Frontend Engineer (React.js)
Sundayy
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About the role
Role Overview
Principal Frontend Engineer (React.js) to lead and enhance a SaaS frontend platform as the company scales rapidly. You will be the primary UI development expert, shaping the technical direction and ensuring fast delivery of high-quality features.
Responsibilities
- Own and evolve the frontend architecture and codebase for scalability, performance, and maintainability
- Develop and ship end-to-end features with a strong focus on quality and UX
- Collaborate with product managers and designers to turn ideas into intuitive interfaces
- Establish and promote lightweight development patterns, tooling, and best practices
- Identify and address technical debt strategically
- Mentor and lead engineers with hands-on guidance and foster a collaborative culture
- Help shape engineering culture and processes as the team grows
Qualifications
- 8+ years building modern web applications
- Deep expertise in React and TypeScript
- Strong product instincts with a focus on user experience
- Proven ability to own frontend systems in early-stage or high-growth startups
- Ability to make fast decisions and iterate quickly under uncertainty
- Strong understanding of frontend performance optimization, state management, and architecture tradeoffs
- Experience working closely with designers and backend engineers in small, dynamic teams
- Excellent communication skills; able to simplify complex concepts and lead discussions
Nice-to-haves
- Not explicitly stated beyond the above experience with ownership, small teams, and rapid iteration.
Benefits (high level)
- Competitive base salary, annual cash bonus, and equity options
- 401(k) match
- Company contributions to medical premiums; fully paid dental and vision
- Unlimited paid time off
- Occasional travel for team sessions (e.g., Reston, VA or other sites)
About Sundayy
Tidal Cyber (described alongside the posting’s “Sundayy” company field) builds cybersecurity solutions using Threat-Led Defense strategies. Founded in 2022 by MITRE veterans, the company has grown rapidly with Series A funding and focuses on helping security teams identify critical threats, assess coverage, and prioritize defenses. The organization emphasizes high ownership, innovation, and building impactful SaaS experiences.
Scraped 5/15/2026