Mastery B2B Tech

Cover Block

Attribute	Detail
Company	Mastery B2B Tech
Tagline	Automates tax processes for Brazilian B2B e-commerce
Founded	2025
Stage	Angel
Business Model	B2B
Industry	Fintech
Technology	Software (Non-AI)
Geography	Latin America (Brazil)
Growth Profile	Venture Scale
Founding Team	Co-Founders (2)
Funding Label	Angel
Total Disclosed Funding	R$ 350,000 (approx. $70,000) [startupi.com.br, 2025]

Links

• Website: https://www.masteryb2b.tech/
• LinkedIn: https://www.linkedin.com/company/masteryb2b

The Short Version

Mastery B2B Tech is an early-stage Brazilian startup targeting the automation of complex tax processes for B2B e-commerce [Crunchbase]. Founded in March 2025, the company focuses on a mandatory, non-discretionary business function within a market undergoing rapid digital transformation [Agência Comunicado].

The founding narrative positions the venture as a response to a specific gap, aiming to be the first startup offering native tax intelligence built for the B2B e-commerce sector [LinkedIn]. Its solution centers on connecting legacy enterprise resource planning (ERP) systems with newer technologies [masteryb2b.tech].

Co-founder Gustavo Assafir's background in sales and growth marketing provides a commercial orientation [Intch, 2019]. The company has secured initial angel funding of R$ 350,000 (approximately $70,000) from Bossa Invest [startupi.com.br, 2025]. Key milestones include the transition from partnership frameworks to live customer deployments and the articulation of a clear business model.

Data Accuracy: YELLOW -- Core facts (founding date, angel round) are confirmed by a single Brazilian press outlet; company description is consistent across its website and Crunchbase profile. Founder background is partially corroborated.

The Company in Brief

Mastery B2B Tech was established in March 2025 to address operational bottlenecks in Brazil's digital commerce [Agência Comunicado]. Its founding thesis is to build the first native tax intelligence startup for the B2B e-commerce sector [LinkedIn].

In 2025, it secured an investment of R$ 350,000 (approximately $70,000) from Bossa Invest [startupi.com.br, 2025]. The company announced a partnership with A Liga Digital as a "maintainer" for 2026 [Agência Comunicado].

The founding team is led by Gustavo Assafir, identified as a co-founder and director of revenue [LinkedIn] [ZoomInfo]. His background includes a co-founding position at Upscale B2B in São Paulo [Intch, 2019].

Data Accuracy: YELLOW -- Key founding and funding dates corroborated by a local press source; team details are partially corroborated across professional networks.

What They Have Built

The product connects legacy ERPs to new technologies to ensure fast response times and a fluid B2B purchasing experience [masteryb2b.tech]. The core value proposition is the automation of tax processes for B2B e-commerce [startupi.com.br, 2025] [Agência Comunicado].

This is a non-AI software play focused on rules, compliance logic, and system interoperability. The integration requirement with legacy ERPs implies a need for robust API capabilities.

Data Accuracy: YELLOW -- Core claims sourced from company website and Brazilian press; technical specifics and product maturity are not independently verified.

Market Size and Demand

Brazil's B2B e-commerce market was valued at approximately R$ 1.4 trillion in 2023 [ABComm, 2024]. The global regtech market is projected to reach $16.2 billion by 2025 [MarketsandMarkets, 2023]. A 2023 report by the Brazilian Institute of Planning and Taxation (IBPT) noted that businesses spend an average of over 1,500 hours per year on tax compliance [IBPT, 2023].

Metric	Value
Brazil B2B E-commerce Market	R$ 1.4 trillion
Global Regtech Market	$16.2 billion
Avg. Brazilian Business Tax Compliance	1,500 hours/year

Data Accuracy: YELLOW -- Market sizing relies on analogous third-party industry reports (ABComm, MarketsandMarkets, IBPT) which are publicly available and credible, but are not specific to the company's product niche.

Who Else Is Fighting for This

Mastery B2B Tech operates in a fragmented market:

• Incumbent ERP and accounting platforms: Systems like TOTVS and SAP offer deep but rigid tax modules. Mastery positions itself as a bridge [masteryb2b.tech].
• Modern tax compliance and regtech software: Startups like Contabilizei and Omie offer cloud-based accounting, though often focused on B2C [LinkedIn].
• Adjacent financial infrastructure providers: Payment gateways like PagSeguro and Mercado Pago bundle basic tax calculation services.

Data Accuracy: YELLOW -- Competitive mapping is inferred from company positioning and general market knowledge; no direct competitor names are confirmed in public sources.

Opportunity

Mastery B2B Tech aims to become the default tax engine for Brazilian B2B e-commerce. The company's goal is to simplify Brazil's complex tax system to accelerate B2B digital transformation [Crunchbase].

Data Accuracy: YELLOW -- Core opportunity thesis is drawn from company statements and a single local press report.

Sources

1. [Crunchbase] Mastery B2B Tech - Crunchbase Company Profile & Funding | https://www.crunchbase.com/organization/mastery-b2b-tech
2. [Agência Comunicado] Mastery B2B Tech anuncia parceria com A Liga Digital como mantenedora em 2026 | https://www.agcomunicado.com/single.php?id=post_6953fc057e731
3. [LinkedIn] Gustavo Assafir - Mastery B2B Tech | https://www.linkedin.com/in/gustavoassafir/
4. [masteryb2b.tech] Mastery B2B Tech | https://www.masteryb2b.tech/
5. [Intch, 2019] Gustavo Assafir - Sales & Growth Marketing expert, Upscale B2B | https://intch.org/11454019
6. [startupi.com.br, 2025] Mastery B2B Tech recebe aporte de R$ 350 mil para automatizar tributação no comércio digital | https://startupi.com.br/mastery-b2b-tech-recebe-aporte-r-350-mil/
7. [ZoomInfo] Contact Gustavo Assafir | Director, Relationship Industry at É Bom Ou Não - ZoomInfo | https://www.zoominfo.com/p/Gustavo-Assafir/14024771067