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Sr. Front-End Engineer

Job in California, Moniteau County, Missouri, 65018, USA
Listing for: 80Twenty LLC
Full Time position
Listed on 2026-01-03
Job specializations:
  • Software Development
    React.js, Software Engineer
Salary/Wage Range or Industry Benchmark: 200000 - 300000 USD Yearly USD 200000.00 300000.00 YEAR
Job Description & How to Apply Below
Location: California

This is a once in a life time opportunity to join what is soon to be a unicorn pharma / health start-up.

This role offers top of the market salary range as well as a very strong equity package.

We are looking for a Senior Frontend Engineer that are ready to work hard and rapidly grow with our client, Innovations, to create interfaces and flows for new verticals at at our client's San Francisco office. This is a 100% on-site role in San Francisco.

You’ll play a key role in crafting best-in-class web and mobile experiences for both customers and providers.

Responsibilities

Work within a small team of Project Managers, designers, and back-end engineers to deliver seamless, intuitive user experiences.

Help the team make long-term decisions on a quickly scaling projects.

Lead the development, optimization and expansion of web and/or mobile applications. (React, React Native, Type Script)

Own key architectural decisions, mentoring engineers, and elevating front-end expereince across the company.

Influence engineering culture, contributing to the innovation and technical ownership within the team.

Qualifications:

3+ years of front-end development experience, with expertise in React and React Native, as well as some exposure to Kotlin / Swift. (e.g. Apple Health Kit React Native Integrations)

Experience leading technical initiatives and high-performance web and mobile applications.

Strong knowledge of modern front-end tooling.

Expertise in state management strategies and optimizing complex UX interactions in applications (data heavy).

A passion for creating flawless user experience.

Startup mindset

Excellent documentation, organization, and communication skills.

Willingness to go beyond core responsibilities

Salary: $200,000-$300,000 annually + equity

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