Founder Fridays: Why vertical SaaS is the future with Justin Meretab, Layer & Atulya Pathak, Notion

Vertical SaaS is reshaping SMB finance: Layer Financial is building embedded accounting and bookkeeping for industry-specific software platforms, aiming to replace legacy tools like QuickBooks and Xero inside the workflows where small businesses already run their day-to-day operations. The core insight is that accounting is “mostly the same” across businesses, but the details—how revenue is collected, what expenses look like, and which workflows matter—vary sharply by industry. By tailoring accounting to those vertical nuances and integrating directly with platform revenue data, Layer targets the accuracy and usability gaps that show up when horizontal accounting software tries to ingest data through exports or imperfect integrations.

Justin Meretab’s path to Layer traces back to Square, where SMB customers repeatedly asked for a single place to handle accounting and bookkeeping alongside payment and banking tools. The recurring pain wasn’t just that accounting software was hard; it was that SMBs felt they weren’t getting value from legacy systems or from paying bookkeepers to manage messy processes. At the same time, the platforms serving those SMBs wanted to offer accounting but couldn’t justify building it internally because it requires deep domain expertise and additional complexity when bookkeeping services are included. That mismatch—clear demand from end customers plus heavy build complexity for platform companies—led to the “Stripe for accounting” model: a white-labeled, embedded product that platforms can integrate and launch without reinventing general ledger logic.

Layer’s growth story is anchored in early proof of demand. Before its seed, the company had already signed a first platform customer and built a pipeline of additional vertical SaaS partners, validating that platforms wanted embedded accounting and bookkeeping. After the pre-seed, the focus shifted to building a robust accounting platform capable of matching the functionality SMBs expect from QuickBooks, while enabling partner platforms to migrate customers off legacy tools. Meretab says the company has since helped SMBs move wholesale from other accounting systems into Layer through partners, with the experience simplified and tailored to each industry.

Funding reinforced that execution. Layer raised a $2.3 million seed round and later secured $6.6 million led by Emergence Capital. The pitch, per Meretab, centered on progress toward “QuickBooks-level” functionality plus evidence of demand across vertical SaaS categories—point-of-sale systems, neo-banks, invoicing tools, and other SMB platforms.

The capital is being deployed mainly into engineering: expanding core accounting features to support new industry workflows (inventory for retailers/e-commerce, project accounting for field services), and upgrading its bookkeeping service. Layer’s bookkeeping is described as AI-augmented and end-to-end, aiming to replace not only the software tool but also much of the work traditionally handled by bookkeepers.

AI plays a practical role in dealing with unstructured inputs—documents, loan paperwork, and transaction data—so the system can digitize, categorize, and unify financial activity into outputs like P&L. Meretab also credits embedded integration for performance gains: because Layer sits inside partner platforms that already see revenue events, it can reflect edge cases (like gift cards) more accurately than horizontal tools that rely on manual exports or brittle APIs.

Beyond product strategy, Meretab emphasizes founder fundamentals: build community with other founders (especially when coming from big tech and lacking a startup network), talk to customers as early as possible—even before a sellable product exists—and continually ask whether time is being spent “in the machine or on the machine,” creating cadences that protect long-term work from day-to-day reactivity.