# Ruslan Alekseyev

> Senior Full Stack Developer & Engineering Manager with 13+ years of experience building AI-powered, scalable applications. Based in Barcelona, Spain.

## Key Expertise

- **AI/ML Integration**: Production-ready AI systems using OpenAI API, Claude API, RAG Systems, LangChain, and Vector Databases
- **Technical Leadership**: Engineering management, team scaling, architecture design, and mentoring distributed teams
- **Full-Stack Development**: Node.js, TypeScript, React, Next.js, PostgreSQL, MongoDB, AWS, GCP, Kubernetes

## Services Offered

- **AI/ML Integration Architecture**: Designing and implementing production-ready AI solutions including chatbots, document processing, and intelligent automation
- **Fractional CTO / Technical Leadership**: Part-time technical guidance for startups and growing companies needing senior technical expertise
- **Full-Stack Development**: End-to-end application development with modern tech stacks (Node.js, React, Next.js)

## Pages

- [About](https://ruslan-alekseyev.tech/about): Career timeline, technical skills, and background information
- [Services](https://ruslan-alekseyev.tech/services): Detailed service offerings with engagement models (hourly, retainer, project-based)
- [Portfolio](https://ruslan-alekseyev.tech/portfolio): Case studies including Aspect Health, PayAggregator, and enterprise projects
- [Blog](https://ruslan-alekseyev.tech/blog): Technical articles on AI integration, team leadership, and software architecture
- [Contact](https://ruslan-alekseyev.tech/contact): Direct contact information and scheduling

## Featured Projects

- [Aspect Health Platform](https://ruslan-alekseyev.tech/portfolio): AI-powered healthcare platform - Engineering Manager role (2024-Present)
- [PayAggregator](https://ruslan-alekseyev.tech/portfolio): Payment processing system with ML-based fraud detection (2022-2024)
- [BuySellVouchers](https://ruslan-alekseyev.tech/portfolio): P2P voucher marketplace platform (2020-2022)

## Technical Skills

- **Languages & Frameworks**: JavaScript, TypeScript, Node.js, React, Next.js, Express, NestJS
- **Databases**: PostgreSQL, MongoDB, Redis, MySQL, Elasticsearch
- **Cloud & DevOps**: AWS, GCP, Docker, Kubernetes, Terraform, GitHub Actions
- **AI/ML Tools**: OpenAI API, Claude API, LangChain, Vector Databases, Prompt Engineering

## Writings (Medium)

- [OpenClaw Is Complete Garbage: The Most Useless AI Agent Ever Conceived](https://medium.com/@ruslan.alekseyev/openclaw-is-complete-garbage-the-most-useless-ai-agent-ever-conceived-f58ce005215e) — AI
- [Will AI Replace Developers?](https://medium.com/@ruslan.alekseyev/will-ai-replace-developers-cbbc36c5e9a3) — AI
- [Building Human-in-the-Loop AI Workflows with LangGraph and Persistent State](https://medium.com/@ruslan.alekseyev/building-human-in-the-loop-ai-workflows-with-langgraph-and-persistent-state-79698bf7ba1d) — AI
- [Diving Into the Saga Pattern: The Foundation for Building a Reliable Microservices Architecture](https://medium.com/@ruslan.alekseyev/diving-into-the-saga-pattern-the-foundation-for-building-a-reliable-microservices-architecture-8ed2df871e1e) — Microservices
- [You Must Know This Before Starting Microservices](https://medium.com/@ruslan.alekseyev/you-must-know-this-before-starting-microservices-fd66f478ea13) — Microservices
- [Microservices vs Monolithic Applications: Why the Shift Matters](https://medium.com/@ruslan.alekseyev/microservices-vs-monolithic-applications-why-the-shift-matters-f61fc3505995) — Microservices
- [Code Drives Profit](https://medium.com/@ruslan.alekseyev/code-drives-profit-19ea06aeaa8e) — Engineering
- [Enhancing Docker Security with Strategic Network Segmentation](https://medium.com/@ruslan.alekseyev/enhancing-docker-security-with-strategic-network-segmentation-aa1e4a5304d3) — DevOps
- [The Hidden Cost of Async/Await in Loops: A Real-World Scenario of Surging CPU Usage in Node.js](https://medium.com/@ruslan.alekseyev/the-hidden-cost-of-async-await-in-loops-a-real-world-scenario-of-surging-cpu-usage-in-node-js-095df92c805a) — Node.js

## Social Media

- **LinkedIn**: https://www.linkedin.com/in/full-stack-team-lead
- **GitHub**: https://github.com/ruslanaleks
- **X (Twitter)**: https://x.com/RuslanAlekseyev
- **Medium**: https://medium.com/@ruslan.alekseyev
- **Reddit**: https://www.reddit.com/user/SafeCoat8313/

## Contact

- **Email**: ruslan.alekseyev@gmail.com
- **Location**: Barcelona, Spain (GMT+1)
- **Availability**: Open to consulting and fractional CTO engagements

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Last updated: 2026-03-13