Software Engineer - Digital Site Development

About the Company

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 where employees thrive and succeed. This environment is unique in the high-tech world and is central to Costco’s success and culture. The company values its employees and members first, is known for its generosity and community service, and has won many awards for its philanthropy. Costco joins with employees to take an active role in volunteering through various opportunities.

Costco IT operates in a dynamic, fast-paced environment undergoing exciting transformation efforts. As a Software Engineer, you will work across the technology stack (both front-end and back-end) and collaborate with dedicated, highly professional colleagues.

About the Role

Software Engineers at Costco perform development work across the full technology stack, demonstrating versatility in managing projects involving databases, back-end services, or front-end applications. This role focuses on designing and building modern user interface components to enhance the member experience across various digital touchpoints. Responsibilities include delivering capabilities to create delightful user experiences, maintaining them through functional improvements, documentation, profiling, and front-end performance enhancements.

Responsibilities

• Develop conceptual systems architecture designs and supporting technologies to enable new or enhanced functionality, applying principles that promote availability, reusability, interoperability, and security.
• Support release planning activities in conjunction with Product Owners and teams.
• Identify high-level requirements to define and refine a robust testing strategy.
• Support the Product Owner with identifying and defining enablers/work items to maintain the architectural runway of a product/application.
• Define non-functional requirements (e.g., performance, security, resiliency) to support the development of epics and user stories aligned to a value stream.
• Identify technical dependencies across product/application teams to support new or enhanced functionality implementation.
• Perform development, optimization, and automation activities to support product/application implementation.
• Develop and implement front-end architecture to support user interface concepts.
• Increase proficiency in relational and non-relational databases, distributed application architectures, user interfaces, user experience, quality assurance, security, and business value creation.
• Drive engineering best practices to deliver higher quality and scalable solutions.
• Provide the team with development strategy, solution recommendations, and estimates for a given product/application.
• Participate in scrum ceremonies (sprint planning, retrospective, showcases/demos, stand-ups, backlog refinement).
• Create and execute unit tests to validate code changes and use test-driven development (TDD) practices to detect software defects early.
• Estimate, plan, and manage implementation tasks and report on development progress.
• Design, build, debug, optimize, and implement solutions in approved tool sets and databases.
• Develop high-quality, efficient, and fault-tolerant software.
• Support, extend, and build automated CI and CD pipelines.
• Design and deliver DevSecOps automation for app deployment and testing.
• Use APM/monitoring tools (e.g., Dynatrace, Splunk) and browser tools to perform request purepath/waterfall analysis, identify bottlenecks, and suggest improvements.
• Participate in developing and documenting department standards and best practices, and mentor Junior Engineers.
• Identify deficiencies in a product/application’s code base and opportunities to improve overall code quality.
• Collaborate with team members (e.g., Systems Architects, Systems Analysts) to define project specifications and release documentation for all phases of the product development cycle.
• Conduct peer code reviews for software changes made by other Engineers within a team.
• Define remediation tactics for large and complex defects impacting multiple features/capabilities within a product/application.
• Define product/application-specific coding standards and patterns to guide new feature implementation.
• Collaborate with Systems Analysts to decompose solution blueprints and designs into detailed technical requirements.
• Oversee the development of new, highly-responsive, web-based user interfaces using React.js concepts and workflows (e.g., Redux, Server-Side Rendering, Styled Components, Storybook) with a test-driven SDLC.
• Provide coaching to Engineers at multiple levels and drive code reviews while maintaining high-code quality standards.
• Advocate, articulate, and document engineering best practices.
• Adopt technical ownership of features and advance product functionality.
• Meet with Development and Business teams to discuss user interface ideas and applications.
• Advocate for and improve code quality, automated tests, CI/CD initiatives, and developer experience.
• Review application requirements and interface designs.
• Perform troubleshooting for interface software and debug application code.
• Monitor and improve front-end performance.
• Build accessible and reusable components.
• Document application changes and review code.

Requirements

• 7+ years of experience working as a React.js developer.
• 7+ years of experience in React.js, HTML, CSS3.
• Vast experience in JavaScript and React concepts, advanced front-end coding skills, and expert-level understanding of progressive web applications.
• Extensive experience in front-end development and demonstrated ability to work in a fast-paced environment.
• Passion for supporting, collaborating, and coaching Engineering teams.
• Comfortable driving code reviews and operating as an anointed approver.
• 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 of JavaScript ES6+ features (e.g., 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, functional programming, and data structures.
• Strong troubleshooting and problem-solving skills; strong interpersonal, verbal, and written communication skills; ability to build relationships 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 business needs, including weekends, holidays, and rotational on-call as required.

Preferred Qualifications

• Degree or equivalent education in Computer Science or a 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.
• Driven 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 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.
• Proficiency in Google Workspace applications (Sheets, Docs, Slides, Gmail).

Pay

Pay ranges for this role are as follows:

• Level 1: $85,000 - $110,000
• Level 2: $105,000 - $135,000
• Level 3: $130,000 - $160,000
• Level SR: $150,000 - $190,000 (Bonus and Restricted Stock Unit (RSU) eligible)
• Level Staff: $180,000 - $225,000 (Bonus and Restricted Stock Unit (RSU) eligible)

Benefits

Costco offers a comprehensive benefits package, including:

• Paid time off
• Health benefits: medical, dental, vision, hearing aid, pharmacy, behavioral health, employee assistance
• Health care reimbursement account
• Dependent care assistance plan
• Short-term and long-term disability insurance
• AD&D insurance
• Life insurance
• 401(k)
• Stock purchase plan (for eligible employees)