About
Sean Bolton is co-founder and CEO of End Close. He previously spent six years at Modern Treasury as a payments engineering tech lead and later led the reconciliation organization, where he helped scale the platform to handle hundreds of billions in annual payments volume.
Founder at End CloseYC W26
Intro paths
YC
Sean went through Y Combinator (Winter 2026) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Brad Flora, Backing expeditions into the future — the partner who ran End Close's batch and knows the company first-hand. YC profile ↗
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In turn, Sean can intro founders to End Close's investors below.
End Close's investors · 1
Co-founders at End Close
DN
David NewellFounder
Experience
- End CloseCo-Founder and CEOcurrent2026 — presentSan Francisco Bay Area
- Modern TreasuryEngineering Manager2022 — 2025San Francisco, California, United States
- Modern TreasurySoftware Engineer2019 — 2022San Francisco, California, United States
- BricleirSoftware Engineer2018 — 2019Palo Alto
- GAAStrength.ie & Athletestrength.coCo-Founder & CTO2015 — 2018Ireland
- Teamwork.comMobile Development Intern2016 — 2017Cork, Ireland
- SummerJobs.ieFounder2014 — 2017Ireland
- Patrick Bourke MenswearSales Assistant2011 — 2015Kilrush , Clare, Ireland
- EricssonSoftware Development Intern2015Athlone, Ireland
- DivvyFounder2014 — 2015NUI Galway
- The PantryShop Assistant2013Kilkee, Clare, Ireland
Skills & more
Teamwork19Team Leadership6Entrepreneurship12Sales8Social Media9Research9Merchandising5Customer Service13Time Management6HerokuEnglish4Ruby on Rails
+12 more
Python (Programming Language)Vue.jsJavaScriptCSSLinuxRCAutoCADMatlabHTMLMicrosoft ExcelOS XLanguages English · French
- NUIG Excellence Scholarship — University of Galway
From Sean's professional profile.
Frequently asked questions
- Who is Sean Bolton?
- Sean Bolton is co-founder and CEO of End Close. He previously spent six years at Modern Treasury as a payments engineering tech lead and later led the reconciliation organization, where he helped scale the platform to handle hundreds of billions in annual payments volume.
- Where does Sean Bolton work?
- Sean Bolton is Founder of End Close.
- What companies did Sean Bolton found?
- Sean Bolton founded End Close.
- Where did Sean Bolton go to school?
- Sean Bolton studied at University of Notre Dame (Master of Science - MS, Entrepreneurship Science Technology Entrepreneurship Excellence Masters (ESTEEM)); University of Galway (BEng, Electronic & Computer Engineering); Kilrush Community School (Leaving Certificate 2013, Leaving Certificate).
Founder mafias
Y Combinator mafia8,773
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University of Notre Dame mafia28
Also came through, then founded or led a company.
Terrance BerlandBachelor of ScienceFounded Loadspring Solutions +1Jack O'MearaMaster’s DegreeFounded Aerska +1Jason SchoettlerBAFounded CalibrateRob Schoder, Jr.BAFounded Vinyl EquityMark YuskoBachelor of Science - BSFounded MorgancreekcapAdam HansmannBachelor of Arts (BA)Founded The Athletic
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University of Galway mafia9
Also came through, then founded or led a company.
Jack O'MearaBachelor's DegreeFounded Aerska +1David NewellBachelor of Engineering (BEng)Founded End Close +1Aimee DeGolyerFounded REPROSENTBarbara OliveiraDoctor of Philosophy - PhDFounded LuminateJames McWalterBachelor of Arts - BAFounded PacesAlison LiddyPostgraduate Diploma in InnovationFounded Relevium Medical
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Same school
Also attended University of Notre Dame317
Doug GrohAdvisor at CincyTechMimi DunnSenior Investment Analyst at Catalyst Health VenturesJim HuntGeneral Partner at Lavrock VenturesTristan HuntPartner at Averin CapitalJoanne IshamSenior Advisory Board at IronGate Capital AdvisorsAlex FlorAssociate at TCV
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Also attended University of Galway41
Katherine BoyleGeneral Partner at Andreessen Horowitz (American Dynamism)Kyle DuffyOperating Partner at Gradient who helps early-stage founders go from 0 to 1Alan O'ConnellPartner at Seroba Life SciencesJonathon KavanaghSenior Investment Portfolio Manager at Western Development CommissionEvan CannonAssociate at Osage Venture PartnersMarci MedfordInvestor at Innovius Capital
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Shared employers
Also worked at End Close2
Also worked at Modern Treasury7
Jenny JohnstonVenture Partner at Better Tomorrow VenturesLeslie CrowePartner at Bain Capital VenturesAni NarayanScout at Greylock PartnersAunkur AryaVenture Partner at Menlo VenturesMatt MarcusCo-Founder & CEO at Modern TreasuryAndy QinFounder at OpenTools
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Also worked at Teamwork.com2
Also worked at Ericsson100
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