Full-Stack Engineer: Scale APIs & Systems (Hybrid)

Ethos; San Francisco, Northern (CA, KY); Hybrid; USD 96,000 - 169,000; Full time

Job summary

Ethos is hiring a Software Engineer in a hybrid San Francisco role. You will design, build, and maintain scalable fullstack services and APIs, collaborating with engineers, PMs, and stakeholders to deliver features. You will optimize performance, participate in code reviews, and promote best practices across teams.

The role emphasizes frontend work with React, HTML, CSS, and security awareness, plus experience with distributed systems and scale. Relocation to SF may be considered.

Qualifications

• 2-5 years of software engineering experience in fullstack roles.
• Strong front-end with HTML, CSS, and React understanding.
• Experience shipping features with API design and performance focus.
• Knowledge of security principles and common attack defenses.
• Familiarity with A/B testing platforms and feature flags.

Responsibilities

• Design, build, and maintain scalable fullstack services.
• Collaborate with engineers, PMs, and stakeholders to ship features.
• Design, build, and maintain internal APIs.
• Identify and resolve performance issues; participate in code reviews.
• Share best practices and coding standards with the team.

Skills

HTML

CSS

React

APIs

Web performance

CS fundamentals

Security basics

Troubleshooting

Code reviews

Communication (verbal)

Communication (written)

Frontend tooling

Backend architecture

A/B testing platforms

Mobile-first design

Mentoring

Tools

Optimizely

Webpack

Iterable

Twilio

Salesforce

Regal

Copilot/AI tooling

Job description

Ethos is hiring a Software Engineer in a hybrid San Francisco role. You will design, build, and maintain scalable fullstack services and APIs, collaborating with engineers, PMs, and stakeholders to deliver features. You will optimize performance, participate in code reviews, and promote best practices across teams.

The role emphasizes frontend work with React, HTML, CSS, and security awareness, plus experience with distributed systems and scale. Relocation to SF may be considered.