Sixley came to TGA in its early, formative stages with no in-house technical capability of its own, and TGA acted as the business’s full virtual CTO, handling the platform’s technical design, build, support and maintenance end to end rather than simply augmenting an existing team. One of the central technical challenges was building a referral-tracking system robust enough to prevent spoofing, since the reward structure moves real money based on who’s credited with an introduction. The business pivoted partway through from targeting small and medium employers to an enterprise focus, the shift that eventually brought in clients like BT.