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As of Jun 5, 2026, the average hourly pay for upwork freelancer in the United States is $34.72, according to ZipRecruiter salary data. Most workers in this role earn between $33.17 and $36.30 per hour, depending on experience, location, and employer.

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To thrive as an Upwork Freelancer, you need expertise in your chosen field, a solid work portfolio, and a clear understanding of client project requirements. Familiarity with Upwork's platform tools, secure payment systems, and communication software is essential. Strong time management, self-motivation, and effective client communication set top freelancers apart. These skills are crucial for building a strong reputation, securing repeat business, and managing multiple projects independently.

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Upwork Freelancers often encounter challenges such as finding consistent clients, managing fluctuating workloads, and standing out in a competitive marketplace. To overcome these, it's important to regularly update your profile and portfolio, promptly respond to client messages, and actively apply to relevant job postings. Building long-term client relationships, setting clear expectations, and seeking client reviews can also lead to more stable and rewarding work. Freelancers who successfully manage their time and rate negotiations often experience greater job satisfaction and career growth on the platform.
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Copy of AI Code Reviewer & Systems Evaluation Engineer 1

Lifted, an Upwork Company™

Springfield, KY • Remote

Full-time

Posted 16 days ago

Job description

Company Description

An enterprise client is currently seeking experienced software engineers to contribute to improving advanced AI systems through human feedback. This work supports leading AI organizations in training large language models to better understand software development practices, debugging, and code quality.

This is part of a cutting-edge initiative focused on enhancing how AI systems write, review, and optimize code in real-world scenarios. You’ll play a key role in shaping how AI models evaluate performance, detect issues, and generate reliable outputs.

Job Description

This opportunity is ideal for engineers who enjoy analyzing systems, improving code quality, and working on complex technical challenges. You will contribute to AI training projects by evaluating outputs, refining logic, and identifying potential vulnerabilities.

What You'll Do:

  • Develop objective, verifiable evaluation criteria (rubrics) for system performance
  • Review system logs and execution paths to improve reliability and code quality
  • Refactor code and optimize system behavior toward ideal outcomes
  • Test systems for vulnerabilities, including data exposure and edge-case failures
  • Provide detailed, high-quality feedback on system performance and outputs
Qualifications

Requirements:

  • 2+ years of experience in backend engineering, AI automation, or systems integration
  • Strong proficiency in at least two programming languages (e.g., Python, JavaScript, Go, Java)
  • Experience working with SQL databases
  • Proven ability to build and maintain production-grade systems
  • Experience working in live (non-mocked) environments with multi-step interactions
  • Strong analytical skills and attention to detail

Nice to Haves:

  • Experience with multi-stage system workflows and coordination tasks
  • Familiarity with integrating tools such as APIs, databases, or external platforms
  • Understanding of system vulnerabilities (e.g., privacy leaks, prompt injection, access escalation)
  • Experience working with AI systems or agent-based workflows
  • Comfort working with persistent state tracking or similar frameworks

Additional Information
  • Fully remote and flexible work schedule
  • Project-based engagement with no guaranteed hours
  • Work on tasks based on availability and project assignment
  • Payment is based on completed tasks only
  • Must accept project invitations before beginning work
  • Freelancers may accept or decline tasks depending on availability
  • No guaranteed workload; volume may vary weekly