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Stelios C.

Stelios C.

AI & Machine Learning Engineer · Senior

United Kingdom · Rate on request

Professional Overview

Founding AI engineer at a successfully acquired AI startup, with 4 years in leadership. I've built AI agents and fine-tuned transformer models from 0 to production, powering £1.5bn in annual lending at 80% lower cost. I have strong ML fundamentals and 7 years experience deploying models in production.

Experience

Company
MQube
Oct 2023 – Jun 2026
Role title
Direct of AI

AI Expertise

AI & Machine Learning Engineers

Skills

Python PyTorch Azure Reinforcement Learning

Employment Type

Full-time

Description of Responsibilities

  • 3x'd ops capacity by deploying AI underwriting agent, building evals + harness.
  • Fine-tuned open model with RL (GRPO) to offer self-hosted alternative.
  • Owned B2B sales pipeline and brought £200K in ARR.
  • Advised CEO on our AI strategy, did product demos, tech deep dives, whitepapers.
Company
MQube
Oct 2022 – Oct 2023
Role title
Head of Data Science and Research

AI Expertise

AI & Machine Learning Engineers NLP & Prompt Engineering

Skills

Python PyTorch

Employment Type

Full-time

Description of Responsibilities

  • Automated 50% of support volume by deploying a customer-facing agent.
  • Leveraged RAG, guardrails, escalation logic, custom evals and A/B testing.
Company
MQube
Jul 2021 – Oct 2022
Role title
Lead Machine Learning Engineer

AI Expertise

AI & Machine Learning Engineers

Skills

Python PyTorch

Employment Type

Full-time

Description of Responsibilities

  • Productionised fine-tuned BERT / YOLO models in a pipeline of FastAPI services.
  • Used Azure, k8s, Prometheus, CI/CD-embedded testing to deploy in prod.
  • Automating 95% of the ~5k daily document checks at <5s latency.

Education

School
University of Manchester
Sep 2018 – Sep 2019
Degree / Program
Master's Degree

Field of Study: Artificial Intelligence

School
National Technical University of Athens
Sep 2011 – Sep 2017
Degree / Program
Bachelor and Masters (joint)

Field of Study: Electrical Engineering and Computer Science

Areas of Expertise

AI & Machine Learning Engineers

Design, train, and ship production ML models — from data pipelines to model inference at scale. Covers supervised learning, neural networks, LLM integration, and model optimisation.

NLP & Prompt Engineering

Build natural language processing systems, fine-tune large language models, and craft reliable production prompts for AI-powered products.

AI Product & Strategy

Translate AI capabilities into product roadmaps, define success metrics, and drive adoption across engineering and business teams.

Data Science & Analytics

Extract business insights from raw data using statistical modelling, predictive analytics, A/B testing, and interactive dashboards.

Open to

Contract Freelance Full-time Part-time

Skills

Experience Level

Senior

Current location

United Kingdom

Time Zone

London UTC+0

Primary Work Language

English

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