Principal UI Engineer

system_two; Palo Alto (CA); Hybrid; USD 120,000 - 160,000; Full time

Job summary

system_two, based in Palo Alto, CA, is seeking a Principal UI Engineer to develop cutting-edge AI-driven cybersecurity solutions. The ideal candidate will have 8-12+ years of software development experience and strong expertise in front-end technologies like React.js, CSS3, and modern UI frameworks.

You will lead high-impact UI projects, collaborate across teams, and mentor junior developers while ensuring high-quality code standards. Join a passionate team dedicated to innovative cybersecurity solutions.

Qualifications

• 8–12+ years of software development experience, preferably in an Agile environment.
• Expertise in modern front‑end frameworks such as Angular, Vue, and React.
• Strong experience in UI design and development.

Responsibilities

• Collaborate with cross‑functional teams on design and implementation.
• Lead high-impact UI application development for cloud-based applications.
• Oversee the feature development lifecycle from requirements to production.

Skills

UI frameworks design

React.js

CSS3

JavaScript

Agile methodologies

TypeScript

Communication skills

Tools

Git

Docker

Figma

CI/CD tools

Job description

About Us

System Two Security is driving SOC transformation with its unique application of AI computing with an initial focus on generative AI powered proactive threat research, threat analysis and iterative threat hunting. The product’s purpose‑built language agents respond to new threat actors and attack patterns within minutes with its agentic workflows delivering end‑to‑end threat detection and containment from integrated feeds of raw cyber threat advisories. Following a successful early access program (EAP) launched at RSA 2024, the company is introducing its flagship product, S2S Hunter, at Blackhat 2024. Early users of the product include prominent MSSPs, and enterprise SOCs across retail, healthcare, SaaS and technology verticals. It is based in Palo Alto, CA and is venture funded by The Hive.

Job Description

As a Principal UI Engineer at System Two Security, you will be instrumental in developing and maintaining the software stack for our cutting‑edge AI‑driven cybersecurity solutions. This senior role requires advanced front‑end development skills using modern UI technologies, including React.js, CSS5, and Tailwind. Your focus will be on creating seamless, efficient, and scalable applications.

What You Will Do

• Collaborate Across Teams: Work closely with cross‑functional teams to ensure alignment in design and implementation.
• Lead UI Application Development: Take charge of designing and executing high‑impact, high‑visibility UI projects for our cloud‑based applications. Focus on delivering high‑quality results on time.
• Own Feature Development: Oversee the entire feature development lifecycle. Refine requirements, collaborate with UX designers, implement features, and manage successful production rollouts.
• Conduct Code Reviews: Provide constructive feedback during code reviews to foster a culture of continuous improvement and maintain high‑quality code standards.
• Who You Will Work With: You’ll join a global team of dedicated software engineers, working closely with backend teams to develop our next‑gen web application. This role requires active collaboration to ensure consistent code styles, engineering best practices, and adherence to accessibility standards.

Requirements

• 8–12+ years of software development experience, preferably in an Agile environment.
• Proven ability to design and develop UI frameworks that enhance customer experience and contribute to business growth.
• Passion for innovation, learning, and promoting new ideas.
• Expertise in modern front‑end frameworks such as Angular, Vue, and React, with the ability to articulate the benefits of each.
• At least 6 years of experience developing web applications using React/Angular/JavaScript.
• Proficiency in building web components using design systems and design tokens.
• Strong communication skills, with the ability to document and present ideas across the engineering organization.
• At least 5 years of experience with standard web technologies: JavaScript, HTML5, CSS3, TypeScript.
• Solid understanding of software design patterns and principles.
• Experience with state management libraries (e.g., Redux, MobX).
• Proficiency in CSS‑in‑JS libraries (e.g., styled‑components, Emotion).
• Knowledge of performance optimization techniques for front‑end applications.
• Strong experience in UI design and development.
• In‑depth knowledge of front‑end security best practices.
• Experience building full‑stack solutions on public cloud infrastructure (AWS preferred).
• Familiarity with container technologies such as Docker.
• Hands‑on experience with CI/CD pipelines.
• Experience with UI build tools such as npm, Grunt, Webpack, and Gulp.
• Familiarity with version control systems like Git.
• Experience with security scanning tools (e.g., WhiteSource, Coverity).
• Proficiency in CSS preprocessors like Stylus, Sass, or Less.
• Experience using design tools like Figma and integrating design tokens.