Sergei Kosyi

- Help drive modernization of the enterprise analytics landscape by unifying 10+ legacy analytics stacks into a cloud-native GCP lakehouse based on Medallion Architecture and Domain-Driven Architecture, improving time-to-market for new data use cases. - Designed reusable ingestion architecture for 60+ batch and streaming data feeds, covering SFTP, RDBMS, APIs, and Kafka. - Established architecture rules, principles, ADRs, and platform patterns to standardize onboarding and improve solution consistency acros

- Led architecture strategy and governance for the Big Data department, standardizing HLD/LLD, ADRs, and technology radar. - Managed and developed a team of 5-10 architects supporting product teams across a petabyte-scale Hadoop data platform. - Scaled architecture capability through 100+ solution architect interviews, knowledge-sharing formats, architecture katas, internal meetups, and hands-on support for product teams. - Increased architect retention from 1 year to 3 years and supported career growth int

- Designed solution and system architectures for data-intensive products, including recommendation APIs, bank scoring APIs, advertising/data management platforms, streaming data capture, and ad hoc analytics. - Created HLDs and architecture documentation covering context, containers, components, data flows, sequence diagrams, network design, deployment architecture, and data models. - Defined non-functional requirements and selected architecture patterns based on scalability, latency, security, availability

Responsibilities - design and development of new functionality for sales, back-office, legal, risk departments; - design and development of integrations with 3-d party services and systems; - analyzing and fixing performance bottlenecks; - troubleshooting and bug fixing; - participation in project planning meetings; - consulting of business departments; Terrasoft CRM was launched in production. It’s become the main Front-End application for almost all business departments. The number of users was increased

Responsibilities - implementation, deployment, maintenance and support of new features in Pivotal CRM for the Order processing, Delivery management, Contracts management, Marketing departments etc.; - technical support and consulting Customer’s IT departments; - troubleshooting and bug fixing; - design, implementation, deployment, maintenance and support of Windows Mobile Application (Collections Taking System), integrated with Pivotal CRM; - design, implementation, deployment, maintenance and support of Da

Responsibilities - design and development of new functionality for sales, back-office; - architectural supervision for vendor’s solutions; - participate in project planning meetings with a vendor as an expert; - QA of vendor's changes in the system; - development and support of Integration services; - troubleshooting and bug fixing using a bug tracking system; - consulting of business departments; - import data into the system for initialization; Terrasoft CRM was prepared for Production. It has been imple