Dmytro K.

👋 𝐇𝐢, 𝐈’𝐦 𝐃𝐦𝐲𝐭𝐫𝐨, 𝐚 𝐒𝐞𝐧𝐢𝐨𝐫 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐰𝐢𝐭𝐡 𝟔+ 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞. I build production backends with Node.js, NestJS, Express, PostgreSQL, MongoDB, and AWS, covering APIs, databases, cloud infrastructure, and deployment. My work covers architecture, integrations, deployment, and production support. I can build a backend from scratch, take over an existing system, or help a growing product become more stable and scalable. I also bring Full Stack Developer experience with React, Next.js, and TypeScript when a project needs backend ownership together with dashboards, admin tools, or frontend integration. I actively use AI-assisted development and Spec-Driven Development to improve code quality, reduce implementation errors, and deliver backend features faster without sacrificing reliability or maintainability. • 100% Job Success and Top Rated Plus on Upwork • 6+ years building production backend systems and AWS infrastructure • Video platform supporting 300K+ monthly visitors • Experience with complex SaaS, FinTech, payments, Web3, and data-intensive products • Up to 3x faster feature delivery with AI-assisted development 📌 𝐈𝐍𝐃𝐔𝐒𝐓𝐑𝐈𝐄𝐒 FinTech • Payments • Crypto & Web3 • eCommerce • SaaS • B2B Platforms • Sport & Fitness • Healthcare • EdTech • Logistic • HoReCa • Social Media 📌 𝐒𝐄𝐑𝐕𝐈𝐂𝐄𝐒 • Backend architecture and API development • MVP & Proof of Concept development using AI-assisted Spec-Driven Development for faster validation, structured implementation, and fewer errors • Node.js, NestJS, and Express development • REST APIs, GraphQL, and third-party integrations • PostgreSQL, MongoDB, and database architecture • Authentication, permissions, queues, webhooks, and background processing • AI agents, agentic workflows, RAG systems, LLM-powered backend services, and AI automation • OpenAI, Claude, and external AI service integrations • Payment, real-time, and external API integrations • AWS infrastructure, Docker, Kubernetes, CI/CD, and cloud deployment • AWS Lambda, EC2, S3, RDS, API Gateway, and CloudFront • Backend modernization, refactoring, and performance optimization • React, Next.js, dashboards, and internal tools when Full Stack support is needed 📌 𝐒𝐄𝐋𝐄𝐂𝐓𝐄𝐃 𝐖𝐎𝐑𝐊 Truvid | Media & Video Node.js Developer on a platform supporting 300,000+ monthly visitors. Built scalable backend infrastructure, video management services, multi-role dashboards, search, recommendations, sharing, and analytics using Express, MongoDB, and AWS. Arrears | FinTech & Payments Backend Developer on a debt collection and payment platform. Built payment workflows, automated dashboards, reporting, and integrations with Salesforce, QuickBooks, and Xero using NestJS. Trustyfy | FinTech & Web3 Built backend services for crypto and fiat asset management, wallet workflows, collaboration, multi-step approvals, and compliance dashboards using NestJS, Moralis, WalletConnect, and AWS infrastructure. 💡 𝐖𝐇𝐀𝐓 𝐈 𝐇𝐄𝐋𝐏 𝐒𝐎𝐋𝐕𝐄 I usually help clients who need to: • build a backend or Full Stack MVP from idea to production • add new features, refactor, or stabilize an existing Node.js application • improve API design and frontend-backend collaboration • build dashboards, admin panels, and internal tools on top of a reliable backend • integrate payments, webhooks, third-party APIs, and real-time functionality • resolve performance, database, authentication, or infrastructure bottlenecks • modernize AWS infrastructure and simplify deployment • work with one Senior Backend Developer who can also contribute across the Full Stack I help build backend systems with clear architecture, reliable integrations, maintainable code, and infrastructure ready to grow with your product. You get senior backend ownership across Node.js, NestJS, Express, databases, integrations, and AWS DevOps, plus Full Stack Developer experience with React, Next.js, TypeScript, dashboards, and admin interfaces. 🚀 𝐋𝐄𝐓’𝐒 𝐓𝐀𝐋𝐊 Send me your requirements, current product, or codebase. I'll review the scope and share the most relevant experience and recommended next steps. full stack developer, backend developer, javascript developer, react developer, node.js developer, nodejs developer, nodejs backend developer, node.js backend developer, node js developer, node.js react, node.js graphql, node.js aws, node.js backend, react.js node.js, backend node.js, backend nodejs, node.js, nodejs, react node, full stack developer react node, web developer, back end developer, backend engineer, aws devops engineer, aws devops, aws architect, cloud engineer, kubernetes, aws dev ops, aws developer, aws certified developer, aws docker, aws big data, aws dynamodb, aws rds, aws lambda, aws, nestjs developer, nextjs developer, nextjs tailwind, nestjs, react nextjs, nest.js, nextjs, next.js, react, mern, express js, express.js