AI Engineer - External Consultant (B2B)

Location: Greece (Remote)

Engagement Type: Independent External Consultant – B2B Contract

Mandatory Requirement: Applicants must already have an active, registered sole proprietorship (ατομική επιχείρηση) in Greece and be able to issue invoices for their professional services.

Please note: This is strictly an external consulting opportunity, not a salaried employment position. Applications from candidates who do not already meet the above business registration requirement will not be considered.

About the Role

At AI2CYBER, we are seeking a highly motivated and experienced AI / Reinforcement Learning Software Engineer to collaborate with our engineering team as an independent external consultant based in Greece.

The ideal candidate will have strong expertise in Python, machine learning, reinforcement learning (RL), Large Language Models (LLMs) and the development of intelligent AI-driven systems.

The role focuses on designing and developing advanced reinforcement learning algorithms, integrating LLM capabilities, and building modular AI components and multi-agent systems using technologies such as the MCP.

The selected consultant will contribute to innovative cybersecurity solutions involving intelligent automation, AI-driven decision-making, threat intelligence and adaptive systems.

This opportunity is suitable for an experienced engineer who can combine strong theoretical knowledge with practical software engineering skills to develop, evaluate and deploy reliable AI solutions.

Responsibilities

• Design, develop and optimise reinforcement learning algorithms to address complex, real-world challenges.
• Integrate Large Language Models (LLMs) to enhance agent reasoning, threat intelligence, automated decision-making and human-machine interactions.
• Implement and extend Message Control Protocol (MCP) integrations to connect AI applications with external tools, data sources and services.
• Develop modular AI architectures and support coordination between multiple intelligent agents.
• Prototype innovative AI and reinforcement learning methods and transition successful prototypes into production-ready solutions.
• Collaborate with engineering, data science and product specialists to integrate and deploy machine learning and reinforcement learning models.
• Design and conduct experiments to evaluate model performance, reliability and effectiveness.
• Apply appropriate experimental design, statistical analysis and performance evaluation techniques.
• Develop scalable, maintainable and well-documented Python code.
• Contribute to code reviews, automated testing, debugging and technical documentation.
• Identify and resolve complex software engineering and AI integration challenges.
• Support the deployment, monitoring and continuous improvement of AI-driven applications.
• Consider security, performance and reliability throughout the development lifecycle.
• Handle proprietary technical information with discretion and professional confidentiality.

Requirements

• A Master's or PhD degree in Computer Science, Electrical Engineering, Mathematics, Statistics or a related field, or equivalent practical experience.
• Strong proficiency in Python and experience with widely used machine learning libraries and frameworks.
• Practical experience developing and implementing reinforcement learning algorithms.
• Experience with OpenAI Gym, Gymnasium, or similar reinforcement learning environments.
• Good understanding of machine learning principles, model training, optimisation and evaluation.
• Experience integrating Large Language Models (LLMs) into software applications or AI-driven workflows.
• Understanding of AI agents, multi-agent architectures and agent orchestration concepts.
• Familiarity with Message Control Protocol (MCP) and its use in connecting AI systems with external tools and data sources.
• Knowledge of cybersecurity principles, tools and techniques.
• Experience working with containerised environments, such as Docker.
• Strong analytical, conceptual and problem-solving abilities.
• Ability to write clean, modular, testable and maintainable code.
• Excellent English communication and technical writing skills.
• Ability to work independently, manage technical responsibilities and collaborate effectively with multidisciplinary teams.

Preferred qualifications

• Experience with Kubernetes, Kafka and REST APIs.
• Familiarity with cloud computing platforms such as AWS or Microsoft Azure.
• Experience with DevOps practices and CI/CD pipelines.
• Experience with PyTorch, TensorFlow, Stable-Baselines3, Ray RLlib, or similar machine learning and reinforcement learning frameworks.
• Experience developing LLM-powered agents, tool integrations or multi-agent systems.
• Practical experience implementing MCP servers or clients.
• Experience with distributed computing, asynchronous processing or scalable AI architectures.
• Familiarity with MLOps, experiment tracking, model deployment and monitoring.
• Experience applying AI or reinforcement learning to cybersecurity, threat detection, automated security operations or intelligent decision-support systems.
• Understanding of secure AI development and the security risks associated with LLM-based applications.

Technology Stack

Python, Reinforcement Learning, OpenAI Gym/Gymnasium, PyTorch, TensorFlow, LLMs, Model Context Protocol (MCP), AI Agents, Multi-Agent Systems, Docker, Kubernetes, Kafka, REST APIs, AWS/Azure, Git and CI/CD.

Ideal Consultant Profile

We are looking for more than someone who can train machine learning models.

The ideal consultant understands how to transform advanced AI research concepts into practical, reliable and scalable software solutions.

We value professionals who demonstrate:

• Strong foundations in artificial intelligence, reinforcement learning and software engineering.
• The ability to translate complex problems into effective AI-driven solutions.
• Experience developing production-oriented AI applications rather than exclusively experimental models.
• Independent problem-solving and sound technical judgement.
• Strong analytical thinking and attention to detail.
• A proactive approach to exploring and evaluating new AI technologies.
• Accountability and ownership throughout the development lifecycle.
• An interest in applying advanced AI techniques to real-world cybersecurity challenges.

The consultant will collaborate with experienced technical specialists and contribute to the design and implementation of innovative AI-powered cybersecurity technologies.

What We Offer

• Competitive consulting fees, subject to periodic review.
• Fully remote collaboration from anywhere in Greece.
• Opportunities to contribute to advanced AI, reinforcement learning and cybersecurity projects.
• Involvement in technically challenging projects and the development of innovative software solutions.
• Collaboration with experienced AI, cybersecurity and software engineering professionals.
• Access to relevant technical resources, learning materials and collaboration tools.
• Opportunities for continuous professional development and exposure to emerging technologies.
• A flexible, results-oriented professional environment that values technical expertise, initiative and independent contribution.
• Opportunities for long-term collaboration and involvement in future research and development initiatives.

External Consulting Requirements - Important

This opportunity is exclusively available to independent professionals operating through an existing sole proprietorship in Greece.

To be eligible, applicants must:

• Be currently resident in Greece.
• Already have an active, legally registered sole proprietorship (ατομική επιχείρηση) in Greece at the time of application.
• Be legally able to provide professional software engineering, AI development or related IT consulting services.
• Be able to issue valid invoices for the professional services provided.
• Be available to enter into a B2B consulting agreement with AI2CYBER.

This is not an employee position, and no salaried employment contract will be offered. Establishing a sole proprietorship after selection does not satisfy the eligibility requirements.

The collaboration is intended to be ongoing, with the scope, availability and deliverables agreed under the consulting arrangement.

Confidentiality

The selected consultant will work on proprietary AI technologies, reinforcement learning models, intelligent automation systems and sensitive product logic.

Detailed information about internal projects, technical architectures and development activities will be shared only with shortlisted candidates and, where appropriate, under confidentiality terms.

About AI2CYBER

At AI2CYBER, we are a cybersecurity firm dedicated to developing innovative technologies and providing specialist security solutions to protect businesses and organisations from evolving cyber threats.

Our work combines cybersecurity expertise, artificial intelligence and advanced software engineering to develop intelligent, reliable and practical security solutions.

Our mission is to empower organisations to navigate the complex cybersecurity landscape with confidence.

By combining advanced technologies, continuous improvement and a proactive approach to security, we help our clients identify emerging threats, strengthen their defences and stay ahead of cyber attackers.

We are committed to building a safer digital world and contributing to technological innovation in cybersecurity.

Interested in Collaborating With Us?

If you are an experienced AI / Reinforcement Learning Software Engineer, passionate about artificial intelligence, intelligent agents and advanced cybersecurity technologies, and already operate an active sole proprietorship in Greece, we would be pleased to hear from you.

Please email your CV in English to careers@ai2cyber.com, using "AI Engineer - External Consultant" as the subject line.

Where possible, include a brief summary of relevant AI, reinforcement learning or LLM integration projects, highlighting your specific technical contributions.

Please apply only if you meet the external consulting and business registration requirements outlined above.

All applications will be treated with strict confidentiality.

Requirements

This position in available only for Greek residents.