Engineering, Product and Design Startups funded by Y Combinator (YC) in New York 2026

F2 is the AI platform for private markets investors. Purpose-built for private credit, private equity, and commercial banking, F2 accelerates diligence, underwriting, and portfolio monitoring, helping teams evaluate deals over 60% faster. F2 turns unstructured deal data into investment-grade analysis and polished memos in minutes. Unlike general-purpose AI, F2 is built with the domain expertise and depth to handle the most complex financial analysis. Already trusted across thousands of deals, F2 makes collaboration easy and retains historical context, so past work compounds into future wins. Headquartered in New York City, F2 is backed by leading investors including NFX, Left Lane Capital, and Y Combinator.

The greatest product teams use Interfere to spend more time building what’s next instead of maintaining what was.

Dolphin is a startup in a box. Dolphin is a web-app builder for aspiring startup founders to ship to their first customers in an hour. Dolphin builds startups in one pass. Dolphin can setup subscriptions, AI assistants, complicated database updates, integrations, messaging, and more. Teddy and I have spent thousands of hours building complicated web apps, and we’ve developed strong opinions on how to architect them. That’s why Dolphin is so powerful: rather than give an AI free rein, we constrain it to the Dolphin architecture. Constraints breed creativity. We designed the Dolphin architecture so that, when an AI works with it, its outputs are correct, secure, and scalable.

What Corsair is: Corsair gives you (or your agent) safe access to hundreds of integrations. It natively handles all integration plumbing. The only code you write is the code that's specific to your use case. Your data stays yours. Why we wrote it: Integrations make products capable. Integrations are also frustrating to write. If you look at any codebase with integrations, 95% of the code is identical. It's all just basic plumbing. The part of the integration that is unique to a codebase and actually adds value is probably just a few lines. We shouldn't waste time writing and maintaining the 95% for a few lines. The developer community has just accepted that we do. Corsair handles the 95% so you don't have to. It's really hard to get wrong.

Diode automates circuit board design. We work with hardware companies to get them the PCBs they need, fast.

Haystack helps you review and merge code faster, without sacrificing quality. Haystack is a code review platform that breaks down pull requests into digestible chunks and lays them out on an infinite canvas, replacing traditional line-by-line diffs in GitHub with a structured, visual walkthrough.

Solari gives non-technical team members access to agents that work right out of the box.

renderlet is a framework that makes it easy to develop interactive applications. Building applications with high-performance graphics is very hard – existing tools are cumbersome and aren’t truly platform agnostic, leading to frequent rework. With renderlet, developers can write high-level code to describe 2D and 3D graphics without having to use low-level, platform-specific APIs. renderlet automatically compiles graphics code to WebAssembly and embeds a portable rendering engine inside any app, enabling graphics to safely and automatically render on any platform’s GPU. Our runtime is open-source: https://github.com/renderlet/wander

Agentic Labs is making software design and architecture less painful by building AI into the process. Today, developers have no shortage of tools for instantly creating chunks of code, but designing the systems that integrate this code is the hardest and most manual part of software engineering. Our first product is Glide, an AI-first editor purpose-built for writing technical design docs. It connects to your codebase and saves your engineering team time on triage, planning, and implementation of complex code changes.

Identifying performance bottlenecks and strategizing ways to solve them takes 4-8x longer than actually writing the code to fix them. We're building an agent that is an expert at analyzing the performance GPU systems like inference engines at all levels of the stack - from CPU-GPU interactions down to GPU kernels. Pairing our agent with Cursor / Claude Code allows you to automate both the reasoning and code implementation steps of performance optimization. What used to take weeks can now be done in days. Along with our AI agent, we have features such as running diffs on system traces as well as sharing and collaboration features that make our VSCode extension the most powerful way to work on performance optimization.

OneGrep is a DevOps Agent that helps engineers automate manual devops tasks. It works across integrations that teams have to search, correlate, and operate automated tasks like runbook automation during incidents. OneGrep specializes across devops tools to help teams release code faster and more reliably so that engineers can spend more time building rather than being trained in bespoke tools like Observability, Ci/Cd, or Infra. Achintya and Brian are technical co-founders who have deep domain expertise in building and operating systems at scale at Coinbase, Disney, and Amazon. Achintya led the Search Team at Disney enabling DisneyPlus to scale to 70M users in two weeks. Brian was a founding engineer on the team that built the Incident Management Platform at Amazon that helps 30k DAUs in Amazon resolve critical incidents every day. https://www.onegrep.dev

Dragoneye helps devs build their custom video detection models in less than 5 minutes. These models can then be used to power apps and features that use images and videos. No more arduous process of annotating any training data or doing any machine learning work themselves. Try out our demo today at https://playground.dragoneye.ai/ !

Silogy is building an AI-powered platform for chip developers to simulate and debug their designs.

The first version of RecipeUI was a viral project at Robinhood that reached 100% adoption from all engineering and QA teams. When an API broke, anyone from Frontend to QA to PMs could debug without relying on backend engineers

Fastgen is a low-code API and workflow builder with an integrated Postgres DB. Our drag-and-drop platform allows you to rapidly develop custom APIs and workflows with ease. Our integrated Postgres DB makes it even easier to create, read, update, and delete data in your applications.

Dream3D builds generative models to simulate and emulate worlds, real and imagined.

Wild Moose automatically kicks off any root-cause investigation to improve MTTR. Our AI triages issues, analyzes impact, and suggests next steps - all before human intervention is needed.

Prompting: Systematically iterate on prompts - Unified prompt management dashboard - Side-by-side model comparisons - Native support for tools, structured outputs, OpenAPI specs Workflows: The IDE for building steerable, agent-like systems. - Visual graph builder for orchestrating complex AI systems - Support for any model, custom code, and map/reduce functions - Built-in features like loops, parallelism, error handling Workflows SDK: A full-stack SDK + GUI for building AI apps with precision and flexibility. - Bi-directional sync between code and UI - Fine-grained control flow and global state management - Customizable with Docker and streaming support Evaluations: Test-driven development for AI. - Build scalable test suites via UI/API/CSV - Use pre-built or custom metrics for evaluation - Track quality, cost, latency, and regressions over time Retrieval: Powerful RAG infrastructure without the complexity. - Simple APIs for uploading and querying unstructured data - Tweak chunking, embeddings, and search for advanced use-cases - Supports various file types including tables and images Deployments: Update AI systems without redeploying your app. - One-click deploy across any model or provider - Staging environments for safe iteration - Scalable inference endpoints for production use Observability: Full visibility into AI system performance. - Audit logs, debugging tools, and feedback capture - Evaluation loops on live traffic - Dashboards to track cost, latency, errors, and trends

Brainboard is a collaborative and end-to-end solution for engineers to visually design & manage their Cloud infrastructures. We allow companies to lower the learning curve while moving to IaC, build a self serve model, have a service catalog to not reinvent the wheel. Both technical profiles with 25+ years of combined expertise and after working together at a major French Cloud provider, Chafik and Jeremy launched Brainboard in 2020.

Rally is a User Research CRM that makes it easy for teams to do research with their users. By automating outreach, scheduling, incentives, and participant management, Rally replaces messy spreadsheets and disjointed tooling, saving teams hours each week.

We are building a cloud platform to help companies deploy and scale AI applications.

We build the tools companies need to provide performant and scalable authorization for their applications. We’re founded by 3 successful entrepreneurs with expertise in enterprise software, most recently as leaders at Red Hat. Jake and Joey met on the APIs team at Google in 2010. They went on to found Quay, where Jimmy joined as their first hire. Over the past decade, they’ve changed the landscape for building and deploying software.

Alloy is an integration platform used by Amazon, Gorgias, Postscript, & others to launch ERP, commerce, CRM, and various other integrations. Founded in 2019, the company is backed by $27M from a16z, Bain Capital Ventures, Y Combinator, and others.

Nextmv is a DecisionOps platform that accelerates optimization AI teams with tools for deployment, testing, CI/CD, collaboration, and management of decision models. With Nextmv, developers can create scalable, custom decision services complete with unique API endpoints and options to integrate with popular solvers and modeling solutions.

Infield helps software teams keep their open source dependencies up to date. We’re automating away the toilsome work of reading changelogs, assessing risk, and upgrading packages so that software teams can focus on shipping features. We’re a small team of repeat founders passionate about making open source easier to use.

Rutter is the unified API infrastructure powering the next generation of B2B fintech. We help tech-forward companies build seamlessly integrated financial products by connecting to their customers' systems of record, from accounting platforms to e-commerce systems. The financial operations landscape is fragmented across hundreds of platforms (QuickBooks, NetSuite, Shopify, Stripe, etc.). Without Rutter, companies must spend thousands of engineering hours building and maintaining these critical integrations. Our Universal API provides the same level of granularity as direct integrations while using a single, consistent schema. This enables our customers to build end-to-end workflows for financial planning, lending, expense management, AP/AR automation, and more, in days, not months. Leading fintechs like Mercury, Airwallex, and Orb trust Rutter to power their integrated financial solutions. Learn more: https://www.rutter.com/

Mobot (YC W19) is a QA-as-a-service platform using actual mechanical robots to automate testing of repetitive functions on real mobile devices. Mobot's human-supervised robots make it possible to automate mobile app tests that emulators, virtual devices, and existing frameworks can't. This approach eliminates thousands of hours of manual testing, increases testing efficiency and physical device coverage, and captures more bugs in-app before app store launches than software can do alone.

Trained on your unique style, Aesthetic generates high-quality visuals that match your aesthetic in seconds.

In the space of AI coding agents, Anima bridges the LLM design gap. With over 1.5 million installs, Anima is the first option for professional design, product, and R&D teams going from design to code. Thanks to On-brand Vibe-coding, anyone in the team can build fast without breaking your look and feel. No Figma skills required. Anima generates clean and developer-friendly code. So your prototypes could also be used for handoff. Three ways to start - Figma to Code → Instantly generate clean React, HTML, or Vue code from Figma designs. - Website to Code (Cloning / Remixing) → Import any live website and turn it into editable code. - Prompt to Design (coming soon) → Generate high-end UI directly from natural language prompts, automatically styled to your brand. Key features - Start at AnimaApp.com to bring your design or your website to Anima - Chat in Anima playground to iterate on your project's code while staying on-brand - Handoff playground link to engineering - Or, download code to continue with Clause code ot Cursor - Or, publish a public link to share with clients or stakeholders

APIs underpin the internet but are still painful to work with. They are often untyped, unstandardized, and out-of-sync across multiple sources of truth. Fern helps companies deliver SDKs and API documentation that they’re are proud to share with their customers. Since launching in 2023, we’ve been trusted by over 200 customers, including industry leaders like Square, Webflow, ElevenLabs, Auth0, and Intercom, to power their developer and agent experiences. We’re fewer than 40 people, based in Brooklyn, NY, and are building open source.

We are a platform for high-performance browser-based applications. We make it easier for developers to deploy apps that give every user a dedicated backend. This is a system design that apps like Figma and GitHub codespaces use, but it's currently difficult for others to replicate it. We make it as easy as deploying a traditional web server.

Bracket is the two-way data pipeline between popular business tools and backend databases. When ops teams update data in Salesforce or Airtable, and engineers update data in the database, Bracket connects the two sources to reflect the same information.

Reflect is a no-code tool for automated website testing. Instead of building and maintaining complex Selenium tests, companies use Reflect to run automated end-to-end tests without writing code.

Weav is building the digital infrastructure to connect small businesses with financial institutions.

We help developers collaborate at scale and build better APIs. Optic’s open source tools makes it easy for developers to document API changes, review each other’s API changes during code review, and catch breaking changes before they reach production. **tl;dr** It’s version control but for behavior not code. We are taking the really successful ideas from Git / Code Review / CI and applying them to API descriptions and (future) other non-code artifacts. Engineers at [Snyk](https://snyk.io/) use Optic daily to make the new Snyk API great. Read their engineering blog: [Snyk's shift left approach to API development | Snyk](https://snyk.io/blog/snyk-api-development-shift-left/)

CodeStream's IDE plugins take the pain out of code reviews. With one command, request feedback on a snapshot of your repo, including uncommitted & unpushed code, allowing you to verify that your work-in-progress is on the right track. (You can also do it the old-fashioned way by committing & pushing at the end of your dev sprint, of course)

Yhat (YC W15, pronounced y-hat) was an end-to-end data science platform. Acquired by Alteryx (NYSE:AYX)

Paperspace is a cloud computing company creating simple and scalable accelerated computing applications. Our goal is to allow individuals and professional teams to seamlessly build and deploy computationally complex products and services. Paperspace is backed by leading investors including Y Combinator and Initialized Capital. Mission: Our mission is to make cloud computing more accessible through radical simplicity, community-driven technical resources, and straightforward pricing. -- To learn more about Paperspace, please visit https://www.paperspace.com/ or follow us on Twitter at: @hellopaperspace.