John Kartupelis
Java Software Developer at onepointsixtwo
Leeds, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolJohn Kartupelis is a Java software developer and data engineer with 11 years of hands-on experience and over a decade building high-performance distributed systems across financial services, IoT and SaaS. He specialises in designing data platforms and ETL pipelines that process hundreds of millions of records daily, with deep expertise in Python, PySpark, AWS and Java APIs. John has driven company-wide reference data transformations using Data Lakehouse patterns (Iceberg/Dremio) and optimised critical SQL and API performance for low-latency financial workflows. He pairs cloud-native architecture and fault-tolerant messaging (protobufs, Docker, CI/CD) with practical mobile and embedded experience from IoT and aviation projects. Equally comfortable founding stealth projects as a consultant or contributing to large enterprise teams, he brings a track record of translating complex business requirements into resilient, production-ready solutions. Based in Leeds, he combines academic rigour (MSc Computer Science) with a pragmatic engineering approach and a taste for side projects shared on his personal GitHub.
11 years of coding experience
13 years of employment as a software developer
Bachelor's degree Political Science and Government, Bachelor's degree Political Science and Government at University of SussexMaster of Science - MS Computer Science, Master of Science - MS Computer Science at University of York
English, French
Github Skills (18)
ssl10
decryption10
wordpress10
java10
android10
cryptography10
openssl10
mobile10
encryption10
crypto9
location9
geodesy8
gis7
cocoapods5
ios5
Programming languages (4)
Github contributions (5)
onepointsixtwo/dagger_viewmodel
Dec 2017 - Sep 2019
Contributions:6 commits, 10 pushes, 1 branch in 1 year 9 months
onepointsixtwo/dagger_viewmodel_processor
Dec 2017 - Sep 2019
The annotations processor for the Dagger ViewModel library
Contributions:2 PRs, 14 pushes, 2 branches in 1 year 9 months
viewmodelannotationsdaggerannotations-processorjava
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