From Developer Tool to Control Plane
Charles Birnbaum, partner at Bessemer Venture Partners, on the five waves of fintech
The real moat in fintech infrastructure is winning the handoff from startup simplicity to enterprise complexity. A vendor that can serve a new fintech in weeks, then still satisfy a scaled bank with custom controls, compliance workflows, and reliability, becomes hard to replace because it sits inside onboarding, fraud, issuing, or core banking decisions that directly affect revenue and risk.
-
Alloy is the clearest example of this pattern. The business crossed from useful tool to core system when it proved it could help fast growing fintechs onboard more users without more fraud, and also win a large bank customer in Ally Bank. That showed the product could handle both growth and bank grade controls.
-
Lithic shows the same split from another angle. Early teams use all in one BaaS products for speed, but as they scale they want direct bank relationships, custom KYC, custom card logic, and more control over money movement. That is where modular infrastructure vendors move from developer tool to mission critical layer.
-
This is why the comparison set includes Twilio and Marqeta. Bottom up developer adoption gets a vendor into the product early, but the big outcome comes when a few customers grow into large contracts and incumbents adopt the same stack for modernization instead of rebuilding old internal systems.
The next phase of fintech infrastructure will be won by companies that start as easy building blocks, then become the control plane for regulated workflows. As more banks, insurers, and vertical SaaS platforms rebuild around APIs, the biggest winners will be the vendors that can serve both the new entrant and the incumbent on the same underlying platform.