Pioneer Fund

Pioneer Fund is a San Francisco-based venture capital firm founded in 2017 that makes early-stage investments across a wide range of sectors, including consumer products and services, financial services, information technology, advanced manufacturing, blockchain, life sciences, gaming, artificial intelligence and machine learning, construction technology, education technology, fintech, agriculture technology, advertising technology, augmented reality, autonomous vehicles, legal technology, oncology, pet technology, real estate technology, ride-hailing, SaaS and supply chain technology. The firm benefits from a network of more than 420 Y Combinator alumni, enabling it to identify and support YC-backed startups.

Lior Abraham

Venture Partner

Wayne Anderson

Venture Partner

Jon Armstrong

Venture Partner

Tamara Bain

Venture Partner

Kate Bambino

Venture Partner

Past deals in Developer Tools

Browser Use

Seed Round in 2025
Browser Use is a technology company specializing in web accessibility software for AI agents. It enables AI agents to interact with websites by extracting interactive elements, managing multiple browser tabs, and supporting custom actions. The company's software combines visual understanding with HTML extraction, allowing developers to build capable web-based AI agents using various large language models.

Unsloth

Seed Round in 2024
Unsloth is an AI startup dedicated to enhancing the accessibility of artificial intelligence for users across various sectors. The company has developed an open-source fine-tuning and training platform that significantly accelerates the process of customizing large language models (LLMs), making them 2.2 times faster and reducing VRAM usage by 62%. This all-in-one solution is designed to assist scientists and researchers in diverse fields, including skin cancer prediction, DNA sequencing, vaccine development, environmental conservation, and space research. By providing tools that enable the rapid creation of accurate custom models, Unsloth empowers users to analyze large datasets more effectively, thus facilitating advancements in critical areas of research and innovation.

expand.ai

Pre Seed Round in 2024
Expand.ai specializes in transforming any website into a type-safe API, facilitating seamless and secure integration. Its platform, a web scraping tool, offers customizable schemas, rigorous data quality checks, and high-speed extraction capabilities, enabling developers and businesses to efficiently access and integrate reliable web data, thereby reducing operational complexities.

Outerport

Pre Seed Round in 2024
Outerport specializes in streamlining document comprehension through advanced chain-of-memory reasoning technology. Its core product is a model registry platform, facilitating secure and efficient management and deployment of foundation model weights. This enables data scientists and engineers to swiftly load and handle models on existing cloud infrastructure or on-premise hardware, enhancing productivity.

Glasskube

Pre Seed Round in 2024
Glasskube develops a user-friendly package manager for Kubernetes, offering both GUI and CLI interfaces. Its packages are dependency-aware and GitOps ready, with automatic updates available through a central public repository.

NextUI

Seed Round in 2024
NextUI aims to help developers and businesses build effective and visually engaging applications.

Conductor Quantum

Pre Seed Round in 2024
Conductor Quantum specializes in the development of quantum computers, focusing on silicon chip-based systems. The company's core offering is an AI-powered platform designed to automate and expedite the creation and control of qubits, the fundamental units of quantum information. This platform aims to reduce manual intervention and accelerate advancements in quantum computing by optimizing semiconductor chips for quantum applications.

Ellipsis

Seed Round in 2024
Ellipsist is a virtual teammate that turns every engineer into a 10x engineer. After installing into the GitHub repository, developers assign work to the bot, such as creating pull requests, conducting code reviews, and addressing peer feedback.

Guide Labs

Pre Seed Round in 2024
Guide Labs is a software development company that specializes in creating interpretable models. These models are designed to explain their reasoning in a clear, understandable manner, making them easy to steer, debug, and align. The company's primary goal is to help developers and businesses solve errors more efficiently by providing reliable explanations for model behavior, thereby saving time and effort.

Fileforge

Seed Round in 2024
Fileforge is an API for PDF document workflows. With Fileforge, you can generate, manipulate, host, share, sign and track your documents - all in on place. Our open-source library helps developers build complex documents that integrate with our API and external services to build document-centric workflows.

Marblism

Pre Seed Round in 2024
Marblism is a web application development platform designed to serve businesses looking to streamline their application creation process. The platform harnesses an application programming interface that generates code for various components, including front-end, back-end, emails, and notifications. This capability allows users to develop customized applications tailored to their specific needs, enhancing operational efficiency and user experience. Marblism provides a fully functional web-based solution that facilitates the development and deployment of applications, making it a valuable tool for organizations aiming to innovate and improve their digital offerings.

Datacurve

Pre Seed Round in 2024
Datacurve is a technology company that specializes in providing high-quality coding data for applications and large language models. The platform connects businesses with a network of skilled engineers who generate and vet data, ensuring its accuracy and diversity. By focusing on complex coding problems and frameworks, Datacurve helps organizations enhance their generative AI tools and build more capable models.

Stacksync

Pre Seed Round in 2024
Stacksync is a real-time and bidirectional data synchronization tool between CRMs (e.g. Salesforce, Hubspot or SAP) and databases (e.g. Postgres, Google BigQuery,...). Edits made in your CRM will instantly update in your Database, and vice-versa. To set up a sync, users simply have to connect the two chosen apps in one click and select the tables they want to sync, no-code! Stacksync reduces implementation delays from months to minutes for CRM integration projects and removes all the complexity behind CRM new feature development. We show a 90% improvement on delivery time and budget.

Depot

Seed Round in 2023
Depot is a developer-first build platform that uses cloud computing to speed up the software building process. It integrates with the existing container tooling ecosystem to remove compute bottlenecks and simplify learning curves, helping engineers ship features and iterate faster. The company additionally offers an image-building platform aimed at accelerating core product development, featuring optimized build computing, a speed-up system, and a drop-in replacement that speeds up Dockerfile builds and other related tasks.

Vellum

Seed Round in 2023
Vellum is a developer platform for the production of LLM apps.

Talc AI

Seed Round in 2023
Talc AI specializes in accelerating AI app development and deployment. It offers a platform that creates realistic testing scenarios, allowing companies to identify and mitigate risks early in the development process. This enables businesses to launch AI applications faster and with greater confidence.

Silimate

Seed Round in 2023
Silimate is a company that specializes in developing automation platforms aimed at enhancing chip design workflows. Its innovative platform automates the chip design process by utilizing end-to-end workflow software that efficiently analyzes large volumes of log files to assess design status. This technology simplifies the setup of complex experiments through ad hoc scripting while providing tools for debugging errors. By streamlining these processes, Silimate allows clients to concentrate on their core design tasks, thereby improving overall productivity in the chip design sector.

Neum AI

Seed Round in 2023
Helping developers build scalable generative AI applications

Recall.ai

Seed Round in 2022
Recall.ai is a software Development company.

SigmaOS

Seed Round in 2022
SigmaOS develops a specialized browser platform aimed at enhancing productivity for founders, researchers, and content creators. Its browser enables users to consolidate their work within a single window, providing an alternative tool for web-based tasks.

Notebook Labs

Seed Round in 2022
Notebook Labs is a company focused on providing identity infrastructure solutions for the Web3 ecosystem. It operates a cryptography platform that utilizes zero-knowledge technology to establish decentralized, anonymous, and verifiable identities. This enables Web3 protocols to generate Sybil-resistant credentials, allowing users to access Know Your Customer (KYC) services. Users can prove their identity and credentials across various wallets and blockchain networks without disclosing personal information, thus ensuring privacy and security while interacting with decentralized applications.

Instant

Venture Round in 2022
Instant is a company that provides a real-time client-side database for building collaborative applications. It offers a browser-native SDK with support for relational queries, transactions, authentication, permissions, offline functionality, and real-time updates, enabling developers to build responsive user experiences by handling complex data operations on the client side.

Mito

Seed Round in 2022
Mito is a technology company offering cloud-based data analysis tools and model collaboration software. Its platform enables Python-based data analysis in the cloud, supporting data science workflows. The company also develops a spreadsheet collaboration tool that helps teams review and understand changes in models, compare current versions with prior ones, detect direct and indirect changes, and streamline feedback through comments and task assignments. By combining data analysis capabilities with collaborative model review, Mito aims to accelerate insights, improve accuracy, and enhance team productivity for data-driven organizations.

Diversion

Seed Round in 2022
Diversion develops a cutting-edge code management platform that enhances collaboration among software development teams. Its platform offers synchronized environments, custom metadata for repository objects, and a cloud workspace, ensuring secure and efficient collaboration on large-scale code bases while improving developer experience.

Hydra

Pre Seed Round in 2022
Hydra is an open source Snowflake alternative that transforms Postgres into a fast, scalable data warehouse. With Hydra, engineers can standardize both transactional and analytics workloads around the familiar Postgres syntax, tools, and ecosystem without app code changes. Hydra offers a fully managed cloud instance with columnar storage and high throughput writes. In addition, Hydra decouples Postgres' query layer from compute and storage to enable developers to run Postgres queries across any database. Hydra's mission is to end vendor lock-in and standardize on developers' favorite open-source database, Postgres.

Cypher Wallet

Seed Round in 2022
For consumers, Cypher offers an EVM & Cosmos noncustodial wallet & crypto card allow a one-stop-shop for purchasing, bridging, staking, swapping and off-ramping crypto For developers, Cypher offers an seamless onboarding SDK for any dApp in addition to a Push SDK that allows on-chain events to be converted into human, readable mobile push notifications

Hyperbeam

Venture Round in 2022
Hyperbeam is a platform that enables developers to integrate multiplayer web browsers into their applications. It synchronizes audio and video among multiple participants, facilitating real-time collaboration and interaction online.

ContainIQ

Seed Round in 2021
ContainIQ is a Kubernetes native monitoring and tracing platform ContainIQ helps teams to track and observe Kubernetes core metrics, events, and logs. It helps them monitor the health of the cluster with pre-built dashboards and easy-to-set monitors.

DeepSource

Seed Round in 2020
DeepSource is a modern static analysis platform designed to enhance code quality and security for software development teams. It continuously analyzes code to identify security vulnerabilities, performance issues, bug risks, and anti-patterns, enabling developers to discover and automatically resolve these issues before deploying code to production. The platform serves as a central hub for organizations, providing the necessary tools to ensure that software is maintainable and secure. By equipping developers with insights into potential bugs and security risks, DeepSource facilitates informed decision-making and prioritization in the development process.

DeepSource

Seed Round in 2020
DeepSource is a modern static analysis platform designed to enhance code quality and security for software development teams. It continuously analyzes code to identify security vulnerabilities, performance issues, bug risks, and anti-patterns, enabling developers to discover and automatically resolve these issues before deploying code to production. The platform serves as a central hub for organizations, providing the necessary tools to ensure that software is maintainable and secure. By equipping developers with insights into potential bugs and security risks, DeepSource facilitates informed decision-making and prioritization in the development process.

Shogun

Series A in 2020
Shogun Labs, Inc. is a technology company that specializes in creating cloud-based page building tools for e-commerce businesses. Founded in 2015 and headquartered in Walnut, California, Shogun offers a drag-and-drop page builder that allows brands and agencies to design customized landing pages for online stores, particularly for platforms like Shopify and BigCommerce. The company's solutions enable high-growth brands to achieve fast page load times and enhance user experiences, ultimately driving conversions and brand loyalty. By simplifying the web development process, Shogun empowers non-technical users to create appealing and functional online storefronts that effectively showcase their products.

Shogun

Seed Round in 2018
Shogun Labs, Inc. is a technology company that specializes in creating cloud-based page building tools for e-commerce businesses. Founded in 2015 and headquartered in Walnut, California, Shogun offers a drag-and-drop page builder that allows brands and agencies to design customized landing pages for online stores, particularly for platforms like Shopify and BigCommerce. The company's solutions enable high-growth brands to achieve fast page load times and enhance user experiences, ultimately driving conversions and brand loyalty. By simplifying the web development process, Shogun empowers non-technical users to create appealing and functional online storefronts that effectively showcase their products.
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