Solo Software Engineer · AI-First

Systems that take a team.
Built by one engineer.

City-scale ride-hailing, AI product-intelligence platforms, OSINT microservices — I design, build, and ship them end-to-end. One person, AI-first, in weeks not years.

Mihai Alexandru
Mihai Alexandru
I build what teams can't — solo, AI-first, in weeks not years.
Work with me Schedule a Briefing

Domains I engineer in

Ride-Hailing / AI & ML Systems / Fintech & Ledgers / Distributed Infrastructure / OSINT

Core Engineering Capabilities

I solve hard computer-science problems for businesses that cannot afford downtime — real-time systems, applied AI, fintech-grade correctness, and the distributed infrastructure to run it all. No generic templates, no team to coordinate; one engineer, pure technical execution, end to end.

High-Concurrency Infrastructure

Real-time geospatial systems with sub-second latency — live driver/rider matching over Redis GEO, demand-aware surge pricing, and WebSocket fleets streaming location to thousands of concurrent clients. The backbone of a production ride-hailing platform serving an entire city without dropping a beat.

AI Systems Integration

Production AI/ML pipelines wired into real products — demand forecasting with calibrated confidence intervals, winner-scoring engines, multi-tier vector memory and RAG, and multi-provider LLM routing with hallucination suppression.

Distributed-Systems Architecture

Event-driven, multi-service platforms engineered for correctness under load — HA Postgres (Patroni · HAProxy · etcd), Redis Sentinel quorums, queue-backed workers, idempotent writes, and fail-closed controls.

Security & Intelligence

Intelligence-grade systems and defense-in-depth. SENTINEL fuses OSINT and multi-source feeds through entity resolution and anomaly & threat detection into one real-time operating picture — the engine behind a live law-enforcement command center. Under every build: tamper-evident audit logs (SHA-256 hash chains + Ed25519 checkpoints), encryption at rest, OTP/JWT auth with rotation, and regulatory compliance (ANAF e-Factura, GDPR) baked in.

Fintech, Payments & Ledgers

Double-entry immutable ledgers with serializable posting, idempotency keys, and reconciliation — multi-gateway card payments (Stripe, NETOPIA), wallets and cashback, plus risk controls and a kill-switch for fail-closed money movement.

Monolith → Microservices

Zero-downtime decomposition of legacy monoliths into resilient, independently deployable services — strangler-fig rollouts, dedicated payments and fraud boundaries, and contract-first APIs so teams ship without stepping on each other.

Full-Stack & Mobile Delivery

End-to-end delivery — Next.js / React web, React Native (Expo) apps, and self-hosted infrastructure on Docker, Kubernetes, and Hetzner with CI/CD, monitoring, and blue-green deploys. One team from architecture to App Store.

What I've built — solo

Selected Work

Every system below was designed, built, and shipped by one person — architecture to production. No team, no agency.

~360K
LOC · FAR
Production ride-hailing — NestJS · PostGIS · Redis
~70K
LOC · SENTINEL
OSINT microservices platform — TypeScript
~235K
LOC · KaiScout
AI product intelligence — FastAPI · Next.js · Gemini
~231K
LOC · Kai
Local-first cognitive AI — FastAPI · RAG/Qdrant · Ollama

KaiScout

Live

AI competitor & product-intelligence SaaS for ecommerce — a winner-scoring engine, demand forecasting with confidence intervals, competitor tracking, and ad/trend intelligence. FastAPI + Next.js, with AI insights on Google Gemini.

FastAPI Next.js Stripe Gemini
kaiscout.com
KaiScout — product intelligence dashboard KaiScout — winner-scoring engine KaiScout — ad intelligence

FAR

Ride-Hailing

A production ride-hailing platform for the city of Constanța — real-time geospatial matching, in-app booking and payments, driver earnings, e-invoicing compliance, and a tamper-evident audit log. NestJS, PostGIS, Redis GEO, Socket.IO, with native React Native apps. ~360K lines of TypeScript — built solo.

NestJS PostGIS Redis GEO React Native
FAR — choose a ride FAR — driver online map FAR — driver earnings

Kai

Privacy-First

A local-first cognitive personal AI that runs on-device — a three-tier vector memory, a live knowledge graph, and a cognitive architecture, with privacy by design. Python, FastAPI, Ollama.

Python Qdrant Ollama On-Device
Kai — memory knowledge graph Kai — telemetry dashboard Kai — chat interface

SENTINEL

OSINT

An OSINT intelligence-fusion platform — event-driven microservices for collection, entity resolution, and anomaly detection, with a real-time geospatial command view, behind an API gateway and plugin host. TypeScript monorepo, Helm/Kubernetes. ~70K lines — built solo.

TypeScript Turborepo Kubernetes Event-Driven
SENTINEL — geospatial intel map SENTINEL — intel feed SENTINEL — live tracking

SENTINEL RTCC

Live Demo

A Real-Time Crime Center built on SENTINEL — fusing live police, fire, and EMS feeds into one tactical command picture: geospatial incident mapping, AI command briefs with threat scoring, apparatus tracking, and unified multi-agency overlays.

Real-Time Fusion Geospatial AI Briefing Multi-Agency
View Live Demo
SENTINEL RTCC — real-time crime center SENTINEL RTCC — unified multi-agency command SENTINEL RTCC — fire & EMS command

Restaurant POS

Point of Sale

A full-service restaurant point-of-sale — PIN-based staff shifts, a live table floor map, service-period menus, real-time order routing to the kitchen, and reporting. React + Vite front of house, Fastify + WebSockets backend. ~15.5K lines — built solo.

React Vite Fastify Socket.IO
Restaurant POS — table floor map Restaurant POS — menu & ordering Restaurant POS — staff dashboard

Start a conversation

Let's engineer
your hardest problem.

Tell me what you're building. I'll respond with how I'd approach it — architecture, scope, and timeline.

Email
mihai@oneeko.ai
Phone
+40 734 978 168
Book a call
30-min architecture briefing

Prefer email? Write us at mihai@oneeko.ai