Front End Engineer - Costco Digital Team @ Costco Wholesale - Chicago, IL

Job Overview

2 months ago

Front End Engineer - Costco Digital Team

Costco Wholesale - Chicago, IL

Costco IT is responsible for the technical future of Costco Wholesale, the third largest retailer in the world with wholesale operations in fourteen countries. Despite our size and explosive international expansion, we continue to provide a family, employee centric atmosphere in which our employees thrive and succeed. As proof, Costco ranks seventh in Forbes “World’s Best Employers”.

This is an environment unlike anything in the high-tech world and the secret of Costco’s success is its culture. The value Costco puts on its employees is well documented in articles from a variety of publishers including Bloomberg and Forbes. Our employees and our members come FIRST. Costco is well known for its generosity and community service and has won many awards for its philanthropy. The company joins with its employees to take an active role in volunteering by sponsoring many opportunities to help others.

Come join Costco Digital - part of the Costco Wholesale IT family. Costco Digital is a dynamic, fast-paced environment, working through exciting transformation efforts. We are building the next generation digital retail environment where you will be surrounded by dedicated and highly professional employees. We are embarking on a large digital transformation and need team members like you to help us grow to the next level.

The Costco Digital team is looking for a skilled React.js Front End Full Stack Engineer that will perform development work. The Full Stack Engineer must have a strong focus on front-end development and demonstrate the ability to work in a fast-paced environment. This role will also be directly responsible for delivering capabilities to create delightful user experiences for our members, and maintaining them through functional improvement, documentation, profiling, and front-end performance enhancements. The Full Stack Engineer will design and build modern user interface components to enhance our member experience over a wide variety of digital touchpoints.

Our Digital team is transforming how we deliver solutions and interact with our members across our Mobile, Commerce and Order Management platforms. We have a culture of improvement & learning with a start up mentality and a customer centric approach for our Costco members and our employees. We are looking for talented individuals to join our team and pursue bold ideas and explore growth opportunities.

If you want to be a part of one of the worldwide BEST companies “to work for”, simply apply and let your career be reimagined.


Oversees the development of new, highly-responsive, web-based user interfaces, using React.js concepts and workflows, such as Redux, Server Side Rendering, Styled Components, and Storybook, using a test driven SDLC.

Develops and implements front-end architecture to support user interface concepts.

Adopts technical ownership of features and advancing product functionality.

Meets with the development and business teams to discuss user interface ideas and applications.

Advocates for and improves code quality, automated tests, CI/CD initiatives, and the developer experience.

Reviews application requirements and interface designs.

Performs troubleshooting for interface software and debugging application code.

Monitors and improves front-end performance.

Builds accessible and reusable components.

Documents application changes and reviews code.


3+ years’ of previous experience working as a React.js developer.

Proficiency in React.js, HTML, CSS3.

Knowledge of JavaScript and React concepts, excellent front-end coding skills, and a good understanding of progressive web applications.

Proficiency with building responsive layouts using CSS and CSS-precompilation.

Strong understanding of cross-browser compatibility.

Ability to integrate 3rd party APIs and a strong understanding of REST and GraphQL patterns.

Proficiency with state and side effect management within client side applications (Redux and Redux Sagas preferred).

Knowledge in JavaScript ES6+ features such as classes, arrow functions, template literals, rest/spread operators, promises, async/await.

Proficiency with client side application bundling and optimization.

Strong understanding of CSS fundamentals, accessible patterns, component design and functional programming, and data structures.

Strong troubleshooting and problem-solving skills; strong interpersonal, verbal, and written communication skills; strong relationship builder in cross-functional teams.

Experience with browser-based debugging and performance testing software.

Experience refactoring code and algorithms for improved performance and robustness.

Self-motivated with a positive, can-do attitude.

Scheduling flexibility to meet the needs of the business, including weekends, holidays, and a rotational on call basis as required.


University degree or equivalent education (Computer Science or related field).

Experience working in a retail ecommerce environment.

Understanding of WCAG 2.1 AA principles, patterns, and screen reader testing.

Experience working on design systems building highly composable, reusable components.

Experience with code review, performance analysis, and understanding of large-scale application infrastructure and dependencies.

Experience translating Figma design mockups and prototypes into working applications.

Knowledge of unit testing frameworks, including Jest and React Testing Library.

Experience working with serverless platforms on Azure or GCP.

Familiarity with design patterns and microservices-based architecture patterns.

Experience with writing complex Graphql, Redis, MongoDB or similar database queries.

Experience with MUI v5 components.

Experience working with Storybook.js and Chromatic.

Experience with Gatsby.js.

Excellent verbal and written communication skills.

Required Documents

Cover Letter


California applicants, please click here to review the Costco Applicant Privacy Notice.

Pay Ranges:

Level 2 - $107,500 - $137,500

Level 3 - $127,500 - $162,500

Level 4 - $152,500 - $182,500 Bonus and Restricted Stock Unit (RSU) eligible

We offer a comprehensive package of benefits including paid time off, health benefits — medical/dental/vision/hearing aid/pharmacy/behavioral health/employee assistance, health care reimbursement account, dependent care assistance plan, commuter benefits, short-term disability and long-term disability insurance, AD&D insurance, life insurance, 401(k), stock purchase plan, SmartDollar financial wellness program, to eligible employees.

Costco is committed to a diverse and inclusive workplace. Costco is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or any other legally protected status. If you need assistance and/or a reasonable accommodation due to a disability during the application or the recruiting process, please send a request to [email protected]

If hired, you will be required to provide proof of authorization to work in the United States.

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