Principal Full Stack Software Engineer

JITX builds code-first tools for circuit board design. The Principal Full Stack Software Engineer will drive technical direction and own product areas end-to-end, beginning with the user and license management system and later contributing to core runtime components for the circuit design engine. The role also helps raise engineering standards through mentorship, code reviews, and reusable technical patterns.

Responsibilities:

• 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

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