Development of enterprise systems and services for warehouse process automation:● Developing MFS (Material Flow System) for routing transport units on a conveyor according to transport orders (Java, PostgreSQL, gRPC)- Participated in the architectural design of the project in a team- Implemented logic for route building (including route rebuilding in exceptional cases)- Developed subsystem for configuring routing rules- Implemented handling of requests from the low level conveyor system- Developed service for integration with the warehouse management system● Optimizing processes for parcel sorting service by providing recommendations to operators and automatic creation of sorting orders for moving parcels (Java, PostgreSQL)- Conducted architectural planning, task decomposition and technical implementation- Assisted in testing, enhanced sorter emulator for easier testing, and handed over the system to the support team- Implemented dashboards for tracking missort causes● Automating the process of measuring goods (Kotlin, MS SQL)- Developed key handlers for the measurement orders flow, container movement to the measuring station- Integrated with measurement machines to obtain dimensional and weight characteristics- Implemented logic for selecting goods for measurement, receiving task assignments, and managing dimensional and weight characteristics● Developing order processing by waves (Java, MS SQL)- Implemented manual reservation of goods for orders, withdrawals- Implemented picking goods in containers and creating transport orders for them- Fixed race conditions for simultaneous wave reservations

Development of enterprise geographic information system for creating world map (named Fiji):● Developing distributed service serving vector tiles (Java, PostgreSQL)- Implemented fast tiles pre-generation at arbitrary sized geometry regions- Rewrote from scratch tiles updating service (processing only geoobject changes that affect tiles data, using multiple workers to process changes according to its priorities)- Optimized tile storage- Implemented smart re-generation of existing tiles● Developing vector map rendering subsystem for WPF client from scratch (C#, GDI+, DirectX, WPF)- Implemented vector tile map rendering (layered rendering, double buffering, tile loading and rendering in multiple threads)- Implemented lock-free vector tile loading from server- Implemented capability to switch between GDI+ and DirectX renderers● Developing service that computes bindings of geoobjects to territorial division units (C#, Asp.Net Core, Java)- Optimized geometry intersection testing operation using quadtrees and prepared geometries for fast batch intersection testing- Developed several times faster algorithm for binding geoobjects to territorial division units with data parallelism- Developed .Net Core worker service for computing and updating bindings for large amount of existing geoobjects● Implementing metadata caching using memcached● Implementing client and server business logic (C#, Java)- Implemented data searching with complex conditions (ElasticSearch)- Created and optimized queries to databases (Sql Server, PostgreSQL)- Implemented validation checks of road graph stored in Neo4J database- Developed complex UI using WPFThere are some articles about product Fiji in the blog of ex-colleague:http://smartpuffin.com/gis-system-our-requirements/http://smartpuffin.com/gis-system-architecture/http://smartpuffin.com/gis-system-map-navigation/http://smartpuffin.com/gis-system-graph-validation/

Development of tool for creating reports - ActiveReports:• Developed algorithms for rendering base report elements in new layout engine (containers with dynamic and static element layout, table-like structures), implementing them in functional style using C#• Developed rendering extension for report export from internal representation to Excel format (C#)• Optimized performance and memory usage of legacy library for export to Excel (C#)