JITX
YC S18San Francisco, US · Founded 2017 · 18 employees · Hiring · 4 known investors
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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.

Investors · 4
Company profile
researched Aug 2026JITX 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 reportedCompany-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 overlapCompanies 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
- JITXjitx.com · web
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.











