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Stefan Mayer

Technology Developer Degree Apprentice at Barclays

  • stefanmayer@stefanmayer.co.uk
  • stefanmayer.co.uk
  • linkedin.com/in/stefan-mayer-3a3260251
  • github.com/stefanmayer06
  • stefanjake.substack.com
  • United Kingdom

Profile

I'm an ambitious software engineer and computer scientist who is always eager to learn and innovate. Right now I'm a Technology Developer Degree Apprentice at Barclays UK , working as a backend developer on an integration team in Group Technology Infrastructure Services. Java, Spring Boot, Apache Kafka and Ansible are my daily tools.

Experience

Technology Developer Degree Apprentice (BA2) · Barclays UK

2024 – Present

Backend developer on an integration team within Group Technology Infrastructure Services.

  • Building and supporting backend integration services with Java and Spring Boot
  • Working with event streaming on Apache Kafka and automation with Ansible
  • Rotating through projects and learning opportunities across the bank, including Microsoft Azure

Java · Spring Boot · Apache Kafka · Ansible · Microsoft Azure

Founder & Web Developer · Mayer Digital

2024 – Present

A small web studio helping businesses and creatives build a robust digital footprint, from concept and design through launch and beyond.

  • Designed and built a portfolio site for pianist Luca Ambrosino with YouTube and Bandcamp embeds
  • Tailored websites that reflect each client's brand, with hands-on support from concept to launch

HTML · CSS · JavaScript · Bootstrap · Tailwind CSS · WordPress

E-commerce & Web Projects · Jewellery industry

Until 2024

Managed e-commerce and web development projects, working across Magento, Azure and WordPress.

Magento · Microsoft Azure · WordPress

Selected projects

Sentire · Reddit sentiment analysis for smarter trading

Real-time sentiment analysis of r/WallStreetBets posts and comments. A BERT model scores the community's mood and a live dashboard tracks how it moves with the market.

Svelte · TypeScript · Tailwind CSS · DaisyUI · Python · BERT · stefanmayer.co.uk/projects/sentire

Luca Ambrosino · Portfolio site for a local pianist

Created for a local musician to show potential clients his portfolio through a combination of YouTube links and Bandcamp embeds.

HTML · CSS · Bootstrap · JavaScript · stefanmayer.co.uk/projects/luca-ambrosino-portfolio

Kidney Stone Prediction · Kaggle Playground Series S3E12 — binary classification

End-to-end ML pipeline predicting kidney stones from urine physiology, using feature engineering and a CatBoost ensemble validated with stratified k-fold.

Python · Pandas · NumPy · scikit-learn · CatBoost · XGBoost · stefanmayer.co.uk/projects/kidney-stone-prediction

Concrete Strength Prediction · Kaggle Playground Series S3E9 — regression

A Random Forest model that predicts the strength of a concrete mix from its ingredients: the kind of model construction teams use for quality control.

Python · Pandas · scikit-learn · Random Forest · stefanmayer.co.uk/projects/concrete-strength-prediction

Research

Hybrid PQC–QKD security algorithms (First paper in progress · 2026). Researching hybrid schemes that combine post-quantum cryptography with quantum key distribution, so that communication stays secure even if one of the two layers is broken.