Principal Fullstack Engineer

FlightStory

Enterprise Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 5+ years of experience in designing and shipping complex, large-scale distributed systems in production.
  • Proficient in full-stack development, particularly with TypeScript, React, Node.js, Python, and cloud services like Google Cloud or AWS.
  • Hands-on experience in architecting AI/ML systems and LLM applications at production scale.
  • Ability to navigate across various levels of abstraction, from API design to infrastructure.
  • Strong written communication skills with the ability to produce clear documentation.

Responsibilities

  • Own and evolve the architecture for the most complex systems at Steven.com.
  • Establish engineering standards, patterns, and frameworks for the team.
  • Design the AI-native core of the product, including LLM-powered workflows and intelligent systems.
  • Make decisive high-stakes design calls to mitigate systemic risks.
  • Mentor both senior and junior engineers and uplift the team's coding practices through reviews.
  • Translate ambiguous product concepts into detailed technical plans in collaboration with leadership.

Benefits

  • Opportunity to shape product architecture and team culture as a founding engineer.
  • Mentorship from experienced leaders in engineering and AI.
  • Dynamic work environment in a high-growth startup setting.
  • Potential for significant impact on technology and product direction.
Full Job Description
PRINCIPAL ENGINEER - FULLSTACK

COMPANY : STEVEN.COM

REPORTING TO : VP of ENGINEERING

LOCATION: LOS ANGELES

SALARY : UP TO $185k

ROLE MISSION

The most senior individual contributor engineering seat at Steven.com. You set the technical bar for the whole engineering team, own architecture for the ITO's hardest and highest-stakes systems, and make the calls that don't have a committee to hide behind. Reporting to the CITO and partnering closely with the VP of Engineering & Applied AI, you own technical depth while they own execution and people. Founding team role. What you build in year one shapes the product for years.

KEY OUTCOMES
  • Own the architecture of Steven.com's most complex systems, from design through production and long-term evolution
  • Set the engineering standards, patterns, and abstractions the rest of the team builds on
  • Architect the AI-native core of the product: LLM-powered workflows, intelligent pipelines, and agentic systems that don't exist yet
  • Make the final call on high-stakes design decisions and catch systemic risk before it becomes debt or downtime
  • Mentor senior and junior engineers, raise the bar through code review and architectural conversation
  • Turn ambiguous product bets into concrete technical plans with clear tradeoffs, working directly with CITO, VP Eng, and Product

CORE COMPETENCIES
  • Track record of designing and shipping complex, large-scale distributed systems in production, not just contributing to someone else's
  • Deep full-stack proficiency: TypeScript, React, Node.js, Python, and Google Cloud/AWS
  • Real experience architecting AI/ML systems, LLM applications, or intelligent pipelines at production scale
  • Comfortable reasoning across levels of abstraction at once, from API design to infrastructure to product
  • Sharp written communication, documentation a team can build from and an exec can understand

YOU'LL THRIVE HERE IF
  • You see the whole system and never touch a component without understanding what it's connected to
  • You reason from first principles, not analogy, and you'll challenge inherited architecture if the foundations are wrong
  • You know when to be precise and when to be fast, and you make that call on purpose
  • You have a real point of view on where AI infrastructure is heading
  • You treat architectural decisions as close to permanent, so you document them properly and don't make them lightly
  • You're intellectually honest: you push back early, surface problems fast, and change your mind when the evidence says to

IDEAL BACKGROUND
  • Founding engineer, staff engineer, or technical lead at a startup or high-growth company
  • CS or ML research background with production research experience
  • Published research, open source work, conference talks, or other visible engineering community contribution
  • We care less about titles, years, and pedigree, and more about the systems you can point to and defend end to end


Department Steven.com Locations Los Angeles, US

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