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SideKit

YC W26

San Francisco, US · Founded 2025 · 2 employees · 2 known investors

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Approxima provides AI agents that handle routine software development tasks including scoping work, writing code, validating fixes in isolated environments, and deploying to production, freeing developers to focus on novel work.

Also known as SideKit, Inc. · Approxima · Sidekit · SideKit · Sidekit, SideKit

AI & Machine LearningDeveloper ToolsEnterprise SoftwareInfrastructureAICanadaAmerica / Canada

Founders & leadership· Y Combinator alumni (W26)

SideKit was founded in 2025 by Ethan Pronev and Ashish Selvaraj.

EPEthan Pronev
Ethan PronevFounderEthan Pronev worked on trading systems at Jane Street and Citadel Securities, and is a computer science graduate from the University of Waterloo. He is co-founder of Approxima.
ASAshish Selvaraj
Ashish SelvarajFounderAshish Selvaraj is co-founder at Approxima. He previously worked on delta live tables at Databricks and on infrastructure testing infrastructure at Microsoft, and holds a double degree in computer science and business from the University of Waterloo.

Investors · 2

Panakes PartnersreportedMilan

How we know: open dataset · 5k.vc investor directory · Not right? Tell us

Funding

SEC filings, press & company announcements

Source: company announcements and press reports — follow each round's link for the claim.

Related companies · 3

RaindropRaindrop provides observability and monitoring for AI agents, capturing traces of production runs including messages, tool calls, retries, and errors. The platform helps engineering teams detect silent failures, auto-fix issues, and integrate monitoring directly into Slack workflows.
ShapedShaped is a relevance engine that powers personalized content feeds, hybrid search, and AI agent memory retrieval for real-time personalization applications. It serves product teams, developers, and AI applications requiring behavioral-based recommendations and contextual retrieval.
EndstackEndstack is a cloud-based operating system that provides a persistent desktop environment accessible from any device, equipped with an integrated AI agent that can manage files, run commands, and use applications. It serves individual users and teams seeking an all-in-one workspace alternative to fragmented AI chat, coding, and collaboration tools.

Companies working in the same space as SideKit.

Legal entities · 1

corporate structure
SideKit, Inc.

Frequently asked questions

What does SideKit do?
Approxima provides AI agents that handle routine software development tasks including scoping work, writing code, validating fixes in isolated environments, and deploying to production, freeing developers to focus on novel work.
Who founded SideKit?
SideKit was founded by Ethan Pronev, Ashish Selvaraj in 2025.
Who are SideKit's investors?
SideKit's investors include Y Combinator, Panakes Partners.
Where is SideKit headquartered?
SideKit is headquartered in San Francisco, US.