Freelance Product Engineer · Agentic Engineering

I help product teams build & ship software end-to-end

Full-stack product engineer with expertise in Java, Kotlin, TypeScript, and JavaScript, and 15+ years experience delivering e-commerce systems.

Jonas Tebben

What I bring to your team

Product Mindset

Think in user outcomes and business impact, not just tickets. Own features end-to-end — from problem framing to production.

Team Integration

Seamless remote collaboration. Transparent communication and shared ownership of outcomes.

AI-Amplified Velocity

Agentic workflows shorten feedback loops dramatically. Ship features in days instead of weeks — without compromising on quality.

Quality Code

Clean, maintainable solutions that scale. Development with high test coverage and thoughtful architecture.

Human in the loop · AI in the harness

Agentic Engineering

Generic AI assistants produce generic AI output. I design and operate a personalAI coding harness — specialized subagents, custom skills, slash commands, lifecycle hooks, and project context — so agents understand the system and follow conventions. I stay in the driver's seat: framing problems, reviewing diffs, owning the result. AI leverage, not AI autopilot.

Specialized Subagents

A small fleet of subagents — e.g. reviewer, test-writer, architect, security auditor — each with its own prompt, tools, and permissions. Right specialist for each step; I orchestrate them.

Custom Skills

Project-specific skills bundle expertise and instructions so recurring tasks — release notes, schema migrations, accessibility audits — happen the same way every time.

Slash Commands

Reusable workflows captured as commands so the team gets consistent results without re-prompting each time.

Lifecycle Hooks

Hooks wired into session start, prompt submit, tool use, and stop events enforce policy, run linters and tests, or fire notifications — guardrails the agent can't bypass on my watch.

Context & Settings

CLAUDE.md, AGENTS.md, scoped permissions, and per-repo settings keep the harness predictable, secure, and aligned with your team's standards from day one.

MCP Integrations

Where useful, Model Context Protocol servers connect agents to internal docs, APIs, or tools. Selectively added, never the default — most leverage comes from the harness above.

Full-stack expertise

Backend Architecture

  • Scalable systems build with Java, Kotlin, JavaScript, and/ or TypeScript
  • RESTful & event-driven API design
  • Domain-driven architecture, Moduliths & Microservices
  • Clean, maintainable code structures

Frontend Development

  • Modern component-based frameworks
  • Responsive, accessible user interfaces
  • High-performance web applications
  • Cross-browser compatibility

Cloud & DevOps

  • AWS containerized deployments
  • Automated CI/CD & GitOps workflows
  • Infrastructure as Code management
  • Production monitoring & incident response

Data & Integration

  • SQL & NoSQL database architectures
  • Real-time event streaming systems
  • Third-party service integrations
  • Data modeling & query optimization
20+ Years
Software Engineering Experience
15+ Years
E-Commerce Business Experience
Since 2017
Full-Time Remote Collaboration
Since 2012
Lecturer at IT & Business School

Core technologies

Java
Kotlin
JavaScript
React
Spring
AWS

Ready to ship faster?

Let's talk about how a product engineer with agentic workflows can help your team deliver more — end-to-end, with AI leverage and senior accountability.

Get in touch