Senior JavaScript Engineer

Agilis Systems, LLC - Chesterfield, MO3.1

Full-timeEstimated: $83,000 - $110,000 a year


Agilis Systems is searching for a talented Senior JavaScript Engineer to join our External Products Engineering team. This is an exciting opportunity for someone who wants to be a part of a growing team and a thriving organization. As a senior JavaScript engineer at Agilis, you will be responsible for developing the customer-facing interfaces that exemplify our company's mission to "Simplify the Complicated."


  • Develop new user-facing features
  • Enhance and refactor existing user interfaces
  • Build reusable code and libraries for future use
  • Ensure the technical feasibility of UI/UX designs
  • Optimize applications for maximum speed and scalability
  • Validate user input before submission to backend services
  • Collaborate with other team members and stakeholders
  • Work with customer support to identify and resolve reported issues
  • Understand the full stack implementation, including Java code for backend services
  • Mentor teammates and participate in design and code reviews


  • S. in Computer Science or equivalent experience
  • 5+ years of relevant work experience
  • Willingness and enthusiasm to learn new skills and techniques
  • Ability to work independently on standalone projects or as part of a small team
  • Strong understanding of JavaScript, its quirks, and workarounds
  • Good understanding of web markup, including HTML5 and CSS3
  • Good understanding of ExtJS or a modern JavaScript framework such as React or Angular
  • Good understanding of asynchronous request handling, partial page updates, and AJAX
  • Proficient understanding of cross-browser compatibility issues and workarounds
  • Proficient understanding of code versioning tools, specifically Git and SVN
  • Good understanding of browser rendering behavior and performance
  • Experience with Scrum or other Agile methodologies is highly preferred
  • Familiarity with front-end building tools from Sencha is a plus
  • Familiarity with Java and backend development is a plus


  • Monday through Friday


  • 17 PTO Days
  • Competitive Salary
  • Medical, Dental, Vision, Life, and 401(k) benefits are offered


Agilis Systems, LLC is an Equal Employment Opportunity Employer and will not discriminate against or harass any applicant or employee on any grounds prohibited under any federal, state or local law, including race, creed, color, religion, sex, national origin, age, disability, sexual orientation, marital status, status with regard to public assistance, veteran status, citizenship or membership in any other legally protected class.

Job Type: Full-time


  • in HTML/Javascript: 5 years (Required)
  • relevant work: 5 years (Preferred)


  • Bachelor's (Required)

Work authorization:

  • United States (Preferred)

Benefits offered:

  • Paid time off
  • Dental insurance
  • Health insurance
  • Other types of insurance