# Ruslan Alekseyev

> Ruslan Alekseyev is a senior technical partner — a software architect and product engineer — with 13+ years across FinTech, HealthTech, banking, AI, SaaS and marketplaces. He helps founders and software teams design, build and scale software products: architecture + execution. Not just advice, not just code. Based in Barcelona, Spain (GMT+1). Works remotely worldwide.

## Services

- [Product Architecture & MVP Build](https://ruslan-alekseyev.tech/product-architecture-mvp-build): From idea to production-ready MVP — architecture design, backend and full-stack development, DevOps and a technical foundation built to scale.
- [AI-Accelerated Product Engineering](https://ruslan-alekseyev.tech/ai-accelerated-product-engineering): AI-assisted development workflows guided by senior architecture and code review — ship faster without technical chaos.
- [Backend & Microservices Architecture](https://ruslan-alekseyev.tech/backend-microservices-architecture): Backend systems, service boundaries and APIs — modular monolith, microservices or hybrid, chosen to fit the product and stage.
- [AI Production Integration](https://ruslan-alekseyev.tech/ai-production-integration): Turn AI prototypes into reliable production systems — backend architecture, RAG, fallbacks, cost control, monitoring and a real deployment strategy.
- [Technical Architecture Audit](https://ruslan-alekseyev.tech/architecture-audit): A focused audit for teams shipping slower than before — backend, infrastructure, CI/CD and delivery review with a prioritized risk report and a 30/60/90 day roadmap.
- [Fractional CTO / Technical Partner](https://ruslan-alekseyev.tech/fractional-cto): Ongoing senior technical support — architectural direction, delivery discipline and hands-on execution without a full-time CTO hire.
- [Technical Rescue Sprint](https://ruslan-alekseyev.tech/technical-rescue-sprint): A 1–2 week engagement to stabilize critical backend, infrastructure, deployment or architecture problems for teams stuck in firefighting mode.
- [All Services](https://ruslan-alekseyev.tech/services): Overview of all engagements and how to choose between them.

## Case Studies

- [Aspect Health](https://ruslan-alekseyev.tech/work/aspect-health): AI-powered healthcare platform. Engineering Manager (2024–Present). Multi-model AI (GPT-4 + Claude) with RAG, HIPAA-compliant. Results: 10,000+ daily AI-assisted patient interactions, 60% reduction in administrative time, 99.7% uptime with zero HIPAA violations, 40% AI cost reduction, led 30+ developers across 3 time zones.
- [PayAggregator](https://ruslan-alekseyev.tech/work/payaggregator): Multi-tenant payment platform with ML fraud detection. Senior Full Stack Developer (2022–2024). Results: $50M+ monthly transaction volume, 99.95% uptime, 60% fraud loss reduction, sub-100ms API responses (95th percentile), 500+ merchants.
- [Swedbank](https://ruslan-alekseyev.tech/work/swedbank): Digital banking platform for a leading Nordic/Baltic bank. Full Stack Developer (2021–2023). Results: services supporting 7M+ bank customers, 99.99% availability, PSD2-compliant, zero security incidents.
- [Enterprise Banking Platform](https://ruslan-alekseyev.tech/work/enterprise-banking): Fortune 500 banking modernization at Accenture. Full Stack Developer (2018–2020). Results: 1M+ concurrent users, 99.99% uptime (4x improvement), deployment from days to hours, mentored 10+ developers.
- [BuySellVouchers](https://ruslan-alekseyev.tech/work/buysellvouchers): P2P voucher marketplace with crypto and automated escrow. Full Stack Developer (2020–2022). Results: 50,000+ active users in 18 months, 100,000+ transactions, 70% page load reduction, zero security breaches.
- [Tournated](https://ruslan-alekseyev.tech/work/tournated): All-in-one sports management platform. Full Stack Developer (2023–Present). Results: adopted by 50+ sports federations and organizers, thousands of athletes ranked, unified multiple sports on one platform.
- [AI Integration Framework](https://ruslan-alekseyev.tech/work/ai-framework): Open-source TypeScript framework for multi-provider AI. Technical Architect (2023–2024). Results: 45% cost reduction via smart caching, 99.9% reliability with automatic fallbacks, 500+ GitHub stars, used in 10+ production apps.
- [Aurea Suite](https://ruslan-alekseyev.tech/work/aurea-suite): AI-powered productivity suite. Founder / Technical Architect (2024–Present). Provider-agnostic multi-model AI workspace launching 2026.

## Content

- [Blog](https://ruslan-alekseyev.tech/blog): Technical articles on AI integration, software architecture, backend and engineering leadership.
- [Lab](https://ruslan-alekseyev.tech/lab): Experiments and generative/interactive work.

## Key Expertise

- **AI/ML in Production**: OpenAI API, Claude API, RAG systems, LangChain, vector databases, prompt/workflow design, fallbacks, cost control and monitoring for real users.
- **Backend & Architecture**: Node.js, TypeScript, NestJS, Express, microservices, event-driven systems, PostgreSQL, MongoDB, Redis, Elasticsearch, Kafka.
- **DevOps & Infrastructure**: AWS, GCP, Docker, Kubernetes, Terraform, CI/CD, observability and deployment stabilization.
- **Technical Leadership**: Architecture decisions, delivery discipline, engineering process, code review standards, team scaling and mentoring distributed teams.

## Domains

FinTech & payments, HealthTech, banking (PSD2/regulated), AI/SaaS products, marketplaces, SportsTech.

## Writings (Medium)

- [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
- [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: 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

## Rates

- Indicative rate: €40–45 per hour. Most engagements are scoped up front — fixed-price (architecture audit, rescue sprint, MVP / project work) or monthly retainer (fractional CTO / technical partner) — with the exact scope and price agreed on a fit call.

## Contact

- **Email**: ruslan.alekseyev@gmail.com
- **Book a call**: https://calendly.com/ruslan-alekseyev
- **Location**: Barcelona, Spain (GMT+1)
- **Availability**: Open to consulting, fractional CTO and architecture engagements (worldwide, remote).

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Last updated: 2026-06-14