Phillipp Bertram
13+Years Experience

Hi, I'm Phillipp

I believe great software isn't just about code—it's about impact. Technology should solve problems, drive innovation, and create real value.

AWS Certified AI Practitioner (AIF-C01)
AWS Certified Solutions Architect - Associate (SAA-C03)
AWS Certified Cloud Practitioner (CLF-C01)

About Me.

With years of experience as a Software Engineer and CTO, I've built everything from sleek mobile apps to powerful cloud architectures.

My passion? Turning ideas into high-performance software solutions - especially with Flutter for mobile apps, Golang & Node.js for backend magic, and AWS to keep it all running smoothly in the cloud.

I'm passionate about building not just code, but long-term value. Scalable architectures, maintainable solutions, and impactful products - that's what excites me.

My favorite Tech Stack:

  • 🚀 Mobile Apps - Flutter, Swift, Kotlin
  • 🔗 Backend - Golang, Node.js, scalable APIs
  • ☁️ Cloud - AWS (Lambda, API Gateway, RDS & more)
  • 💻 Web - Next.js, React

Great software isn't just about performance - it's about sustainability. I love creating solutions that don't just work today but continue to deliver value in the long run.

  1. Freelancer @self-employed
    Present

    As a freelancer, I am starting on a new chapter in my life, driven by the desire to utilize my experience to help others.

  2. CTO & Supervisory Board member @aerosys

    As the CTO of a pioneering startup developing the world's first digital co-pilot, I oversee the development team, foster a thriving team culture, shape the company's technology vision and make critical tech decisions.

  3. Software Engineer @slashwhy

    Software Engineer in several projects for different sectors.

  4. CTO & Co-Founder @KickOn

    As the CTO of a startup developing a hospitality platform, I oversee the development team, foster a thriving team culture, shape the company's technology vision and make critical tech decisions.

  5. Head of Mobile App Development @LMIS AG

    As Head of Mobile App Development, I lead and inspire a team, oversee team building efforts, and utilize my expertise as a versatile software developer to successfully deliver projects across various sectors, leveraging a wide range of technologies.

  6. Developer & Software Consultant @LMIS AG

My Services

From Concept to Code - Building the Future of Your Product

Mobile Apps

I design and develop innovative and user-friendly mobile apps that don't just look great - they run smoothly, scale effortlessly, and provide an outstanding user experience. With Flutter, I create cross-platform apps that feel truly native on both iOS and Android. Need a fully native solution? No problem - I've got Swift and Kotlin in my toolkit, too.

But a great app is more than just code - it needs a solid architecture, seamless backend integration, and a cloud infrastructure that can scale with your users. That's why I bring my fullstack expertise to the table, ensuring your app isn’t just built, but built to last.

native Apps
Cross-Platform
Flutter
Dart
Swift
SwiftUI
Combine
Rx
Reactive Programming
Concurrency
Kotlin
Coroutines
Firebase
Supabase
REST
GraphQL
Android
iOS
Push Notifications
App Store
Play Store
Analytics
CI/CD
Unit Testing
UI Testing
State Management
Bluetooth Low Energy (BLE)
SQLite
Realm
Drift
Hive
Riverpod

Cloud & Backend

A great app needs a rock-solid backend - fast, scalable, and ready to handle real-world traffic. I design and build cloud-native architectures with AWS, ensuring your backend is not just powerful but also efficient, secure, and cost-effective.

From scalable APIs to event-driven microservices, I prefer to use Golang and Node.js to create scalable, maintainable backend systems that grow with your product. Whether it's serverless with AWS Lambda or a containerized solution, I make sure your infrastructure is built for speed, security, and future scalability.

Amazon Webservices (AWS)
Serverless
Docker
IaC
Go
NodeJS
Typescript
REST
GraphQL
gRPC
tRPC
Express
NestJS
MongoDB
Python
PostgreSQL
MySQL
MongoDB
DynamoDB
Redis
CI/CD
Generative AI
OAuth 2.0
JWT
OpenID Connect
AWS CDK
AWS CloudFormation

Web Apps

Fast, scalable, and modern - that's how websites should be. I build high-performance web applications with Next.js and React, combining speed, SEO optimization, and a smooth user experience. Whether it's a dynamic web app, a landing page, or a fully interactive platform, I create solutions that are both functional and future-proof.

With a focus on clean code, reusability, and performance optimization, I ensure your website is not just beautiful but also fast and easy to maintain. Need backend integration? No worries - I connect your frontend seamlessly with Golang, Node.js, or AWS-powered APIs.

React
Next.js
Typescript
Vue
JAMstack
Webpack
Netlify
CMS
Vercel
Turbo
TailwindCSS
Framer Motion
Redux
GraphQL
REST
Node.js
Jest
Cypress
Storybook
Figma
SEO
Analytics
Performance
Accessibility

Tech Consulting - From Idea to Scalable Solution

Sometimes, you don't need more code - you need the right strategy. With years of experience as a CTO & fullstack engineer, I help companies make smart tech decisions, optimize architectures, and scale their products effectively.

Whether youre planning a new app, improving an existing system, or facing scalability challenges, I bring hands-on expertise in mobile development, backend systems, and cloud infrastructure to guide you towards the best solutions.

Project Management
Technology Strategy
Infrastructure Optimization
Technology Decisions

AI - GenAI, LLMs, and more

I'm passionate about using AI to solve problems and create value. I've worked with GenAI, LLMs, and RAG to build scalable and efficient solutions that enhance productivity and user experiences.

From implementing RAG systems with vector databases to fine-tuning models and building AI-powered chatbots, I help companies leverage the latest AI technologies effectively. My expertise includes working with AWS AI services (e.g.Bedrock), OpenAI's GPT models, and developing custom AI solutions that integrate seamlessly with existing systems.

AWS Bedrock
AWS AI Services
OpenAI
Anthropic
Gemini
Claude
ChatGPT
RAG
GenAI
LLMs
Generative AI
Prompt Engineering
AI Agents
LangChain
Python

What People Say

“I highly recommend Phillipp without reservation - for any position that requires technical understanding, responsibility, and genuine passion for good solutions. Anyone who works with him gets not only results but also someone they can rely on at any time.“
“Phillipp is not only technically strong but also an absolute team player and doer who really drives projects forward! An asset to any project! He thinks ahead, takes responsibility, and always goes the extra mile when needed. Thanks to his dedication, we were able to successfully implement highly relevant and complex features, deliver various app releases, and significantly improve the codebase through refactoring.“
Eike Kottkamp

CEO & Founder·addSensors GmbH

“As a CEO, I particularly appreciate when things just work. Phillipp delivered exactly that: A clean, reliable Flutter app that enables our customers to try out our sensors directly. In a very short time, he had a working solution that delights our customers - and all of this without me having to worry about technical details.“
Waldemar Weißhaar

Senior Android Developer·Freelancer

“Phillipp thinks and acts like a true team player. He listens, actively supports, and shares his knowledge with great dedication. Through his clear communication and patience, he has sustainably developed our team in areas such as architecture, programming, and project work. Both professionally and personally, he was a role model for all of us. I am very grateful to have been part of his team. Anyone who works with Phillipp gains both a true professional and a valuable colleague.“
“I highly recommend Phillipp without reservation - for any position that requires technical understanding, responsibility, and genuine passion for good solutions. Anyone who works with him gets not only results but also someone they can rely on at any time.“
“Phillipp is not only technically strong but also an absolute team player and doer who really drives projects forward! An asset to any project! He thinks ahead, takes responsibility, and always goes the extra mile when needed. Thanks to his dedication, we were able to successfully implement highly relevant and complex features, deliver various app releases, and significantly improve the codebase through refactoring.“
Eike Kottkamp

CEO & Founder·addSensors GmbH

“As a CEO, I particularly appreciate when things just work. Phillipp delivered exactly that: A clean, reliable Flutter app that enables our customers to try out our sensors directly. In a very short time, he had a working solution that delights our customers - and all of this without me having to worry about technical details.“
Waldemar Weißhaar

Senior Android Developer·Freelancer

“Phillipp thinks and acts like a true team player. He listens, actively supports, and shares his knowledge with great dedication. Through his clear communication and patience, he has sustainably developed our team in areas such as architecture, programming, and project work. Both professionally and personally, he was a role model for all of us. I am very grateful to have been part of his team. Anyone who works with Phillipp gains both a true professional and a valuable colleague.“
“I highly recommend Phillipp without reservation - for any position that requires technical understanding, responsibility, and genuine passion for good solutions. Anyone who works with him gets not only results but also someone they can rely on at any time.“
“Phillipp is not only technically strong but also an absolute team player and doer who really drives projects forward! An asset to any project! He thinks ahead, takes responsibility, and always goes the extra mile when needed. Thanks to his dedication, we were able to successfully implement highly relevant and complex features, deliver various app releases, and significantly improve the codebase through refactoring.“
Eike Kottkamp

CEO & Founder·addSensors GmbH

“As a CEO, I particularly appreciate when things just work. Phillipp delivered exactly that: A clean, reliable Flutter app that enables our customers to try out our sensors directly. In a very short time, he had a working solution that delights our customers - and all of this without me having to worry about technical details.“
Waldemar Weißhaar

Senior Android Developer·Freelancer

“Phillipp thinks and acts like a true team player. He listens, actively supports, and shares his knowledge with great dedication. Through his clear communication and patience, he has sustainably developed our team in areas such as architecture, programming, and project work. Both professionally and personally, he was a role model for all of us. I am very grateful to have been part of his team. Anyone who works with Phillipp gains both a true professional and a valuable colleague.“
“I highly recommend Phillipp without reservation - for any position that requires technical understanding, responsibility, and genuine passion for good solutions. Anyone who works with him gets not only results but also someone they can rely on at any time.“
“Phillipp is not only technically strong but also an absolute team player and doer who really drives projects forward! An asset to any project! He thinks ahead, takes responsibility, and always goes the extra mile when needed. Thanks to his dedication, we were able to successfully implement highly relevant and complex features, deliver various app releases, and significantly improve the codebase through refactoring.“
Eike Kottkamp

CEO & Founder·addSensors GmbH

“As a CEO, I particularly appreciate when things just work. Phillipp delivered exactly that: A clean, reliable Flutter app that enables our customers to try out our sensors directly. In a very short time, he had a working solution that delights our customers - and all of this without me having to worry about technical details.“
Waldemar Weißhaar

Senior Android Developer·Freelancer

“Phillipp thinks and acts like a true team player. He listens, actively supports, and shares his knowledge with great dedication. Through his clear communication and patience, he has sustainably developed our team in areas such as architecture, programming, and project work. Both professionally and personally, he was a role model for all of us. I am very grateful to have been part of his team. Anyone who works with Phillipp gains both a true professional and a valuable colleague.“

Ready to Get Started?

Whether you’re launching a startup, scaling a software platform, or need strategic tech consulting – I’m here to help.

I thrive on solving complex challenges and delivering tangible results. Let’s work together to turn your vision into reality.