# Senior Frontend Engineer
**Company:** [HumanSignal](https://hotfix.jobs/companies/humansignal)
**Location:** Remote
**Salary:** $140K-$200K
**Skills:** React, TypeScript, JavaScript, HTML, CSS, Jest, Cypress, Vite, webpack, Django, REST APIs, Kubernetes, AWS, Postgres, Redis
**Posted:** 2025-12-05
> Senior Frontend Engineer builds and maintains performant, accessible React/TypeScript UIs for AI data labeling, review, and evaluation workflows. Owns product outcomes, prototypes solutions, collaborates with PM/Design, and engages with open-source community.
## Job Description
## Responsibilities

- Build and maintain frontend components and views for labeling, review, and evaluation workflows with performance, accessibility, and scalability in mind.
- Own outcomes, not tasks: refine scope, suggest trade-offs, propose simpler approaches, and land increments that deliver value fast.
- Partner with Product & Design from discovery to delivery: clarify user jobs, write lightweight RFCs/PRDs, and shape scope and milestones.
- Prototype to de-risk UX; use flags/gradual rollouts; gather feedback from users/support and iterate after releases.
- Raise the bar on FE standards: state management, testing, error boundaries, a11y, i18n, and developer ergonomics.
- Partner with Support to investigate production issues, reduce UX papercuts, and turn learnings into fixes.
- Engage with our open-source community (issues, discussions) to understand real-world needs and improve developer experience.
- Participate in architecture discussions and code reviews; mentor teammates and improve patterns across the codebase.

## What you’ll bring

- Senior-level experience shipping production React/TypeScript apps (HTML/CSS mastery; ES6+; a11y).
- Strong product sense: you’ve made scope/trade-off decisions and iterated based on real-world usage and feedback.
- Fluency with modern FE tooling (e.g., Vite/Webpack, Jest/Cypress) and state-management patterns.
- Comfort collaborating with APIs and occasionally touching backend code (Django/REST familiarity is a plus).
- Excellent communication at a Senior IC level—you write clear RFCs/PRDs, give actionable reviews, and present trade-offs well.

## Nice to have

- Experience with data/ML tools, OSS, design systems, or performance profiling.
- Familiarity with feature flags/gradual rollouts and qualitative feedback loops (support forums, user sessions).
- Prior work on complex, data-heavy UIs (review tools, multi-step workflows, or IDE-like apps).

## Our stack

Python/Django, JS/TS, React, OpenAI API, Spark, BigQuery, Kafka, Jest, Cypress, AWS, Kubernetes, Postgres, Redis.

## Location & Compensation

Base cash compensation range is $140,000 to $200,000 USD.
**Apply:** https://hotfix.jobs/jobs/senior-frontend-engineer-at-humansignal-fe9f2571-f3b6-4e46-b5e9-600d1f93dc20
**Canonical:** https://hotfix.jobs/jobs/senior-frontend-engineer-at-humansignal-fe9f2571-f3b6-4e46-b5e9-600d1f93dc20