The back-end developer has 8 years of experience and is proficient in JavaScript, Node.js, Nest.js, and TypeScript. My focus is on high-load projects, indicating a deep understanding of scalability, performance optimization, and other crucial aspects of back-end development. I also have experience with a progressive tech stack, suggesting they keep up to date with the latest technologies and trends in the industry. With this level of experience, I'm capable of developing complex systems with robust functionality and high performance.