Dmitriy Bulanov Email & Phone Number

Limassol, Cyprus

Cyprus

Work on the development of a payment system for the company's customers.- Lead the development of a card payment system. Secured the delivery of main features: account creations, authorizations, settlements, security, backups etc.- Designed and developed messaging communication between high-loaded services (~1-10M messages/day 100K users).- Lead the process of implementing tracing and monitoring, which allowed to optimize services weak points and raise fault tolerance about 40%- Proposed and carried out the transfer of critical part of the services to gRPC.- Design system architecture and plan its follow-up code migration to reduce build time and increase development speed.- Developed parts of FPS and SEPA transfer logic and engaged in payment system redesign.- Involved in the process of interviewing new employees, as well as their onboarding and mentoring on the project.Stack: Go, Kotlin, VueJs, PostgreSQL, MongoDB, Redis, Kafka, Kubernetes, GitLab

I was engaged in a project of a U.S telecom client-company.Achievements:- Solved about 100 critical production problems in an ecosystem where every component is critical to safety around the world.- Responsible for adapting existing api for new UI requirements Communicating with the frontend team to finalize new UI and prepare the API to meet requirements;- Accelerated the average performance of sql queries by 20% based on the collected metrics;Key responsibilities:- Partitioning of the existing monolith into microservice infrastructure using Spring Cloud stack and Apache Kafka;- Dealing with resulted performance issues with the need to migrate data from PostgreSQL to MongoDB due to the increased load on the primary database;- Refinement of existing MVC frontend on Apache Struts using, jQuery, datatables, and other libs;- Conducting integration and unit testing with Junit 5, Mockito, Testcontainers;

Work on a project for a German automotive corporationAchievements:- Developed an automation testing library for project needs, which significantly reduce the time for the all autotest teams to deploy the test infrastructure for the serviceKey responsibilities:- Take a part in developing a distributed car sales system on a microservice architecture from scratch and rewriting the existing monolithic application replacing it with to cloud landscape with the new requirements. Implementing logic between applications based on an event-driven approach via Apache Kafka;- Was responsible for the implementation of data streaming via Kafka Streams. Wrote the infrastructure code needed for proper data processing and handle;- Setting up the Elasticsearch tokenizers, indexes and filters to assure its meet expectations;- Actively and closely involved in working with the frontend team on UI and preparing API for Angular framework requirements;

Taken for a project in American audit and consulting companyAchievements:- Built and documented the on-boarding process for the project. Conducted on-boarding for newcomers to the team, helped them with adaptation;Key responsibilities:- Participating in the development of an application on Java 11, Spring MVC, Thymeleaf, Spring Security with authorization and access rights, Spring Data Jpa, Hibernate;- Implementing requirements using PostgreSQL, HSQLDB and MongoDB databases;- Writing integration layer for the application using GraphQL API and Apollo client;- Participating in the development of the Front-end implementation using React;- Conducting integration and unit tests with Junit 4, Mockito;- Implement new features, bug fixes and performance improvements in the current codebase based on the requirements;