Konstantinos Kafkas
Senior Software Engineer II at Checkout.com
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolKonstantinos Kafkas is a Senior Software Engineer II based in London with a decade-long background in building low-latency, high-throughput backend systems, currently scaling payment infrastructure at Checkout.com. He has driven critical products there including a near-real-time webhook notification platform and an asynchronous payment gateway capable of hundreds of transactions per second, demonstrating deep expertise in payment flows, PCI concerns, and reliable event delivery. Prior roles show practical experience migrating monoliths to microservices and building large-scale domain visualizations for European rail networks, highlighting both system design and product-focused engineering. A first-class Computer Software Engineering graduate, he combines rigorous engineering discipline with a track record of shipping customer-facing systems that balance performance, resilience, and operational simplicity. Notably, his work spans end-to-end payment lifecycles—from tokenization and third-party integrations to analytics—making him a pragmatic specialist in transactional systems.
6 years of coding experience
6 years of employment as a software developer
Bachelor’s Degree, Computer Software Engineering, 1st Class, Bachelor’s Degree, Computer Software Engineering, 1st Class at International Hellenic University
English, Greek
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (38)
checkout10
eve10
api10
stock-data9
docker-engine9
financial-data9
yahoo9
apexcharts9
charts8
yahoo-finance-api8
svg8
interactive8
yahoo-finance8
visualization8
javascript8
Programming languages (6)
Github contributions (5)
konstantinos-kafkas-cko/peekaqueue
Aug 2019 - Aug 2019
Drop-in docker container for monitoring SQS queues
Contributions:6 pushes, 1 branch in 2 days
sinkdrop-inqueuesdockerdocker-container
konstantinos-kafkas-cko/react-apexcharts
Mar 2022 - Mar 2022
📊 React Component for ApexCharts
Contributions:6 pushes in 1 day
react-componentchartsreactapexcharts
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.