Valerii Z.

Full stack Systems Engineer

Senior full stack engineer and tech lead, build products across web, desktop, and CLI platforms. I work on every layer of the stack, combining deep engineering depth with team leadership experience. Whether you are launching a new product, migrating legacy code, or shipping a design system, I bring the technical judgment and architecture experience to make decisions that scale. The Solo Engineer Guarantee: No handoffs. No junior devs. No communication gaps. When you hire me, you get 10 years of senior judgment applied to every line of code. ◆ Why Work With Me • 10 years building production grade applications used by thousands. • Expert in React, TypeScript, Node.js, Next.js, AWS, and cloud infrastructure. • Led large scale refactoring and frontend migrations in multicultural teams. • Built custom frameworks, internal libraries, and optimized CI/CD pipelines. • Open source contributor and technical writer on practical software engineering. • Honest recommendations, even when that means suggesting a different approach. ◆ Services • Full Stack Web Development: From concept to production deployment. • Frontend Architecture: Design systems, component libraries, performance optimization. • Project Rescue: Fix bugs, refactor legacy code, modernize UI, and get stalled projects back on track. • Cloud Infrastructure: AWS setup, CI/CD automation, deployment pipelines. • AI Assisted Development: Used deliberately with senior judgment on quality and architecture. ◆ Let's Build Something Great Every project I take on gets my full attention. I work solo, limit the number of simultaneous clients, and stay engaged from the first conversation through delivery. If you want to talk through your project, I am happy to start with a short call. No pitch and no obligation.