Kalle Väyrynen
Senior Software Developer at Optiscan Group
Oulu, North Ostrobothnia, Finland
Summary
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SeniorKalle Väyrynen is a senior Java backend developer based in Oulu, Finland, with over two decades of hands-on experience and 11 years in sustained professional roles building production-grade systems. He has led and delivered resilient, cloud-native services across finance and IoT domains, specializing in Java (8/11), Spring Boot, messaging and CI/CD while routinely participating in 24/7 on-call support for critical systems. His background spans embedded/mobile beginnings to architecting scalable microservices with Kafka, RabbitMQ, Kubernetes, AWS and a mix of JVM languages (Scala, Kotlin), reflecting strong operational and DevOps fluency. At Pelion and Tietoevry he combined deep protocol and IoT knowledge (LwM2M, CoAP, TLS) with enterprise finance standards (ISO20022), showing an ability to bridge low-level protocols and high-level business requirements. Pragmatic and steady under pressure, he moves between hands-on coding and technical leadership, favoring reliable, auditable solutions over flash.
11 years of coding experience
24 years of employment as a software developer
Finnish, English
Github Skills (6)
mbed8
java7
web-application5
iot5
coap4
lwm2m2
Github contributions (2)
ARMmbed/mbed-webapp-example
Jul 2015 - Feb 2016
Contributions:21 commits, 1 push in 6 months
java-webweb-applicationmbedon-topdevice-server
PelionIoT/java-coap
Dec 2014 - Sep 2018
Contributions:19 commits, 2 PRs, 1 push in 3 years 10 months
java-libraryjava-coaplwm2mmbedjava
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