Software engineer · Europe

Alexandru Cioc.I build backends, platforms and AI agents.

Mostly Java with Spring Boot and Python, with Next.js on the front end. I was cofounder and CTO of Leyoda, an AI company, from October 2025 to October 2026. I've been paid to write software since 2020.

I'm open to full-time roles and contracts, remote or on site.

See my work

About

I'm Alex.

At Leyoda we built AI that runs on the customer's own hardware. I set the technical direction and built the platform in Java and Spring Boot, every frontend, our own login and identity server, and a CRM with an AI assistant that works through tools, which Claude and Codex could also use over MCP. The models ran on our own machines, Qwen on llama.cpp behind a private LiteLLM gateway.

With a partner I designed and built MetricHost, a game-server hosting platform for a game studio. It's more than ten Spring Boot services and Kafka on Kubernetes in Europe and the US, with Stripe billing, set up with Terraform and Ansible.

I started out writing Java for game server networks in 2020, as lead developer at EndPixel and for Vertmix and Piki Studios. I'm finishing a BSc in Computer Science at Maastricht University, and my thesis, Hesperus, was presented at BNAIC 2026.

Read about MetricHost
Alexandru CiocOpen to roles and contracts

Work.

A platform I built for a client, my thesis, an agent that fixes AWS incidents, and my own open-source tool. Below them are the write-ups and the other repos.

All writing
CustomerGameOperatorControlDataEUUS

Client work

MetricHost

A game-server hosting platform, from a one-page concept to production in two regions.

Spring Boot / Kafka / Kubernetes / EU and US

Read the write-up

Open source

On-call agent for AWS

An AI agent that fixes AWS incidents, bounded by IAM and approved by a person. 10 of 10 in its eval.

AWS / LangGraph / Step Functions / Terraform / IAM

View on GitHub
  1. Field study

    119 open-source repos, scored for coding agents

  2. Benchmark, part two

    When self-hosting a model pays for itself

  3. Benchmark

    Self-hosted and cloud vision models, 1,200 calls compared

  4. Repo

    Leyoda platform

What I work with.

The languages and tools I've used in production, from the bottom of the stack up.

Layer 1 of 4

Infrastructure

Kubernetes clusters in more than one region, set up as code, with zero-downtime deploys and monitoring in Prometheus, Grafana and Loki.

KubernetesDockerTerraformAnsibleHelmCiliumnginxCloudflarePrometheusGrafanaLokiForgejo CI
Layer 2 of 4

Backend

Java 21 with Spring Boot is what I use most, then Python with FastAPI. APIs, auth, billing, event streams and the databases underneath.

JavaSpring BootPythonFastAPITypeScriptNode.jsGoPostgreSQLRedisKafkaMongoDB
Layer 3 of 4

AI

Agents that do their work through tools, LLM integrations, retrieval, and models I host myself.

AI agentsLangGraphLangChainMCPRAGClaude APIOpenAI APIllama.cppvLLMLiteLLMevals
Layer 4 of 4

Frontend

React and Next.js. I built every frontend at Leyoda, and this site.

ReactNext.jsTypeScriptTailwindSEOstructured data

Get in touch.

I'm looking for a full-time role or a contract, remote or on site. Email is the quickest way to reach me.

[email protected]
Status
Open to roles and contracts
Based
Europe, open to relocating