Demo

Front End Senior Staff Software Engineer

MKS2 Technologies
Sunnyvale, CA Full Time
POSTED ON 6/9/2026
AVAILABLE BEFORE 8/9/2026
What does a great Sr Staff Software Engineer – Web do?
Every day, Clover devices handle the core credit card and point-of-sale processing for hundreds of thousands of merchants. Behind the scenes, we operate a cloud platform providing processing, storage and collaboration for merchants, application developers, service providers and our merchants' customers. Our devices and platform form the backbone of millions of payment interactions between merchants and their customers daily. We are looking for self starters with a passion for technology who want to help us impact millions of merchant’s lives one transaction at a time. The Sr Staff Software Engineer will own one, or more, of the web services; add new features, resolve bugs, and refactor/ improve code base.
As a Sr Staff Software Engineer – Web , you can look forward to:
  • Identifying technical requirements in product meetings and assist the business team with realistic project planning and feature development; translate product requirements into functional, maintainable, extensible software that is in-line with company objectives
  • Taking ownership of new products/features from development through deployment and production monitoring
  • Writing automated tests for new web features and update existing tests as needed
  • Collaborating with Server Application Engineers to determine the best way to maintain low response times as new features are designed
  • Working with QA to develop test plans/strategies
  • Participating in a regular on call rotation
Basic Qualifications for Consideration:
  • Bachelors Degree, preferably in Computer Science or related field
  • 8 - 10 years professional Javascript web application development exp.
  • Deep knowledge and experience with Javascript/Typescript, Browser DOM APIs, HTML5 and CSS/SASS/LESS
  • Understanding web build systems - Webpack, Gulp, Grunt etc.
  • Experience with multiple Javascript frameworks - React/Angular/Ember/Vue/Extjs/Backbone
  • Strong understanding of web application architecture
  • Extensive experience with API integration and best practices - REST, GraphQL ext.
  • Experience with web deployment constructs - CDN, NGINX, URL Rewriting, Web Config Management
  • Detailed knowledge of general web concepts: HTTP, CORS, Security Headers, Browser Caching
  • Superior problem-solving skills and debugging ability
  • Knowledge/experience with web ADA compliance (ARIA, keyboard nav, screen-readers)
  • Experience with backend technologies and databases - Java, Mysql etc.
  • Experience working with a cloud platform: AWS, Google Cloud, Azure etc.
  • Experience supporting high-traffic web applications.

Salary.com Estimation for Front End Senior Staff Software Engineer in Sunnyvale, CA
$136,916 to $163,594
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