15 years, WTW’s investment operating model has evolved, from predominantly investment advice to increasingly discretionary portfolio management. This was a shift that transferred full operational and fiduciary responsibility to the firm.

The tension and the architectural decision

When WTW moved into the OCIO model, the firm's ambition had begun to outpace its infrastructure. While the investment professionals were ready to manage portfolios on behalf of clients, the supporting systems had been built for an earlier stage of the business. Trade flows were largely manual, with no straight-through processing in place at the time and data was fragmented across different sources.

“We didn't always know where every piece of data was stored. People were using different datasets," says Paul Martin, Chief Investment Operating Officer at WTW.

WTW faced a stark choice: reinvest in what they had already built and extend it or look at alternatives in the market. “Ultimately, we decided that having a single provider in SimCorp was the right solution for us. It could service everything we needed - from the front office right through to client reporting.”

The decision consolidated 500,000 pieces of data onto a single platform, improving accessibility and consistency across the organization.

The multiplying effect

With a single data layer in place, the front office had a reliable foundation to act on. Standard workflows replaced the patchwork of local practices and made automation viable. Straight-through processing increased significantly, rising from zero to around 90 percent, freeing staff to focus on what they were hired to do: making investment decisions.

We've had some fantastic success and we've seen a lot of efficiencies," says Paul Martin. "And not just in one department but globally across portfolio management, investment operations and reporting – creating a truly global operating model.

- Paul Martin, Chief Investment Operating Officer, WTW

On that foundation, WTW grew the number of portfolios they manage by 35% and doubled the volume of reports produced across UK and Canadian clients alone.  For WTW’s investment teams, initially deploying in the UK and US, expanding into Australia, Canada, and continental Europe was achieved by configuration changes, rather than architectural change.

Architecture sets the boundaries of strategy before strategy is written. When WTW made its architectural decisions, the front office gained the capacity to pursue mandates and markets that had previously been out of reach. 

The question we ask firms is not what they want to build, but what their current foundation would prevent them from building. That answer tells us more about strategic trajectory than any roadmap document.

- Tim Luyet, Go-to-Market Senior Principal, SimCorp

Design architecture early and stop the rebuild cycle. Every move after that costs you less, builds faster, and widens the gap with firms that don't.