Software Engineer, C

12 hours ago

Thessaloniki, Central Macedonia, Greece Alignerr Full time

 is a community of subject matter experts from several disciplines who align AI models by creating high-quality data in their field of expertise to build the future of Generative AI. Alignerr is operated by Labelbox. Labelbox is the leading data-centric AI platform for building intelligent applications. Teams looking to capitalize on the latest advances in generative AI and LLMs use the Labelbox platform to inject these systems with the right degree of human supervision and automation. Whether they are building AI products by using LLMs that require human fine-tuning, or applying AI to reduce the time associated with manually-intensive tasks like data labeling or finding business insights, Labelbox enables teams to do so effectively and quickly.

Current Labelbox customers are transforming industries within insurance, retail, manufacturing/robotics, healthcare, and beyond. Our platform is used by Fortune 500 enterprises including Walmart, Procter & Gamble, Genentech, and Adobe, as well as hundreds of leading AI teams. We are backed by leading investors including SoftBank, Andreessen Horowitz, B Capital, Gradient Ventures (Google's AI-focused fund), Databricks Ventures, Snowpoint Ventures and Kleiner Perkins.


About the Role

Shape the future of AI — with C As an AI Tutor - C, you'll play a vital role in training and evaluating AI models to ensure they generate accurate, relevant, and high-quality information. You'll use your C expertise to assess code, solve real-world programming challenges, and help AI systems become better problem-solvers. This is a unique opportunity to grow professionally in the AI space while deepening your mastery of C.

Your Day to Day
  • Review and evaluate AI-generated C code for correctness, efficiency, and clarity.
  • Write high-quality C solutions to programming problems, including systems-level tasks.
  • Create clear, human-readable explanations for code logic and problem-solving strategies.
  • Identify and flag edge cases or ambiguities in problem statements or AI responses.
About You
  • Fluent in English, with strong written communication skills and the ability to clearly explain abstract coding concepts.
  • Expertise in C: Strong understanding of pointers, memory management, data structures, and low-level system operations.
  • 3-5 years of experience with C in embedded systems, operating systems, or performance-critical applications is a plus.
  • Bachelor's degree (or pursuing one) in Computer Science or a related field. Master's or PhD preferred, but not required.
  • Curious and passionate about AI, machine learning, and the future of intelligent systems.


Alignerr strives to ensure pay parity across the organization and discuss compensation transparently. The expected hourly rate range for United States-based candidatesis below. Exact compensation varies based on a variety of factors, including skills and competencies, experience, and geographical location.


Pay Range (rate per hour)
$15—$150 USD

Important Information

This is a freelance position compensated on an hourly basis. Please note that this is not an internship opportunity. Candidates must be authorized to work in their country of residence, and we do not offer sponsorship for this 1099 contract role. International students on a valid visa may be eligible to apply; however, specific circumstances should be discussed with a tax or immigration advisor. We are unable to provide employment documentation at this time. Compensation rates may vary for non-US locations.

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