Taking on select freelance web projects

Stefan
Mayer.

currentlySoftware engineer at Barclays

I build backend integration systems at Barclays, ship full-stack products on the side, and I'm writing my first research paper on hybrid post-quantum and quantum-key-distribution security.

Book an appointment See my work

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Java✦Python✦TypeScript✦JavaScript✦SQL✦PHP✦HTML✦CSS✦Spring Boot✦Apache Kafka✦Ansible✦Microsoft Azure✦Maven✦JUnit✦Svelte✦Next.js✦Tailwind CSS✦DaisyUI✦Bootstrap✦Pandas✦NumPy✦scikit-learn✦Java✦Python✦TypeScript✦JavaScript✦SQL✦PHP✦HTML✦CSS✦Spring Boot✦Apache Kafka✦Ansible✦Microsoft Azure✦Maven✦JUnit✦Svelte✦Next.js✦Tailwind CSS✦DaisyUI✦Bootstrap✦Pandas✦NumPy✦scikit-learn✦

Selected work · 07

Things I've built

All projects

Featured · AI product · 2025

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.

data points collected: 260k+; data points collected
sentiment accuracy: 90%+; sentiment accuracy
model: BERT; model

SvelteTypeScriptTailwind CSSDaisyUIPythonBERTSQL

Sentire dashboard showing a 30-day sentiment chart and today's top-impact WallStreetBets posts

Client work

Luca Ambrosino

2024

Portfolio site for a local pianist

HTMLCSSBootstrapJavaScript

Machine learning

Kidney Stone Prediction

2023

Kaggle Playground Series S3E12 — binary classification

PythonPandasNumPyscikit-learnCatBoost

Kaggle notebook for Playground Series Season 3 Episode 9, regression with a tabular concrete strength dataset

Machine learning

Concrete Strength Prediction

2023

Kaggle Playground Series S3E9 — regression

PythonPandasscikit-learnRandom Forest

Web

Hot Beans Web

2024

A multi-page website for a web design agency

HTMLCSSTailwind CSSPHP

Experience & education

The journey so far

Full-time developer, part-time student, and always building something on the side.

Full story

Now

WorkingBackend integration engineering at Barclays (GTIS).
StudyingDigital & Technology Solutions at Manchester Metropolitan University.
ResearchingWriting my first paper on hybrid PQC–QKD security algorithms.

What I'm up to

2024 – PresentDegree apprenticeship
Technology Developer Degree Apprentice (BA2)
Barclays UK
Backend developer on an integration team within Group Technology Infrastructure Services.
JavaSpring BootApache KafkaAnsibleMicrosoft Azure
2024 – PresentFreelance
Founder & Web Developer
Mayer Digital
A small web studio helping businesses and creatives build a robust digital footprint, from concept and design through launch and beyond.
HTMLCSSJavaScriptBootstrapTailwind CSSWordPress
2024 – PresentEducation
Digital & Technology Solutions (Software Engineering), BSc degree apprenticeship
Manchester Metropolitan University
Studying for my degree alongside full-time work at Barclays, with a focus on software engineering.
Business SystemsDigital Technology in Organisations and SocietyEnterprise ProgrammingFull Stack Web DevelopmentNetworking & SecurityProject Management
Until 2024Employment
E-commerce & Web Projects
Jewellery industry
Managed e-commerce and web development projects, working across Magento, Azure and WordPress.
MagentoMicrosoft AzureWordPress

Toolkit

Skills, with receipts

No progress bars. Hover any skill to see the projects and roles where I've actually used it.

Languages

Backend & infrastructure

Frontend

Data & AI

Platforms

Practice

Evidence for

Java

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.

Try the QKD lab

Writing