Christoph Johannsdotter - Lead Developer & Architect

Recommended expert

Probsteierhagen, Germany

Experience

Jan 2024 - Present

2 years 1 month

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Energy Provider

Extended the online agent portal using Angular and Nx tools.
Implemented complex state management logic with NgRx.
Expanded the middleware layer (Node.js, Loopback/Express) using TypeScript.

Jan 2023 - Mar 2025

2 years 3 months

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Mobile Network Operator

Modernization: Replaced legacy Java APIs with Nest.js and connected a GraphQL backend via Apollo.
Frontend architecture: Developed full online service modules (Angular, Nrwl Nx) with state management via NgRx.
Mentoring: Provided technical guidance and training to the internal Angular team to improve code quality.

Nov 2019 - Dec 2025

6 years 2 months

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Energy Provider

Fullstack development: Built modules for the customer portal (Angular 15+) and extended the Java backend.
Cloud & security: Implemented a single sign-on (SSO) solution using AWS Cognito/Amplify.
DevOps & QA: Optimized CI/CD pipelines (Azure/AWS), containerized applications with Docker, and introduced automated tests with Cypress.
Consulting: Advised on API design and modernizing IT infrastructure.

Jan 2017 - Jun 2022

5 years 6 months

Lead Developer & Architect

State Agency

Fully designed and redeveloped a REST API and database architecture (PostgreSQL/PostGIS) for a government ordnance detection application.
Responsible for the entire tech stack and data model.

Oct 2016 - Dec 2020

4 years 3 months

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Real Estate Portal

Complex business logic: Designed and developed a search-intensive Angular application with complex filter logic (multiple, interdependent criteria).
Full-stack integration: Optimized performance and enhanced the Laravel (PHP) backend for fast response times on complex search queries.

Jan 2016 - Nov 2019

3 years 11 months

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Mobile Network Operator

Enterprise architecture transformation: Strategic replacement of legacy frontends with a modern Angular architecture.
Introduction of Nx Workspaces (monorepos) and NgRx for scalable state management in large teams.
Security & Identity: Implemented robust security standards by integrating OIDC/OAuth2 for seamless Single Sign-On (SSO) solutions in the frontend.
Fullstack & API Design: Developed high-performance backend modules with NestJS/Node.js and extended and maintained existing Java Spring interfaces.
Design Systems: Built a central, reusable UI component library (SCSS/design system) to standardize UX across multiple applications.
DevOps Culture: Established Docker containers and Kibana logging in the development team and introduced automated end-to-end tests for quality assurance.

Jan 2014 - Dec 2014

1 year

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International Mail Order Company

CI/CD Engineering: Set up and configured a fully automated continuous integration pipeline using Jenkins and Docker.
Quality Assurance: Established strict quality standards (quality gates) through static code analysis, automated testing, and enforcement of code styles.
Process Optimization: Introduced professional versioning workflows (GitFlow/Mercurial) and implemented build hooks for process automation.
Knowledge Transfer: Documented system architecture and provided technical training to internal teams.

Jan 2013 - Dec 2015

3 years

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HD Weather Cam Livestreaming Provider

High-Availability Architecture: Designed and led the development of a highly available camera network and streaming backbone.
Distributed Systems & Orchestration: Developed a fault-tolerant queue management and workload distribution system based on an Apache Mesos cluster and Zookeeper.
Microservices & Polyglot Persistence: Built a microservices landscape using Node.js, Express, and MongoDB.
Media Streaming: Developed specialized modules for Wowza Media Server (Java) to optimize HD content delivery.

Aug 2010 - Jun 2013

2 years 11 months

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Web Agency

Professional software development: Delivered various client projects focused on PHP and JavaScript in an agency environment.
API Development: Designed and implemented REST APIs for external system integrations.
Legacy Refactoring: Modernized and extended existing application landscapes.

Jan 2009 - Jul 2010

1 year 7 months

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Retail Corporation

Lead Development (Intranet): Provided functional and technical leadership in the redevelopment of the company-wide intranet solution.
Digitization of business processes: Replaced manual processes (Excel macros/Access) with modern web-based applications.
Fullstack Modernization: Developed interactive web frontends (jQuery/Ajax) and robust PHP backends to improve process efficiency.

Summary

Senior Angular Developer & Software Architect with over 18 years of experience.

Specialized in building high-performance web applications, scalable state management patterns, and test automation.

Proven expertise in large, complex projects, especially in the energy and telecommunications sectors, as well as in the public sector.

Skills

Frontend Excellence**
Angular (Latest Versions)
Typescript
Rxjs
Signals
Html5/scss
Architecture & Tooling**
Nx Workspaces (Monorepos)
Micro-frontends
Webpack/esbuild
State Management**
Ngrx
Signal Store
Apollo (Graphql)
Redux Pattern
Quality Engineering**
Playwright
Cypress
Jest
Backend & Cloud**
Node.js (Nest.js, Express)
Api Design (Rest & Graphql)
Docker
Ci/cd (Azure/aws)

Languages

German

Native

English

Advanced

Education

Oct 2009 - Jan 2013

FH Kiel

B.Sc. Information Technology & Internet · Information Technology & Internet · Kiel, Germany · 1.8

Aug 2007 - Jan 2010

Bartels-Langness

IT Systems Management Clerk · Kiel, Germany · 1.0

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Rainer Diekmann

Experience

Energy Provider

Mobile Network Operator

Energy Provider

Lead Developer & Architect

State Agency

Real Estate Portal

Mobile Network Operator

International Mail Order Company

HD Weather Cam Livestreaming Provider

Web Agency

Retail Corporation

Summary

Skills

Languages

Education

FH Kiel

B.Sc. Information Technology & Internet · Information Technology & Internet · Kiel, Germany · 1.8

Bartels-Langness

IT Systems Management Clerk · Kiel, Germany · 1.0

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