Backend · Full-stack · Available for freelance

I design and ship production microservice platforms.

Freelance engineer based in France. Python, Rust and TypeScript, from a single typed API to a 40-service mesh with realtime, billing and observability built in.

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Microservices shipped solo

~40

Production languages

4

Polyglot stack

Py · Rs · TS · Java

Selected work

What I build

A look at the kind of systems I take responsibility for end to end.

Flagship · Solo build01

LeavePulse - SaaS platform

A ~40-service platform built single-handedly: a typed public BFF over a gRPC service mesh, hybrid RBAC/JWT auth, dual realtime websocket gateways, billing with payment-provider webhooks, and ClickHouse-backed observability.

Rust · Personal-device mesh02

Cursio - one workspace across machines

A LAN-only mesh for trusted personal devices. Input, audio, clipboard, windows, files and USB travel through one encrypted channel, while applications stay on their original host.

Platform engineering03

Multi-language SDK generator

A contract-first toolchain (in Rust) that reads the platform's OpenAPI specs and realtime manifest, builds an intermediate representation, and emits a typed, resource-object SDK for TypeScript, Python and Rust at once - plus a reference of the object graph.

Open-source library04

Service infrastructure toolkit

A public, reusable Python library that every backend service in the platform is built on - the shared layer for observability, gRPC, resilience and caching, so each service ships production-grade plumbing for free.

Published library05

MagicUtils - Minecraft toolkit

A published, multi-platform Java/Kotlin library (300+ source files) with its own Maven repository and docs. The shared foundation other plugins build on - including the LeavePulse agent.

Java · 5 platforms06

LeavePulse server agent

The on-server side of the platform: a multi-platform Minecraft agent (190+ Java files) that streams privacy-aware telemetry and whitelist events to the backend over HTTP and websockets.

Design system07

Token-driven Vue UI kit

The component library this very site is built on: ~40 accessible Vue components, a runtime theme engine that re-skins everything from a JSON token set, built on Tailwind v4, reka-ui and motion-v.

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Stack

Tools I reach for

Backend

Frontend

Systems & infra

Data & realtime

How I can help

Ways to work with me

01

Backend & APIs

FastAPI / Litestar services, gRPC meshes, auth, billing - designed to run in production, not just demos.

02

Bots & automation

Telegram/Discord bots, scrapers, integrations and scripts that take a manual process off your plate.

03

Web & full-stack

Nuxt / Vue / TypeScript front-ends and full-stack features, wired to a backend that holds up.

04

Rescue & review

Audit, debug or finish an existing codebase - Python, Rust or TypeScript.

Contact

Let's talk about your project

Tell me what you need built. I usually reply within a few hours.

[email protected] @theroer github.com/THEROER LinkedIn