Valerii Sosliuk
Senior Software Engineer at Star
Ukraine
Summary
🤩
Rockstar🎓
Top SchoolValerii Sosliuk is a Senior Software Engineer with 11 years of professional Java experience focused on telecom and IoT platforms, specializing in backend systems built with Spring, Akka, Spark and messaging via MQTT, RabbitMQ and JMS. He has strong hands-on expertise in building robust integration and testing (JUnit, Mockito, integration tests for MQTT RPC) and improving gateway reliability and security (MQTT SSL, graceful shutdowns) for ThingsBoard’s widely used open-source IoT platform. Comfortable across databases (Oracle, Postgres, Cassandra), cloud (AWS, OpenStack) and Linux environments, Valerii also contributes technical documentation and installation guides, bridging developer experience with operational needs. Former roles from Cisco systems engineering to senior positions at ThingsBoard and GlobalLogic show a steady progression from network-level understanding to scalable backend architecture. He combines deep protocol-level knowledge (MQTT, CoAP, LwM2M) with pragmatic scripting and DevOps skills, often surfacing subtle edge-case fixes in communication flows that improve system resilience.
11 years of coding experience
14 years of employment as a software developer
Igor Sikorsky Kyiv Polytechnic Institute
English, French, German
Stackoverflow
1,038reputation
68kreached
10answers
4questions
Github Skills (26)
ssl10
back-end-development10
mqtt10
java10
mqttnet10
javas10
iot10
gateway10
spring-boot10
documentation10
testing9
netty9
spark9
kafka9
persistence9
Programming languages (4)
Github contributions (5)
thingsboard/thingsboard.github.io
Jan 2017 - Aug 2021
Documentation repository
Role in this project:
Technical Writer
Technical WriterContributions:1 review, 57 commits, 37 PRs in 4 years 7 months
Contributions summary:Valerii primarily contributed to the documentation repository, focusing on updating user guides and installation instructions. The commits include adding MQTT SSL configuration examples, updating Spark Kafka integration tutorials, and providing installation steps for the IoT gateway, all of which indicates a focus on providing clear and up-to-date information. The modifications reflect a commitment to ensuring users have accurate guidance on various aspects of the platform.
thingsboard
thingsboard/thingsboard-gateway
Jan 2018 - Jan 2019
Open-source IoT Gateway - integrates devices connected to legacy and third-party systems with ThingsBoard IoT Platform using Modbus, CAN bus, BACnet, BLE, OPC-UA, MQTT, ODBC and REST protocols
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 releases, 74 commits, 54 PRs in 1 year
Contributions summary:Valerii primarily contributed to the ThingsBoard gateway, enhancing its functionality and robustness. Their work involved adding connection timeouts, implementing MQTT SSL using JKS, and refactoring code related to persistent storage and the MQTT client. They also addressed the MQTT connection process and added graceful shutdown features, ensuring a more stable and reliable gateway. The changes demonstrate a focus on improving core MQTT functionality and stability.
iiotconnectedmqtt-brokerawsiot-platform
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