Tobias Arweiler, Developer in Bous, Saarland, Germany
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Tobias Arweiler

Verified Expert  in Engineering

Communication Developer

Bous, Saarland, Germany
Toptal Member Since
January 27, 2022

Tobias is a UX software developer focusing on user-friendly front-end projects. His favorite UI framework is React, and is also highly experienced with Angular and Vue.js. Tobias loves developing back-end services in Node.js, using Express and He has built production software for clients in various industries, including pharmaceutical, medical, marketing, manufacturing, and energy. He enjoys leading junior developers and keeping projects on track with frequent communication.


Ice Bear Labs
React, Redux, Express.js, MariaDB, PostgreSQL, Docker, Docker Compose...
Ergosign GmbH
JavaScript, React, Angular, Redux, Redux-Saga, GitLab, Docker... GmbH
JavaScript, Vue, Node.js, PostgreSQL, MongoDB, HTML, CSS, Babel, React, Webpack...




Preferred Environment

Visual Studio Code (VS Code), Git, GitLab, React, Redux, Next.js, SCSS, Node.js, Prisma

The most amazing...

...project I created was a webshop for distributing medical devices for B2C and B2B with a multi-level partner system.

Work Experience


2021 - PRESENT
Ice Bear Labs
  • Developed a SaaS product for authors and journalists.
  • Orchestrated a good user experience and a fast front-end and back-end environment by integrating various external tools.
  • Assisted with marketing, startup culture, pitching for investors, social media management, and automated CI processes.
Technologies: React, Redux, Express.js, MariaDB, PostgreSQL, Docker, Docker Compose, GitLab CI/CD, GitLab, Prisma, Sequelize

Senior UX Software Engineer

2018 - 2022
Ergosign GmbH
  • Developed an ERP cloud solution for a German ERP solutions expert.
  • Built a prototype of an online learning platform for students and teachers.
  • Created and maintained an AWS ApiGateway, Lambda, and Cognito stack, landing page, customer portal, and CMS customization for an electricity provider.
  • Developed a machine control dashboard for a health care manufacturer.
  • Built a machine analysis platform for an industry manufacturer.
  • Created a cryptocurrency-connected energy consumption monitor for a German car company.
  • Developed doctor's office software to support care after hospital visits.
  • Communicated throughout all projects with UX designers, project management and product owners (internally and customers) to get the application done.
Technologies: JavaScript, React, Angular, Redux, Redux-Saga, GitLab, Docker, Amazon Web Services (AWS), Agile, User Experience (UX), UX Design, UI Design, Responsive UI, Sass

Software Engineer

2016 - 2018 GmbH
  • Created a webshop for distributing medical devices for B2C and B2B with the integration of a multi-level partner system.
  • Designed and developed a web application for the visualization of sales data for a German supermarket chain.
  • Designed and developed a web application to visualize single market performance compared to others for a German supermarket chain.
  • Built an order management application for an energy supply distributor.
  • Designed and developed a dashboard web application for visualizing detailed user data for an American startup.
Technologies: JavaScript, Vue, Node.js, PostgreSQL, MongoDB, HTML, CSS, Babel, React, Webpack, Express.js, D3.js, DC.js, Highcharts, Git, Docker

Junior Software Engineer

2011 - 2016
ZWF Digitale Informationstechnologie GmbH
  • Developed a mid-scale customs software to manage the registering of shipments with the German customs office and all subprocesses involved.
  • Created the Infor ERP Solutions Infor ERP LN, Baan 4, and Baan 5. Most of the work pertained to the Infor Sales & Distribution module.
  • Developed a custom module for German customs in Infor Baan and Infor LN and then refactored this to a new application in Java.
Technologies: Java, Enterprise Resource Planning (ERP), BaaN, Infor LN, Hibernate, Microsoft SQL Server, Oracle, IBM Informix, PostgreSQL

Draftical - A SaaS Product for Authors
Planning a story takes a lot of work and time. Draftical gives you the tools to create your first draft scene by scene, all safely secured in the cloud.

Draftical is a React front-end, Node.js (Express) back-end web app providing scene-based story drafting for authors. The app is Dockerized and hosted with the use of Docker Compose. It also includes a connected Stripe account to process users' payments and subscriptions.

ERP Cloud Solution for a German ERP Solutions Expert

Together with the customer's development team, my team and I created a complete relaunch and overhaul of an old ERP solution. I was the main architect of the front end and communicated a lot with the client's team, our developers, and the designers responsible for the project.

I also communicate frequently with the client's management team to discuss meeting deadlines and how the project was moving forward.

The front end was a complex React app, using Redux and Redux-Saga for state management and communicating with the back end. The client had developed a complex metadata structure on the back end to tell the front end what it should show on render. We fetched the data efficiently and displayed all the business insights as wished.

Landing Page and Customer Portal for a German Energy Provider

AWS Rest, Lambda, and Cognito stack, landing page, customer portal, and CMS customization for an electricity provider.

I was the technical lead, communicating with our agencies' designers and client product owner to develop the app. I architected the front-end stack and set up and developed a complex AWS stack using Cognito, API Gateway, DynamoDB, and Lambda functions to talk to a third-party system providing the energy tariff and order process data and endpoints.

Visualization of Sales Data for a German Supermarket Chain

In this project, as the sole developer, I built a simple front end for a German supermarket chain to compare their sales regions. We obtained a day's worth of sales data to show their respective regions to test the system. The client could see how sales went for each region and adjust their marketing efforts to maximize profits accordingly.

The app was completed in React, using Leaflet.js to render a map of the client's sales regions. Using a communicated color system, I showed how markets performed and where optimization would make sense for the customer.
2014 - 2016

Master's Degree in Applied Computer Science

Hochschule für Technik und Wirtschaft des Saarlandes (HTW) - Saarbrücken, Germany

2011 - 2014

Bachelor's Degree in Business Computer Science

ASW Berufsakademie Saar - Saarland, Germany


Instructor's License for IT Apprentice Training

IHK Saarland


Base Certificate in Project Management

GPM Deutsche Gesellschaft für Projektmanagement


React, Node.js, Vue, D3.js, DC.js, Highcharts, Redux-Saga, Leaflet


Git, GitLab, Prisma, Babel, Webpack, Docker Compose, GitLab CI/CD, Sequelize, Amazon Cognito


Redux, Express.js, Next.js, JSF, AngularJS, Hibernate, Angular


SCSS, CSS, JavaScript, HTML, TypeScript, Java, Sass


PostgreSQL, Microsoft SQL Server, IBM Informix, MongoDB, MariaDB


Database Development, Agile, UX Design, UI Design, Database Design, REST, Modular CSS


Visual Studio Code (VS Code), Oracle, Docker, Amazon Web Services (AWS), AWS Lambda


User Experience (UX), Architecture, Communication, Process Management, Fetch API, Computer Science, IT Project Management, Data Visualization, Discrete Mathematics, Enterprise Resource Planning (ERP), BaaN, Infor LN, Responsive UI, Training, Government Performance Management (GPM)

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