Anton Shumeiko

Domain: AI / Consumer SaaS • Leading key parts of the AI product engineering, with a focus on LLM quality, routing, experimentation, and product performance. • Built and improved core AI infrastructure, including model auto-routing, system prompt optimization, evaluation workflows, and observability. • Drove latency and cost reductions while improving response quality and consistency across LLM-powered user flows. • Running A/B testing, Langfuse, Mixpanel, and AI UX optimization to make product decisions more measurable and scalable. • Helped turn AI capabilities into reliable, production-ready product systems.

Domain: AI, SaaS, Crypto, Job Matching, Marketing Automation • Delivered SaaS platforms across multiple industries (art-tech, influencer discovery, AI-powered job search, marketing automation), from design to production launch. • Built and deployed complex full-stack applications and white-label SaaS solutions using Next.js, Supabase, and modern CI/CD workflows. • Designed custom AI (Voice\Chat\Research\Trading assistants) Agents and automation pipelines (OpenAI, DeepSeek, LangChain, LongGraph, n8n, Make, ManyChat) to power workflows like SMM content creation, lead generation, lead qualification and scheduling. Technologies: Next.js, React, TypeScript, LongChain, LongGraph, ManyChats, Python, Supabase, Xano, Airtable, Vercel, OpenAI API, DeepSeek API, LangChain, n8n, Make.com, Zapier, OpenRouter, Apify, GitHub Copilot, Instagram Graph API, CI/CD (GitHub Actions), Vite, Cursor, Windsurf, Bolt.new

Domain: Accounting / FinTech • Contributed to a Big 4 platform used by 400K+ users, built with a micro-frontend architecture. • Rewrote routing system across 10+ micro-frontends using modern React Router and React 18. • Integrated React Query across the app to replace legacy data-fetching logic. • Implemented globalization support and coordinated rollout with 10+ team leads across distributed teams. • Upgraded libraries, ensured CI/CD readiness, and supported successful production deployment. Technologies: React 18, TypeScript, Ant Design, React Query, GitHub Actions, Cypress, CI/CD

Domain: Charity / Non-Profit • Designed, developed, and deployed a full-stack donation platform supporting humanitarian food aid in Ukraine. • Built responsive web UI, custom admin dashboards, and integrated payment and user management systems using Next.js and Supabase. • Collaborated with design and backend teams to deliver high-performance UX across mobile and desktop. • Implemented image optimization, lazy loading, and analytics tracking to support SEO and MVP goals. Technologies: Next.js, TypeScript, Node.js, MUI, Styled Components, i18n, SQL, CSS-in-JS, a11y

Domain: EdTech / AI • Led core frontend development, delivering ~40% of product features for a Silicon Valley-based international EdTech startup. • Built student, parent, and educator-facing web platforms, a back-office admin console, and sales dashboards. • Collaborated daily with stakeholders, CEO, and CTO to align technical decisions with product goals. • Integrated GPT-powered workflows using OpenAI API, including AI essay writing, review tools, tutoring assistant, and chat features. • Upgraded systems to React 18, improved performance, contributed to architecture, developed 30+ reusable UI components, and implemented full CI/CD with comprehensive testing. Technologies: React, Next.js, TypeScript, Tailwind CSS, Redux, OpenAI API, Swagger, Storybook

Domain: FinTech/Marketing • Built B2B marketing dashboards using micro-frontend architecture and backend-for-frontend (BFF) APIs with Node.js. • Developed shared Material UI-based component libraries with full Storybook and Webpack setups for cross-team reusability. • Implemented secure API gateways, contributed to backend tasks, and reduced build time by 20% through CI/CD and Webpack optimizations. Technologies: React, TypeScript, Node.js, Express, Webpack, Jenkins, MongoDB

Domain: Healthcare / E-commerce • Developed a complex eCommerce platform in the healthcare domain, focusing on admin panel functionality and performance. • Fully rewrote a legacy JavaScript admin panel using modern React and Material UI, significantly improving maintainability and speed. • Contributed to design-to-code delivery with high Lighthouse performance and accessibility standards. • Delivered pixel-perfect layouts in close collaboration with backend, QA, and design teams using Zeplin. • Implemented and maintained custom WordPress solutions, including deployment, configuration, and plugin-level PHP customization. Technologies: React, TypeScript, Material UI, SCSS, Firebase, Webpack, Docker, Git,Zeplin, SQL, WordPress, PHP

'Educational and Scientific Institute 'Institute of Geology' 'Hydrogeology and Engineering Geology ' speciality

'Educational and Scientific Institute 'Institute of Geology' 'Hydrogeology and Engineering Geology ' speciality