Brazil's B2B e-commerce market is growing. Its tax system is not. The country's labyrinthine compliance rules remain a notorious friction point for digital trade [Crunchbase]. Mastery B2B Tech, a São Paulo-based startup founded in March 2025, is placing its first chips on automating that complexity away.
Its initial product pitch is straightforward: connect legacy enterprise resource planning (ERP) systems to modern commerce platforms, then handle the tax calculations and filings in between. The goal is to make B2B transactions as fluid as consumer purchases.
The Brazilian Compliance Wedge
The company's early focus is a calculated bet on market timing. By tackling tax first, Mastery B2B Tech aims to be the pipe that enables faster invoice processing, automated reconciliation, and smoother procurement workflows.
Founder Gustavo Assafir brings a sales and growth marketing background from prior roles, including a stint at Upscale B2B [Intch, 2019]. The first challenge is not building a better algorithm, but convincing mid-market Brazilian companies that a new vendor can reliably navigate the tax authority's rules.
Funding and the Path Forward
The startup's first external validation comes from Bossa Invest, which led an angel round reported at 350,000 reais (approximately $70,000) in 2025 [startupi.com.br, 2025]. The round is small, suggesting a proof-of-concept stage.
Mastery B2B Tech's differentiation hinges on a dedicated focus on the B2B e-commerce workflow. Its success will depend on executing a few key integrations flawlessly and demonstrating clear time-to-value for its first clients.
For a company this early, the next 12 months are about moving from slideware to provable metrics. The 350,000 reais from Bossa Invest is a starting gun, not a finish line.