Top accelerator startups

Startups14,448Programs29

14,448 startups · 29 programs

e2e

Active · the software verification layer for the agentic coding era

WebsiteYC profile

Why it ranks

How the rank works
11signal of 100 · rising 11
  • team of 8Team size · YC's directory+4.9
  • went through YCProgram · this site+4
  • hiringHiring · Titles (titles.fru.dev), YC+2

A sum of public facts, not a judgement and not investment advice.

Competitors

AIOpslaneShared: catch bugs, review misses, code reviewYC S24San FranciscoStartup →AIInactiveCodeballShared: pull request, code review, bugsYC W21StockholmStartup →AINarrativeShared: bug report, agent handle, plain englishYC W23San FranciscoStartup →AIGreptileShared: pull request, code review, catchYC W24San FranciscoStartup →AIComposalShared: bugs before, test, flowYC F26LondonStartup →OtherCodeRabbitShared: pull request, code reviewStartup →OtherBazShared: code review, before, productionStartup →
Companies closest to e2e
Company
OpslaneShared: catch bugs, review misses, code reviewYC S24ActiveAI, Devtools
CodeballShared: pull request, code review, bugsYC W21InactiveAI, Devtools
NarrativeShared: bug report, agent handle, plain englishYC W23ActiveAI, Devtools
GreptileShared: pull request, code review, catchYC W24 +1ActiveAI, Devtools
ComposalShared: bugs before, test, flowYC F26ActiveAI, Devtools
CodeRabbitnot in a program hereShared: pull request, code reviewElsewhereOther
Baznot in a program hereShared: code review, before, productionElsewhereOther

Adjacent

AIRetroFixShared: plain english, describe, writeYC S24New York CityStartup →OtherCodacyShared: code review, monitorSeedcamp 2012Startup →AISparklesShared: github pull, pull request, describeYC W26LondonStartup →AIJanet AIShared: agent handle, plain english, describeYC S25San FranciscoStartup →Developer toolsCircleciShared: bugs before, test, code500 Global 2012United StatesStartup →
Companies next to e2e
Company
RetroFixShared: plain english, describe, writeYC S24ActiveAI, Devtools
CodacyShared: code review, monitorSeedcamp 2012Not statedOther
SparklesShared: github pull, pull request, describeYC W26ActiveAI, Devtools
Janet AIShared: agent handle, plain english, describeYC S25ActiveAI
CircleciShared: bugs before, test, code500 Global 2012Not statedDevtools

Also from X26 in AI

All of X26
AIAbInitio BioThe Intelligence layer for Drug ManufacturingYC X26BostonStartup →AIAdvanced Metal ResearchMachine intelligence for American WeldingYC X26Los AngelesStartup →AIAgentPhonePhone Numbers for AI AgentsYC X26San FranciscoStartup →AIAGI Deploy CoDiffusing AI into critical industriesYC X26San FranciscoStartup →AIAkkariAutonomous Customer OperationsYC X26San FranciscoStartup →AIAlchemizeBuilding AI Native Customs BrokeragesYC X26San FranciscoStartup →
Company
AbInitio BioThe Intelligence layer for Drug Manufacturingteam of 2ActiveAI
Advanced Metal ResearchMachine intelligence for American Weldingteam of 3ActiveAI
AgentPhonePhone Numbers for AI AgentshiringActiveAI
AGI Deploy CoDiffusing AI into critical industriesteam of 2ActiveAI
AkkariAutonomous Customer Operationsteam of 5ActiveAI
AlchemizeBuilding AI Native Customs Brokeragesteam of 2ActiveAI

Founders

  • Szymon RybczakFounder/CEO
  • Oskar KwaśniewskiFounder

About e2e

YC batch
X26 · Spring 2026
Status, per YC
Active
Category
AI, Developer tools
Team size
8
Location
Warsaw, Masovian Voivodeship, Poland; Remote
Founded
2026
Checked
6h ago

Changes seen

HiringNov 9, 2026

Started hiring.

Source ↗
NameNov 5, 2026

Renamed from TesterArmy.

Source ↗
WebsiteNov 5, 2026

Moved its website from tester.army to e2e.com.

Source ↗
Team sizeNov 5, 2026

Team went from 6 to 8 people.

Source ↗
Former namesNov 5, 2026

Former name added: TesterArmy.

Source ↗
Website linkNov 5, 2026

Website link changed from https://tester.army to https://e2e.com.

Source ↗
One-linerNov 5, 2026

Rewrote its one-liner; it read "Test your app with AI, catch bugs before users do"

Source ↗
HeadquartersSep 28, 2026

Moved its headquarters from San Francisco, CA, USA; Remote to Warsaw, Masovian Voivodeship, Poland; Remote.

Source ↗
RegionsSep 28, 2026

Now lists the region Poland and Europe; no longer lists United States of America and America / Canada.

Source ↗

e2e in X26: 194 companies, 84% AI

LinkedIn

e2e: questions

Which YC batch was e2e in?

e2e was in Y Combinator's Spring 2026 batch (X26).

Is e2e still active?

Y Combinator lists e2e as active.

Who founded e2e?

e2e's founders, as listed on its YC page: Szymon Rybczak (Founder/CEO), Oskar Kwaśniewski (Founder).

Where is e2e based?

e2e lists Warsaw, Masovian Voivodeship, Poland; Remote as its location on YC's directory.