# Jo Mändle

> I join product teams for the hard parts of the frontend, whatever the framework, and I build LLM features that make it past the demo. Freelance contract engineering with product teams and engineering leads.

**Short mandates now · Ongoing work from Q1 2027.** Short, time-boxed mandates such as an audit or an architecture review can start at short notice. Ongoing work inside a team does not start before that quarter.

Contact:
- Email: business@jomaendle.com
- Book a call: https://calendar.app.google/jpSRhy2ekZWZEv3W7
- LinkedIn: https://www.linkedin.com/in/johannes-maendle/
- GitHub: https://github.com/jomaendle

## For businesses (hire me)

- [Freelance Frontend & AI Engineering (DE)](https://www.jomaendle.com/business): German page describing services, stack, selected client work and how an engagement starts.
- [Freelance Frontend & AI Engineering (EN)](https://www.jomaendle.com/business/en): English version of the same page.
- [Markdown version (EN)](https://www.jomaendle.com/business/en.md): the full page as plain markdown.

## Separate offer: AI impact audit

A self-contained four-week mandate, priced and scoped on its own page. The licences are paid for, the usage is unclear, and in the next budget round someone will ask for numbers. In four weeks I measure what actually changed and what didn't. Measured at team and repository level, with no per-developer analysis.

- [Measuring AI in engineering (EN)](https://www.jomaendle.com/ai-impact): scope, the four weeks, deliverables, price and FAQ.
- [KI im Engineering messen (DE)](https://www.jomaendle.com/ki-wirkung): German version of the same page.
- [Markdown version (EN)](https://www.jomaendle.com/ai-impact.md): the full page as plain markdown.

## Core services

- **Embedded contract engineering**: I work inside your team. Sprints, reviews, shared ownership, same as anyone else on it.
- **AI-native development in your team**: Spec first, agents write the code, checked in the PR against tests, types and lint. I set that up inside your codebase, with project rules and guardrails, and show your team where AI carries the work and where it slows it down.
- **AI & LLM product integration**: From the first feasibility question to a shipped feature: context design, evaluation, guardrails, cost.
- **Frontend architecture & performance**: Rendering strategy, caching, Core Web Vitals, WCAG accessibility. Decisions that still hold up two years out.
- **Modernization & migration**: Replacing a legacy frontend piece by piece, Angular to React included, without pausing the product. Covered by tests in Jest, Vitest, Playwright and Cypress.

## Stack

- **Frontend**: React, Next.js, Angular, Vue, Astro, TypeScript
- **Backend**: Node.js, NestJS, API design
- **AI**: Claude Code, OpenAI Codex, MCP, LLM integration, AI-native SDLC

I don't arrive with a framework preference. I work in whatever you already run.

## Selected client work

- [ImmoKäpsele](https://immokaepsele.de): 2024 – present · Sole developer & tech lead. Complete rebuild as sole engineer: Next.js architecture, Flowfact CRM integration, and an LLM-backed content pipeline that drafts and publishes blog articles through Claude Code and a purpose-built MCP server.
- [Emerge Tech · EasyEngage](https://emerge-tech.io/): 2024 – present · Lead frontend developer. Building EasyEngage, an Astro platform rendering bespoke customer funnels per tenant. Focus areas: multi-tenant routing, short build times, and an editor workflow that lets the product team ship funnels without engineering involvement.
- [Memberspot](https://www.memberspot.de): Aug 2024 – Dec 2025 · Freelance frontend engineer. Frontend engineering on a B2B SaaS platform for course hosting and internal training.

## Background

- Currently: Principal Solution Architect at E.ON Digital Technology
- Previously: Memberspot, StudySmarter, Micro Focus
- Six-plus years of TypeScript in production, in Angular as much as React and Next.js
- Languages: German (native), English (fluent)

## Personal site

- [Homepage](https://www.jomaendle.com): Who I am, selected work, work history, and articles.
- [Blog](https://www.jomaendle.com/blog): Notes on building for the web, lately with Claude Code.

## Legal

- [Impressum](https://www.jomaendle.com/impressum)
- [Datenschutzerklärung](https://www.jomaendle.com/datenschutz)