I took role in Enterprise Solutions team of Upwork to provide premium services to enterprise clients.- I worked mainly at back-end side development.- I participated functional test development and automation.- I conducted leadership of several cross-team initiatives including new feature development, modernization or migration between features, technology or features including UX concerns as well.- I conducted several proof of concept development activities.- I prepared and presented architecture and design proposals as well as reviewing those proposed by others.- I did task elicitation from epics or user stories by cooperating with product managers, and/or from doing reverse engineering on source codes of the existing system and effort and time estimation of those tasks.- We had a cycling on call periods based on defined SLOs to be able to handle and troubleshoot the problems at production before or after they become an incident.My tasks and the relevant technologies included:- Microservice development using Java, Dropwizard, Google Guice- Web API development using REST, GraphQL, JSON and Thrift- Optimizing the software for high performance and resiliency by using - Fault tolerance with Hystrix - Reactive programming with RxJava. - Caching with Redis, Memcached, etc - Event streaming with Hermes and custom queue mechanisms on DB- Data management with - PostgreSQL over JDBI library - Managing the schema changes with Liquibase - Presto, SnowFlake, Redash- Effective incident handling and root cause analysis- BPMN with Camunda- Unit test development with Junit and Mockito- Integration test development with REST Client Driver- End to end test development with Ruby- Observability and log tracing with Prometheus, Grafana, Kibana.- Batch processing with RunDeck- Configuring and maintaining CI/CD with Jira, Bitbucket and Jenkins- Code review, code quality improvement, refactoring activities

- Technical project, product and sub-constructor management.- Development of technical solutions for bidding.- Concept development of new projects using MVP (Minimum Viable Product) approach.- Building estimations about work size, staff and time needs.- Negotiating with customers for having consensus on proper solutions.- Taking "make or use/buy" decisions by capturing insights of whole project and product dynamics.- Gathering, perception, elicitation and management of user needs and requirements.- Carrying out product owner and scrum master roles in agile projects.- Development of project phases, milestones, release and iteration plans.- Developing operational concepts and designing dynamic work flows.- Development and management of user stories.- Designing user interfaces and interactions to provide a good user experience.- Development of system and software architectures at high and detailed levels.- Development of tasks in both project and product level.- Leading and orchestrating the local and virtual teams by considering product features and dependencies.- Engaging the team to tasks by providing clear information and mentoring, training and inspiring them.- Building and leading the teams by motivating and keeping them on product scope and goals.- Hosting and management remote/virtual meetings resulting in clean and applicable resolutions.- Giving support to develop test approaches, methodologies and acceptance criteria for product features.- Gathering, analyzing and monitoring the work performance measurements and test results.- Participating and managing the demonstration, installation, PoC, acceptance and support activities.- Aiming high quality for products while considering feasibility and all constraints and risks.- Providing an efficient development environment to team through a DevOps mindset. - Participating actively and effectively in software development activities.