Danil S.

Senior Full-Stack Developer with 8+ years of experience building scalable web applications, high-load backend systems, real-time platforms, and blockchain solutions. I help startups and growing businesses turn ideas into reliable, production-ready products. From designing system architecture and building scalable APIs to developing modern frontend applications and optimizing performance, I take ownership of features from concept to deployment. Throughout my career, I've worked across several complex industries, including Industrial Automation (SCADA), FinTech, Crypto Exchanges, Web3, SaaS, and Messaging Platforms. I have experience building scalable backend systems, designing REST and GraphQL APIs, implementing real-time communication with WebSockets, and working with event-driven architectures using RabbitMQ and Apache Kafka. This experience allows me to quickly understand business requirements and deliver practical, maintainable solutions. What I can help you with ⭐ Full-stack web application development ⭐ Backend development with Node.js & NestJS ⭐ React, Next.js, Vue.js & Nuxt applications ⭐ REST API & GraphQL development ⭐ Authentication & Authorization (JWT, OAuth, RBAC) ⭐ WebSocket & real-time applications ⭐ Event-driven architectures with RabbitMQ & Apache Kafka ⭐ PostgreSQL, MongoDB, MySQL & Redis ⭐ Performance optimization & scalability ⭐ Cloud deployment (AWS, Docker, CI/CD) ⭐ Blockchain & Web3 integrations Technologies ⚙️ Languages: TypeScript, JavaScript, Python, SQL ⚙️ Frontend: React, Next.js, Vue.js, Nuxt, React Native ⚙️ Backend: Node.js, NestJS, Express, Fastify, REST APIs, GraphQL, WebSockets, RabbitMQ, Apache Kafka, Authentication & Authorization (JWT, OAuth) ⚙️ Databases: PostgreSQL, MongoDB, MySQL, Redis ⚙️ Cloud & DevOps: AWS, Docker, CI/CD, GitHub Actions, GitLab CI, Linux, Nginx Why clients work with me ✅ 8+ years of commercial development experience ✅ Strong background in high-load, distributed, and real-time systems ✅ Experience with event-driven architectures and asynchronous messaging ✅ End-to-end feature ownership, from architecture to deployment ✅ Clean, maintainable, and scalable code ✅ Clear communication and reliable delivery ✅ Comfortable working independently or as part of an existing team Whether you need to build a new product, scale an existing platform, improve frontend/backend performance, integrate third-party services, or develop new features, I'd be happy to help. Let's discuss your project and find the best technical solution for your business.