Tomi Karlstedt
Senior Software Developer at Reaktor
Helsinki, Finland
Summary
👤
Senior🎓
Top SchoolTomi Karlstedt is a Senior Software Developer based in Helsinki with eight years of experience building reliable backend systems for telecom and gaming industries. He has hands-on expertise in Java and Scala, MariaDB, Jetty, Hibernate and CI tooling like Jenkins, and has led teams and architectural efforts for CRM and slot-machine backend platforms. At RAY he helped design monitoring, accounting and migration processes for large-scale slot and CRM systems, later shaping the CRM migration for the RAY–Veikkaus merger—experience that blends core engineering with complex data migration and integration work. Comfortable switching between hands-on development and product-facing roles, he previously led a 15+ consultant team and has acted as scrum master and solution manager, showing a pragmatic focus on delivery and cross-team communication. Trained in software engineering (MSc) and with a background in English literature studies, he brings both technical rigor and clear stakeholder communication to long-running, mission-critical systems.
8 years of coding experience
8 years of employment as a software developer
Master of Science in Technology, Software Engineering, Master of Science in Technology, Software Engineering at University of TurkuEnglish Language and Literature, General, English Language and Literature, General at Helsingin yliopisto
Finnish, English, Swedish
Github Skills (15)
security8
java8
spring8
spring-boot7
spring-security5
ytt5
middleware4
python4
validation4
schema-validation3
openapi2
swagger2
validating1
api-blueprint1
api1
Programming languages (6)
Github contributions (5)
Opetushallitus/service-provider
Feb 2023 - Oct 2024
Contributions:1 review, 18 PRs, 25 pushes in 1 year 8 months
Opetushallitus/otuva
Sep 2024 - Mar 2025
Contributions:3 PRs, 107 pushes in 6 months
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