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I’m Vitaliy Mitnichuk, a fullstack software engineer specialising in SaaS platforms, multi-tenant architectures, and AI-powered tooling. I take ownership end-to-end—from architecture and stack selection through to cloud deployment and long-term maintenance—building production-grade systems with React, Next.js, Node.js, and NestJS. I’ve delivered multiple client platforms across different business domains and shipped advanced product features like real-time notifications, search, multi-tenant RBAC, and AI automation (RAG-based support tooling). I also enjoy mentoring teams, maintaining high engineering standards, and improving performance and SEO for real users.…I’m Vitaliy Mitnichuk, a fullstack software engineer specialising in SaaS platforms, multi-tenant architectures, and AI-powered tooling. I take ownership end-to-end—from architecture and stack selection through to cloud deployment and long-term maintenance—building production-grade systems with React, Next.js, Node.js, and NestJS. I’ve delivered multiple client platforms across different business domains and shipped advanced product features like real-time notifications, search, multi-tenant RBAC, and AI automation (RAG-based support tooling). I also enjoy mentoring teams, maintaining high engineering standards, and improving performance and SEO for real users.

Vitaliy Mitnichuk

Full Stack Developer, Software Engineer, Front-End Developer, +2

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I’m Vitaliy Mitnichuk, a fullstack software engineer specialising in SaaS platforms, multi-tenant architectures, and AI-powered tooling. I take ownership end-to-end—from architecture and stack selection through to cloud deployment and long-term maintenance—building production-grade systems with React, Next.js, Node.js, and NestJS. I’ve delivered multiple client platforms across different business domains and shipped advanced product features like real-time notifications, search, multi-tenant RBAC, and AI automation (RAG-based support tooling). I also enjoy mentoring teams, maintaining high engineering standards, and improving performance and SEO for real users.…I’m Vitaliy Mitnichuk, a fullstack software engineer specialising in SaaS platforms, multi-tenant architectures, and AI-powered tooling. I take ownership end-to-end—from architecture and stack selection through to cloud deployment and long-term maintenance—building production-grade systems with React, Next.js, Node.js, and NestJS. I’ve delivered multiple client platforms across different business domains and shipped advanced product features like real-time notifications, search, multi-tenant RBAC, and AI automation (RAG-based support tooling). I also enjoy mentoring teams, maintaining high engineering standards, and improving performance and SEO for real users.

Available to hire

I’m Vitaliy Mitnichuk, a fullstack software engineer specialising in SaaS platforms, multi-tenant architectures, and AI-powered tooling. I take ownership end-to-end—from architecture and stack selection through to cloud deployment and long-term maintenance—building production-grade systems with React, Next.js, Node.js, and NestJS.

I’ve delivered multiple client platforms across different business domains and shipped advanced product features like real-time notifications, search, multi-tenant RBAC, and AI automation (RAG-based support tooling). I also enjoy mentoring teams, maintaining high engineering standards, and improving performance and SEO for real users.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Advanced

Czech

Beginner

Ukrainian

Fluent

Work Experience

Fullstack Developer at ITre Solutions

August 1, 2024 - July 1, 2026

Independently architected and delivered multiple B2B/B2C SaaS and multi-tenant platforms for clients in fashion, sales, and construction. Owned the full lifecycle: stack selection (React, Next.js, Node.js, NestJS, Supabase), feature development, and cloud deployment with post-launch maintenance. Built an AI-powered customer support automation tool using RAG-based email analysis, automated categorisation and label assignment, inventory-aware context retrieval, and reply suggestions to reduce manual workload. Designed scalable multi-tenant architectures with isolated data layers, role-based access control, and modular service structures so one codebase could support different business domains without rework. Managed multiple client platforms simultaneously with emphasis on quality, scalability, and maintainability.

Frontend Developer at Hashtagfox

February 1, 2022 - July 1, 2024

Shipped three production products—ProServiceDesk (multi-tenant CRM with custom roles/permissions, live audio/video chat, and Google Maps worker tracking), Brainbubble (AI assistant app), and ScreensDesign.com—taking each from concept to production. Implemented advanced functionality including full-text search via Elasticsearch, tenant-configurable dynamic tables with custom filters/sorting, real-time ticket notifications, and an integrated live chat with audio/video calling. Improved Technical SEO and Core Web Vitals for image-heavy, high-request pages using Next.js SSR/SSG, caching, state management optimisations, semantic HTML, and structured metadata. Designed a shared reusable component library used across CRM, a mobile companion app, and marketing surfaces; maintained code quality through reviews, targeted refactoring, and performance audits to reduce regressions.

Frontend Developer at Lobo Eats

October 1, 2021 - February 1, 2022

Architected and built a dual-interface food ordering platform with a vendor dashboard (React/Next.js) for restaurant owners to manage menus and listings and a customer portal for browsing and purchasing food. Integrated backend APIs to synchronise real-time menu data, live order status, and payment flows to keep vendor and customer experiences consistent with correct state transitions.