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Sr. Front-End Engineer (W2

Job in Los Angeles, Los Angeles County, California, 90079, USA
Listing for: Braintrust
Full Time, Part Time position
Listed on 2026-08-22
Job specializations:
  • Software Development
    Web Developer, Front End Developer
Salary/Wage Range or Industry Benchmark: 160000 - 190000 USD Yearly USD 160000.00 190000.00 YEAR
Job Description & How to Apply Below
Position: Sr. Front-End Engineer (W2)

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Join to apply for the Sr. Front-End Engineer (W2) role at Braintrust

  • Must be able to work 3 days a week on site (either LA or Irvine offices)
  • Must be able to work under a W2 contract.


Job Description

  • Long term contract until July 2025.
  • Must be able to work 3 days a week on site (either LA or Irvine offices)
  • Must be able to work under a W2 contract.
We are looking for a senior level front-end engineer to join our vibrant and high-performing team. We are completely overhauling the investor website that is used by millions of individual investors and tens of thousands of financial advisors across the U.S. Our front-end is built on React and sits on top of a RESTful service layer with the whole set up running on AWS.

A collaborative React ninja with experience in building high-performing public facing transactional applications will be welcomed to our team. Join us.

Responsibilities & Duties:

  • Work with product managers and other subject matter experts to validate requirements and related designs.
  • Collaborate with UX designers to inform implementation and identify opportunities for componentization.
  • Identifying, defining, and grooming of developer stories in collaboration with product owners/scrum master to prioritize and plan.
  • Implementation of re-usable components and reference implementations (when needed).
  • Collaborate with back-end engineers to design and agree upon on experience layer APIs.
  • Work with QA / test team to define and develop test plans, suites, cases.
  • Proactively ensure individual code quality (e.g., well organized, scalable, good component composition, etc.).
  • Regularly conduct PRs / code reviews within the feature team to ensure broader code quality.
  • May conduct some level of testing (e.g., unit testing, integration testing).
  • Troubleshooting, eliminating bugs / defects, and making optimizations throughout the application lifecycle.
  • Contributing to documentation throughout the application lifecycle (when needed).
  • Occasionally develop prototypes and conduct proofs of concept.


Qualifications & Skills

  • At least 7 years of experience in software engineering / app development.
  • Experience building and supporting public facing transactional web applications preferred.
  • Experience in banking, financial services, or e-commerce industry preferred.
  • Undergraduate degree in computer science, engineering, or another technical field
Must Haves:

  • Proficiency in modern JavaScript (ES6+), including concepts like closures, promises, async/await, and modules.
  • Proficiency in React and its core concepts, including JSX, event handling, component lifecycle methods, and hooks.
  • Understanding of React state management, API handling, react-redux patterns, and the Vite testing suite
  • ReactJS frameworks, libraries, and developmental tools such as MaterialUI, Vitest, and Storybook, as well as working from design applications such as Zeplin.
  • Interacting with RESTful APIs involves understanding best practices for efficiently fetching and handling data to ensure optimal performance and user experience.
  • Using various tools and libraries to mock data and methods in a testing environment, such as Vite, Jest, and MSW (Mock Service Worker), and a comfort level using tools like Postman for advanced mocking scenarios.
  • Proficiency in advanced CSS techniques, including CSS-in-JS. Must have experience with this pattern/approach, as it differs significantly from writing traditional style sheets.
  • Ensuring code quality with test case management tools and other utilities (e.g., linting tools)
  • Proficiency in Git and Git concepts, including creating and managing pull requests, and conducting thorough pull request reviews.
  • Proficiency in Type Script, including a strong understanding of interfaces, types, generics, and advanced type features.
Seniority level
  • Seniority level

    Mid-Senior level
Employment type
  • Employment type

    Full-time
Job function
  • Job function

    Engineering and Information Technology
  • Industries Technology, Information and Internet

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