Principal Software Engineer for backend development of Coinme's microservice architecture and environment, related to crypto-trading and payment fulfillments.Responsibilities:- Architecture and design for new end-2-end crypto and payment services, in line with Coinme's business strategies- Designing scalable, event-driven systems with a pluggable microservice approach, based on Command and Query Responsibility Segregation (CQRS) patterns, event sourcing and general Domain-Driven Design- Continuous review, planning and improvements of existing systems, as necessary- Development task breakdowns and assignments, implementation overview, code reviews and general guidance- Coding and implementation work with reactive Java- Production support and analyticsTechnical stack: - Java 17 with Project Reactor - Java 11 with RxJava - SpringBoot - Vert.x framework - Axon framework (4.5) - Axon Server, enterprise edition - Mongo DB and Elasticsearch (for CQRS projections) - Apache Kafka - Kubernetes and Docker - Maven, GitLab and Jira environments - Non-reactive Java 11/Springboot, Hibernate framework and MySQL for provisioning systems

- Technical lead for a startup project related to an app-based fantasy football game. Monolithic-like app setup, Java/Springboot, PostgreSQL, Redis streams, ReactJS, Kubernetes- Technical lead for a cryptocurrency trading provider. Event-driven, CQRS-based microservice architecture, developed in reactive Java (base RxJava), Springboot and Vert.x frameworks, Axon framework for CQRS facilitation, Axon Server for event sourcing, Elasticsearch and Mongo for CQRS projecitions, Kubernetes

Working as a backend Java Software Developer, working for various Five clients, as well as some development work on frontend as a ReactJs developer.Coinme- Working as a backend developer for the Coinme backend team. Developing microservices in an asynchronous, reactive, event-driven environment, structured around a Command Query Responsibility Segregation (CQRS) architecture, with event sourcing and Domain Driven Design (DDD).- Working on developing new features and functionalities in accordance with Coinme’s business requirements, as well as providing backend support services for frontend and mobile appsTechnology stack: - Java 11 with ReactiveX (RxJava 2) - SpringBoot - Vert.x Framework - Axon Framework (Axon 4) - Axon Server for event sourcing - Elasticsearch (for CQRS query projections) - Apache Kafka - Kubernetes (Docker for local deployments), with Kube and HelmCharts - Maven, Git and Jira environmentPicniic- Worked as a frontend developer in React JS (part of Five’s career shift program)Technology stack: - Javascript, HTML, CSS - ReactJS (with react hooks) - React ReduxNapster (Rhapsody) - Working as a Backend Software Developer with Napster International on Napster System's backend Platform segment - Development work focused on account and subscription management services for Napster's Partner Integration processTechnology stack: - Java 8 - Spring Core, Spring Security, Spring Batch - Spring MVC, JSP and jQuery - Hibernate/JPA - Oracle Database - Tomcat Server - Jenkins CI/CD pipeline - Maven, Git and Jira environment

- Backend development in Java EE on a telecom multi-mediation project for SAP-based converged billing- Front-end development in a project for supporting telecom operator service management, based on AngularJS, Bootstrap, jQuery- Studying Hybris and preparing to work on a Hybris-based project for a telecom operator

- Part of a development team, working on a project for developing tools for automation of node integration procedures in a Telecom operator network - Back-end Java developer working with Spring Framework, mostly Core Spring and Spring MVC - Lately started working on front-end development and web services, focused on HTML/CSS/Javascript and using AngularJS and Bootstrap framework - Working in a Maven and Git-based environment, with basic utilization of PostgreSQL and Tomcat Application Server

- Acted as Lead Solution Manager / Architect on numerous projects, efficiently coordinated activates across multi-tech teams (IP, Transport, Core, Wi-Fi, Radio Access, Charging, etc….) - Lead various technical delivery projects, assuming the role of Lead Solution Architect, focusing on solution End-2-End architecture and design- Worked on various pre-sales projects in close cooperation with Account Management and sales personnel, sometimes as Lead Solution Manager- Pre-sales work included customer engagement, pre-sales initiatives, tenders and technical sales. Successfully mapped various customer business requirements to applicable technical solutions - Worked in a fast-paced environment, short and dynamic projects with a broad range of technologies and solutions (IP Networks, Cisco technologies, Wi-Fi, IP/MPLS Transport, Operator Core, Security, IP Radio Network Access, AAA, Quality of Service, OpenStack IaaS and Cloud-based Virtualization, etc.)- Oversaw network implementation in customer networks, in close cooperation with Project Management and System Integration teams - Effectively troubleshooted and solved various IP-related issues during solution implementation or upgrade - Conducted in-depth technical discussions with customers, held numerous workshops and presentations - Drafted technical documentation, IP Networks designs, high-level designs (HLD) and low-level designs (LLD)

- Acted as Technical Lead for a network optimization project for a major telecom operator, focus on IP Transport & Core- Proposed network analysis steps, provided leadership for defining potential optimization solutions- Lead teams of up to 5 people with different technical skills