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I am a full-stack software engineer with 7 years of experience designing, building, and scaling modern web applications across e-commerce, SaaS, AI/ML, and blockchain. I am proficient in Node.js, TypeScript, Java/Spring Boot, React/Next.js, SQL/NoSQL databases, and cloud platforms like AWS and Azure. I excel at designing microservices architectures, integrating LLM-driven AI workflows, and building and operating large-scale systems that handle high data and traffic loads. I bring a strong ownership mindset, lead successful projects, maintain a sharp product focus, actively share knowledge, and nurture a growth mindset in teams.…I am a full-stack software engineer with 7 years of experience designing, building, and scaling modern web applications across e-commerce, SaaS, AI/ML, and blockchain. I am proficient in Node.js, TypeScript, Java/Spring Boot, React/Next.js, SQL/NoSQL databases, and cloud platforms like AWS and Azure. I excel at designing microservices architectures, integrating LLM-driven AI workflows, and building and operating large-scale systems that handle high data and traffic loads. I bring a strong ownership mindset, lead successful projects, maintain a sharp product focus, actively share knowledge, and nurture a growth mindset in teams.

Kristiyan Merdzhov

Full Stack Developer, Web Developer, Back-End Developer, +4

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I am a full-stack software engineer with 7 years of experience designing, building, and scaling modern web applications across e-commerce, SaaS, AI/ML, and blockchain. I am proficient in Node.js, TypeScript, Java/Spring Boot, React/Next.js, SQL/NoSQL databases, and cloud platforms like AWS and Azure. I excel at designing microservices architectures, integrating LLM-driven AI workflows, and building and operating large-scale systems that handle high data and traffic loads. I bring a strong ownership mindset, lead successful projects, maintain a sharp product focus, actively share knowledge, and nurture a growth mindset in teams.…I am a full-stack software engineer with 7 years of experience designing, building, and scaling modern web applications across e-commerce, SaaS, AI/ML, and blockchain. I am proficient in Node.js, TypeScript, Java/Spring Boot, React/Next.js, SQL/NoSQL databases, and cloud platforms like AWS and Azure. I excel at designing microservices architectures, integrating LLM-driven AI workflows, and building and operating large-scale systems that handle high data and traffic loads. I bring a strong ownership mindset, lead successful projects, maintain a sharp product focus, actively share knowledge, and nurture a growth mindset in teams.

Available to hire

I am a full-stack software engineer with 7 years of experience designing, building, and scaling modern web applications across e-commerce, SaaS, AI/ML, and blockchain. I am proficient in Node.js, TypeScript, Java/Spring Boot, React/Next.js, SQL/NoSQL databases, and cloud platforms like AWS and Azure.

I excel at designing microservices architectures, integrating LLM-driven AI workflows, and building and operating large-scale systems that handle high data and traffic loads. I bring a strong ownership mindset, lead successful projects, maintain a sharp product focus, actively share knowledge, and nurture a growth mindset in teams.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

German

Fluent

English

Fluent

Bulgarian

Fluent

Work Experience

Full-Stack Developer at Idealo GmbH

January 1, 2014 - October 28, 2025

Led development of microservices-based architecture; built RESTful APIs in Node.js/Express to process product data and translation pipelines; designed and deployed an internal CMS and message broker to support distributed microservices; led AI workflow features to enhance product data; improved content productivity across the organization. Technologies included Node.js, TypeScript, Nest.js, AWS, Terraform, Kubernetes, Docker, MongoDB, PostgreSQL, Java, Spring Boot, Python, React; CI/CD, Grafana/Loki, Kafka; GrowthBook A/B testing.

Software Developer at Arz.Digital GmbH

July 31, 2023 - July 31, 2023

Implemented end-to-end testing suite using Cypress (TypeScript) and Playwright (C#), integrated tests into Azure CI. Developed new frontend features in Blazor/C#, including a client analytics dashboard. Collaborated with product managers to scope and deliver microservices in .NET Core.

Freelance Software Engineer at Various Clients (Freelance)

October 1, 2023 - October 1, 2023

Designed and built a Spring Boot payment-processor API for an e-commerce startup; developed a Node.js/React order processing platform and integrated AI-powered chatbot features using OpenAI GPT-3/4. Led cross-platform desktop app development with Electron/React for offline AI-powered data insights. Mentored teams on CI/CD, SOLID principles, and clean-code. Built Solana Rust/Anchor smart contracts (SPL Token) and Ethereum Solidity tokens with MetaMask integration; created middleware bridging Web2 and Web3 apps.

Backend Developer at Sirius Analytics EOOD

March 31, 2019 - March 31, 2019

Developed RESTful APIs in Java/Spring Boot for internal data analytics tools; improved query performance via optimized SQL and Redis caching; integrated APIs into React dashboards for real-time data visualization; wrote unit/integration tests and Swagger docs.