Mediawerkt

What Mediawerkt does

Mediawerkt is a Netherlands-focused, founder-operated media consultancy founded by William Gilijamse around 2013 and legally structured as Gilijamse Solutions & Services SL, a private limited company incorporated in Spain (CIF B26788018). The firm provides end-to-end media services to Dutch SMEs, mid-market firms, and occasional enterprise clients — including media strategy development, campaign planning, media buying and negotiation, execution, and performance measurement via dashboards across TV, radio, outdoor/DOOH, print, and online channels. The value proposition centers on the founder's 11+ years of experience, including prior tenure at NPO/STER (Dutch public broadcaster's advertising arm), which provides insider knowledge of Dutch media systems and direct relationships with major media suppliers such as STER, Talpa/AdAlliance, Qmusic, Radio 538, Clearchannel, JCDecaux, Ocean Outdoor, and Google.

The business operates on two service tracks: a recurring monthly "Media Specialist" retainer for ongoing strategic and executional support (priced flexibly by client company size), and a project-based engagement model for ad-hoc campaigns billed on a variable-hour basis. Distribution is exclusively direct-to-client, with William personally managing sales, delivery, and supplier relationships; inbound leads are generated through a Dutch-language content marketing engine (blog, GetResponse newsletter, personal LinkedIn presence) and converted via a free advisory consultation. The customer base spans at least 50 named relationships across ten-plus verticals — including healthcare (Phonak-Lyric, MSD Animal Health, Hoorus, Sensoor), e-commerce (VidaXL, Bloomon, Waterluxe, Easy Toys), recruitment/staffing (Zorgwerk, Uitzendbureau 65+, Quoratio Groep, Linden-IT), culture (Drents Museum, Nationale Toneel), energy (Denim Solar), and radio/media (Qmusic, Radio 538, STER).

Technology usage is limited to industry-standard tooling — Avantedge (TV campaign planning), Radioprobe (radio analysis), GetResponse (email automation), and Typeform (contact capture) — with no proprietary platform, no AI/ML capabilities, no institutional funding, and no subsidiaries. Headcount is a single solo practitioner with occasional contract help, and the firm's scalability is fundamentally constrained by the founder's personal capacity. The firm is bootstrapped, privately held, GDPR-compliant, and operating with a Spanish corporate domicile while commercially focused on the Dutch market.

Name

Mediawerkt

Legal name

Gilijamse Solutions & Services SL

Website

https://mediawerkt.nl

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

1–10 employees

Short description

Mediawerkt is a Netherlands-focused, solo-practitioner media consultancy founded by William Gilijamse, delivering end-to-end media strategy, planning, buying, and execution across TV, radio, outdoor, print, and online channels to Dutch SMEs, mid-market firms, and select enterprises on retainer and project bases.

Ownership category

akta.pro rank

Product category

Media Buying & Planning Consultancy

NAICS

Media Buying Agencies (54183), Advertising, Public Relations, and Related Services (5418)

SIC

Services-Advertising Agencies (7311)

akta.pro industry

PRIMARYMPAAABAA

Full-Service Media Planning & Buying

Media, Entertainment & Sports/Advertising, Marketing & PR Services/Media Planning & Buying Agencies

SECONDARYBPAFAAAC

Media Planning, Buying & Optimization

Business & Public Services/Marketing, Advertising & PR Services/Full-Service Advertising Agencies

SECONDARYMPAAABAM

Media Auditing & Contract Compliance

Media, Entertainment & Sports/Advertising, Marketing & PR Services/Media Planning & Buying Agencies

Keywords

• Media buying services
• Media strategy consulting
• Advertising campaign planning
• Out-of-home media buying
• Media planning consultancy

Headquarters

HQ city

Utrecht

HQ country

Netherlands

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Monthly Retainer (Media Specialist): Clients pay a fixed monthly fee for ongoing media strategy, campaign planning, execution, and optimization. The fee varies by company size. This is the primary revenue stream and provides recurring, predictable income.
2. Project-Based Media Services: For ad-hoc or project-basis engagements (e.g., setting up a regional outdoor campaign, a single radio/print campaign, planning an online or TV campaign), clients pay per project/variable hours with no long-term commitment required.
3. Performance & Consulting Outcome: The company explicitly states that the monthly retainer 'pays for itself many times over,' implying implicit performance-based value. For the Phonak-Lyric case, they cite a 50% reduction in cost per lead and halving of the lead process steps — used as proof of ROI to justify fees.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

Mediawerkt is an independent media consultancy that plans, buys, and executes advertising campaigns for Dutch SMEs across TV, radio, outdoor/DOOH, online, social, and print channels. Its two core service models are a recurring monthly "Media Specialist" retainer (ongoing strategy, planning, execution, and optimization) and a project-based "Projectmatig" engagement (one-off campaign support without long-term commitment), delivered under a three-step Analysis-Strategy-Implementation methodology.

Product overview

Mediawerkt is a media consultancy operated by William Gilijamse as a freelancer. The company offers two core service models: (1) an ongoing Media Specialist retainer service providing dedicated media consulting for a fixed monthly fee, and (2) flexible project-based services billed per campaign. Services follow a three-step methodology: Analysis (customer behavior research, SWOT, online analysis), Strategy (media strategy development with clear objectives), and Implementation (campaign setup, execution, and evaluation via dashboards). The company specializes in TV, radio, outdoor (DOOH), online/social media advertising, and print campaigns.

Differentiator

Problem solved

Functional benefit

Products and services

• Media Specialist Service Ongoing media consulting retainer in which Mediawerkt provides a dedicated experienced media specialist to develop and execute a complete media strategy for the client on a fixed monthly fee that scales with company size. Covers analysis, media strategy, plan execution, dashboard reporting, and continuous optimization across TV, radio, outdoor, online, social, and print channels. Intended for Dutch SME business managers and entrepreneurs that need a long-term outsourced media department.
• Project-Based Media Services Flexible project-based media consulting and buying service for specific campaigns or ad-hoc needs, including outdoor, radio/print, social media/Google, and TV campaign support. Billed only when campaigns are deployed with variable hours and no long-term commitment required. Designed for businesses that need media expertise for a single launch, regional expansion, or seasonal campaign.

Quantifiable outcome

• Brand awareness increased by 35% (Youbahn case, vs. 30% target) after integrated TV/radio/outdoor/print/online campaign
• +4 more outcomes

Named customers29 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

Partnerships

Eleven partnerships are on record, tiered minor and core.

• KesselsKramerminorStrategic or Co-development Partner · 27 October 2020Independent Dutch advertising agency. Mediawerkt acted as media consultant on TV advertising projects brokered through KesselsKramer for clients Stichting Deltaplan Biodiversiteitsherstel and Omroep Groen.
• ClearchannelcoreOthersOne of the primary outdoor/DOOH media operators Mediawerkt maintains active relationships with for media buying and campaign planning. Clearchannel is cited as a regular meeting partner for keeping up with the latest outdoor advertising developments.
• JCDecauxcoreOthersLeading outdoor advertising company operating billboards, transit advertising, and urban furniture (including airports and public transport). Cited as a key outdoor media supplier and meeting partner.
• QmusiccoreGTM or Marketing PartnerDutch national radio station with strong listener engagement. Mediawerkt buys airtime on Qmusic for client campaigns and maintains an active commercial partnership. Qmusic is cited as exemplary for its customer-centric culture, which Mediawerkt recommends emulating.
• HillenaarcoreOthersDutch outdoor advertising specialist. Listed as a key media supplier and a company with whom William holds regular meetings to discuss campaign opportunities and industry developments.
• Talpa / STER / AdAlliancecoreOthersTalpa is a Dutch media company; STER (Stichting Ether Reclame) is the advertising agency for Dutch public broadcasters. AdAlliance is a media sales organization. These are key TV and radio media suppliers. William maintains regular meetings with representatives from these groups.
• Ocean OutdoorcoreOthersDigital out-of-home media operator with premium digital billboard inventory across the Netherlands. Listed as a key media supplier and meeting partner for DOOH campaign execution.
• NPO/STERcoreOthersThe public broadcasting system's advertising arm. William previously worked at NPO/STER for several years, which gave him deep knowledge of the TV and radio advertising systems. He now uses these relationships as a supplier network for client campaigns.
• RTLcoreOthersMajor Dutch commercial TV broadcaster. Listed as a key media supplier alongside STER and Clearchannel in a 2017 job posting. Regular meetings held for TV campaign planning and buying.
• VolkskrantminorOthersDutch national newspaper (De Volkskrant). Listed as a key media supplier alongside other outlets for print and possibly digital advertising.
• InterbestminorOthersDutch regional media sales house representing local and regional broadcasters. Listed as a media supplier partner for regional campaign coverage.

Scale indicators6 records

Recent moves6 records

Expansion highlights3 records

Broad incumbents

• Publicis Groupe Netherlands: Global advertising holding company's Dutch operations (including Starcom, Zenith, Spark Foundry for media). Provides media planning, buying, and integrated campaign services to Dutch advertisers at scale, including advanced data and programmatic capabilities that compete directly with Mediawerkt's value proposition.
• Initiative Netherlands: IPG Mediabrands' global media agency, with Dutch operations providing media strategy, planning, buying, and analytics. Direct competitor in the Dutch media agency market, with network-level data partnerships, programmatic scale, and measurement capabilities beyond Mediawerkt's solo-practitioner setup.
• Carat Netherlands: Dentsu's global media agency brand, operating in the Netherlands with a full media planning, buying, and digital offering. Direct overlap with Mediawerkt's core services but with network-scale data, technology, and cross-channel execution capabilities.
• Dentsu Creative Netherlands: Global advertising network's Dutch operations providing full-service creative, media, and digital services. Comparable in offering integrated media and campaign services to Dutch clients, but with a much larger team, proprietary technology platforms, and cross-border execution capabilities.
• GroupM Netherlands: Largest media investment group in the Netherlands (parent WPP), operating Mindshare, Wavemaker, EssenceMediacom, and GroupM Nexus. Direct overlap with Mediawerkt's media planning and buying services, but at vastly greater scale, with full programmatic, analytics, and international coordination capabilities that Mediawerkt cannot match.
• OMD Netherlands: Omnicom Media Group's flagship media agency in the Netherlands. Direct competitor in media planning and buying for Dutch advertisers, with the scale advantages of a global network (advanced programmatic tools, data partnerships, international reach) that Mediawerkt as a solo practitioner cannot replicate.

Regional players

• Adresult: Independent Dutch digital marketing and media agency. Comparable as a mid-sized Dutch firm offering media buying, programmatic, and digital campaign services to SME and mid-market clients, with similar target customer profile to Mediawerkt's Dutch SME/MKB segment.
• FHV BBDO: Major Dutch advertising agency and BBDO network affiliate, headquartered in Amsterdam. Comparable as a Dutch integrated marketing and media services firm, with a stronger creative focus but overlapping media planning and buying capabilities for Dutch advertisers.
• ZIGT: Independent Dutch media agency headquartered in Deventer. Provides media strategy, planning, buying, and campaign optimization to Dutch advertisers. Closest scale-comparable to Mediawerkt as another independent Dutch media specialist, though ZIGT operates with a larger team and broader service portfolio.
• KesselsKramer: Leading independent Dutch creative agency, based in Amsterdam. Already a working partner of Mediawerkt (Mediawerkt acts as media consultant for KesselsKramer's clients). Comparable as a fellow Dutch independent marketing/communications firm with similar cultural positioning, though KesselsKramer focuses on creative work while Mediawerkt focuses on media planning/buying.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Mediawerkt