Mainframe Developer Jobs in Colorado (NOW HIRING)

Description

Basic Qualifications:

• Principal Software Engineer: Bachelor’s degree in Science with 5+ years of software development experience; 3+ years with a Master's; 0 years with a PhD; or 4 additional years of experience in lieu of a degree.

• Experience as a front-end, back-end, or full-stack developer

• Experience developing on teams using Agile methodology, process, and tools

• Experience designing, developing, and troubleshooting in Java

• Experience using object oriented design

• Experience using version control software

• Current Top Secret/SCI Counterintelligence Polygraph (CI-Poly)

Preferred Qualifications:

It is preferred that a given candidate has some of the preferred qualification below. No expectation of all.

• Experience designing, developing, and troubleshooting in C++, C, Python, and/or JavaScript

• Experience designing, developing, and troubleshooting in virtualized environments (VMs, AWS Cloud Instances)

• Experience with software development on Red Hat Enterprise Linux

• Experience with Dockerization and Container Management (Dockers and Kubernetes)

• Experience with Atlassian tools (Jira, Confluence, Bitbucket)

• Experience with AWS Services

• Experience with software system integration, testing, and deployment, including but not limited to automation

• Experience with DevOps and/or Site Reliability Engineering

Basic Qualifications:

• Sr Principal Software Engineer: Bachelor’s degree in Science with 9+ years of software development experience; 7 years with a Master's; 0 years with a PhD; or 4 additional years of experience may be considered in lieu of a degree.

• Experience as a front-end, back-end, or full-stack developer

• Experience developing on teams using Agile methodology, process, and tools

• Experience designing, developing, and troubleshooting in Java

• Experience using object oriented design

• Experience using version control software

• Must have a current Top Secret security Counterintelligence Polygraph (CI-Poly)

Preferred Qualifications

It is preferred that a given candidate has some of the preferred qualification below. No expectation of all.

• Experience designing, developing, and troubleshooting in C++, C, Python, and/or JavaScript

• Experience designing, developing, and troubleshooting distributed systems

• Experience designing, developing, and troubleshooting in virtualized environments (VMs, AWS Cloud Instances)

• Experience as a full-stack developer

• Experience with software development on Red Hat Enterprise Linux

• Experience with range of software development phases from research, to new development, and to operations

• Experience with Dockerization and Container Management (Dockers and Kubernetes)

• Experience with Atlassian tools (Jira, Confluence, Bitbucket)

• Experience with AWS Services

• Experience with ground command/control or ground processing systems (scheduling, tasking, antennas, hardware interfaces, data processing)

• Experience with software system integration, testing, and deployment, including but not limited to automation

• Experience with DevOps and/or Site Reliability Engineering

• Experience in leading software engineers in roles such as Scrum Master, Team Lead, Product Owner, or similar

Experience Level

Expert Level

This is a Contract position based out of Aurora, CO.

The pay range for this position is $60.00 - $95.00/hr.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:
• Medical, dental & vision
• Critical Illness, Accident, and Hospital
• 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available
• Life Insurance (Voluntary Life & AD&D for the employee and dependents)
• Short and long-term disability
• Health Spending Account (HSA)
• Transportation benefits
• Employee Assistance Program
• Time Off/Leave (PTO, Vacation or Sick Leave)

This is a fully onsite position in Aurora,CO.

This position is anticipated to close on May 29, 2026.

We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

We’re a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We’re a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We’re strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We’re building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.