Principal Full Stack Software Engineer

JITX is a startup developing code-first tools for circuit board design. The Principal Full Stack Software Engineer will drive technical direction for significant product areas and own projects end-to-end across user management, graphical applications, and core circuit design runtime systems. The role includes architectural decision-making, implementation, technical mentorship, and improving engineering standards.

Responsibilities:

• Drive technical direction for significant product areas and own them end-to-end
• Work across the stack—from user management systems to the core design application—making architectural decisions that shape how electrical engineers interact with the product
• Identify technical debt, propose solutions, and drive consensus around the right path forward
• Rework the user and license management system by architecting and largely implementing it while coordinating with stakeholders across the company
• Transition to working on critical core runtime components that power the circuit design engine
• Raise the bar for engineering across the team through code reviews, technical mentorship, and establishing patterns that others can follow
• Build the user management platform with a TypeScript/React frontend, Python application server, PostgreSQL database backend, and integrations with modern authentication solutions
• Develop the Electron-based React/TypeScript graphical user interface application
• Implement custom input handling and rendering
• Develop advanced visualization using PixiJS, with potential migration to WebGL/Three.js
• Create complex CSS/styling for a polished UI/UX
• Work on the algorithm-heavy runtime involving complex computational geometry problems
• Develop the user-facing Python API for programmatic circuit board design
• Work on the sophisticated architecture driving the application life cycle
• Rearchitect core systems to leverage parallel computing and modern hardware capabilities

Requirements:

• 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
• 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
• You're a veteran software engineer who's worked across multiple environments
• Your algorithmic problem-solving is strong and you don't shy away from maths and logic
• You're comfortable reasoning about complexity at various levels of abstraction, working with graph and tree structures, and finding elegant solutions to hard computational problems
• You're responsible with your craft. You plan, you test, you own large features end-to-end
• At a principal level, you're also a multiplier. You make the engineers around you better through thoughtful code reviews, clear technical communication, and by establishing patterns that scale beyond your own code
• You thrive when given ownership of a problem space. You don't need your hand held, but you're not afraid to raise your hand when you need context or when you spot a problem with the plan
• Experience with graphics/visualization libraries (PixiJS, Three.js, WebGL)
• Background in developer tools or technical products
• MongoDB and PostgreSQL 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