Fundraising Fox

Arjun Bisen

Founder

Founder at Overwatch

Brooklyn, New York, United States

FoundedOverwatch · YC

About

Arjun Bisen worked as an Australian diplomat focused on geopolitical and cyber risk analysis across APAC before earning a Fulbright scholarship to study technology and risk at Harvard. He subsequently led risk teams at Stripe and Google Search, and founded Overwatch to address cyber, fraud, and financial crime risks.

LinkedIn ↗X / Twitter ↗
Latest on 𝕏

Arjun Bisen @arjunbisen1

At the same time, legacy problems like check fraud, especially in the U.S., aren’t going away, even as enforcement improves globally. The biggest risk isn’t flashy malware, but identity and trust being quietly abused at scale - see the top most targeted CVEs: https://t.co/3R5c4ecrzM

Dec 30, 2025 · ♥ 1

Arjun Bisen @arjunbisen1

2025 was about GenAI content. 2026 will be about AI agents. Browser and “computer use” agents can now mimic human behavior, run enumeration and card/account testing, mass-exploit CVEs and glitches, scale phishing, BEC, and impersonation with near-perfect language

Dec 30, 2025 · ♥ 1

Arjun Bisen @arjunbisen1

Fraud operations are shifting from the dark web to mainstream platforms like social media and ad ecosystems. The top mentioned tools from recent fraud tutorials include a number of social platforms. https://t.co/D8iH0I4gNp

Dec 30, 2025

Founder at OverwatchYC S22

Intro paths

YC

Arjun went through Y Combinator (Summer 2022) — any YC alum in your network can reach them through the YC community.

→

In turn, Arjun can intro founders to Overwatch's investors below.

Overwatch's investors · 5

New Era Capital PartnersPathlight VenturesPruVen Capital PartnersREFASHIOND VenturesY Combinator

Co-founders at Overwatch

ZPZara Perumal
Zara PerumalFounder

Experience

  1. OverwatchCEO and Cofoundercurrent2022 — presentBrooklyn, New York, United States
  2. Atlantic CouncilNon-Resident Fellow2021 — 2025
  3. StripeManager, Product Risk & Strategy2021 — 2022
  4. GoogleProduct Risk Policy Advisor2019 — 2021Sunnyvale, California
  5. Harvard Kennedy SchoolCourse Advisor to Secretary Ash Carter2018 — 2019Cambridge, Massachusetts
  6. Harvard Kennedy SchoolFulbright Scholar2017 — 2019
  7. Australian Department of Foreign Affairs and TradeAssistant Director2011 — 2019Canberra, Australian Capital Territory, Australia
  8. Australian Department of Foreign Affairs and TradeAustralian Diplomat (political, economic & aid)2013 — 2017Phnom Penh, Cambodia
  9. TwitterTrust, Strategy & Analytics - Summer Policy Analyst2018San Francisco Bay Area
  10. United NationsConsultant2010Bangkok, Bangkok City, Thailand
  11. Mckinsey & Co, University of Technology SydneyResearch Analyst2009Greater Sydney Area

Education

  1. Harvard Kennedy SchoolMaster of Public Policy2017 — 2019
  2. University of Technology SydneyBachelor of Business Administration - BBA, Honours in International Business

Skills & more

Diplomacy5Media Relations3Speech Writing3Asian Politics1Cyber Policy1Policy Analysis11Technology Policy2Agile Project Management1International Relations15Program ManagementData Analysis1Front-end Development1
+12 moreCyber-securityCyber DefenseDefense PolicyUser-centered DesignPolitical CommunicationPublic PolicyGovernmentInternational DevelopmentJavaScriptPythonRJIRA

From Arjun's professional profile.

Same school

Also attended Harvard Kennedy School181

Jeremy PhilipsInvestor at Spark CapitalMike MoradiGeneral Partner at Cortado VenturesGayatri SarkarFounder and CEO at Advaita CapitalSteve SargeantSenior Advisory Board at IronGate Capital AdvisorsRobert SiglerSenior Advisory Board at IronGate Capital AdvisorsJustin FreehVenture Partner at IronGate Capital Advisors

+ 175 more

Also attended University of Technology Sydney86

Garry VisontayPartner at Right Click CapitalMichelle SuttonFinancial Controller at Square Peg CapitalBree FedeleHead of Marketing & Communications at AirTree VenturesDave ParfettOperating Principal at AirTree VenturesKatie SeoFinance Manager at AirTree VenturesRaaj RayatPrincipal at AirTree Ventures

+ 80 more

Shared employers

Also worked at Overwatch5

Ziv ConenPartner at New Era Capital PartnersSelma BelghitiPrincipal at New Era Capital PartnersSudip ChakrabartiPartner at Andreessen HorowitzTala Al JabriPartner at HOF CapitalZara PerumalFounder at Overwatch

Also worked at Atlantic Council12

Alphaeus HansonLP Relations at Transform Capital ManagementArun IyerInvestor at Green FlagCarole N. HouseFormer White House National Security Council Special Advisor; Former Chair, CFTC Technology Advisory Committee at NEW VISTA CAPITALAnil MaguruPartner at SatganaB Pratyusha ChennupatiAtlantic Council Millennium Fellow; External Jury Reviewer, Food Waste Reduction Challenge; Member of the Canadian Agriculture Youth Council at The Yield Lab Asia PacificJustin MallenCEO at Silk Road Telecommunication at Chinaccelerator

+ 6 more

Also worked at Stripe111

Hemant TanejaCEO & Managing Director of General CatalystMatt HuangCo-founder and Managing Partner at ParadigmLuciana LixandruPartner at Sequoia CapitalLaura BuhlerPartner, Head of Community at Felicis VenturesJanet WolpertInvestor at Index VenturesMark FiorentinoInvestor at Index Ventures

+ 105 more

Also worked at Google1,132

Ron ConwayFounder of SV AngelBrian SingermanCo-founder of GPx; Partner Emeritus at Founders FundJess LeePartner and Chief Product Officer at Sequoia CapitalTomasz TunguzFounder & General Partner at Theory VenturesHunter WalkCo-founder & Partner at HomebrewAydin SenkutFounder & Managing Partner at Felicis

+ 1,126 more