Viktor S.

Senior full stack developer with 6+ years building and scaling production web applications for enterprise companies and independent clients. My core stack is React, Next.js, TypeScript and Node.js (NestJS/Express), with strong experience across Supabase, PostgreSQL, Sequelize, Tailwind, Redux Toolkit, Zustand and Tanstack (Query, Table). What I've delivered: - Marketing sites & landing pages: currently the solo developer for a company's marketing department, owning the landing pages and brochure site end to end (Next.js, NestJS, Tailwind, Tanstack), from implementation to deployment. - Complex product features: built a revamped expenses feature with role-based access and AI chat agent integration, inside a Turborepo with 4 microfrontends, for thousands of existing users. - Ad-tech at scale: architected a targeting platform with 21+ real-time parameters (geolocation, weather, device, audience segments, time, language), improving conversion rates and ad-spend efficiency. - New products from scratch: led development of two client-adopted web apps, one in React/TypeScript and one in Vue/TypeScript with a NestJS backend. - Legacy modernization: migrated 5 web apps and 10 microservices from Node 14 to 22 and Webpack 4 to 5 while keeping backward compatibility. - Supabase in depth: 3 years on a long-term client project covering views and materialized views, database functions and triggers, Auth, email campaigns and templates, with data-heavy interfaces built on Tanstack Query and Tanstack Table. - Integrations & automation: Stripe payments for a US client, Microsoft 365 integration to convert .docx files to PDF, and cron jobs that process data and generate PDF documents. I'm comfortable in monorepos, microfrontend architectures and cross-functional teams working from PRDs and design specs, and just as comfortable as the one dedicated developer who owns everything from product description to architecture, code and deployment. Whether it's a complex app feature, a fast marketing site, a third-party integration, or cleaning up a messy legacy codebase, I write clean, scalable code and communicate clearly throughout.