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@laertistsekos
Senior backend engineer specializing in Java, Spring, and SQL optimization.
GreeceI am a Senior Backend Engineer with 10 years designing high-availability, transaction-heavy systems for transportation, fintech, and enterprise clients.
I deliver measurable performance improvements, notably reducing trip-search latency from 75s to 2s and pioneering a dynamic seat-reuse system for real-time bookings.
My core expertise is Java (6/8/11/17), Spring Boot, SQL optimization and microservices, with cross-experience in C#/.NET, Angular and enterprise integration platforms like FileNet.
I focus on reliability, throughput and developer productivity—building reconciliation, payment integration and GDPR-compliant systems while improving operational visibility with reporting and observability tools.
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Work history, roles, and key accomplishments
AMCO
Jun 2020 - Present (5 years 5 months)
Redesigned database schemas and refactored Java services to reduce trip-search latency from 75s to 2s; delivered high-reliability ticketing modules and a dynamic seat-reuse feature to improve utilization and throughput.
LG CNS
Jun 2019 - Jun 2020 (1 year)
Developed a reliable WPF desktop app for real-time NFC card history and status used by Athens Metro staff and contributed to secure card and ticket issuing system integrations.
IKnowHow S.A.
Jun 2018 - Jun 2019 (1 year)
Built a full-stack Spring Boot + Angular enterprise process management platform and extended IBM FileNet P8 with custom Java plugins and integrations.
EYContributed to C-Star credit-risk reporting and INSEIT cybersecurity platforms, and helped build a GDPR compliance tool for clients, delivering backend components and UI integrations.
EYImplemented INSIS integrations for the insurance sector, developed server-side Java handlers, managed Oracle WebLogic deployments, and authored Groovy SoapUI scripts for batch validation.
Private Project
Built a Java-based automated trading bot with MySQL backend running on Raspberry Pi that used statistical correlations to rebalance portfolios and produced significant returns over 18+ months.
Degrees, certifications, and relevant coursework
UPBachelor of Science, Computer Science
2011 - 2015
Completed a Bachelor of Science in Computer Science covering core computing topics and practical software development.
UPBachelor of Science, Mathematics, Statistics & Operational Research
2003 - 2011
Completed a Bachelor of Science in Mathematics, Statistics, and Operational Research with a focus on quantitative analysis.
Software and tools used professionally
GreeceYou can contact Laertis and 90k+ other talented remote workers on Himalayas.
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