Nikola S.

Full-stack developer with a background in enterprise software and hands-on experience building and running production web applications from the ground up. I currently operate my own crypto rewards platform — I designed the architecture, built the full stack (React frontend, Express/Node.js backend, PostgreSQL database), integrated cryptocurrency payment processing, and manage the entire deployment on a VPS. Having built and launched my own product end to end — from first commit to live users processing real transactions — gives me a practical understanding of the full development lifecycle that goes beyond just writing code. Before going independent, I worked at an IT company on enterprise projects built with SAP Hybris, handling both Java backend development and frontend work, including Backoffice configuration and customization. I've also worked as a Solidity smart contract security researcher, auditing code and competing in security contests across multiple platforms. What I bring to your project: • Full-stack development: React, Node.js/Express, PostgreSQL, Java • Blockchain & Web3: Solidity, smart contract security, crypto payment integration • DevOps basics: VPS setup, deployment, database administration • The perspective of someone who's built and runs their own product — I care about business outcomes, not just code I value clear communication and attention to detail. Whether it's a quick integration or a full product build, I bring the same level of commitment to every project. I'm always looking for interesting work and new challenges.