Кирил

Kyrylo Savenko
Full-stack Engineer — React, TypeScript, Next.js
Dnipro, Ukraine · [open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · Telegram: @Tkri22 · GitHub: https://github.com/Kiril15 · Portfolio: link
Summary
Front-end engineer with 2.5 years of commercial experience who builds products from scratch: architecture, UI system, API integration, production. Launched a subscription SaaS platform (My Fitness Club), a payment platform (PAYMEX) and several e-commerce products, working solo or in small teams.
Core stack: React, Ts, Next.js, TanStack Query, react-hook-form + zod, Tailwind CSS. Full-stack background in NestJS and PostgreSQL, so I implement auth flows on both the client and the server and know how sessions, CORS and CSRF behave in production.
Skills
• Core: React, Ts Next.js (App Router), Vite
• Data and forms: TanStack Query, react-hook-form + zod, Zustand, Redux Toolkit, Formik + Yup
• API and auth: REST, typed API clients generated from OpenAPI, JWT and cookie-based sessions, token refresh, CORS, CSRF, SameSite
• UI: Tailwind CSS, Radix UI / shadcn/ui, SCSS, Framer Motion, component libraries built from Figma, responsive layout
• Architecture: Feature-Sliced Design, monorepo (pnpm workspaces, Turborepo),
• Also: React Flow (node-based editors), React Native / Expo
• Back end: Node.js, NestJS, PostgreSQL, Prisma, Redis, Stripe
• Tooling: Git, Docker, Vercel, Railway, AI-assisted development (Claude Code)
Experience
Independent Front-End / Full-Stack Developer
April 2025 – Present · Remote
• Build web products end to end for clients in Ukraine and the EU: front-end architecture, UI from Figma or my own UX/UI, API integration, deployment.
• Delivered 10+ production sites and applications, including a subscription SaaS platform, a payment platform and several online stores.
• Set up each front end from zero: project structure (Feature-Sliced Design), typed API layer, shared UI components, auth, localization.
• Own tasks from estimate to production with no intermediate management; work directly with product owners and back-end developers.
• Make the technical decisions: stack, state and data-fetching approach, code conventions.
Front-End Developer — MCS
March 2024 – April 2025 · On-site
• Developed SPAs and adaptive websites with React, Next.js and Redux Toolkit.
• Integrated REST APIs and built validated forms with Formik + Yup.
• Implemented responsive layouts from design mockups.
• Took part in code review and worked in a Git-based team workflow.
Products built from scratch
My Fitness Club — subscription SaaS fitness platform
my-fitness-club.com · Next.js (App Router), TypeScript, Tailwind CSS, NestJS, PostgreSQL, Prisma, Stripe, Redis
• Designed and built the whole platform: public site, user area and an admin panel with a CMS editor.
• Auth and access control: JWT authentication, feature gating for three Stripe subscription plans, Redis-cached subscription checks.
• Localization: EN/DE public site with translations edited in the admin CMS; two-locale admin panel on next-intl.
• Training program builder (programs, days, workout items) and AI recommendations for the top plan.
• Deploy to a VPS server.
PAYMEX — payment platform
paymex.io · Next.js, TypeScript, Google Sheets API, Framer Motion
• Built the site from a Figma mockup: responsive layout, animated UI (SVG diagrams, timelines).
• Integrated the Google Sheets API as the data source.
Holy Drip — fashion e-commerce
Next.js, NestJS, Prisma, Sanity CMS, Cloudinary
• Storefront with a custom brand design system.
• Sanity publish webhooks that sync the catalog to the back end through Prisma; Cloudinary image pipeline.
Hab — site generator for my own client pipeline (in progress)
pnpm workspaces, Turborepo, Next.js, NestJS
• Monorepo with a web app, a separate API service and shared packages.
• Generates configurable Next.js projects from templates, replacing repeated setup of layout, language switching and SEO.
Also: SongToGift (Next.js store with Stripe checkout and affiliate tracking) and online stores on Next.js + Sanity with Zustand carts, tiered pricing and technical SEO.
Education
Self-education: Udemy courses and practical projects.
Languages
Ukrainian — native · English — Intermediate