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Freelance Software Engineer Startup Jobs in Colorado

Infleqtion

Software Engineer

Louisville, CO · On-site

$100/hr

As a deep-tech startup, we embrace a results-driven, fast-paced, and customer-focused approach to innovation. We are seeking a Software Engineer with deep expertise in Rust and familiarity with ...

Infleqtion

Software Engineer

Louisville, CO · On-site

$100/hr

As a deep-tech startup, we embrace a results-driven, fast-paced, and customer-focused approach to innovation. We are seeking a Software Engineer with deep expertise in Rust and familiarity with ...

Infleqtion

Software Engineer

Louisville, CO · On-site

$100/hr

As a deep-tech startup, we embrace a results-driven, fast-paced, and customer-focused approach to innovation. We are seeking a Software Engineer with deep expertise in Rust and familiarity with ...

ITW Avery Weigh-Tronix

Embedded Software Engineer

CO

$135K - $178K/yr

Objective of role: The Embedded Software Engineer is responsible for the design, development ... to startup behavior, communication failures, timing issues, memory, and interaction between ...

Atom Computing

Senior Software Engineer

Boulder, CO

$140K - $185K/yr

Atom Computing is looking for a Senior Software Engineer to build the software platform that ... Experience working at both a large technology company and a startup. Atom Computing provides a wide ...

Atom Computing

Principal Software Engineer

Boulder, CO

$180K - $220K/yr

We are seeking a Principal Software Engineer to provide technical leadership for the software ... Experience working at both a large technology company and a startup. Atom Computing provides a wide ...

Atom Computing

Principal Software Engineer

Boulder, CO · On-site

$180K - $220K/yr

We are seeking a Principal Software Engineer to provide technical leadership for the software ... Experience working at both a large technology company and a startup. Atom Computing provides a wide ...

Atom Computing

Senior Software Engineer

Boulder, CO · On-site

$140K - $185K/yr

Atom Computing is looking for a Senior Software Engineer to build the software platform that ... Experience working at both a large technology company and a startup. Atom Computing provides a wide ...

Fortive

Staff Software Engineer

Denver, CO

We are looking for an experienced Tech Lead (Staff Software Engineer) to lead a high-impact ... We are a global industrial technology innovator with a startup spirit. Our forward-looking ...

Lunar Outpost

Senior Core Software Engineer

Arvada, CO · On-site

$125K - $165K/yr

We are currently seeking a Senior Core Software Engineer to contribute to our mission in a dynamic startup environment. The main responsibility of the Senior Core Software Engineer is to act as a ...

Lunar Outpost

Senior Core Software Engineer

Arvada, CO · On-site

$125K - $165K/yr

We are currently seeking a Senior Core Software Engineer to contribute to our mission in a dynamic startup environment. The main responsibility of the Senior Core Software Engineer is to act as a ...

Project Canary

Staff Software Engineer

Denver, CO · On-site

$180K - $220K/yr

Staff Software Engineer Department: Technology Employment Type: Full Time Location: Denver ... Startup Adaptability We are a mid-stage startup. Priorities evolve. Documentation is not always ...

Lunar Outpost

Senior Core Software Engineer

Arvada, CO · On-site

$125K - $165K/yr

We are currently seeking a Senior Core Software Engineer to contribute to our mission in a dynamic startup environment. The main responsibility of the Senior Core Software Engineer is to act as a ...

Trace3

Software Engineer II

Colorado Springs, CO · On-site

$96K - $131K/yr

Our culture at Trace3 embodies the spirit of a startup with the advantage of a scalable business ... The Software Engineer II will design, develop and maintain mission-critical software in support of ...

Infleqtion

Sr Software Engineer

Boulder, CO · On-site

$106K - $145K/yr

At Infleqtion we embrace a startup mentality driven by results, urgency, and customer-focused ... We are seeking a Senior Software Engineer to join the team building the control system software for ...

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Freelance Software Engineer Startup information

What are the key skills and qualifications needed to thrive as a Freelance Software Engineer at a startup, and why are they important?

To thrive as a Freelance Software Engineer at a startup, you need strong programming skills, experience with software development lifecycles, and a portfolio demonstrating previous project success, often backed by a relevant degree or certifications. Familiarity with version control systems like Git, cloud platforms (e.g., AWS, Azure), and agile project management tools is common. Outstanding problem-solving abilities, self-motivation, and effective communication set top freelancers apart in this dynamic environment. These skills and qualities ensure you can deliver high-quality solutions, adapt quickly to changing requirements, and collaborate successfully with lean startup teams.

What are some common challenges freelance software engineers face when working with startups, and how can they overcome them?

Freelance software engineers working with startups often encounter challenges such as rapidly changing project requirements, tight deadlines, and limited resources. Startups may pivot their business models, requiring engineers to adapt quickly and learn new technologies or frameworks on the fly. To overcome these challenges, it’s important to maintain clear and regular communication with stakeholders, set realistic expectations, and use agile methodologies to manage changing priorities. Building a strong professional network can also provide support and collaboration opportunities when navigating the fast-paced startup environment.

What is the difference between Freelance Software Engineer Startup vs Freelance Software Developer Agency?

AspectFreelance Software Engineer StartupFreelance Software Developer Agency
CredentialsTypically requires coding skills, portfolio, sometimes certificationsSimilar credentials, often with additional project management experience
Work EnvironmentIndependent, project-based, flexible hoursCollaborative, often part of a team or agency structure
Employer & Industry UsageClients range from startups to small businesses; used in tech and software sectorsClients include larger companies and agencies; used across various industries
Search & Comparison IntentLooking for freelance startup projects or flexible software rolesComparing freelance options with agency-based work

Both roles involve independent software development, but Freelance Software Engineer Startup focuses on individual projects for startups, offering flexibility and direct client interaction. Freelance Software Developer Agency typically involves working with an agency that manages multiple clients, providing a broader range of projects and team collaboration.

What is a Freelance Software Engineer at a Startup?

A Freelance Software Engineer at a startup is an independent contractor who develops, tests, and maintains software solutions for new or growing companies. Unlike full-time employees, freelancers work on a project or hourly basis and may support multiple startups simultaneously. Their work often involves building prototypes, scaling products, or implementing new features quickly to meet the fast-paced needs of startups. Freelancers bring specialized expertise and flexibility, which can be vital for startups looking to innovate and adapt rapidly.
What are the most commonly searched types of Software Engineer Startup jobs in Colorado? The most popular types of Software Engineer Startup jobs in Colorado are:
What are popular job titles related to Freelance Software Engineer Startup jobs in Colorado? For Freelance Software Engineer Startup jobs in Colorado, the most frequently searched job titles are:
What job categories do people searching Freelance Software Engineer Startup jobs in Colorado look for? The top searched job categories for Freelance Software Engineer Startup jobs in Colorado are:
Freelance Software Engineer Startup jobs near you

Software Engineer

Infleqtion

Louisville, CO • On-site

$100/hr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 10 days ago

Job description

Description
Infleqtion is on a mission to commercialize atom-based quantum technologies that deliver orders-of-magnitude improvements in sensing and computing applications. As a deep-tech startup, we embrace a results-driven, fast-paced, and customer-focused approach to innovation.
We are seeking a Software Engineer with deep expertise in Rust and familiarity with embedded systems development to join our cross-functional engineering team. In this role, you'll work across the stack-from low-level embedded Rust and gateware integration to higher-level Rust application interfaces, with exposure to frontend technologies. You'll collaborate closely with hardware, firmware, and application teams to build reliable, high-performance systems.
While a physics background is not required, experience working with physical systems or scientific instrumentation is beneficial. The ideal candidate is fundamentally a software engineer, with strong embedded systems intuition and a commitment to continually deepening their technical expertise.
Job Responsibilities
The duties and responsibilities listed below describe the essential functions of the role. Actual responsibilities may vary based on business needs and may change or expand over time.
  • Collaborate closely with cross-functional teams-including hardware engineers, physicists, and software developers-to deliver fully integrated product solutions.
  • Maintain documentation of designs, workflows, and processes in compliance with internal and regulatory standards.
  • Contribute to integrating Rust-based middleware and driver software used for device control.
  • Collaborate with hardware and FPGA teams to develop software drivers and interfaces for embedded devices.
  • Develop and maintain system-level APIs and communication layers
  • Contribute to frontend development where needed to support tooling, visualization, or user interfaces
  • Write clean, well-tested, and well-documented code
  • Participate in code reviews and technical design discussions

Requirements
Qualifications: Education & Experience
  • Bachelor's degree in computer science, Electrical or Computer Engineering, or a related technical discipline (or equivalent practical experience)
  • Minimum of 5 years of industry experience in Rust Development
  • Exposure to embedded software development using Rust and/or C++.
  • Working knowledge of gateware development and hardware/software integration (e.g., FPGA-based systems)
  • Exposure to frontend development (e.g., JavaScript/TypeScript, React, or similar frameworks).
  • Strong background in developing and debugging embedded Linux environments.
  • Familiarity with embedded and system-level communication interfaces (SPI, I²C, UART, PCIe, Ethernet, etc.)
  • Solid understanding of systems programming concepts (memory safety, concurrency, performance)

Nice to Have
  • Background in high-reliability or performance-critical systems
  • Knowledge of WebAssembly (WASM) and Rust-based frontend frameworks
  • Familiarity with real-time operating systems (RTOS) and bare-metal development.
  • Demonstrated experience in architecting embedded control systems and integrating them into hardware platforms.

We highly value
  • Excellent verbal and written communication skills, with the ability to effectively share information with both technical and non-technical audiences
  • Strong collaboration and engagement skills, with a sense of ownership, pride in your work, and a constant drive for success
  • A strong sense of urgency and responsibility, paired with attention to detail where it matters most
  • An open communication style and a positive, professional attitude reflected in daily work habits
  • Strong problem-solving skills and the ability to learn quickly in new domains
  • The ability to work with a high degree of autonomy-taking high-level goals and defining, resourcing, and executing an effective plan-while also collaborating closely and incorporating feedback from teammates as needed

Benefits
  • Salary range: $106,000 to $145,000
  • 100% company-paid medical, dental, vision, short/long-term disability
  • Employer-funded Health Savings Account
  • Unlimited PTO
  • 401(k) match
  • Company-paid Life and AD&D Insurance
  • Flexible Savings Account
  • Paid FMLA, Maternity/Paternity Leave
  • Employee Assistance Program
  • Student Loan Repayment
  • Equity Program

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