Lefteris Katiforis
Software Engineering Lead at Upstream
Athens Metropolitan Area Greece
Summary
👤
Senior🎓
Top SchoolLefteris Katiforis is a Software Engineering Lead with 11 years of hands-on experience designing and operating high-throughput Java backends, currently leading Upstream’s backend products and systems that handle 70M+ daily requests with sub-20ms latency. He blends deep Java/Spring expertise, concurrency and performance optimization with practical architecture work—collaborating with architects, driving cost and throughput improvements, and owning production stability and releases. A committed mentor and recruiter, he scales team capability through coaching, interview evaluation and process improvements while still contributing to low-level design and critical performance fixes. His career spans building core profiling and fraud-prevention platforms, reactive API orchestrators and full-stack features earlier on, reflecting a pragmatic focus on low-latency, highly available systems. Notably, he pairs relentless attention to design patterns and TDD with a track record of squeezing infrastructure costs through targeted performance tuning.
11 years of coding experience
8 years of employment as a software developer
Bachelor's degree Informatics, Bachelor's degree Informatics at Technologiko Ekpaideutiko Idrima, Athinas
English, Greek
Stackoverflow
6,087reputation
312kreached
212answers
9questions
spring-boot
top-5%
reactive-programming
top-5%
spring
top-5%
java
top-5%
spring-webflux
top-1%
Github Skills (77)
opensearch10
spring-security10
persistence10
elasticsearch10
jpa10
search-engine10
java10
hibernate10
spring-boot10
gradle10
spring10
spring-webflux10
restful10
springframework10
relational9
Programming languages (1)
Github contributions (5)
Leuteris/word-counter
Jun 2019 - Oct 2020
Contributions:37 PRs, 71 pushes, 25 branches in 1 year 4 months
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