Thomas Jansen, Technology Leader and Developer in Einbeck, Lower Saxony, Germany
Thomas Jansen

Technology Leader and Developer in Einbeck, Lower Saxony, Germany

Member since December 4, 2020
Thomas is a technology executive, product leader, and engineer with over a decade of experience. He works as a lead engineer, solution architect, and full-stack developer. Previously, he was head of development tools at SAP and helped to build and scale various international technology startups. Thomas creates exceptional end-user experiences with a strong focus on UX, helps others advance, and continuously expands his technology repertoire.
Thomas is now available for hire




Einbeck, Lower Saxony, Germany



Preferred Environment

Visual Studio Code, OS X, Git

The most amazing...

...project I've worked on was a new time recording application where we could save over €5 million per year with an improved user experience.


  • Engineering Lead and Full-stack Developer

    2022 - 2022
    US Healthcare SaaS (Toptal Projects)
    • Led the engineering for one of the biggest Toptal projects so far.
    • Defined the technology stack for a new medical healthcare SaaS product for the US combining EMR, PM, and medical billing.
    • Led the front-end development using React, TypeScript, and Tailwind CSS and back-end development using Node.js, Express.js, and Apollo.
    • Assisted with effort estimation, roadmap creation, and integration of third-party solutions, as well as their technical evaluation.
    • Supported hiring of new talents, onboarding, and scaling the team.
    Technologies: GraphQL, Node.js, Express.js, Prisma, Apollo Server, React, Create React App, Tailwind CSS, Auth0, Apollo Client, Redux, TypeScript, JavaScript, User Experience (UX), User Interface (UI), HTML, CSS, Apollo, Architecture
  • Full-stack Developer

    2021 - 2021
    Spontaneousli (Toptal)
    • Developed a Slack app to make random ad-hoc video calls with colleagues.
    • Evaluated new product ideas and created prototypes.
    • Supported the app with effort estimations and high-level roadmap creation.
    Technologies: JavaScript, Slack API, Slackbot, Slack App, Node.js, Videos, Glitch, HTML, CSS, Architecture
  • Solution Architect, Team and Infrastructure Lead

    2021 - 2021
    Bitus Labs (2 Toptal Projects)
    • Defined the architecture for two projects to launch a decentralized crypto exchange platform for leveraged trading.
    • Set up the infrastructure on AWS (S3, CloudFront, ECR, ECS, and Aurora) and a CI/CD pipeline using GitHub Actions.
    • Oversaw the technical development of both platforms and coordinated and aligned both development teams.
    • Assisted with effort estimates and internal and external hiring and staffing of developers for the projects.
    Technologies: Amazon Web Services (AWS), React, Tailwind CSS, Blockchain, Amazon Aurora, AWS Elastic Beanstalk, Ethers.js, PostgreSQL, Amazon CloudFront CDN, Amazon S3 (AWS S3), Amazon ECR (Amazon Elastic Container Registry), CI/CD Pipelines, JavaScript, Node.js, Express.js, TypeScript, User Experience (UX), User Interface (UI), HTML, CSS, Architecture, Redux
  • Founder and CTO

    2021 - 2021
    Patent Claim Editor
    • Implemented an Electron-based offline editor to reduce the manual effort for patent attorneys when drafting patent claims.
    • Generated word documents automatically with detection of document changes.
    • Oversaw development, launch, and sales of the new product.
    Technologies: Node.js, Vue, Electron, JavaScript, Express.js, User Experience (UX), User Interface (UI), HTML, CSS, Architecture, Tailwind CSS
  • Co-founder & CTO

    2020 - 2021
    Million Ventures
    • Co-founded a venture builder to create new digital ventures.
    • Advised startups in the developer and productivity tools space.
    • Created a custom eCommerce shop using Shopify and automated fulfillment processes using the Shopify API.
    Technologies: Vuex, Architecture, Technical Leadership, Stripe, API Integration, Shopify API, Shopify, Puppeteer, Firebase, Google Cloud Platform (GCP), SQL, JavaScript, CSS, HTML, Productivity, DevOps, Startups, Electron, Express.js, Vue, Node.js, eCommerce, User Interface (UI)
  • Engineering Manager

    2018 - 2019
    • Improved existing CI/CD services across SAP, including source code management, artifact management, CI/CD infrastructure services, licensing scans, security scans, and quality scans.
    • Managed the developer and quality tools teams responsible for internal services to increase development productivity and fulfill corporate requirements.
    • Defined the overall vision and mission for the department.
    • Hired new employees and supported and coached team members in their personal and professional development.
    Technologies: Docker, APIs, CSS, JavaScript, HTML, NestJS, GraphQL, Microservices Architecture, REST APIs, Full-stack, NoSQL, API Integration, Architecture, Leadership, Continuous Integration (CI), CI/CD Pipelines, API Gateways, API Management, Google Cloud Platform (GCP), AngularJS, Angular, Express.js, MongoDB, Node.js, Project Management, People Management, Product Management, Amazon Web Services (AWS), GitHub API
  • Product Manager

    2012 - 2018
    • Enabled and scaled new development services such as GitHub and Slack for over 20,000 developers.
    • Collaborated with external vendors, performed due diligence, and coordinated between various departments such as legal, security, data protection, and purchasing.
    • Promoted open-source practices for development and released an open-source project to handle contributor license agreements.
    • Managed the product development of internal services, from discovery to delivery and operations.
    • Organized a worldwide training program for Git and GitHub.
    • Selected for outstanding contribution and strategic thinking as part of the company-wide catalyst program.
    Technologies: Microservices Architecture, Technical Leadership, Architecture, Express.js, APIs, NoSQL, Google Cloud Platform (GCP), Passport.js, CSS, HTML, REST APIs, API Integration, JavaScript, Angular, CI/CD Pipelines, Slack API, GitHub, Docker, MongoDB, AngularJS, Node.js, Amazon Web Services (AWS), GitHub API
  • Software Engineer

    2010 - 2012
    • Developed a system to localize defects faster, significantly reducing the time and effort spent on root cause analysis.
    • Published patent EP2960799A1 on the localization of defects in software integration tests.
    • Built an integration to create support tickets from running applications while automatically capturing application runtime information.
    • Was recognized for exceptional contribution and great potential as part of the company-wide talent program.
    Technologies: REST APIs, API Integration, SQL, Full-stack, APIs, CSS, HTML, Defect Management, Patent Applications, ABAP, JavaScript, Algorithms, Agile
  • Software Engineer

    2007 - 2010
    • Implemented data aggregation methods to speed up the processing of financial transactions.
    • Designed and implemented an enhanced versioned storage system for financial transactions.
    • Introduced an automated testing framework for the inbound processing of financial transactions.
    • Supported the writing of new specification documents for the upcoming release of the product.
    • Organized and conducted internal workshops for efficient programming, test-driven development, and Agile development methods.
    Technologies: API Integration, Design Patterns, Data Structures, APIs, Databases, Agile, Test-driven Development (TDD), ABAP


  • Healthcare SaaS

    A healthcare SaaS solution that includes integrations to third-party vendors for tests, prescriptions, payments, etc., in order to simplify the complex billing process used in the US for submitting insurance claims.

  • Spontaneousli

    A Slack app to connect co-workers with other co-workers for on-demand video meetings. Select up to 4-time slots that normally work for you daily and get randomly paired for a video call with a new colleague daily.

  • Patent Claim Editor

    An offline editing application for patent attorneys to efficiently create and amend patent claims. The application automatically updates all claim references while editing. It also manages part names and generates full word documents with proper change tracking.


  • Languages

    JavaScript, ABAP, HTML, CSS, SQL, TypeScript, GraphQL
  • Frameworks

    Express.js, Electron, Tailwind CSS, AngularJS, Angular, Redux, NestJS
  • Libraries/APIs

    Node.js, Vue, Vuex, Slack API, GitHub API, REST APIs, React, Passport.js, WebRTC, Intercom API, Puppeteer, Shopify API, Stripe
  • Tools

    GitHub, Slack, Git, SendGrid, Amazon CloudFront CDN, Amazon ECR (Amazon Elastic Container Registry), Prisma, Create React App, Auth0
  • Paradigms

    Test-driven Development (TDD), Agile, DevOps, Design Patterns, Continuous Integration (CI), Microservices Architecture, HIPAA Compliance
  • Storage

    Database Management Systems (DBMS), MongoDB, NoSQL, Amazon Aurora, PostgreSQL, Amazon S3 (AWS S3)
  • Industry Expertise

    Project Management
  • Other

    Database Theory, Product Management, People Management, CI/CD Pipelines, Algorithms, Data Structures, API Integration, APIs, Full-stack, Architecture, Technical Leadership, Leadership, User Experience (UX), User Interface (UI), Patent Applications, API Management, API Gateways, Defect Management, Startups, BoltJS, eCommerce, Ethers.js, Apollo Server, Apollo Client, Slackbot, Slack App, Videos, Glitch, Healthcare IT, SaaS, Cloud, ICD-10, HIPAA Electronic Data Interchange (EDI), Billing, Apollo
  • Platforms

    Docker, Google Cloud Platform (GCP), Amazon Web Services (AWS), Firebase, Shopify, Heroku, Blockchain, AWS Elastic Beanstalk


  • Master's Degree in Computer Science
    2006 - 2007
    University of Saarland - Saarbrücken, Germany
  • Bachelor's Degree in Computer Science
    2003 - 2006
    University of Saarland - Saarbrücken, Germany


  • Toptal React Accelerator Graduate
    MAY 2022 - PRESENT
    Toptal, LLC

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