Carbon credits marketplace and decentralized crypto exchange for tokenized carbon credits (mobile and web applications, backend with microservice architecture, smart-contracts on blockchain, integration with thirdparty services). Mobile banking, financial data aggregation and management (mobile application, backend with microservice architecture, integration with banking service providers). - Designed and developed complete backend solution for decentralized crypto exchange (DEX) using serverless cloud technologies. - Moved backend from on-premise environment to cloud. It drastically reduced support cost and improved development speed. - Developed and improved multiple EVM and Zilliqa smart-contracts for fungible tokens (ERC-20, ERC- 677, ZRC-2), NFTs (ERC-721) and DEX (Gnosis Protocol). - Integrated multiple banking service providers (Finleap, Tink, SaltEdge, Token.io). - Developed chat-bot for KYC process using Azure Bot Service.

Cryptocurrency exchange (mobile application, backend with microservice architecture, hundreds of microservices, integration with various blockchains, custom blockchain services). - Designed and developed many blockchain integrations (Zcash, EOS, Ripple, Steem, NEM), using bestfitting technologies depending on blockchain origin. - Designed and developed a set of tools and services for fast launching ICO campaigns. - Maintained a couple of ICO campaigns (VLD, SMARC). - Coded Ethereum token smart contracts for the SmartContainers ICO campaign (SMARC).

Marketing survey construction tool (large SPA with rich data context on client, export to IBM SPSS Data Collection). - Designed and developed many modules for various questionnaire item types (questions, choice lists and etc.), and relations between items. - Extended export to the IBM SPSS Data Collection with a lot of new entities and data.

Decision-making system for executive board (multitier SPA, integration with third-party services). - Developed an integration with customer document flow system using WSDL/SOAP via WCF. - Prepared source code for the state security certification.

Sales department automation system, internal document flow system (multitier SPAs, integration with thirdparty services, business-processes automation). - Designed and developed the automation system for sales department - the most valuable company subdivision. - Automated many internal business processes - departments intercommunication and service units activities using custom workflow engine. - Extended workflow engine with mechanism for exchanging data via RabbitMQ.

Accounting systems, ERP/CRM systems, back and front-office systems (multitier desktop applications, application servers, report systems). - Designed and developed the bestseller - restaurant front-office system. - Long time was a maintainer of the primary framework - a set of libraries and tools for developing ERP/CRM/MRP systems. - Started migration of existing desktop solutions to web technologies.