sigachev

Fintech Startup: Social platform for traders enabling real-time community updates to influence portfolios and decision-making. Architected and Implemented Microservices: Designed and built Java-based microservices using Spring Boot, ensuring scalable and maintainable solutions for the application. Developed RESTful APIs: Created robust RESTful APIs to enable seamless interaction between microservices and external systems. Front-End Development: Engineered front-end components using React and TypeScript to enhance user experience and interface functionality. Real-Time Data Processing: Utilized Web Sockets for real-time updates within an event-driven architecture, ensuring timely and accurate data delivery. Security Implementation: Implemented secure microservices architecture with JWT and Keycloak for robust authentication and authorization. Cloud Infrastructure Management: Designed and deployed scalable infrastructure on AWS, including VPC, API Gateway, Lambda, ECS, ECR, DNS, S3, Cloud Map, and CloudFormation. Real-Time Stock Market Data Processing: Leveraged Java Web Flux to consume, process, and store stock market data in PostgreSQL, and stream real-time updates to end-users. Web3 & Blockchain: Set up and maintained RPC nodes and subgraphs (The Graph) for Ethereum, Arbitrum, Optimism, Polygon, Base and other chains. Kubernetes Cluster Management: Configured and managed a Proxmox Kubernetes cluster to handle high-load services.

Developed an AI-powered, real-time analytics platform for big data processing and predictive failure detection in large-scale IT infrastructure. Microservices Architecture: Designed and architected Java-based microservices for real-time big data systems, optimizing the processing of large data volumes within an event-driven microservices framework. Team Leadership: Led the development team in creating scalable, high-performance services. API Development: Implemented and managed RESTful APIs to ensure seamless communication between microservices and external systems, overseeing the design and architecture of the APIs. Security Integration: Enhanced communication security within the microservices architecture by optimizing advanced JSON Web Token (JWT) authentication mechanisms using the Java Spring framework. System Integration: Spearheaded the integration of Java Spring applications with Keycloak, Kafka, Flink, and Spring Boot microservices, ensuring a secure and cohesive authentication and authorization workflow. Technology Utilization: Employed Java, Spring Boot, WebFlux, Keycloak, Apache Flink, Apache Kafka, Postgres and ClickHouse DB to develop responsive and scalable systems capable of handling dynamic workloads. Monitoring and Observability: Integrated Prometheus, Grafana, and AWS X-Ray for comprehensive monitoring and observability, enabling effective system performance tracking and issue diagnosis. Infrastructure Deployment: Built and managed infrastructure on AWS and bare metal servers, including Proxmox VE with Kubernetes cluster, backup servers, DNS, firewalls, and WireGuard VPN. Deployed ETL pipelines using Apache Flink on AWS, including VPC, IAM, EC2, RDS, ECS, S3, API Gateway, Kinesis, Firehose, Kafka, CodeBuild, and CodePipeline. CI/CD Implementation: Implemented and managed continuous integration and continuous deployment (CI/CD) pipelines using AWS CodePipeline and Jenkins, ensuring rapid and reliable software delivery. High Availability and Fault Tolerance: Ensured high availability of services through AWS Multi-AZ deployments and load balancing.

Pacific Specialty Insurance Company Projects: Quote-to-Buy App, Document Management System, Email Parsing & Notification System. Microservices Development: Designed and developed scalable Java-based microservices solutions, utilizing Spring Boot to ensure high performance and reliability across applications. API Integration: Integrated RESTful APIs to facilitate seamless communication between front-end interfaces and microservices, overseeing API design and integration strategies. Code Quality and Mentorship: Conducted comprehensive code reviews, provided technical guidance, and mentored team members to enhance their skills and uphold coding standards. Performance Optimization: Optimized microservices for improved performance, reliability, and security, implementing best practices to enhance system efficiency. System Monitoring and Optimization: Tracked and optimized system performance, guiding the team in adopting effective monitoring and observability practices. Technology Stack: Utilized Java 11, Spring Boot, Node.js, AWS, OAuth2, Okta IAM, Angular 11, GitHub, Maven, SOAP & REST APIs, and AWS Lambda. AWS Expertise: Leveraged AWS technologies including EC2, S3, VPC, EKS, ECS, API Gateway, Lambda, and DynamoDB to build and deploy robust cloud solutions.

Developed and maintained corporate E-commerce web-based application from scratch. Provided technical leadership and guidance throughout the entire development lifecycle, ensuring adherence to best practices and project milestones. Mentored junior developers, conducting regular code reviews and providing constructive feedback to foster skill development and maintain high coding standards. Collaborated closely with stakeholders to gather requirements, define project scope, and deliver solutions that met business objectives and user needs. Technology used: Java 8, Spring Boot 2.2, Spring Security, Microservices, OAuth 2.0, Angular 8, REST API, Hibernate, MySQL, HTML, CSS, JavaScript, JSON, XML, Web Services.

Design, develop and test programs for storing, locating and retrieving data and information for customer prescription management system. Track and optimize system performance, guiding the team in monitoring best practices. Ensured seamless integration of various modules and components within the application architecture, leveraging Java, Spring, JavaScript, and other technologies to create a cohesive and scalable solution. Technology used: Java, Swing, MySQL, XML, XSL, ETL.