About Yosef Kevin Yonathan | Contra Yosef Kevin Yonathan

Yosef Kevin Yonathan

Yosef Kevin Yonathan

Ruby on Rails Dev | I Fix Legacy Apps, Cut Infra Costs

Ready for work

Yosef Kevin is ready for their next project!

South Jakarta, Indonesia

South Jakarta, Indonesia

Meet Yosef Kevin

I'm a backend-focused developer with 10+ years of experience in Rails, GraphQL, MySQL, and AWS.
I specialize in fixing legacy apps, optimizing slow APIs, and reducing cloud costs (especially on EC2 + RDS).
I work fast, don't waste time, and deliver clean, production-ready code.
💡 Need someone to upgrade your Rails app, fix N+1 queries, or move off Heroku? I'm your man.

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Rate

$25 - $50/hr

Skills and tools

Web Developer Backend Engineer

Details

South Jakarta, Indonesia

Fluent in English and Indonesian

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

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

Use Cases

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Resources

Partner networks Advertising Hackathons Creative Human Data Human Creativity Benchmark Human in the loop API Project-based hiring calculator Guide to flexible hiring Guide for agencies Creator tools awards Customer stories Blog FAQs for freelancers FAQs for companies Referrals

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

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