About
William Fairbairn held the UK General Manager role at Agicap, a European CFO software platform, where he expanded the team significantly. He has prior experience as a consultant in McKinsey's technology practice and founded and exited a bootstrapped B2B SaaS business.
Founder, CEO at ZalosYC F25
Intro paths
YC
William went through Y Combinator (Fall 2025) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Tom Blomfield, Monzo and GoCardless co-founder; Y Combinator partner on leave and Anthropic compute-team member. — the partner who ran Zalos's batch and knows the company first-hand. YC profile ↗
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In turn, William can intro founders to Zalos's investors below.
Zalos's investors · 6
Co-founders at Zalos
HH
Hung HoangFounder, CTO
Experience
- Zalos (YC F25)Cofoundercurrent2025 — presentLondon
- AgicapUKI General Manager2023 — 2024
- McKinsey & CompanyEngagement Manager2019 — 2023London, United Kingdom
- KearneyAssociate2015 — 2019London, United Kingdom
- FabrikCo-Founder2016 — 2018Cambridge, England, United Kingdom
- HowCloudFounder2013 — 2014University of Warwick
- Warwick Finance SocietiesPresident2013 — 2014University of Warwick
- The Prince's TrustProgrammes & Development2014London
- Barclays Investment BankInvestment Banking2013London
Skills & more
Finance17Investment Banking27Economics33Mergers & Acquisitions13Data Analysis9Asset Management4Valuation6Microsoft Excel8Analysis21
From William's professional profile.
Frequently asked questions
- Who is William Fairbairn?
- William Fairbairn held the UK General Manager role at Agicap, a European CFO software platform, where he expanded the team significantly. He has prior experience as a consultant in McKinsey's technology practice and founded and exited a bootstrapped B2B SaaS business.
- Where does William Fairbairn work?
- William Fairbairn is Founder, CEO of Zalos.
- What companies did William Fairbairn found?
- William Fairbairn founded Zalos.
- Where did William Fairbairn go to school?
- William Fairbairn studied at University of Cambridge (Master of Philosophy (MPhil), Development Economics and Politics); University of Warwick (BSc Economics); King's College School Wimbledon.
Founder mafias
Y Combinator mafia8,773
Also came through, then founded or led a company.
Sam AltmanPresidentFounded Tools for Humanity +3Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianYC Summer 2005Founded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded Pursuit +1
+ 8,766 more
McKinsey & Company mafia337
Also came through, then founded or led a company.
Elad GilConsultantFounded Brain Co.Tony XuBusiness AnalystFounded DoorDashAlexandre ProtAssociateFounded Smartven +1Inaki BerenguerAssociateFounded InfiniteWatch +2Ryan XueManagement ConsultantFounded Andco +2Max AhrensFellow InternFounded Maihem +2
+ 330 more
University of Cambridge mafia256
Also came through, then founded or led a company.
Stewart ButterfieldMPhilFounded Flickr +1Demis HassabisBAFounded Google Deepmind +2Immad AkhundMaster of Arts (M.A.)Founded Clickpass +2Inaki BerenguerPhDFounded InfiniteWatch +2Harish AgarwalMaster of Philosophy - MPhilFounded Nori +2Nikola MrkšićDoctor of Philosophy (Ph.D.)Founded Poly +2
+ 249 more
University of Warwick mafia29
Also came through, then founded or led a company.
Tommaso TombaBachelor of Science - BSc Economics (First Class Hons.)Founded Moons +1Ross TaylorBachelor of Science (BSc)Founded Atlas Metrics +1Mark StokesClassicsFounded MAGDRIVE +1Tal BrownBScFounded Zone7 Human Performance Management PlatformErin James CollardMScFounded BlendMohamed Eisimat MohamedBachelor’s DegreeFounded Smart Bricks
+ 22 more
Same school
Also attended University of Cambridge893
Stewart ButterfieldCo-founder of Slack and FlickrDemis HassabisCo-founder & CEO of Google DeepMindNiko BonatsosVerdict Capital founder and pre-consensus investor formerly at General CatalystGeorgia StevensonInvestor at Index VenturesHannah SealInvestor at Index VenturesLeah von SiemensPartner at Manta Ray Ventures
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Also attended University of Warwick154
MariaInvestor at InvestinorChen Yang SiaGeneral Counsel at Golden Gate VenturesMichael CheungInvestment at Makers FundChen YangAdvisor at Golden Gate VenturesSvetlana BenderVice President, Artificial Intelligence & Behavioral Science at Flare Capital PartnersStephen ChambersGeneral Partner at SOSV
+ 148 more
Also attended King's College School Wimbledon18
Carolina MonckInvestor, PhD at Episode1David ‘DC’ CollierChief Technology Officer, RIKAI Labs at Orbit StartupsFreddie DodgeDirector at GP BullhoundMarcusGlobal Head of Regulatory Strategy at SENTINEL GLOBALLiam AhnPrincipal at Samsung VenturesWill BrooksFounder and Director at Portfolio Ventures
+ 12 more
Shared employers
Also worked at Zalos (YC F25)1
Also worked at Agicap4
Also worked at McKinsey & Company1,549
Elad GilSolo general partner investing through Gil CapitalJim BreyerFounder & CEO of Breyer CapitalAnn Miura-KoCo-founding Partner at FloodgateJeremy LiewPartner at Lightspeed Venture PartnersMike SpeiserManaging Director at Sutter Hill VenturesJeremy LevinePartner at Bessemer Venture Partners
+ 1,543 more
