Vladimir H.

I'm a Senior Full-Stack Developer with 5+ years of experience building and fixing React, Next.js, TypeScript, React Native and Node.js products. Most of my work starts where prototypes stop: an existing SaaS product needs to scale, an AI-built MVP needs real engineering, production bugs are blocking users, or a team needs someone who can take ownership of a feature from idea to release. I don't start by rewriting everything. First I understand how the product is supposed to work, trace the current implementation, find the real source of the problem, and separate what needs to be fixed now from what can wait. That usually means working on things like: • React / Next.js SaaS applications and existing codebases • Complex dashboards, admin panels and internal business tools • React Native / Expo mobile applications • Authentication, roles, permissions and data-heavy workflows • Node.js, Supabase and PostgreSQL backend functionality • REST APIs and third-party integrations • AI features using OpenAI, LLMs and structured AI workflows • Production debugging, refactoring and performance improvements • Maps, realtime functionality, complex forms and business logic • MVP development and taking prototypes into production My core stack is React, Next.js, TypeScript, JavaScript, React Native, Expo, Node.js, Express, Supabase, PostgreSQL, Firebase, Tailwind CSS, shadcn/ui, TanStack Query, Redux Toolkit, Zustand and REST APIs. I've worked on healthcare and clinical platforms, B2B SaaS products, logistics systems, geospatial applications, real estate products, AI-powered applications and cross-platform mobile apps. One of my strongest skills is understanding an unfamiliar product quickly. I can work from a business requirement rather than waiting for every step to become a ticket. I map the user flow, identify edge cases and dependencies, make practical architecture decisions, and then implement the feature end to end. I also use Claude Code and Codex regularly for codebase exploration, debugging, implementation and testing. They help me move faster, but I still review the architecture, business logic, data flow and final code myself. If you already have a product that needs a senior engineer to take ownership, finish an MVP, fix difficult production issues or build the next major feature, send me the current state and the result you need. I'll tell you what I would tackle first.