About Jack Kollar | Contra Jack Kollar

Jack Kollar

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Jack Kollar

Software Engineer focused on .NET, C#, Java, Javascript

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Jack is ready for their next project!

Newnan, USA

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Newnan, USA

Meet Jack

AI Software Engineer specializing in .NET, C#, Python, and JavaScript, with full-stack expertise in MERN and Next.js. I build scalable AI-driven applications, APIs, and modern web platforms with a strong focus on performance, clean architecture, and business impact.

Identity verifiedVetted for secure and trusted collaboration.

Rate

$75 - $100/hr

Skills and tools

Software Engineer Fullstack Engineer Backend Engineer Frontend Engineer Dot Net Backend Developer

Details

Newnan, USA

Fluent in English

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For independents

Contra Pro Manage freelance projects Get verified as an expert Find jobs Get discovered Sign contracts Send invoices Commission-free payments Gumroad alternative Lemon Squeezy alternative Polar alternative

For companies

For companies Manage team projects Share hiring workspace Post jobs Discover contractors Sign contracts Approve invoices Global payments & tax compliance

Use Cases

For companies For freelancers For partners For agencies For VCs

Resources

Challenges Partnerships Advertising Creative Human Data Human Creativity Benchmark Creative Arena Project-based hiring calculator Guide to flexible hiring Guide for agencies Creator tools awards Customer stories Blog FAQs for freelancers FAQs for companies Referrals

Hire Freelancers

Explore all Top independents Design Engineering Marketing Music & audio Social media Video & animation Product Business consulting & HR Other

Contact

Contact support

Company

Mission Careers Terms & conditions Privacy policy Cookie policy

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