Principal Full Stack Software Engineer

About the role

Principal Full Stack Software Engineer

About JITX

JITX is revolutionizing circuit board design by making it code-first. Instead of dragging components around in a GUI, engineers write code—or have AI write it for them—to define their circuit boards. We're a ~12-person startup building tools that bring software engineering practices to hardware design.

The Role

We're looking for a principal engineer who can drive technical direction for significant product areas and own them end-to-end. You'll work across our stack—from user management systems to our core design application—making architectural decisions that shape how electrical engineers interact with our product for years to come.

As a principal engineer, you'll be expected to identify technical debt, propose solutions, and drive consensus around the right path forward. Your first major project will be reworking our user and license management system, which you'll architect and largely implement while coordinating with stakeholders across the company. As you ramp up and build context on our domain, you'll transition to working on critical core runtime components that power our circuit design engine.

Beyond your individual contributions, you'll raise the bar for engineering across the team—through code reviews, technical mentorship, and establishing patterns that others can follow.

What You'll Work On

User Management Platform

- TypeScript/React frontend

- Python application server

- Database backend currently in PostgreSQL

- Integration with modern auth solutions (WorkOS or similar)

Graphical User Interface Application

- Electron based React/TypeScript application

- Custom input handling and rendering (not traditional HTML elements)

- Advanced visualization using PixiJS, with potential migration to WebGL/Three.js

- Complex CSS/styling for polished UI/UX

Application Runtime & Architecture

- Algorithm-heavy runtime with complex computational geometry problems

- User-facing Python API for programmatic circuit board design

- Sophisticated architecture driving the application life cycle

- Opportunity to rearchitect core systems to leverage parallel computing and modern hardware capabilities

- Deep technical challenges requiring strong CS fundamentals and architectural vision

What We're Looking For

Must-haves:

- Extensive full stack experience with TypeScript/React and Python, with a track record of architectural decisions at scale

- Strong algorithmic problem-solving skills with understanding of complexity analysis, graph/tree data structures, and computational efficiency

- Ability to drive technical direction and follow through on architectural decisions across the stack

- Experience identifying technical debt, evaluating tradeoffs, and building consensus around solutions