Stephen Leonard
Lead Software Engineer VP at JPMorgan Chase & Co.
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolStephen Leonard is a seasoned software engineering leader with 20+ years building resilient systems for financial services, currently serving as Lead Software Engineer (VP) at JPMorgan in London. He specialises in applied AI engineering—designing LLM‑powered, auditable retrieval and SQL‑generation layers that integrate with enterprise auth and regulated data warehouses. His background spans risk platforms, distributed services, and cloud migrations across Swiss Re, Credit Suisse, Morgan Stanley and JPMorgan, where he has routinely cut runtime from hours to minutes and scaled Kafka throughput by orders of magnitude. He pairs deep backend engineering (Java, Python, cloud, Parquet streaming) with financial-domain intuition and security-aware certifications (FRM, multiple AWS specialties). An early adopter and advocate of AI-assisted development, he codifies prompt libraries and guardrails that make AI tooling safe and productive across teams. Dual UK/Irish citizen, he’s seeking roles where LLM integration and AI platforms are central to delivering regulated, production-ready systems.
10 years of coding experience
21 years of employment as a software developer
BSc Physics, BSc Physics at The University of EdinburghMSc (Part-time) Businesss Systems Analysis & Design, MSc (Part-time) Businesss Systems Analysis & Design at City St George’s, University of London
English, German, French, Spanish
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (28)
file-format9
social-network-analysis9
scrape8
java8
nntp8
network-analysis8
unison8
scraper7
copying6
api6
webscraping6
python6
database5
plugin5
stock4
Programming languages (6)
Github contributions (5)
leonarduk/freemindsearchplugin
Apr 2016 - Mar 2023
This plugin for FreeMind lets you search multiple maps for chosen key words.
Contributions:1 release, 8 PRs, 13 pushes in 6 years 11 months
freemindpluginwordschosenkey-words
leonarduk/medium-lambda-web-scraper-demo
Sep 2022 - Jun 2024
Project code to support an article written on Medium.com
Contributions:3 reviews, 24 PRs, 41 pushes in 1 year 9 months
cheeriocode-projectmedium-commedium
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