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Freelance Senior Software Engineer Jobs in Colorado

Senior Software Engineer

Boulder, CO

$137K - $180K/yr

We are seeking a Senior Software Engineer to become an integral part of our team! You will be responsible for creating and modifying computer application software or specialized utility programs. As ...

Senior Software Engineer

Aurora, CO ยท On-site

$170K - $260K/yr

Are you a Senior Software Engineer who is ready for a new challenge that will launch your career to the next level? * Tired of being treated like a company drone? * Tired of promised adventures ...

Senior Software Engineer

Boulder, CO ยท On-site

$137K - $180K/yr

We are seeking a Senior Software Engineer to become an integral part of our team! You will be responsible for creating and modifying computer application software or specialized utility programs. As ...

Senior Software Engineer

Denver, CO ยท On-site

$126K - $166K/yr

Senior Software Engineer Job Type: Full-time Location: Hybrid - Denver, CO (3 days on-site per week) About CloudBees CloudBees helps organizations build, run, and govern software factories, giving ...

Senior Software Engineer

Denver, CO

$126K - $166K/yr

Senior Software Engineer Job Type: Full-time Location: Hybrid - Denver, CO (3 days on-site per week) About CloudBees CloudBees helps organizations build, run, and govern software factories, giving ...

Senior Software Engineer

Boulder, CO ยท On-site

$90K - $120K/yr

We are seeking a Senior Software Engineer to become an integral part of our team! You will be responsible for creating and modifying computer application software or specialized utility programs. As ...

Senior Software Engineer

Denver, CO ยท On-site

$126K - $166K/yr

Candid Health is seeking a Senior Software Engineer to conceptualize, design, build, and maintain complex services and platforms. The role involves close interaction with customers to address their ...

Senior Software Engineer

Denver, CO ยท On-site

$130 - $170/hr

As a Senior Engineer, you will serve as a critical technical problem-solver-- who takes extreme ownership of building scalable, highly reliable software systems in an agile environment. In this role ...

Senior Software Engineer

Boulder, CO ยท On-site

$90K - $120K/yr

We are seeking a Senior Software Engineer to become an integral part of our team! You will be responsible for creating and modifying computer application software or specialized utility programs. As ...

Senior Software Engineer

Denver, CO ยท On-site

$130K - $170K/yr

As a Senior Engineer, you will serve as a critical technical problem-solver- who takes extreme ownership of building scalable, highly reliable software systems in an agile environment. In this role ...

Senior Software Engineer

Denver, CO ยท On-site

$150K - $185K/yr

Senior Software Engineer Department: Technology Employment Type: Full Time Location: Denver Headquarters Compensation: $150,000 - $185,000 / year Description Project Canary is a climate technology ...

Sr. Software Engineer

Greenwood Village, CO ยท On-site

$124K - $163K/yr

Job#: 3047185 Sr. Software Engineer Location: Greenwood Village, Colorado (Hybrid) Role Overview We are seeking a Senior Software Engineer to drive the development of mission-critical mobile platform ...

Senior Software Engineer

Boulder, CO ยท On-site

$127K - $167K/yr

Job summary A Senior Software Engineer with exceptional data and software engineering skills, and a passion for building data-centric applications is to join our team of software developers, data ...

Senior Software Engineer

Boulder, CO ยท On-site

$120 - $180/hr

Job summary A Senior Software Engineer with exceptional data and software engineering skills, and a passion for building data-centric applications is to join our team of software developers, data ...

Sr. Software Engineer

Denver, CO ยท On-site

$126K - $166K/yr

Job Title: Sr. Software Engineer Location: Denver, CO 80202 Duration: 1+ Year ( Might convert full time) What candidates need: Proven experience with multiple Object Oriented languages Passionate ...

Senior Software Engineer

Boulder, CO

$127K - $167K/yr

Job summary A Senior Software Engineer with exceptional data and software engineering skills, and a passion for building data-centric applications is to join our team of software developers, data ...

Showing results 41-60

Freelance Senior Software Engineer information

What is a freelance senior software engineer?

Freelance Senior Software Engineers are highly experienced software professionals who work independently rather than as full-time employees of a single company. They take on contract-based projects for various clients, often leading development teams, architecting systems, and solving complex technical problems. Their responsibilities typically include coding, reviewing code, mentoring junior engineers, and ensuring that software solutions meet client requirements. Freelance senior engineers offer flexibility and specialized expertise, making them a valuable asset for businesses needing advanced software solutions without long-term commitments.

What are some common challenges faced by freelance senior software engineers when managing multiple client projects simultaneously?

Freelance Senior Software Engineers often juggle multiple projects for different clients, which can present challenges such as balancing competing deadlines, adapting to varying coding standards, and maintaining clear communication across diverse teams. Time management and setting realistic expectations are crucial to ensure high-quality deliverables. Additionally, staying up to date with new technologies and industry best practices helps maintain a competitive edge and satisfy client requirements.

What are the key skills and qualifications needed to thrive as a freelance senior software engineer, and why are they important?

To thrive as a Freelance Senior Software Engineer, you need advanced programming expertise, strong problem-solving skills, and a proven track record in software development, often backed by a relevant degree and years of experience. Familiarity with version control systems like Git, cloud platforms such as AWS or Azure, and mastery of frameworks and languages (e.g., JavaScript, Python, Java) are crucial, along with certifications like AWS Certified Solutions Architect or Microsoft Certified: Azure Developer Associate. Outstanding communication, time management, and self-motivation are vital soft skills for independently managing projects and collaborating with diverse clients. These competencies ensure you can deliver high-quality, scalable solutions while building strong client relationships and managing multiple projects efficiently.

What is the difference between Freelance Senior Software Engineer vs Freelance Software Developer?

AspectFreelance Senior Software EngineerFreelance Software Developer
Experience LevelTypically 5+ years, with leadership and architecture skillsVaries from entry-level to mid-level, focused on coding and implementation
ResponsibilitiesDesigning systems, leading projects, mentoringWriting code, developing features, fixing bugs
CredentialsStrong portfolio, possibly certifications like AWS, ScrumPortfolio, coding skills, possibly certifications
Work EnvironmentRemote or client-site, often in tech companies or startupsRemote or client-site, in various industries

Freelance Senior Software Engineers typically have more experience, leadership responsibilities, and focus on system design, while Freelance Software Developers concentrate on coding and feature development. Both roles are in high demand in the freelance market, but the senior role often commands higher rates due to expertise and project scope.

What are the most commonly searched types of Senior Software Engineer jobs in Colorado?

The most popular types of Senior Software Engineer jobs in Colorado are:

What are popular job titles related to Freelance Senior Software Engineer jobs in Colorado?

For Freelance Senior Software Engineer jobs in Colorado, the most frequently searched job titles are:

What cities in Colorado are hiring for Freelance Senior Software Engineer jobs?

Cities in Colorado with the most Freelance Senior Software Engineer job openings:

Infographic showing various Freelance Senior Software Engineer job openings in Colorado as of August 2026, with employment types broken down into 85% Full Time, 10% Part Time, and 5% Contract. Highlights an 87% Physical, 3% Hybrid, and 10% Remote job distribution.

Senior Software Engineer

GliaCell Technologies

Aurora, CO โ€ข On-site

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 17 days ago


Job description

***An active or rein-statable TS/SCI with Polygraph security clearance is REQUIRED. Please do not apply if you currently do not possess this level of clearance.***
Are you a Senior Software Engineer who is ready for a new challenge that will launch your career to the next level?

  • Tired of being treated like a company drone?
  • Tired of promised adventures during the hiring phase, then dropped off on a remote contract and never seen or heard from the mothership again?
  • Our engineers were certainly tired of the same.  

At GliaCell our slogan is “We make It happen”.

  • We will immerse you in the latest technologies.
  • We will develop and support your own personalized training program to continue your individual growth. 
  • We will provide you with work that matters with our mission focused customers, and surround you with a family of brilliant engineers. 

Culture isn’t something you need to talk about…if it just exists. 

If this sounds interesting to you, then we’d like to have a discussion regarding your next adventure! If you want to be a drone, this isn’t the place for you.

We Make It Happen!

GliaCell Technologies focuses on Software & System Engineering in Enterprise and Cyber Security solution spaces. We excel at delivering stable and reliable software solutions using Agile Software Development principles. These provide us the capability to deliver a quick turn-around using interactive applications and the integration of industry standard software stacks.

GliaCell’s Enterprise capabilities include Full-Stack Application Development, Big Data, Cloud Technologies, Analytics, Machine Learning, AI, and DevOps Containerization. We also provide customer solutions in the areas of CND, CNE, and CNO by providing our customers with assessments and solutions in Threat Mitigation, Vulnerability Exposure, Penetration Testing, Threat Hunting, and Preventing Advanced Persistent Threat.

We Offer:

  • Long term job security
  • Competitive salaries & bonus opportunities
  • Challenging work you are passionate about
  • Ability to work with some amazingly talented people

Job Description:

GliaCell is seeking a Senior Software Engineer on one of our subcontracts. This is a full-time position offering the opportunity to support a U.S. Government customer. The mission is to provide technical expertise that assists in sustaining critical mission-related software and systems to a large government contract.

Key Responsibilities:

  • The Software Engineer develops, maintains, and enhances complex and diverse software systems (e.g., processing-intensive analytics, novel algorithm development, manipulation of extremely large data sets, real-time systems, and business management information systems) based upon documented requirements. Works individually or as part of a team. Reviews and tests software components for adherence to the design requirements and documents test results. Resolves software problem reports. Utilizes software development and software design methodologies appropriate to the development environment. Provides specific input to the software components of system design to include hardware/software trade-offs, software reuse, use of Commercial Off-the-shelf (COTS)/Government Off-the-shelf (GOTS) in place of new development, and requirements analysis and synthesis from system level to individual software components.

Key Requirements:

To be considered for this position you must have the following:

  • Possess an active or rein-statable TS/SCI with Polygraph security clearance.
  • U.S. Citizenship.
  • 14+ years experience as a Software Engineer and a Bachelor’s degree in Computer Science or related.
  • Works well independently as well as on a team. 
  • Strong communication skills. 

Key Skills:

  • Python development
  • AWS ML certificate or Knowledge implementing production scale AI/ML solutions/systems
  • AWS Kubernetes (docker containerization) understanding or Solution Architect Certification
  • Knowledge of AI tools and developing deep learning models
  • Experience w/cloud infrastructure management

Desired Skills:

  • AI tools (ChatGPT, Google GEMINI and GROK).
  • AI Tools and Language Models are Agentic and Generative AI concepts)

Location: Aurora, CO

Salary Range: The salary range for this full-time position is $170,000 to $260,000. Our salary ranges are determined by position, level, skills, professional experience, relevant education and certifications. The range displayed on each job posting reflects the minimum and maximum target salaries for this position across our projects. Within the range, your salary is determined by your individual benefits package selection. Your recruiter can share more about the specific salary range for your preferred position during the hiring process. 

Benefits:

  • Medical, Dental, and Vision Coverage for Employee and Dependents 
  • Up to 25 Days of Paid Time Off
  • Up to 40 hours of PTO Carryover
  • 11 Federal Government Holidays
  • Work From Home Opportunities
  • 401K Company Contribution, Fully Vested Day 1
  • Discretionary, Certification, and Sign-On Bonus Potential 
  • Employee Referral Bonus Program 
  • Annual Professional Development 
  • 100% Premium Covered for Life & Disability Insurances
  • Additional Voluntary Life Insurance Coverage Available 
  • Employee Assistance Program
  • Travel Protection Program
  • Financial Planning Assistance 
  • Bereavement and Jury Duty Leave
  • Monthly Team and Family Events
  • Technology Budget
  • Global Entry
  • Annual Swag Budget

Learn more about GliaCell Technologies: https://gliacelltechnologies.applytojob.com/apply/

To apply for this position, respond to this job posting and attach an updated resume for us to review. 

GliaCell Technologies, LLC is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status.

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