Project: the high-load distributed system, which provides real-time online gaming solutions, video streaming, and rich admin capabilities. The system contains flexible monitoring and observability tools, is developed using XP practices, and is delivered using zero-downtime feature deployment. Accomplishments: - As a key developer, contributed significantly to high-profile, real-time gaming solutions. Engaged in an in-depth analysis of the product's architecture and infrastructure, enhancing its business value.- Collaborated with cross-functional teams, including Product Owners, Frontend developers, and specialized integration teams (Unreal Engine, Studio TV apps, Studio Dealer) to design and implement server communication protocols and ensure seamless team coordination.- Designed sequence diagrams, developed and delivered several key subgames, covering all aspects from concept to integration testing, ensuring adherence to specified requirements and mathematical models.- Maintained full accountability for feature lifecycle management, from initial concept to monitoring in a production environment, ensuring backward and forward compatibility in a distributed system setting.Technologies: Java 17, Spring Boot 2.7, Jetty, Netty, RPC, Protobuff, Kafka, Redis, Consul, Prometheus, Grafana, Kibana, Sentry, Micrometer, JUnit, Mockito, ArchUnit, Ansible, Jenkins.Databases: Oracle, Postgres, Clickhouse.Tools: Jira, Git (Bitbucket), Confluence, IntelliJ IDEA, Checkstyle, Figma, Excel, Swagger, Pastebot.

- Coordinated and led a team of mentors in the Java course, ensuring effective knowledge transfer and mentorship.- Facilitated daily morning lectures, engaging students with interactive and comprehensive teaching methods.- Advised students on career development, provided insightful guidance, and performed the knowledge transfer of industry best practices, approaches, and technology utilizations via live coding sessions.- Conducted technical check sessions and practice exams, effectively diagnosing areas for improvement and reinforcing learning.- Performed homework code review, and facilitated Q&A sessions for students, clarifying complex concepts and topics.

Project: Business Information and Media domain. The project provides secure / scalable / highly-available / multi-tenant cloud-based solutions for cutting-edge capabilities to efficiently enrich, manage, and deliver content, including enrichment and classification, content management / processing / ETL orchestration software, advanced tools for editorial content curation, cost-reducing standard CMS components.Tasks and accomplishments: - As a key developer, worked smoothly on delivering custom Alfresco APIs and the creation and enhancement of modules for the “Content Service Bus” ETL orchestration software, designing and implementing efficient new data pipelines.- Led the development, end-to-end testing, and delivery of a key feature that consolidated content cache and synchronized it with CMS and multiple S3 locations, achieving a performance increase of nearly 50% in custom ETL Export functionality.- Conducted in-depth troubleshooting and issue investigation for complex system components, including AWS environments. Worked in tandem with Operations and Support teams to promptly address and resolve infrastructure or deployment challenges, significantly boosting system reliability and operational performance.- Orchestrated release preparations and managed UAT deployments, ensuring seamless and efficient software rollouts.- Actively participated in Low-Level Design discussions, identifying potential issues and contributing innovative solutions to complex problems.- Provided mentorship to new team members, leading knowledge transfer sessions that promoted team development and skill enhancement.Tools: Jira, Git (Bitbucket), Confluence, Bamboo CI, Sonar Qube, Black Duck, IntelliJ IDEA, Docker, AWS console, Amazon WorkSpaces.Technologies: Alfresco Content Services 6.0, Java 11, Spring, Spring Boot, Solr, Maven, Mockito, Tomcat, AWS (S3, EC2, Lambda, ECS, CloudWatch, CloudFormation, CodePipeline, Secrets Manager), TypeScript.Database: Amazon RDS, PostgreSQL.

Customer: Education Content and Digital Learning Materials Provider.Project description: an LMS system for learning English purposes within institutions where each physical book has a complimentary digital product.Team: 6 developers, 3 QA, PM, System Analyst, Product Manager.Project role: Developer (Full-Stack)Tasks and accomplishments: - Contributed to the implementation of Learning Tools Interoperability (LTI) integration with external Learning Management Systems (LMS) like Moodle and Canvas.- Actively involved in the planning and execution of system integration with the IAM service Okta, ensuring efficient operation and security measures.- Took the initiative to continue implementing new UI functionality pages using React after the key engineer's rotation.- Performed demonstrations of completed work to clients during sprint reviews, effectively communicating project developments and gathering critical feedback.- Addressed technical debt by refactoring complex code sections, improving their maintainability and clarity, and contributing to the overall software quality.Environment: Java 8, Tomcat 8.5.34, MySQL 5.5, JSP, Struts 1.2.7, JQuery 1.4.4, Handlebars 1.0.0, Angular.js 1.5, React, Ant 1.6, Git (Bitbucket), Scrum (Jira workflow).

Customer: Business Information and Media.Project description: an LMS system for training medical students (courses, assessments, adaptive quizzing, etc).Team: 1 tech lead, 5 developers, 3 manual QA, 2 automation QA, 1 DevOps and PM.Project role: Developer (Full-Stack).Tasks and accomplishments: - Developed comprehensive reports and statistics for a hierarchical database relations model, using SQL and Scala to track key metrics like total assignments/questions completed, time spent, and grouping cases.- Implemented tasks as part of a developer training program, which included developing new types of questions, ensuring XSS validation, test coverage and technical debt decreasing.- Advanced my Scala proficiency by creating practical scripts, such as one to copy assessments between courses and another to propagate assessments from a library to all linked courses, enhancing operational efficiency.- Researched and familiarized myself with the domains, codebase, and architecture.Environment: Java 8, Scala 2, PostgreSQL 9, Angular.js 1.5, JQuery, SBT, Tomcat 7, Amazon S3, EC2, Git (GitHub), Scrum + Kanban (Jira).

Description: the educational program, which aim was to increase the hard and soft skills.Team: Java developers «on the bench», mentors, speakers.Tasks and accomplishments: - Developed pet projects, demonstrated them, and performed all SDLC activities.- Prepared presentations on some technologies and development approaches.Environment: Java 8, Maven, Hibernate, Spring, Angular 8, React.js, H2, PostgreSQL, MongoDB, Tomcat, Apache Spark, Git (GitLab).

Description: providing freelance development services to clients: backend, full-stack, database schema designing, and data analysis. Environment: Java 8, HTML, CSS, JavaScript, Python, SQL, JDBC, ADO.NET, Docker, GitHub.