Senior Frontend Engineer: Build Scalable UI Foundations

Twenty80 LLC

San Francisco (CA)

On-site

USD 180,000 - 230,000

Full time

14 days+

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Job summary

Twenty80 LLC in San Francisco is seeking a Sr. frontend engineer to build and refine our digital platform. You will create interactive interfaces, set engineering standards, and deliver work that users experience directly.

You will lead UI development from concept to production, mentor peers, and collaborate with design and product teams to translate ideas into scalable, accessible applications. This role offers ownership in a fast-growing startup climate with opportunities to influence frontend

Qualifications

3–6 years frontend experience in product-focused environments.
Able to translate designs into accessible, production-ready apps.
Experience leading substantial frontend projects.
Mentor team members and contribute to frontend strategy.

Responsibilities

Own the development of user interfaces from concept to deployment, including maintenance.
Establish standards for component architecture, coding quality, testing.
Mentor colleagues and share reusable frontend patterns.
Collaborate with stakeholders to translate designs into production-ready apps.
Develop responsive web apps using React, TypeScript, and modern styling.
Write scalable, well-tested code.
Decide data flow and component structure.
Balance speed with quality in a fast-paced environment.