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Freelance Senior C# Developer Jobs (NOW HIRING)

Index Engines

Senior C/C++ Developer

San Jose, CA · On-site +1

$63.75 - $84.25/hr

... senior level Software Engineers for our San Jose, CA office. The ideal candidate will develop ... Strong skills in C and Python * Experience with high-availability systems, clustering, or ...

Index Engines

Senior C/C++ Developer

San Jose, CA · On-site

... senior level Software Engineers for our San Jose, CA office. The ideal candidate will develop ... Strong skills in C and Python * Experience with high-availability systems, clustering, or ...

Index Engines Inc

Senior C/C++ Developer

San Jose, CA · On-site

$150K - $195K/yr

... senior level Software Engineers for our San Jose, CA office. The ideal candidate will develop ... Strong skills in C and Python * Experience with high-availability systems, clustering, or ...

Index Engines Inc

Senior C/C++ Developer

San Jose, CA · On-site +1

$63.75 - $84.25/hr

... senior level Software Engineers for our San Jose, CA office. The ideal candidate will develop ... Strong skills in C and Python * Experience with high-availability systems, clustering, or ...

Deep Systems

$126K - $166K/yr

Senior Software Engineer Requirements: * Capital Markets Experience - understanding of front ... Partner with Lead Developer and Executive Management on various projects. * Manage individual ...

Lockheed Martin

Software Engineer Sr C/C++

Manassas, VA · On-site

$122K - $161K/yr

The Work Lockheed Martin Rotary and Mission Systems is seeking a Software Engineer C/C++ Sr. in ... Azure DevOps) to automatically compile, run unit/integration tests, and deliver builds for C/C ...

Lockheed Martin

Software Engineer Sr C/C++

Manassas, VA

$122K - $161K/yr

The Work Lockheed Martin Rotary and Mission Systems is seeking a Software Engineer C/C++ Sr. in Manassas, VA. In this role you will have the responsibility of: Participate in a crossfunctional team ...

New

Cymertek

C / C++ / Java Software Developer

Chantilly, VA · On-site

$50.75 - $68.25/hr

... Senior Software Developer, Software Architect, etc. DEGREE (Level Desired) Bachelor's Degree DEGREE (Focus) Computer Science, Software Engineering, Computer Engineering, Information Technology ...

Cymertek

C / C++ / Java Software Developer

Reston, VA · On-site

$51 - $68.75/hr

... Senior Software Developer, Software Architect, etc. DEGREE (Level Desired) Bachelor's Degree DEGREE (Focus) Computer Science, Software Engineering, Computer Engineering, Information Technology ...

Cymertek

C / C++ / Java Software Developer

Honolulu, HI · On-site

$48.50 - $65.25/hr

... Senior Software Developer, Software Architect, etc. DEGREE (Level Desired) Bachelor's Degree DEGREE (Focus) Computer Science, Software Engineering, Computer Engineering, Information Technology ...

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As of Aug 13, 2026, the average hourly pay for freelance senior c# developer in the United States is $61.73, according to ZipRecruiter salary data. Most workers in this role earn between $52.40 and $69.23 per hour, depending on experience, location, and employer.
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Infographic showing various Freelance Senior C# Developer job openings in the United States as of August 2026, with employment types broken down into 80% Full Time, 3% Part Time, and 17% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution, with an average salary of $128,400 per year, or $61.7 per hour.

Senior C/C++ Developer

Index Engines

San Jose, CA • On-site, Remote

$63.75 - $84.25/hr

Full-time

Medical, Dental, Vision, Retirement, PTO

Re-posted 27 days ago

Job description

About Index Engines

At Index Engines, we’re all about helping companies bounce back from cyber threats and trust their data again — no matter what hits them.

Our flagship solution, CyberSense, delivers 99.99% accuracy in detecting data corruption, helping organizations recover quickly from ransomware attacks. We partner with awesome industry leaders like Dell Technologies, IBM, Lenovo/Infinidat, and Hitachi Vantara to power AI-driven cyber recovery across both primary and backup storage.

We’re a growing, tech-forward company with a startup feel and an enterprise-level impact. We take our mission seriously — but not ourselves. Expect a team that’s collaborative, curious, and loves solving hard problems together.

The Role

Index Engines has an outstanding career opportunity for mid to senior level Software Engineers for our San Jose, CA office. The ideal candidate will develop, maintain, and support software for the Index Engines’ Linux application and will work closely with the Index Engines’ Support Organization to resolve customer issues.

What You’ll Do

  • Design and build distributed systems that are scalable, reliable, and secure
  • Guide technical discussions and help shape architectural decisions
  • Develop and maintain backend services, APIs, and platform components
  • Collaborate closely with Product, QA, DevOps, and Security teams
  • Enhance system performance, visibility, and resilience
  • Write clear, maintainable, and well-tested code
  • Contribute to code reviews and support the growth of junior engineers
  • Promote strong practices in development, CI/CD, and testing
  • Investigate and resolve production issues to maintain high availability

What You Bring

  • 4–7 years of professional experience in software engineering
  • Strong skills in C and Python
  • Experience with high-availability systems, clustering, or distributed storage/backup solutions
  • Familiarity with Agile or Scrum workflows
  • Hands-on experience with distributed systems and microservices
  • Solid understanding of data structures, algorithms, and system design
  • Experience developing RESTful APIs and backend services
  • Familiarity with cloud platforms such as AWS, Azure, or GCP
  • Strong problem-solving, debugging, and communication skills

We'd Love It If You Have

  • Experience with tools like SVN, Git, Jira, Confluence, or Bitbucket
  • Comfort using GenAI tools (e.g., ChatGPT, Claude) in development workflows
  • Experience administering Linux systems
  • Familiarity with backup technologies and database systems
  • Exposure to VMFS/SCSI development
  • Understanding of communication protocols
  • Basic knowledge of server hardware and networking
  • A Master’s degree in computer science or a related field

Why You'll Love Working Here

At Index Engines, you’ll join a team that’s equal parts smart, supportive, and a little nerdy (in the best way possible). We move fast, collaborate often, and celebrate wins big and small.

You’ll have the freedom to experiment, make decisions, and actually see the impact of your work. We’re proud of what we build — and we like having fun while we do it.

If you’re looking for a place where you can lead with vision, grow with purpose, and work with people who genuinely enjoy what they do, you’ll fit right in.

  • Competitive salary based on experience and qualifications
  • Comprehensive health, dental, and vision benefits
  • 401(k)
  • Opportunities for professional development and certification support
  • Collaborative team environment with a mission-driven culture
  • Unlimited PTO
  • Hybrid work schedule with WFH on Mondays and Fridays in our San Jose, CA location