Full-Stack Development
Web applications, customer portals and internal tools – from the business requirement to integration with your existing systems.
Freelance · Freiburg, Germany
Software Architect & Full-Stack Engineer
I'm Patrick Schaub. I build new web applications and modernize existing systems without interrupting operations – as an extra engineer on your team, as a technical lead or with full ownership of a defined project.
- Freelance since
- 2016
- Work mode
- Remote & on-site
Services
How I can help
I work on the code, not just on the concept. Depending on the project, the focus is on one of these four areas – often on several.
Cloud & Infrastructure
Ship new versions safely and run your application reliably – with containers, CI/CD and suitable cloud services.
Technical Leadership
Interim tech lead: taking technical responsibility, preparing and documenting decisions – while contributing to the code.
Legacy Modernization
Renew established applications step by step instead of rebuilding what works – without interrupting operations.
References
Selected projects
From Deutsche Bahn to SICK and Chrono24 – a look at selected projects and my role in them.
since 2023
Full-Stack Engineer → Technical Product Owner
Digitaler Befehl
BVU / DB InfraGO
Progressive web app by DB InfraGO and BVU for transmitting written operating orders digitally in rail operations – run in Deutsche Bahn's cloud environment.
My contribution
- Frontend and backend development with React, TypeScript, Kotlin and Quarkus
- As Technical Product Owner: architecture decisions, backlog refinement and sprint planning
- Mentoring and code reviews within the development team
- React
- TypeScript
- Kotlin
- Quarkus
- PostgreSQL
- Docker
2021–2023
Full-Stack Engineer
Web Tooling for Safety Sensors
SICK AG
Web-based configuration and diagnostic tools for industrial safety sensors and robotics – on a reusable foundation for several product and brand variants.
My contribution
- Modeled configuration logic as explicit, testable state machines with XState
- Frontend in Angular, backend services in NestJS
- Data access through TypeORM and PostgreSQL
- Angular
- NestJS
- XState
- TypeScript
12/2018–06/2020
Frontend Engineer
Live Marketplace Frontend Migration
Chrono24
Incremental migration of the frontend from jQuery to Vue.js – while the international luxury watch marketplace kept running.
My contribution
- Built new Vue.js components for existing page areas
- Migrated jQuery-based areas step by step – no big bang
- Coordination within and across several Scrum teams
- Vue.js
- TypeScript
- jQuery
- SCSS
Working together
How we can work together
For a defined project – even without an in-house development team – or as longer-term support within your team. We agree on the right setup together.
For HR and recruiters
Roles, tech stack and project history at a glance – as a freelance profile and as a CV to download.
Code & architecture review
An independent look at code, architecture and delivery – with prioritized risks and concrete next steps.
A defined development package
A new application, a feature, an integration or the modernization of a clearly scoped area – even without an in-house development team.
Interim technical lead
Technical decisions, reviews and support for your team – until the responsibility is back in-house.
An extra engineer on your team
I work alongside your developers on the tasks ahead – with your tools and your processes.
Getting started
- 01
First conversation
You describe the task, the context and your timeframe. Together we clarify whether and how I can help.
- 02
Agree on the setup
We agree on scope, role, type of contract, terms and start date.
- 03
Delivery
I get up to speed, deliver in short increments and align decisions with you and your team.
About me
Software architect from Freiburg
I have worked as a freelance software architect and developer since 2016. In projects, I combine full-stack development with architecture work and technical responsibility – from rail operations and industrial sensors to e-commerce.
I also have a background in running systems – that understanding of operations still shapes how I build software. Alongside client work, I build and run my own tools – so I also know the work that follows the first release.
- since 2023DB InfraGO / BVUDigitaler Befehl – full-stack engineer, then Technical Product Owner
- 2021–2023SICK AGFull-stack engineer – web tooling for safety sensors
- 2020Oetker DigitalFrontend engineer – headless commerce for BELViNi
- 2018–2020Chrono24Frontend engineer – migration from jQuery to Vue.js
- 2016–2017VolkswagenFrontend engineer – Car-Net customer portal in Wolfsburg
Tech stack
My tech stack
My focus is web applications with TypeScript – including backend, data and delivery. The choice depends on your system and your team.
- Frontend
- TypeScript
- React
- Vue.js
- Angular
- JavaScript
- Tailwind CSS
- SCSS
- Backend
- Node.js
- NestJS
- Kotlin
- Quarkus
- Java
- PHP
- Symfony
- Laravel
- Rust
- Go
- Data
- PostgreSQL
- MySQL
- Redis
- SQLite
- TypeORM
- Doctrine
- Cloud & delivery
- Docker
- Kubernetes
- AWS
- Google Cloud
- GitLab CI/CD
- GitHub Actions
- Quality
- Vitest
- Jest
- Cypress
- Selenium
- E2E Testing
- Ways of working
- Scrum
- Kanban
- Product Ownership
- Requirements Engineering
- Mentoring
Contact
Let's talk about your project.
Send me a short note about the task, the technical context and your planned timeframe. I'll get back to you personally.
Patrick Schaub
Software Architect & Full-Stack Engineer
You talk to me directly.