04.08.2026 aktualisiert

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Full-Stack AI Generalist | Developer | Agile Coach & Scrum Master

Ober-Mörlen, Deutschland
Weltweit
Information Electronics Technician (IHK); SUN Certified Java Developer; Design Sprint Facilitator
Ober-Mörlen, Deutschland
Weltweit
Information Electronics Technician (IHK); SUN Certified Java Developer; Design Sprint Facilitator

Profilanlagen

Frank_Juestel_CV_EN.pdf
Frank_Juestel_Lebenslauf_DE.pdf

Über mich

I wrote my first program in C64 BASIC in 1981 — out of curiosity, not necessity. The curiosity stayed; the tools changed radically. Today I build the tools other developers use to work with AI. Good software is still made by teams, not by lone experts.

Skills

Clean ArchitectureScrum MasterProduct OwnerFlutterClean CodeAgile FührungKünstliche IntelligenzAndroid Application DevelopmentAtlassian JiraCliIos SdkPythonObjective-CScrumRequirements EngineeringTypeScriptCertified Scrum MasterTest-Driven DevelopmentReact.jsSpring BootIos FrameworksSwift (Programmiersprache)Google FirebaseGitLabKotlinGit FlowFull Stack EntwicklungDartReact Native
Senior AI Software Engineer, Full-Stack Engineer and Scrum Master with 35 years of professional software development experience. Today I focus on AI-assisted software engineering: I do not only use LLMs, I build the tools other developers work with. Co-creator of makerOS, an open-source development environment for AI-assisted professional software engineering (Flutter/Dart on macOS/Apple Silicon), integrating Claude Code CLI, Codex, Grok, openCode, vibe/Mistral and Antigravity, with an agent/skill architecture for development, story planning, security and market validation, a custom speech-to-text engine, whiteboard and kanban board.

AI engineering: LLM integration and orchestration, agent-based workflows, AI-assisted development, tool/skill architectures, prompt design, structured workflows, speech to text, introduction of AI-supported systems in enterprise environments.

Frontend: React, TypeScript, JavaScript, Redux, Flutter, Dart, React Native, Swift, SwiftUI, Objective-C, HTML, CSS.

Backend and services: Java (EE, EJB, Servlets, Spring Boot), Kotlin, Python, C, C++, REST APIs, JSON, XML, XSL, web services, client-server architectures, microservice and SaaS backends.

Cloud, DevOps and infrastructure: Google Cloud Platform, Firebase, Terraform, Helm, CI/CD (GitLab CI, FastLane, Xcode Bots), Git, GitFlow, GitLab, Bitbucket, Jira, Linux, macOS, Unix (AIX, Solaris), Windows.

Quality assurance and test automation: Test Driven Development, unit, integration and end-to-end testing, XCTest, XCUITest, JUnit, Espresso, Appium, Mockito, automated testing in CI/CD pipelines, Clean Code, Clean Architecture.

Databases: Oracle, MySQL, DB2, Informix, Progress, CoreData, LDAP.

Agile: Scrum Master and Design Sprint Facilitator, Product Owner experience, Scrum, Scrumban, requirements engineering, user stories, acceptance criteria, backlog management, coaching and training of cross-functional teams.

Industry experience: energy and utilities (Syna), banking and finance (Deutsche Bank, Deutsche Boerse EUREX/XETRA, Commerzbank, DIT, Basel II, SOX), automotive (Porsche), media and streaming (ProSiebenSat.1, maxdome), enterprise software (SAP), manufacturing and heating (Viessmann), consumer goods (Nestle), shipbuilding, insurance distribution.

Selected background: co-founder and CTO of Operational Risk Enterprise Inc., New York; co-founder and vice president of the International Java Club together with IBM, Sun and Symantec; author of iOS and Swift video trainings for Video2Brain and Lynda.com, distributed in retail by Addison-Wesley; trainer, coach and speaker for over 25 years.

Languages: German (native), English (business fluent). Available remote (on site on request).

Erfahrung

Berufserfahrungmehr als 10 Jahre
Freelancer seit1994

Sprachen

DeutschMutterspracheEnglischverhandlungssicher

Projekthistorie

Product Development / AI Engineering

Frank Jüstel / Christian Saur

Internet und Informationstechnologie

Development of makerOS together with Christian Saur: a tool for building professional software with AI support. The product is live and freely available on GitHub.
The application is written in Flutter and Dart, runs on Apple Silicon under macOS and connects several AI backends: Claude Code CLI, Codex, Grok, openCode, vibe (Mistral) and Antigravity. It is complemented by a custom speech-to-text engine, a whiteboard and a kanban board.
At the core of the system are numerous buddies, that is agents or skills, covering development, story planning, security, market validation and further tasks. A community on skool.com and an extensive video series on my own YouTube channel accompany the product.
Technologies: Flutter, Dart, macOS on Apple Silicon, LLM integration, agent-based workflows, speech to text, GitHub.

Scrum Master / Coaching / App and Backend Development

Syna GmbH

Energie, Wasser und Umwelt

Support for the conversion of an SAP UI5 application into a Flutter app running on iPhone and iPad, in the browser and as a standalone Windows application.
As an active member of an interdisciplinary team, accompanied and shared responsibility for the introduction of an AI-assisted system for cross-departmental customer information.
Technologies: Flutter, Dart, Java, Kotlin, Spring Boot, Python, Google Cloud Platform, Terraform, Helm, REST, GitLab.

Scrum Master / Coaching / iOS and Android App Development

Syna GmbH

Energie, Wasser und Umwelt

Development of an application for capturing meter readings via video stream, displaying payment and consumption history and handling contracts.
Technologies: Flutter, Dart, Firebase, CI/CD, REST, GitLab.

Scrum Master / Coaching / Web Development

Syna GmbH

Energie, Wasser und Umwelt

Implementation of an application portal for feed-in systems.
Technologies: ReactJS, TypeScript, Firebase, CI/CD, XCTest, GitLab.

Coaching / Web Development

Syna GmbH

Energie, Wasser und Umwelt

Planning, development and commissioning of a grid connection portal.
Technologies: ReactJS, TypeScript, Firebase, CI/CD, Scrum, GitLab.

Scrum Master / Coaching / App Development

ProSiebenSat.1

Medien und Verlage

Migrated or rebuilt several key components of live streaming apps from Objective-C and Swift to React Native.
Technologies: React Native, iOS, Flutter, JavaScript, TypeScript, Swift, Objective-C, CI/CD, XCUITest, XCTest, Git.

Scrum Master / Coaching / App Development / Design Sprints

Porsche Digital GmbH

Automobil und Fahrzeugbau

Developed an app on behalf of Porsche Digital GmbH, presented at the LA Motor Show accompanying the launch of the new 911 and the Taycan.
Technologies: React Native, Redux, Flutter, iOS, JavaScript, Swift, Objective-C, CI/CD, REST, Git.

Scrum Master / Coaching / App Development

ProSiebenSat.1 / maxdome

Medien und Verlage

As a developer for maxdome I was commissioned to redesign a video streaming app for iPad and iPhone. The project covered both the streaming of protected content and downloads for later offline availability.
Technologies: iOS, Swift, Objective-C, continuous integration (Xcode Bots, FastLane), JSON, client-server, DRM, AVFoundation, PromiseKit, Alamofire, Scrum, Git, GitFlow, Jira, Bitbucket, REST.

Trainer / YouTube Live Stream

JSM Arts IT Consulting GbR

Internet und Informationstechnologie

A 24-hour live stream event introducing all aspects of Swift 2 in detail to a wide audience.
Technologies: Xcode 7, Swift 2, iOS.

Trainer / YouTube Live Stream

JSM Arts IT Consulting GbR

Internet und Informationstechnologie

A 70-part training series on app development with WatchKit connectivity.
Technologies: Xcode 7, Swift 2, WatchKit, CoreData, Apple Watch, iOS.

Coaching / App Development

Viessmann

Industrie und Maschinenbau

Tasks included the strategic direction regarding mobile platforms for customers, employees and consultants as well as the development of concrete app projects up to market maturity and their placement in the App Store. I also migrated existing apps from Objective-C to Swift and added new Swift-based features.
Technologies: iOS, Swift, Objective-C, CoreData, XML, JSON, client-server, CoreGraphics, Git.

App Development

JSM Arts IT Consulting GbR

Industrie und Maschinenbau

Development of a CAN bus control system for two large passenger ships approved for more than 200 people, which can also be operated from an iPad via secure communication. On the iOS side various technologies such as native sockets and concepts for their reliability were implemented.
Technologies: iOS, Swift, Objective-C, CoreData, JSON, client-server, CoreGraphics, CAN bus.

Trainer / Coach / App Development

JSM Arts IT Consulting GbR

Internet und Informationstechnologie

Delivery of numerous seminars and training courses in training rooms and as webinars.
Organisation and launch of FutureTalk, the first live coding show on the internet: participants ask questions and I build a matching sample app live. Organisation and delivery of the long iOS CodingNight with more than 100 participants.
Recording of further video trainings for Video2Brain: Swift crash course, Swift basics, the great Objective-C training as well as CoreData for iOS developers, iOS for developers, MapKit and SpriteKit.
Technologies: iOS, Swift, Objective-C, Xcode, CoreData, CoreGraphics, MapKit, WebKit, CocoaTouch, XML, JSON, client-server communication, NSFoundation, Git.

Coaching / App Development

SBE Software-Buero Ebert

Internet und Informationstechnologie

In close cooperation with the management an app was developed that complements a long-established multi-user solution for driving school administration with the mobile capabilities of iPad and iPhone. The driving school assistant was completely rebuilt as an app and connected to the existing client-server solution through various web services. Decentralised data storage on the iOS devices, a signature module with navigation and location identification of the next learner drivers, encrypted data transmission and protection of the signature data for the legally required tamper protection were implemented.
Technologies: iOS, Objective-C, CoreData, XML, JSON, ZipStreams, client-server, CoreGraphics.

Trainer / Coach / App Development

JSM Arts IT Consulting GbR

Internet und Informationstechnologie

Organisation and delivery of the iOS camping seminar: an iOS 7 seminar at a five-star campsite on Lake Constance, combining working, learning, tools and methods with family and work-life balance.
Technologies: iOS, Objective-C, CoreGraphics, MapKit, CocoaTouch, SpriteKit, CoreData.

Coaching / App Development

SAP

Internet und Informationstechnologie

Involved in the Center of Excellence as the developer responsible for the iOS implementation of the TwoGo app. The aim of the app was to set up carpools in order to save CO2 and relieve the environment through shared commuting. In principle an Uber app, but limited to employees of large companies.
Technologies: iOS, Objective-C, CoreData, CoreGraphics, MapKit, WebKit, CocoaTouch.

Trainer / Coach / App Development

JSM Arts IT Consulting GbR

Internet und Informationstechnologie

A top-class iOS training programme with six participants at the Swiss Diamond Hotel on Lake Lugano, Switzerland. Five days of intensive coaching plus individual training.
Technologies: iOS, Objective-C, CoreData, CoreGraphics, MapKit, WebKit, CocoaTouch.

App Development

Nestle

Konsumgüter und Handel

Reverse engineering of Thomy BBQ, an existing app with no access to the source code. Addition of new features such as online weather, recipes, nominations and golden rules.
Technologies: iOS, Objective-C, OS X.

Coaching / App Development

Glanzlichter Agentur

Marketing, PR und Design

As part of an intensive coaching engagement lasting several weeks, several apps aimed at professional photographers were created for the Glanzlichter agency. They range from a posing guide for working with professional models to a multi-part course on portrait and animal photography.
Technologies: iOS, Objective-C.

Coaching / App Development

Zimmermann und Partner

Internet und Informationstechnologie

Several apps were created as part of individual training sessions lasting several days: from a project based on radionics to an acupuncture database and a special solution for managing extensive audio podcasts with the ability to set audio marks, which behave like bookmarks in an e-book.
Technologies: iOS, Objective-C, CoreData, network, JSON, XML.

Author / Trainer / App Development

Video2Brain

Medien und Verlage

In cooperation with Video2Brain in Graz several video training courses on iOS-based app development were produced. On behalf of Pearson Education and Addison-Wesley these videos were marketed both online and through bookshops throughout Germany, Austria and Switzerland.
Technologies: iOS, Objective-C, iCloud, CoreData, Quartz, MapKit, OS X.

Coaching / App Development

Dynagroup GmbH

Marketing, PR und Design

Development of the Admeno app. The current position is used to calculate distances to advertising partners whose offers are displayed. The app communicates with a DynaGroup server via JSON to determine the list of available offers.
Technologies: iOS, Objective-C, network, JSON, XML, OS X.

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