Yannis Kolovos
Backend Developer
Athens, Attica, Greece
Summary
👤
Senior🎓
Top SchoolYannis Kolovos is a seasoned Backend and Performance Engineer with over 20 years of professional experience and 12 years focused on backend engineering, based in Athens, Greece. He designs and delivers scalable, cloud-native SaaS systems using Ruby/Rails, NodeJS/GraphQL, serverless patterns and AWS, with strong expertise in performance optimization, load balancing (Nginx) and distributed messaging. A pragmatic TDD/CI advocate, he pairs RSpec and CircleCI pipelines with infrastructure automation (Ansible/Capistrano) and operational observability (Elasticsearch/Kibana, Grafana, Redis/InfluxDB). Yannis is an active open source contributor and creator of tools like Stackreduce, Reportly, RunLater and Garfield (GraphQL policy authorization), reflecting a knack for shipping developer-facing libraries and integrations such as Stripe and Google Maps APIs. He holds an M.Sc. in Software Engineering from RMIT and blends systems design rigor with hands-on problem solving across databases from PostgreSQL to CouchDB.
12 years of coding experience
B.Sc School Of Economics, Business Administration, B.Sc School Of Economics, Business Administration at Public Institution Of Higher Education Western GreeceM.Sc Master of Computing, Software Engineering, M.Sc Master of Computing, Software Engineering at RMIT University
Stackoverflow
837reputation
871kreached
27answers
3questions
Github Skills (99)
instagram10
mvc10
ruby10
activerecord10
ruby-on-rails10
single-page-application10
instagram-api10
jwk10
api10
rest10
html10
react-admin10
admin10
rails10
graphql10
Programming languages (8)
Github contributions (5)
msroot/msroot
Jun 2021 - Jan 2026
Contributions:7 pushes, 1 branch in 4 years 8 months
msroot/json-logic-js-graphql
Jun 2021 - Dec 2022
json-logic-js support for GraphQL Query keys
Contributions:30 commits, 2 PRs, 24 pushes in 1 year 6 months
graphql-queryjsjson-logic
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