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 ~20-person startup building tools that bring software engineering practices to hardware design.

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.

• TypeScriptrig###?**
• Python application server
• Database backend currently in PostgreSQL
• Integration with modern auth solutions (WorkOS or similar)

• Electron based React/Type Script 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

• 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

• Extensive full stack experience with Type Script/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
• Abilitysess to drive technical direction and follow through on architectural decisions across the stack
• Experience identifying technical debt, evaluating tradeoffs, and building consensus around solutions
• Self‑directed work style with strong product sense and ability to unblock yourself and others
• Experience gathering requirements from stakeholders and translating them into technical solutions and system designs*?*
• Track record of owning large, complex features from planning through production
• Ability to mentor and raise technical standards across a team through code reviews and establishing best practices
• Comfortable working with ambiguity in a startup environment

• Experience with graphics/visualization libraries (PixiJS, Three.js, WebGL)
• Background in developer tools or technical products
• Mongo
  
  DB and Postgre
  
  SQL experience, or other databases
• Auth/identity management systems (WorkOS, Auth0, etc.)
• Polyglot programming experience—comfortable across multiple languages and paradigms
• Interest in hardware, electronics, or CAD tools

You're a veteran software engineer who's worked across multiple environments and knows that early‑stage startups offer the best combination of impact and interesting problems to solve.

You have a nose for bottlenecks—you spot where things are getting stuck and jump in to help get features across the finish line. You're naturally curious about architecture, always tinkering to find proactive improvements that can ship quickly. You move fluidly across the codebase and the team, bringing speed without sacrificing quality.

Your algorithmic problem‑solving is strong and you don't shy away from maths and logic. You're…