B2B project in the field of hiring.Technology stack:- React- TypeScript- NodeJS- Firebase- Google Cloud• Proposed and wrote a new server architecture, formed a document with rules to make development more predictable and faster. Before that, there was an unordered set of code.• Implemented a multi-tenant architecture on the backend, which greatly accelerated the response from the database.• Analyzed and improved the document indexing algorithm in Firestore. The solution accelerated the indexing process by more than 1000 times. In addition, bugs related to the timeout of the connection to the database have disappeared forever.• CV parser. Designed and developed a key feature for HR work using AI.• Document parser. Designed and developed a feature that made it possible to collect information from uploaded user documents completely automatically, and these documents can have any format.• Made a feature that allows you to collect information about the achievements of the developer in a few clicks for further presentation to a potential employer.• Performed a service reserch and integrated functionality into the project that allows you to sign documents with a digital signature.• Designed and developed a feature that makes up a beautiful description of a working showcase using AI.• Monitored payment services and integrated them into the project, which allowed accepting payments of all types from platform users.• Proposed and implemented the coverage of the server part of the project with unit tests, which made it possible to identify broken code at the deployment stage.• Implemented AI-search - by meaning (similarity search), to select a relevant answer without using keywords.

A social project for mutual assistance and search for people.Technology stack:- TypeScript- React.js- Nests- MongoDBResult:• Developed and implemented the backend structure on Express.JS• Wrote Swagger documentation for the backend.• Implemented a multi-layer architecture on the server.• Implemented Unit tests, which reduced the time for manual verification. Bugs are found before production.• Added the launch of the linter in CI. Increased the consistency of the code-style of the project, which reduced the code-review time.• Optimized E2E tests. Accelerated the passage of CI/CD by 30%.• Migrated the server part of the project from Express to Nest.JS• Implemented key functionality on the frontend (registration, authorization, roles).• Was engaged in the development of the personal account module - the point of aggregation of information from all business modules. Its appearance instantly became desirable for all our customers and increased the maturity of the platform.