Sergii – React, Typescript, Node.js

An intelligent chatbot for B2B sales that guides users through product presentations and answers questions in real time.

• Designed and implemented a full-stack MVP for an AI-powered sales assistant using Node.js, React, and LangChain, going from concept to production in 3 weeks;
• Built a hybrid retrieval architecture with vector embeddings, reducing response latency to <2s;
• Integrated third-party authentication, analytics, and telemetry systems, cutting time-to-market by 50%;
• Developed conversational UI with embedded analytics, improving onboarding speed and first-result time by 40%.

An AI-powered SaaS Talent Intelligence Platform that integrates recruiting CRM, ATS, sourcing, contact discovery, automated outreach, and analytics into one unified tool to streamline the entire hiring workflow.

• Contributed hands-on to React/Ruby services, GraphQL integrations, and admin dashboards;
• Designed reusable component systems and frontend infrastructure for multi-tenant SaaS apps;
• Delivered a revenue-impacting feature generating $100K +/year;
• Modernized core UI and improved retention/conversion through performance and UX updates;
• Implemented CI/CD workflows, automated testing, and deployment pipelines to accelerate delivery.

A professional-grade website builder launched in early 2021, designed for users seeking advanced customization and more control over design and functionality. The platform has since been rebranded to reflect its studio-focused capabilities.

• Built collaborative UI architecture for a professional website builder, enabling real-time multi-user editing at scale;
• Delivered key features that enhanced team collaboration for agencies, significantly increasing platform value for enterprise users and helping acquire 200K+ new corporate clients in the first year after launch;
• Developed robust infrastructure for A/B testing and end-to-end testing of third-party apps, improving CI stability and reducing build times by 30%.

It is a global online genealogy and family-history platform that helps users build family trees, explore billions of historical records, use DNA testing for ancestry insights, and enhance old photos with AI-powered tools.

• Coded and shipped new features for health and genealogy platforms, contributing to significant year-over-year revenue growth;
• Developed AI-based photo enhancement and colorization tools used by millions of users;
• Led the migration from SVN to Git for the entire R&D department (100+ developers), improving feature delivery speed by 50% through implementing code review practices and CI automation;
• Designed the MVP, managed its rollout, and created training materials and documentation to ensure a smooth transition.

It is an enterprise-grade, cloud-based digital asset management platform that enables organizations to centralize, organize, distribute, and analyze both Getty-licensed and their own creative content in one secure, metadata-rich environment.

• Designed and implemented the frontend architecture for a media content management system, integrating seamlessly with existing legacy systems;
• Developed critical Node.js microservices from scratch, including an API gateway and image converter, enhancing platform functionality and performance;
• Built a comprehensive UI component library and style guides in collaboration with designers, standardizing branding for over 500 clients;
• Led and developed the redesign of an external media CMS project, helping retain major enterprise clients and attract new ones;
• Implemented a robust CI pipeline with automated unit testing, screenshot testing, Docker builds, and deployments across multiple environments, ensuring scalability and maintainability.