Alexander Droßel, Developer in Hamburg, Germany
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Alexander Droßel

Verified Expert  in Engineering

Software Developer

Hamburg, Germany
Toptal Member Since
August 24, 2022

Alexander is an experienced full-stack developer with hands-on experience designing, developing, and implementing scalable and cost-efficient applications and solutions using a broad range of technologies and programming languages. He has worked as the lead software engineer of small teams, building products quickly and efficiently using modern technologies.



Preferred Environment

MacOS, Git, Google Cloud Platform (GCP), Linux, Visual Studio Code (VS Code), Vim Text Editor, i3

The most amazing...

...thing I've done was co-found a startup where I learned how to build products from scratch and manage Agile teams.

Work Experience

Co-founder, CEO, and Full-stack Engineer

2019 - PRESENT
Robin Heat
  • Founded a multi-product startup that created products independently and for clients with a small and agile team.
  • Managed and hired both software engineers and sales persons.
  • Processed 500,000 euros in payments with a complex market platform.
  • Automated organizing of 3,000 events in niche markets.
  • Created serverless setup for rapid prototyping in a small and agile team.
  • Managed multiple products from idea to public launch.
  • Built workflow for both developer and sales process.
Technologies: TypeScript, React, React Native, Python, CI/CD Pipelines, Firebase, Google Cloud Platform (GCP), Amazon Web Services (AWS), Webpack, Node.js, Django, Solidity, Pipelines, Testing, Cypress, Jest, ESLint, Git, Kanban, Agile, Docker

Student Software Developer

2018 - 2019
Fernuniversität Hagen
  • Cretaed and maintained a Java application that connects to a Haskell library written by the research team.
  • Developed new features in close contact with the researchers.
  • Refactored existing code to ensure maintainability and clean code practices.
Technologies: Java, Haskell

MX Tickets
A complex ticketing platform for the motocross market with an integrated payment provider and a focus on automation. Motocross clubs can manage events and different customer roles via the platform. Customers buy tickets from the motocross club.

Built from an idea over MVP to user-centric feature development and set up a tech stack for a small development team and cost-efficient scalability.

Used and integrated different technologies, like Zendesk, Hubspot, Stripe, Sendgrid, Slack notifications, PDF creation, Puppeteer, and ticket generation.

Managed and optimized sales processes, built an offline-compatible React Native app, and created team-specific best practices and coding conventions. Used GitLab Issue board for Agile Kanban software development.

A React Native-based mobile app for both Android and iOS.

It's an interactive map with food trucks around the users providing a list and filtering by food type. Users can log in and manage their food truck with an account and give access to position updates for staff.
A Web3 live messenger for wallet-to-wallet communication.

I encrypted messages directly in the wallet manager and evaluated ideas based on currently available technology. Built knowledge in Blockchain encryption standards and implemented accordingly with given frameworks like Web3.js and Ethers.js.

Stock Options Calculator

Built a product to calculate future trends of given stock options. Developed the back end using Python and Django.js on AWS EC2 instance to leverage given packages for complex stock calculations and the front end with TypeScript React.
2016 - 2019

Master's Degree in Physics

Technical University Dortmund - Dortmund, Germany

2013 - 2016

Bachelor's Degree in Physics

Technical University Dortmund - Dortmund, Germany


React, Stripe, Node.js, NumPy, Web3.js, Puppeteer, Pandas, Matplotlib


SendGrid, GitLab, Git, LaTeX, Vim Text Editor, Webpack, Expo, Adobe Experience Design (XD)


JavaScript, TypeScript, Python, ECMAScript (ES6), C++, Java, Haskell, Solidity


MacOS, Firebase, Visual Studio Code (VS Code), Google Cloud Platform (GCP), Linux, Docker, Zendesk, HubSpot, Blockchain, Amazon Web Services (AWS)


NoSQL, Cloud Firestore


React Native, Cypress, Jest, Django


Testing, Kanban, Agile, Automated Testing, E2E Testing, Management


CI/CD Pipelines, Scientific Data Analysis, Scientific Computing, Pipelines, ESLint, Serverless, Google Cloud Functions, Integration Testing, Neuroscience, Pub/Sub, Ethers.js, Encryption

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