I am results-oriented software developer with above 20 years experience of developing,testing and maintaining various software applications.Always ready to learn some new ways to accomplish a goal.Last 10 years I had strong Java, Python, JS and SQL programming experience. Now I am working with an IoT solutions platform that is based on the DSA (Distributed Services Architecture) communication protocol. My role at the developers team is developing some kind of services named “dslinks” to connect various data sources (metering equipment, external API, various databases or other dslinks). For example, for DSA, I implemented the Mbus communication protocol, which is used mainly in European heat meters. I have created database structures for Main and Edge databases, based at PostgreSQL timescale solution and the service to pump them all to the main database server. The normal load on each edge server is about 1.5~2.0M records per day. Besides that, I have created the backend solutions for the smart home and dispatcher apps, the custom registration plugin for a Keycloak identity tool, the service to getting info from the customer's account ledger app, the DSA wrapper for Recurly app (a famous USA subscription management system). I have improved the DSA wrapper for Advantech Web app (for the Japanese customers), alarming DSA app and others.And earlier I have worked with a complex logistic business project that services the big FMCG warehouse with address-based technology of cargo handling. My role in the project was supporting this project and extending usability and functionality of production modules. I have some experience with connecting industrial equipment to the software system such as the digital video recorders, industrial floor scales, communication protocols converters and radio-frequency mobile scanners.Also I have designed and developed commercial software solutions for real estate business that were installed and implemented at more than 10 real estate companies, which had from 10 to 250 employees. I developed a web service for real estate business solutions. I implemented Spring and Hibernate at the backend and Angular and Bootstrap for the frontend. I am the copyright owner of this product for real estate agents. As well I have created some simple web-services in Python included the service for exchanging data with logistic cloud platform and WMS, the service that read floor scales data, analytic reports service and a service to multithreaded upload data from some databases to AWS instances (PostgreSQL).