The article addresses the questions of computer technologies application to assess the characteristics of the competitive environment of industry markets based on modern financial and economic models. The aim of the study is to develop an information system for identifying questionable counterparties that have entered into construction work contracts with state and municipal customers. The structure of the information system based on MongoDB and Neo4j non-relational databases is proposed. An algorithm is developed for collecting, processing and visualizing financial and economic information from open sources. The system includes data analysis methods that provide a calculation of indicators characterizing the financial condition of individual companies, as well as the level of market monopolization in the studied region. Testing the system on the example of the construction market of the Khanty-Mansiysk Autonomous District of Russia showed that it provides: identification of government contracts with unstable companies; assessment of the reliability of counterparties; assessment of the degree of competition in a particular market; identification of affiliated companies. The system can be used to support decision-making in the selection of contractors for construction work.