Freelance Software Developer (Java) - Quality Assurance (AITrainer)

Freelance Software Developer (Java) - Quality Assurance (AI Trainer) 3 days ago – Be among the first 25 applicants

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This opportunity is only for candidates currently residing in the specified country. Your location may affect eligibility and rates. Please submit your resume in English and indicate your level of English proficiency.

At Mindrift, innovation meets opportunity. We believe in using the power of collective intelligence to ethically shape the future of AI.

What We Do The Mindrift platform connects specialists with AI projects from major tech innovators. Our mission is to unlock the potential of Generative AI by tapping into real-world expertise from across the globe.

About The Role GenAI models are improving very quickly, and one of our goals is to make them capable of addressing specialized questions and achieving complex reasoning skills. If you join the platform as an AI Tutor in Coding, you'll have the opportunity to collaborate on these projects.

Responsibilities

Code generation and code review

Prompt evaluation and complex data annotation

Training and evaluation of large language models

Benchmarking and agent-based code execution in sandboxed environments

Working across multiple programming languages

Adapting guidelines for new domains and use cases

Following project-specific rubrics and requirements

Collaborating with project leads, solution engineers, and supply managers on complex or experimental projects

Note:

Flexibility and quick adaptation to new requirements are essential.

How To Get Started Simply apply to this post, qualify, and get the chance to contribute to projects that match your technical skills, on your own schedule. From coding and automation to fine-tuning AI outputs, you'll play a key role in advancing AI capabilities and real-world applications.

Requirements

You hold a Bachelor's or Master's Degree in Computer Science, Software Engineering, Software Development, Computer Engineering, Mobile App Development, Cloud Computing, Data Science, Big Data or other related fields

You have at least 3 years of professional experience in Java 17+, including streams API and concurrent programming

Your level of English is advanced (C1) or above

Hands‑on experience with JUnit 5, TestNG, Mockito, and TestContainers

Proficiency with build tools (Maven, Gradle), IDEs (IntelliJ IDEA), and CI/CD pipelines (Jenkins, GitHub Actions, GitLab CI)

Experience with the Spring ecosystem (Spring Boot, Spring Data, Spring Security), JPA/Hibernate

Strong understanding of JVM internals, garbage collection, performance optimization, and design patterns

Experience with messaging systems (Kafka, RabbitMQ) and microservices architectures

Practical use of AI‑assisted tools for refactoring, performance analysis, and test generation

Familiarity with cloud platforms (AWS, Azure), containers, and Kubernetes

Strong skills in JVM profiling (JProfiler, VisualVM) and debugging

You are ready to learn new methods, able to switch between tasks and topics quickly and sometimes work with challenging, complex guidelines

Our freelance role is fully remote so you just need a laptop, internet connection, time available and enthusiasm to take on a challenge

Benefits

Get paid for your expertise, with rates that can go up to $45/hour depending on your skills, experience, and project needs

Take part in a part‑time, remote, freelance project that fits around your primary professional or academic commitments

Work on advanced AI projects and gain valuable experience that enhances your portfolio

Influence how future AI models understand and communicate in your field of expertise

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