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JITX

YC S18

San Francisco, US · Founded 2017 · 18 employees · Hiring · 4 known investors

Find your way into JITX

526 people in our graph share verified history with the JITX team — schools, employers, funds. One of them is your warm intro.

Scott Davisunlockedknows Duncan Haldane · together at University of California, Berkeley (overlapped)
×8knows the team · via University of California, Berkeley
×3knows the team · via Florida State University

JITX develops software to automate hardware and circuit board design for electronics companies. The platform uses algorithms for physical design automation to help teams design better electronics.

Also known as JITX

Founders & leadership· Y Combinator alumni (S18)

JITX was founded in 2017 by Duncan Haldane, Jonathan Bachrach, and Patrick Napa.

DHDuncan Haldane
Duncan HaldaneinCo-founder/CEOHe previously conducted research at UC Berkeley as a research scientist and PI, focusing on bio-inspired robotics and robotic locomotion systems.
JBJonathan Bachrach
Jonathan BachrachinEngineering Leader / Cofounder
PN
Patrick NapaCo-founder

Investors · 4

Company profile

researched Aug 2026

JITX develops an electronic systems design platform that turns engineering requirements into code-based printed circuit board designs. Users express requirements, constraints, board stackups, signal-integrity targets, and manufacturing rules in Python; an approved AI model proposes edits to that code, and JITX compiles it into schematics, board structures, pin assignments, routing, and fencing that engineers can read and review.

The platform is positioned for high-frequency board work, where it automates the setup of electromagnetic simulation studies. JITX configures ports, sweeps, boundaries, and metrics for Ansys HFSS from stated requirements, dispatches the simulations, and feeds measured results back into the next code revision, forming an iterative optimization loop. The company states the same loop generalizes to other domains such as SPICE, power, and thermal analysis. Manufacturing knowledge — stackups, material effects, vias, clearances, and proprietary practices — is encoded in local design files, and the software is designed to run on the customer's own computers and infrastructure with the customer's approved AI models.

Business model

JITX sells software that runs on customer infrastructure, with a free entry tier, published plans, and a demo-request sales motion for larger engineering organizations.

Traction

Publicly named users include Honeywell Aerospace, Lockheed Martin, and OpenAI. A Honeywell Aerospace director of engineering is quoted describing a substantial reduction in the time and effort required to complete a design cycle.

Full profile — market position, technology, go-to-market

Market position

The company describes itself as a next-generation electronic systems design platform and a code-based, AI-driven PCB design tool within the EDA market, and names Honeywell Aerospace, Lockheed Martin, and OpenAI as customers.

JITX contrasts its approach with adding seats of conventional layout tools and with AI copilots that draft answers but stop short of production-level design, arguing that high-performance geometry, HFSS setup, manufacturable routing, and customer rule checks require the design primitives and solvers it supplies. Designs, rules, and in-house knowledge remain in local files on customer infrastructure.

Technology

A Python-based design description compiles into electronic designs through JITX-supplied primitives: routing solvers, schematic generation, pin assignment, fencing, stabilization, and an HFSS interface. AI models edit the design code, while simulation and rule checks provide measured feedback for subsequent iterations. Modeling extends to manufacturing effects including fiber weave, oxide, and surface roughness. The company cites an example optimizing a 56 GHz Nyquist PCIe Gen7 BGA launch and deskew to -30 dB return loss and -40 dB common-to-differential mode conversion using five HFSS simulations.

Go-to-market

Direct engagement through demo requests, proof-of-concept optimization runs on a prospect's own design and compute, a free starting tier, trade show exhibiting, and a company newsletter and blog.

Hardware and electronics engineering teams, including signal-integrity and layout engineers in aerospace and other high-reliability sectors designing high-frequency boards.

Compiled by commissioned research from 1 cited public sources — announcements, filings, and press listed under research sources below.

Key figures

latest reported
HeadcountAug 202614
HFSS simulations required for cited 56 GHz PCIe Gen7 BGA launch optimizationJan 20265 simulations

Company-reported or press-reported figures, each dated to when it was claimed — not independently audited.

Founder mafia

3 people who came through JITX went on to found or lead other companies.

Competitors · 6

by search overlap
CircuitMind Inc.10 shared keywordsCircuit Mind develops a platform that converts hardware architecture into verified schematics and bills of materials using algorithms and software for electronics engineers and design teams.
Quilter10 shared keywordsQuilter builds physics-driven AI that automatically generates printed circuit board (PCB) layouts, using Maxwell's equations, thermodynamics, and manufacturing constraints rather than human design patterns. It serves hardware engineering teams as an alternative to traditional EDA tools, aiming to replace manual trace routing with automated computation.
Celus9 shared keywordsCELUS provides AI-driven automation software for electronics engineering, helping engineers design and develop electronic circuits faster. It targets electronics design and hardware engineering teams.
NVIDIA8 shared keywordsNVIDIA designs GPUs, AI computing hardware, and software platforms for AI development, data centers, autonomous vehicles, and robotics, serving developers, researchers, and enterprises. Its offerings include AI models, power architecture for AI factories, and compute infrastructure used across industries such as manufacturing, healthcare, and automotive.
Atlas 3D8 shared keywordsSiemens provides industrial products, services and software spanning the industrial lifecycle, using AI, simulation and smart technologies for digital transformation. Its offerings include building operations management and modular, interoperable solutions for enterprise and industrial customers.
ChatGPT7 shared keywordsChatGPT is an AI assistant that generates text responses, creates images, and processes uploaded files based on user prompts and saved chat history.

Companies competing with JITX for the same Google search keywords, organic and paid, via search-intersection analysis.

In the news

Research sources · 1

primary sources listed

1 public sources were cited for this profile; the first-party ones are listed here.

Frequently asked questions

What does JITX do?
JITX is a code-based electronic design automation platform that generates and validates circuit board designs from requirements.
Who founded JITX?
JITX was founded by Duncan Haldane, Jonathan Bachrach, Patrick Napa in 2017.
Who are JITX's investors?
JITX's investors include Y Combinator, FundersClub, Harpoon Ventures, Sequoia Capital.
Where is JITX headquartered?
JITX is headquartered in San Francisco, US.