What BrainDonors does

BrainDonors is a private, full-service B2B digital marketing agency operating under Ad Tech International LLC. Founded in 2024 and headquartered in Sofia, Bulgaria, with a second office in Amsterdam, Netherlands, the agency delivers strategy, media buying, content and SEO, and technical implementation services — including HubSpot CRM deployment and web design/development — to B2B clients. The company claims 1,200+ clients worldwide and 300+ completed projects, with named engagements spanning B2B SaaS, manufacturing, healthcare, finance, automotive, and retail (e.g., OraSure Technologies, Nissha Europe, CatalystPay, DualityTech, Levi's, Wörwag Pharma).

The agency is organized around four service pillars: Strategy (global expansion and market entry), Media & Delivery (LinkedIn, Google, Meta, YouTube, Twitter, and programmatic ads), Content & SEO, and Technical services. Its core technology is non-proprietary: the team leverages third-party platforms including HubSpot, Google Analytics, The Trade Desk, and Meta advertising tools, supported by certifications as a HubSpot Platinum Partner, Google Partner, and Meta Business Partner. Go-to-market is sales-led and consultative, targeting enterprise and mid-market B2B companies across Central/Eastern Europe, Western Europe, and the broader EMEA region, with multi-year retainers and project-based engagements priced per scope.

Revenue is generated through professional services fees (retainers, project work, and ongoing account management), with custom project-based pricing. The team comprises 50+ members across 12 internal teams, led by Marketing Director & Co-Founder Andrey Petrov (HubSpot Certified Trainer and Meta Certified Lead Trainer with 12+ years of consulting experience) and Content & Copywriting Team Lead Dilyana Sergieva. The firm is privately held with no disclosed external funding, no parent company, and no subsidiaries, and co-organizes the B2B Growth Conf 2026 with HubSpot at Sofia Tech Park as a market-positioning initiative.

Name

BrainDonors

Legal name

Ad Tech International LLC

Website

https://braindonors.agency

Company type

Private

Founded year

2024

Operating status

Operating

Headcount range

11–50 employees

Short description

BrainDonors is a private, full-service B2B digital marketing agency operating from Sofia, Bulgaria and Amsterdam, Netherlands. It delivers strategy, paid media, content and SEO, and HubSpot implementation services to enterprise and mid-market B2B clients across CEE, Western Europe, and EMEA.

Ownership category

akta.pro rank

Product category

Digital Marketing Services

akta.pro primary industry

B2B Demand Generation & Lead Nurture Agencies (BPAFAKAA)

akta.pro secondary industry

Appointment Setting & Sales Development (SDR/BDR) Services (BPAFAKAD)

Keywords

• B2B digital marketing
• Demand generation services
• Inbound marketing agency
• HubSpot implementation services
• Paid media advertising

Headquarters

HQ city

Amsterdam

HQ country

Netherlands

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Marketing or Sales, Operations, Technology or R&D, Infrastructure, Others

Revenue model

1. Digital Marketing Services: Full-service B2B digital marketing agency providing strategy, media buying, content/SEO, and technical services (HubSpot implementation, web design/development). Revenue generated through project-based work, retainers, and ongoing service contracts tailored to client needs.

Pricing tiers

Go-to-market motion3 records

Distribution channels3 records

Marketing channels10 records

Core offering

BrainDonors is a full-service B2B digital marketing agency delivering demand generation, inbound marketing, and growth marketing services. Offerings span strategy consulting, paid media buying (LinkedIn, Google, Facebook, Twitter, YouTube, programmatic), content and SEO, HubSpot implementation, and conversion-focused web design and development, all delivered by an in-house certified team for enterprise and mid-market B2B clients.

Product overview

BrainDonors is a B2B digital marketing agency, not a software product company. The agency offers a portfolio of interconnected marketing services organized around four pillars: Strategy (global expansion, market entry, international strategy), Media & Delivery (LinkedIn Ads, Google Ads, Facebook Ads, Twitter Ads, YouTube Ads, Programmatic Ads), Content & SEO (content marketing, email marketing, copywriting, SEO), and Technical services (HubSpot implementation, web design, web development). The agency specializes in B2B demand generation, inbound marketing, and growth marketing, positioning these as distinct service lines. Services are delivered by a certified team and supported by partnerships with HubSpot, Google, Meta, and The Trade Desk. The agency operates from offices in Sofia, Bulgaria and Amsterdam, Netherlands, and has served 1,200+ clients worldwide.

Differentiator

Problem solved

Functional benefit

Brands

• B2B Demand Generation Agency: B2B demand generation services focused on generating qualified leads and supporting pipeline growth
• B2B Inbound Agency
• B2B Growth Marketing Agency

Products and services

• B2B Digital Marketing Services Full-service B2B digital marketing agency offering strategy, media buying, content creation, SEO, and technical services including HubSpot implementation and web development for B2B companies.
• B2B Demand Generation Services Demand generation services focused on creating consistent, high-quality B2B leads through intent signal identification, account targeting, and pipeline-ready lead generation.
• B2B Inbound Marketing Services Inbound marketing services helping B2B companies attract, engage, and convert buyers through SEO, content marketing, and lead nurturing across the buyer journey.
• B2B Growth Marketing Services Data-driven full-funnel growth marketing services combining strategy, demand generation, conversion optimization, and multi-channel execution for scalable B2B revenue growth.
• HubSpot Services HubSpot CRM implementation, optimization, and automation services including marketing automation, lead tracking, pipeline management, and sales alignment.
• Web Design & Development Services Conversion-focused web design and development services including responsive design, CMS implementation, and landing page optimization for B2B lead generation.

Quantifiable outcome

• 160% engagement increase for OraSure Technologies
• +9 more outcomes

Named customers19 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• HubSpotcoreGTM or Marketing Partner · 8 May 2026Co-organizing B2B Growth Conf 2026 with HubSpot on May 8 at Sofia Tech Park in Bulgaria. The conference brings together 500+ practitioners, founders, and investors to address B2B revenue growth in Central and Eastern Europe. BrainDonors CEO Andrey Petrov highlighted the need for increased productivity as cost advantages narrow in the region.

Scale indicators6 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• SmartBug Media: Full-service B2B inbound marketing agency and one of the original HubSpot Elite partners. Directly comparable in service mix (inbound, demand gen, HubSpot implementation), B2B SaaS focus, and enterprise client roster.
• Velocity Partners: B2B technology marketing agency specializing in demand generation, content, and account-based marketing for tech vendors. Directly comparable in B2B tech focus and full-funnel demand-gen delivery model.
• Salted Stone: HubSpot Elite Partner agency offering inbound marketing, web design, and revenue operations services. Closely comparable in HubSpot partnership tier, full-stack B2B services, and mid-market/enterprise customer mix.
• Single Grain: B2B SaaS digital marketing agency offering SEO, paid media, and demand generation services. Comparable target customer (B2B SaaS and tech), service pillars, and emphasis on measurable pipeline outcomes.
• Ironpaper: B2B demand generation and inbound marketing agency focused on industrial, manufacturing, and tech clients. Comparable in vertical emphasis (B2B, manufacturing/OEM), HubSpot alignment, and lead-to-revenue outcomes orientation.
• DemandZen: B2B demand generation agency focused on lead nurturing, content syndication, and appointment setting for tech and SaaS firms. Comparable in B2B demand-gen core service and pipeline-outcome value proposition.
• CIENCE: B2B demand generation and outbound sales agency providing SDR, lead generation, and content services to tech and SaaS clients. Comparable in B2B SaaS target market and demand-gen / pipeline focus.

Broad incumbents

• Rock Content: Larger content marketing and digital services platform with a B2B SaaS focus and global delivery. Comparable in content/SEO service pillar but broader in scale, geography, and productized offerings (e.g., marketplace, managed services).
• WebFX: Large full-service digital marketing agency with proprietary tech (MarketingCloudFX) and broad B2B client base. Comparable in full-service positioning but materially larger and productized through proprietary technology.
• KlientBoost: Mid-to-large performance marketing agency specializing in PPC, CRO, and paid media for SaaS and B2B. Comparable in paid-media service pillar and B2B SaaS customer segment, though more concentrated on performance/paid channels.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about BrainDonors